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1
Kakhramanov, Nadzgaf T., Junis N. Gahramanly, Rena V. Kurbanova, and Reyhan S. Gadzhiyeva. "STUDY OF SORPTION PROCESS OF OIL AND OIL PRODUCTS WITH FOAM POLYMER SORBENTS BASED ON HIGH-IMPACT POLYSTYRENE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, no. 6 (July 19, 2017): 83. http://dx.doi.org/10.6060/tcct.2017606.5583.
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Research results of influence of volume mass of crosslinked and foamed sorbents on the basis of secondary high-impact polystyrene with bitumen and zinc stearate upon their sorption capacity are represented. The mechano-chemical synthesis of foamed polymeric sorbents was carried out on the extruder with a three zone material cylinder. Azodicarbonamide was used as foaming agent and dicumyl peroxide was used as crosslinking agent. Foam polymer sorbents have a high buoyancy and hydrophobicity. This circumstance contributes to increasing the selectivity of sorption process of oil and oil products from water surface. The sorption capacity was determined by gravimetric method according to difference between sorbent weights before and after sorption. It was shown that petroleum are better sorbed on foamed polymeric sorbents with low volume weight and greater diameter of closed-celled structures. In the same time the diesel fuel sorbed well on sorbents with relatively high volume weight and accordingly lesser diameter of pores and cells. Petroleum oils are most effectively sorbed on foamed polymeric sorbents which volume weight and cells diameter are interim in comparison with sorbents for sorption of petroleum and diesel fuel. It was determined that rate of sorption processes increases with rising of temperature of aqueous medium independently on pores and cells diameter. In this case changing in sorption capacity occurs according to certain regularity depending on sorbate type, volume weight of sorbent and medium temperature. It was shown that obtained sorbents are characterized by capability to multiple regeneration at keeping of high buoyancy, hydrophobicity and sorption capacity on petroleum and oil products. Forcitation:Kakhramanov N.T., Gahramanly J.N., Kurbanova R.V., Gadzhiyeva R.Sh. Study of sorption process of oil and oil products with foam polymer sorbents based on high-impact polystyrene. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 6. P. 83-88.
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Badora, Aleksandra. "Polymeric Forms of Al13and Silicon Compounds as Unconventional Binding Agents for some Toxic Metals in Soils." Mineralogia 47, no. 1-4 (December 1, 2016): 29–37. http://dx.doi.org/10.1515/mipo-2017-0006.
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Abstract Own studies and literature data allowed for the evaluation of sorbents in view of the general verification criteria, which are necessary for any sorbent to be applied with no harm to the environment. Polymeric forms of Al13and Si compounds are examples of mineral sorbents that influence metals' toxicity in the environment.
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Kakhramanov, Najaf T., Nushaba B. Arzumanova, Junis N. Gahramanly, and Reyhan S. Gadjieva. "SORPTION OF HEAVY METALS BY MULTICOMPONENT FOAM POLYMER SORBENTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 5 (May 21, 2019): 110–17. http://dx.doi.org/10.6060/ivkkt.20196205.5769.
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The article is dedicated to the investigation of the sorption of heavy metals from water bodies by foam polymer sorbents obtained on the basis of multicomponent polymer mixtures. The need for such studies was dictated by the fact that the more diverse the content of functional or polar groups became in the composition of the foam polymer sorbent, the greater was the probability of increasing the efficiency of sorption of heavy metals. Biocomponent polymer mixtures based on polyamide + polyurethane and three-component mixtures polyamide + polyurethane + acrylonitrile-butadiene-styrene copolymer were used as polymer matrix of the foam polymer sorbents at various ratios. Depending on the chemical nature and the ratio of the initial components in the macromolecules of polyurethane, polyamide and acrylonitrile-butadiene-styrene copolymer, in addition to urethane groups, functional groups such as ether–, ester, amide, urea, and also aliphatic and nitrile groups are also present. The investigation results of the kinetic regularities of heavy metals sorption under polymer components different ratios and ambient temperature are presented. It is established that the foam polymer sorbent consists of pores and cells with a membrane structure, which allows using it for effective sorption of polar and nonpolar compounds. The concentration of sorbed heavy metals was determined by UV-spectroscopic analysis. It is shown that the presence of a system of pores and cells allows the sorbate to diffuse into its more deeply located regions, as a result of which sorption occurs throughout the volume of the sorbent. Essentially, the foam polymer sorbents sorb the molecules by dissolving them on the surface of their membranes. A large variety of adsorption centers on the surface and in the bulk of the foam polymer causes a whole complex of sorbent-sorbate interactions, among which the Van der Waals interactions, dispersion interactions, electrostatic interactions and hydrogen bonds are the main ones.
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Vaisman, Ya I., I. S. Glushankova, L. V. Rudakova, A. A. Surkov, and A. S. Atanova. "Criteria for the Selection of Synthetic Polymeric Waste as a Raw Material for Producing Carbon Sorbents with Predetermined Properties." Ecology and Industry of Russia 24, no. 10 (October 14, 2020): 13–19. http://dx.doi.org/10.18412/1816-0395-2020-10-13-19.
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The results of studies on the thermal processing of synthetic multi-tonnage polymeric waste (polypropylene, polycarbonate, textolite, PET, organoplastics and tire rubber) with the production of carbon sorbents for technological and environmental purposes are presented. The influence of the nature of the activating agent and the conditions of the process with the production of sorbents with predetermined properties was studied. Analysis of the research results allowed us to establish that the main factors affecting the yield of carbonizate and the formation of a porous structure of carbon sorbents from synthetic polymer waste are the degree of aromaticity and the location of benzene rings in the polymer structure, the proportion of oxygen in the precursor. The criteria for selecting synthetic polymer wastes as raw materials for obtaining carbon sorbents with predetermined properties are established. The results of the research can be used in the development of technologies for obtaining carbon sorbents with predetermined properties from waste synthetic polymers and the selection of technological parameters for processes.
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Chalker, Justin M., Maximilian Mann, Max J. H. Worthington, and Louisa J. Esdaile. "Polymers Made by Inverse Vulcanization for Use as Mercury Sorbents." Organic Materials 03, no. 02 (April 2021): 362–73. http://dx.doi.org/10.1055/a-1502-2611.
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Inverse vulcanization is a process in which highly abundant and low-cost elemental sulfur is copolymerized with an unsaturated organic molecule such as a polyene. This process has provided a variety of useful materials with high sulfur content—typically 50% or greater in sulfur by mass. These materials have garnered increasing interest in research as sorbents for mercury, due to the high affinity of sulfur for mercury. In this review, the features of mercury sorbents made by inverse vulcanization are presented. Additionally, case studies are provided to illustrate the variety of polymer architectures accessible with this chemistry, the versatility of these materials in mercury remediation, and prospects for industrial use.1 Introduction2 Sulfur Polymers by Inverse Vulcanization3 Sulfur Polymers as Mercury Sorbents4 Increasing Surface Area to Improve Mercury Uptake5 Crosslinker Considerations6 Sorption of Different Forms of Mercury7 Life-Cycle Management8 Conclusions and Outlook
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Egorin, Andrei, Eduard Tokar, Anastasia Kalashnikova, Tatiana Sokolnitskaya, Ivan Tkachenko, Anna Matskevich, Evgeny Filatov, and Larisa Zemskova. "Synthesis and Sorption Properties towards Sr-90 of Composite Sorbents Based on Magnetite and Hematite." Materials 13, no. 5 (March 6, 2020): 1189. http://dx.doi.org/10.3390/ma13051189.
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The article describes the synthesis of composite sorbents by immobilizing iron oxide in a polymer matrix with subsequent hydrothermal treatment at a temperature of 175 °C. The sorbents based on magnetite and hematite were synthesized, their magnetic properties and phase composition were evaluated, and the iron content was determined. Sorption characteristics of the composites towards microconcentrations of Sr-90 radionuclide in solutions with different mineralization and pH were investigated. It was shown that the sorbent based on magnetite was the most efficient. In alkaline media with pH above 11, the composite sorbent based on magnetite exhibited increased selectivity towards Sr-90 and proved to be suitable for application under dynamic sorption conditions with subsequent desorption of the radionuclide with a solution of HNO3.
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DORSKAIA, Elena V., Yuri A. LEYKIN, Sergei M. PESTOV, and Aleksei E. KOVALENKO. "EXTRACTION OF LIPID PROFILE COMPONENTS FROM PLASMA BY VARIOUS FORMS OF POLYMERIC SORBENTS WITH THE AMMONIUM AND PHOSPHONIUM BASE GROUPS." Periódico Tchê Química 16, no. 31 (January 20, 2019): 595–606. http://dx.doi.org/10.52571/ptq.v16.n31.2020.602_periodico31_pgs_595_606.pdf.
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Cardiovascular diseases are the leading causes of death globally. The purpose of the article is to reveal the forms of anion exchangers with groups of ammonium and phosphoniumbases, which are the most promising for selective extraction of low- and very-low-density lipoprotein cholesterol (LDL and VLDL), their increased content beinga risk factor of circulatory system diseases. This research is of practical importance considering insufficient selectivity and side effects of commercial sorbents. The main method applied is a screening of a number of sorbents by sorption parameters of lipid profile components to reveal optimum samples for LDL and VLDL removal. We carried out a comparative analysis of sorption characteristics by the components of lipid profile for anion exchangers with groups of onium bases (ammonium and phosphonium) in three forms: hydroxyl, chloride, and bicarbonate. Sorbent capacity for lipid profile components (up to 5.65 μmol/g by LDL and VLDL), as well as sorption efficiency factors, were found (LDL and VLDL selectivity coefficient was up to 6.06). The ability of sorbents to influence plasma atherogenicity was characterized. The most promising forms of anion exchangers for the selective sorption of lipids were defined: in general, these were OH-forms. A sorbent with ammonium base groups has higher sorption capacity, and a sorbent with phosphonium base groups has a higher selectivity for atherogenic LDL and VLDL. The data of the article may be useful in the development and practical application of sorption columns for selective removal of LDL and VLDL cholesterol with minimal side effects.
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Hroboňová, Katarína, Andrea Špačková, and Martina Ondáková. "Application of solid-phase extraction for isolation of coumarins from wine samples." Nova Biotechnologica et Chimica 18, no. 1 (June 1, 2019): 37–43. http://dx.doi.org/10.2478/nbec-2019-0005.
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Abstract Coumarins can be as a result wine storage and aging in wood drums and they can affect organoleptic characteristics of wine. The aim of this work was to determine the content of coumarins in wine samples originated from Slovak Tokaj wine region. The HPLC method with high specificity, accuracy, precision, and recovery was proposed. SPE sorbents of C18 type, styrene-divinylbenzene copolymer and molecularly imprinted polymers were compared for extraction of six coumarins, coumarin, aesculin, scoparone, scopoletin, 4-methylumbelliferone, and herniarin. Higher recoveries (above 89 %; except aesculin – recoveries higher from 68 %, RSDs less than 6 %) were obtained with selective polymeric sorbent laboratory prepared by molecularly imprinted technology. The results showed that content of coumarins in wine samples are in ng.mL−1 concentration levels and depend on the age and wine puttony.
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Hummel, Darius, Andreas Fath, Thilo Hofmann, and Thorsten Hüffer. "Additives and polymer composition influence the interaction of microplastics with xenobiotics." Environmental Chemistry 18, no. 3 (2021): 101. http://dx.doi.org/10.1071/en21030.
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Environmental contextThe effects of the presence of polymer additives and polymeric structure on sorption of xenobiotics to microplastics remain unclear. Our results combined data from experimental sorption batch experiments using three environmentally relevant model sorbates with confocal microscopy. This provides clear evidence that both factors play a major role in sorption strength and the underlying sorption process, affecting sorption onto the particle surface and partitioning into the bulk polymer. AbstractMicroplastics are particulate contaminants of global concern. Interactions of microplastics with organic contaminants are frequently studied with commercially available polymer materials as surrogates. The influence of the polymer structure (i.e. internal 3D polymer geometry and monomer chain length) and the presence of additives on their interactions with xenobiotics remains unclear. This work investigates sorption of three sorbates of environmental concern to two polyamide (PA) and two polyvinyl chloride (PVC) sorbents of different molecular composition and additive content, respectively. Sorption was studied using complementary data from sorption isotherms and confocal laser-scanning microscopy. The additives in PVC increased sorption affinity owing to an increased sorbent hydrophobicity and a higher void volume within the polymer. Surface area normalisation indicated surface adsorption for unplasticised PVC and absorption for 1,2-cyclohexane dicarboxylic acid diisononyl ester (DINCH)-plasticised PVC, which were confirmed using confocal laser-scanning microscopy. The strong sorption to PA was mainly driven by hydrogen-bond interactions. The contribution depended on the molecular features of the sorbent and the sorbate. Confocal laser-scanning microscopy showed that PA6 was taking up more sorbate into its bulk polymer matrix than PA12, the two being different in their chemical composition. This difference could be attributed to the higher swelling capability of PA6. The results emphasise that the molecular structure of the polymer and the presence of additives have to be taken into consideration when sorption of organic substances to plastics is investigated.
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Zyablov, Alexander N., Svetlana A. Khalzova, and Vladimir F. Selemenev. "SORPTION OF RED FOOD COLORING POLYMERS WITH MOLECULAR IMPRINTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, no. 7 (August 24, 2017): 42. http://dx.doi.org/10.6060/tcct.2017607.5595.
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Polymers with molecular imprints are used as modifiers of the surface of piezoelectric sensors, so it is necessary to study their sorption properties. Isotherms of sorption of synthetic dyes with polymers with molecular imprint and their comparison polymers are obtained. The type of sorption isotherm is characteristic for polymeric materials with micro- and mesopores. The maximum sorption capacity of polymers in relation to dyes is determined, the areas of the projection of the dye molecules on the surface of the sorbent are estimated. With the sorption of multiply charged anionic dye particles, the surface of the sorbent acquires a partial negative charge, which makes it difficult to sorbate as the surface concentration of the sorbate increases. The efficiency of sorption of azo dyes by polymers with molecular imprint from aqueous solutions depends on the amount of ionized sulfo groups in the azo dye molecule, their location in the benzene ring, the symmetry of the dye molecule. Sorption of azo dye by polymers with molecular prints is mainly due to the formation of hydrogen bonds between the sulphonic group of the dye and the hydroxyl group of the sorbent. The area of the projections of molecules on the surface of the modified polymer for all the dyes does not exceed the calculated values of the areas of the molecules, which indicates a loose filling of the sorbent surface and it is probable that the orientation of the dye molecules in the adsorption layer is close to perpendicular to the surface of the sorbent. The values of extraction rates and distribution coefficients are determined, the imprinting factor is calculated. The highest imprinting factor was obtained for the azo dye Ponso 4R. It has been established that polymers with molecular imprinting based on polyimide have better sorption ability with respect to target molecules than their comparison polymers.Forcitation:Zyablov A.N., Khalzova S.A., Selemenev V.F. Sorption of red food coloring polymers with molecular imprints. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 42-47.
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Bondarev, A. V., and E. T. Zhilyakova. "USE OF SORPTION PROCESSES IN THE TECHNOLOGY OF DRUG DELIVERY SYSTEMS." Pharmacy & Pharmacology 7, no. 1 (March 12, 2019): 4–12. http://dx.doi.org/10.19163/2307-9266-2019-7-1-4-12.
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The aimof this research is the review of scientific and technical literature regarding possibility of using sorption processes in the technology of drug delivery systems.Materials and methods. The materials are the following electronic resources: eLIBRARY, CyberLeninka, PubMed. The methods of review are analysis and synthesis. The study covers the scientific literature from 1996 up to the present time.Results.Sorbents are used as carriers for various medicinal peroral substances, they are also dispensers of various compounds in the form of polymeric eye films and stents in the human body. The delivery of medicinal substances occurs with the help of sorption processes of mass transfer. Currently, the following medical substances are used as carriers for medicinal substances: activated carbon, mineral sorbents (medical clays, synthetic sorbents), polymers and their biosimilars. 6 groups of pharmaceutical substances are registered for the production of enterosorbents in Russia and they can be used as sorbent carriers in the sorption drug system. They are: activated carbon, colloidal silicon dioxide, polyvinylpyrrolidone, dioctahedral smectite, polymethylsiloxane polyhydrate. As a result of the study, the model of the sorption drug system has been developed. It consists of sorbent carrier, active pharmaceutical ingredient and excipients that provide the desorption. Desorption of the active pharmaceutical ingredient may contribute to its modified release. The technology for obtaining sorption medicinal systems requires further study and development of modeling methods, searching for experimental pharmacological models and technological methods, which make it possible to obtain sorption dosage form with modified release.Conclusion.The review of the sorption processes used in the technology of drug delivery systems has been carried out. The model of the sorption drug system has been developed.
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Li, Zhan Chao, Hong Tao Fan, and Ting Sun. "Application of Imprinted Functionalized Silica Gel Sorbent for Selective Removal of Cadmium (II) from Industial Wastewaters." Advanced Materials Research 213 (February 2011): 441–44. http://dx.doi.org/10.4028/www.scientific.net/amr.213.441.
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This study investigated the application of an ion imprinted polymer (IIP) with (3-mercaptopropyl) trimethoxysilane (MPS) functionalized the surface of silica gel as a potential sorbent (IIP- MPS/SiO2) for the selective removal and recovery of Cd2+ from industrial wastewaters. IIP- MPS/SiO2 was prepared by a sol–gel method and characterized by IR. Batch studies were performed to evaluate the adsorption process and it was found that the sorbents were found to adsorb selectively Cd2+ in the presence of Co2+, Ni2+, Zn2+ and Cu2+ interferences in the same medium. IIP-MPS/SiO2 sorbent show the selectivity order under competitive conditions: Cd2+ > Co2+ > Ni2+ > Zn2+ > Cu2+. The removal rate of IIP- MPS/SiO2 sorbent for Cd2+ was about 80 % from synthetic wastewater and mine wastewater spiked with 10, 20 and 50 mg•L-1 Cd2+. This work proved that can IIP-MPS/SiO2 sorbent be used as an efficient adsorbent material for selective removal of Cd2+ from wastewaters.
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Oborina, E. N., A. M. Nalibayeva, V. G. Fedoseeva, I. A. Ushakov, I. B. Rozentsveig, and S. N. Adamovich. "Synthesis, Sorption and Metallochromy Properties of Organosilicon Derivatives of 1-Acetylguanidine." Bulletin of the South Ural State University series "Chemistry" 13, no. 1 (2021): 78–87. http://dx.doi.org/10.14529/chem210108.
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Increased interest in carbofunctional organosilicon monomers (silanes) and polymers (silsesquioxanes) is associated with the fact that these compounds are promising reagents and building blocks, materials for micro-electronics, agriculture and medicine, complexones, catalysts, and efficient sorbents. Thus, functional polysilsesquioxanes surpass mineral and organic sorbents in sorption properties. Moreover, they have the highest chemical and thermal stability. Along with sorption activity carbofunctional organosilicon compounds of both monomeric and polymeric structures can possess metallochromic properties. All this paves the way for the large-scale development of analytical systems for the creation of new complex test methods for the determination, concentration and separation of metals from solutions. In the present study the functional monomer N-[3-(triethoxysilyl)propyl]acetylguanidine 1 was synthesized by the condensation reaction of 1-acetylguanidine and 3-triethoxysilyl-propylamine. Poly-N-[3-silsesquioxanyl) propyl]acetylguanidine 2 was obtained by hydrolytic polycondensation of compound 1. The composition and structure of compounds 1 and 2 were confirmed by IR and 1H NMR spectroscopy, as well as by elemental analysis. Polymer 2 was studied as a sorbent for ions of heavy metals, such as Hg (II), and noble metals Ag (I), Au (III), Rh (II), Pd (II), Pt (IV) from solutions of their salts in hydrochloric or nitric acid. For polymer 2, the values of static sorption capacities have been calculated. The latter depend on the nature of the metal and have values from 78 mg/g (for platinum) to 366 mg/g for rhodium. The graphs of the degree of metal extraction depending on the sorption time and acid concentration have been plotted. A sorption mechanism is proposed, which is realized due to the chelate interaction of the metal cation (M+) with the amide groups of compounds 1 and 2. The interaction of monomer 1, in the form of indicator paper, and polymer 2, in the powder form, with salts of the studied metals is accompanied by intense specific coloration (metallochromy). Color tables of the samples after their contact with the Ag (I), Au (III), Pd (II), Pt (IV), Rh (III), Hg (II) salts are given.
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Qureshi, Muhammad, Guenther Stecher, Christian Huck, and Guenther Bonn. "Preparation of polymer based sorbents for solid phase extraction of polyphenolic compounds." Open Chemistry 9, no. 2 (April 1, 2011): 206–12. http://dx.doi.org/10.2478/s11532-011-0006-x.
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AbstractThis article discusses the preparation of different polymeric sorbents for solid phase extraction. Various monomers like acrylamide, methacrylic acid and 4-vinylpyridine (VP), cross-linkers such as divinylbenzene (DVB) and ethyleneglycoldimethacrylate (EDMA), porogens like tetrahydrofuran (THF) and dimethylsulphoxide (DMSO) / acetonitrile (ACN) with different ratios were investigated in order to optimize recoveries. Resulting polymers were characterized through scanning electron microscope (SEM) and compared with Oasis HLB (Waters, MA, USA) and Strata-X (Phenomenex, Torrance, USA) on the basis of extraction performance, recovery efficiency and loading capacity. Sample applied was a mixture of flavonoid standards (rutin, myricetin, luteolin, quercetin, apigenin and kaempferol). HPLC hyphenated with PDA was used for the analysis of samples. Results showed that among the prepared SPE materials, 4-VP-co-EDMA produced best results. Comparison of the produced polymers with of Oasis HLB and Strata-X resulted in comparable efficiencies; especially the polymer 4-VP-co-EDMA gave almost similar results for all analytes to those of commercially available SPE materials. A general trend of decrease in retention efficiency with increase in polarity has been observed in both synthesized and already available SPE materials. The newly synthesized polymeric materials can be employed as SPE sorbents for efficient extraction of polyphenolic compounds especially for flavonoid aglycons.
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Hasanova, M. B., F. N. Bahmanova, F. M. Chiragov, and C. I. Mirzai. "DETERMINATION OF VANADIUM (V) TRACE AMOUNTS IN OIL SLUDGE AFTER PRELIMINARY CONCENTRATION WITH POLYMER SORBENT." Chemical Problems 19, no. 1 (2021): 18–24. http://dx.doi.org/10.32737/2221-8688-2021-1-18-24.
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A modified sorbent based on copolymer of maleic anhydride with methacrylic acid was proposed for sorption of vanadium (V) concentration. A polymer chelating sorbent with fragments of para-amino salicylic acid was used in the work. Optimal sorption conditions were determined and the dependence of sorption capacity on the acidity of the solution studied. At pH 5, the degree of sorption attains its maximum. The effect of ionic strength on vanadium sorption was studied. Studies have shown that the ionic strength up to 0.6 mol/l does not affect the sorption, after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. The effect of ionic strength on vanadium sorption was studied to show that the ionic strength up to 0.6 mol/l does not affect the sorption, and after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. All further experiments were carried out in the solutions with an ionic strength of 0.6. It was found that as the concentration of vanadium rises in the solution, the amount of sorbed metal increases, and at a concentration of 8.10-3 mol/l it becomes maximum (pH = 5, CV5+ = 8.10-3 mol/l, vtotal = 20 ml, msorb. = 0.03 g, SC = 243 mg/g). The isotherm of vanadium (V) sorption with the synthesized sorbent was constructed. Sorption equilibrium is achieved within 1 hour of contact between the solution and the sorbent. Further growth in the sorption time does not change sorbent’s characteristics. The sorbent extracts vanadium (V) from solutions with a recovery rate of 93%. The effect of different mineral acids (HClO4, H2SO4, HNO3, HCl) of identical concentrations on vanadium (V) desorption from the sorbent was also studied. The results of the analysis showed that the maximum desorption of vanadium (V) occurs in perchlorate acid. The developed method was applied to determine the trace amounts of vanadium in oil sludge with preliminary concentration.
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Dawidowicz, Andrzej L., Dorota Wianowska, Stanislaw Pikus, Elżbieta Kobylas, and Stanislaw Radkiewicz. "Ion Capacity of Siliceous Sorbents with Surface Polymer Layers Composed of Different Dextran—Triethylenetetraamine Mixtures (Ion Capacity of Sorbents with Surface Polymer Layers)." Adsorption Science & Technology 16, no. 4 (April 1998): 263–71. http://dx.doi.org/10.1177/026361749801600403.
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The formation of a polymer layer on the surface of a siliceous support employed for chromatography is one of the methods available for protecting the silica skeleton from dissolution in the mobile alkaline phase and for eliminating the negative influence of silanol groups on separated molecules. A polysaccharide-polyimine copolymer can play the role of the surface layer, especially in siliceous materials, for high performance affinity chromatography. The results presented here demonstrate the utility of the material with such a copolymer layer as a sorbent for metal ions. The ion capacity of sorbents with a copolymer layer composed of triethylenetetraamine-dextran can be changed both by the composition of the mixture and by the amount of crosslinking agent present. The presence of a transition layer on the polymer layer surface explains the distinctions between the ion capacity of sorbents and the concentration of electron-donor nitrogen atoms existing in the material.
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Domracheva, V. A., V. V. Trusova, and D. E. Ostapchuk. "Purification of Waste Water from Petroleum Products with the Use of Combined Sorbents." Ecology and Industry of Russia 24, no. 9 (September 1, 2020): 11–15. http://dx.doi.org/10.18412/1816-0395-2020-9-11-15.
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The results of the study on the purification of model water from petroleum products with the concentration of 15 to 100 mg/dm3 with the use of polyethylene foam (PE foam) and polypropylene foam (PP foam) polymer chips a well as the carbon ABZ sorbent as sorbents were presented. The sorption process was carried out under dynamic conditions. The model waters were purified with PE foam and PP foam polymer chips, the purification efficiency was up to 91%. To increase the purification efficiency of model waters from petroleum products, the model solutions were purified from petroleum products through a combined loading - PE foam chips and ABZ sorbent. It is shown that the use of a combined loading allows to reduce the concentration of petroleum products in waste water to standard values. The results of chromatography - mass spectrometric analysis confirm the high efficiency of waste water purification from petroleum products.
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Álvarez-Suárez, Alan Saúl, Syed G. Dastager, Nina Bogdanchikova, Daniel Grande, Alexey Pestryakov, Juan Carlos García-Ramos, Graciela Lizeth Pérez-González, et al. "Electrospun Fibers and Sorbents as a Possible Basis for Effective Composite Wound Dressings." Micromachines 11, no. 4 (April 22, 2020): 441. http://dx.doi.org/10.3390/mi11040441.
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Skin burns and ulcers are considered hard-to-heal wounds due to their high infection risk. For this reason, designing new options for wound dressings is a growing need. The objective of this work is to investigate the properties of poly (ε-caprolactone)/poly (vinyl-pyrrolidone) (PCL/PVP) microfibers produced via electrospinning along with sorbents loaded with Argovit™ silver nanoparticles (Ag-Si/Al2O3) as constituent components for composite wound dressings. The physicochemical properties of the fibers and sorbents were characterized using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The mechanical properties of the fibers were also evaluated. The results of this work showed that the tested fibrous scaffolds have melting temperatures suitable for wound dressings design (58–60 °C). In addition, they demonstrated to be stable even after seven days in physiological solution, showing no macroscopic damage due to PVP release at the microscopic scale. Pelletized sorbents with the higher particle size demonstrated to have the best water uptake capabilities. Both, fibers and sorbents showed antimicrobial activity against Gram-negative bacteria Pseudomona aeruginosa and Escherichia coli, Gram-positive Staphylococcus aureus and the fungus Candida albicans. The best physicochemical properties were obtained with a scaffold produced with a PCL/PVP ratio of 85:15, this polymeric scaffold demonstrated the most antimicrobial activity without affecting the cell viability of human fibroblast. Pelletized Ag/Si-Al2O3-3 sorbent possessed the best water uptake capability and the higher antimicrobial activity, over time between all the sorbents tested. The combination of PCL/PVP 85:15 microfibers with the chosen Ag/Si-Al2O3-3 sorbent will be used in the following work for creation of wound dressings possessing exudate retention, biocompatibility and antimicrobial activity.
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España Orozco, Sebastian, Philipp Zeitlinger, Karin Fackler, Robert H. Bischof, and Antje Potthast. "A solid-phase extraction method that eliminates matrix effects of complex pulp mill effluents for the analysis of lipophilic wood extractives." Nordic Pulp & Paper Research Journal 35, no. 4 (November 18, 2020): 577–88. http://dx.doi.org/10.1515/npprj-2020-0039.
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AbstractThe extraction of lipophilic wood extractives from pulp and paper process waters proves to be a challenging task, due to harsh and alternating process and sample conditions. This study has determined the potential use of polymeric sorbents for solid-phase extraction (SPE) and compared to classical silica-based reversed-phase packed columns, with polymeric hydrophilic-lipophilic balanced (HLB) cartridges being the sorbent with the most potential. Recovery functions were obtained with an internal standard mixture representative for the main lipophilic wood extractive groups, which are fatty acids and alcohols, sterols, sterol esters and triglycerides. The impact of pH, sample volume and sample matrix, expressed as TOC and cations, on the retention behavior of lipophilic extractives during SPE of industrial samples were determined with polymeric HLB sorbent. High variations in the composition of pulp mill matrices led to different optimal extraction conditions. Thus, a new SPE protocol was developed, which bypasses matrix interferences and omits the loss of analytes due to sample preparation. The method is applicable to different pulp mill effluents with large discrepancies in pH and sample matrices, resulting in recoveries >90 % with RSD <5 % for all lipophilic wood extractives.
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Alabbad, Eman A. "Efficient Removal of Methyl Orange from Wastewater by Polymeric Chitosan-iso-vanillin." Open Chemistry Journal 7, no. 1 (July 3, 2020): 16–25. http://dx.doi.org/10.2174/1874842202007010016.
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Introduction: Water pollution is a serious issue in several countries. In addition, because of limited water resources, the recycling of wastewater is crucial. Consequently, new and effective sorbents are required to reduce the cost of wastewater treatment as well as to mitigate the health problems caused by water pollution. Methods: In this study, the removal of Methyl Orange (MO) dye from wastewater using a chitosan-iso-vanillin polymer was evaluated. The removal of MO from an aqueous solution was studied in a batch system, using the modified chitosan polymer. Results: The results indicate that the removal of MO by the modified chitosan was affected by the solution pH, sorbent dosage, initial MO concentration, contact time, and temperature. The experimental data were fitted to the Langmuir, Freundlich, and Temkin isotherms, and Freundlich isotherm showed the best fit. The kinetic data were fitted to the pseudo-first-order and pseudo-second-order rate equations. Thus, the removal of MO was controlled via chemisorption, and the removal rate was 97.9% after 3 h at an initial MO concentration of 100 ppm and a sorbent dose of 0.05 g. The adsorption behavior of the modified chitosan for the removal of MO was well-described using the pseudo-second-order kinetic model. Intraparticle diffusion analysis was also conducted, and the thermodynamic properties, including entropy (∆S), enthalpy (∆H), and free energy (∆G), were determined. Conclusion: The pH, initial MO concentration, sorbent dosage, adsorption temperature, and contact time had a significant effect on the adsorption of MO by chitosan-iso-vanillin.
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Filipowiak, Kinga, Patrycja Dudzińska, Karolina Wieszczycka, Tomasz Buchwald, Marek Nowicki, Aneta Lewandowska, and Agnieszka Marcinkowska. "Novel Polymer Sorbents with Imprinted Task-Specific Ionic Liquids for Metal Removal." Materials 14, no. 17 (September 2, 2021): 5008. http://dx.doi.org/10.3390/ma14175008.
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In this paper, the potential of novel polymer sorbents with the imprinted IL-functional group for the removal of Cu(II), Cd(II), and Zn(II) from aqueous solutions was investigated by batch mode. The sorbents were fabricated by direct reaction of the prepared polymer matrix (poly(vinylbenzyl chloride-divinylbenzene), VBC, and poly(vinylbenzyl bromide-divinylbenzene), VBBr) with 1-(3- or 4-pyridyl)undecan-1-one and oxime of 1-(3- or 4-pyridyl)undecan-1-one. The Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy (Raman), Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), and Scanning Electron Microscopy (SEM) techniques were used to show functionality and stability of the sorbents. The materials were also characterized by contact-angle goniometry, X-rayphotoelectron spectroscopy (XPS), and Zeta potential analysis. The removal of Cd(II), Cu(II), and Zn(II) was monitored and optimized under the influence of several operational controlling conditions and factors such as pH, shaking time, temperature, initial metal ions concentration, and counter-ions at the functional group. The results obtained confirmed the very high potential of the sorbents; however, the properties depend on the structure of the functional group. The tested sorbents showed fast kinetics, significant capacity at 25 °C (84 mg/g for the Zn(II) sorption with VBC-Ox4.10, 63 mg/g for the Cd(II) sorption with VBBr-Ox3.10, and 69 mg/g for the Cu(II) sorption with VBC-K3.10), and temperature dependence (even 100% increase in capacity values at 45 °C). The selected sorbent can be regenerated without a significant decrease in the metal removal efficiency.
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Alnaqbi, Mohamed A., Afra G. Al Blooshi, and Yaser E. Greish. "Polyethylene and Polyvinyl Chloride-Blended Polystyrene Nanofibrous Sorbents and Their Application in the Removal of Various Oil Spills." Advances in Polymer Technology 2020 (April 8, 2020): 1–12. http://dx.doi.org/10.1155/2020/4097520.
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Polymers provide a wide range of properties, and these properties can be greatly enhanced and modified through polymer blending. Polymer blending combines the properties and advantages of their original polymers. This paper showcases hydrophobic polymers prepared through polymer blending; these blends are characterized and evaluated for their efficiency in the removal of crude oil spills from aqueous media. The application of these blends holds a great deal of importance in preserving the environment and the recovery of lost oil in spills. The blends are produced using polystyrene (PS) as the matrix polymer and individually blending poly(vinyl chloride) (PVC) and polyethylene (PE) with the PS consisting of proportions of 5–20 wt.% each. The blends are then electrospun into bead-free microfibers with interconnected porosities as shown by their respective scanned electron micrographs. All fibrous sorbents showed a high affinity towards the removal of crude oil, motor oil, and diesel spills. The highly viscous motor spill showed a different pattern of sorption onto fibers than that of crude oil and diesel spills. Upon comparing all the studied electrospun fibers to commercially available polypropylene fibrous sorbents, results show that the sorption efficiency of the electrospun fibers is superior. Most notably, both PS-PE5 and PS-PVC5 fibers showed to be highly more effective than commercially available polypropylene (PP) sorbents towards all types of oil spills.
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Cao, Benyi, Livia Ribeiro de Souza, and Abir Al-Tabbaa. "Organic Contaminant-Triggered Self-Healing Soil Mix Cut-Off Wall Materials Incorporating Oil Sorbents." Materials 13, no. 24 (December 18, 2020): 5802. http://dx.doi.org/10.3390/ma13245802.
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Soil mix cut-off walls have been increasingly used for containment of organic contaminants in polluted land. However, the mixed soil is susceptible to deterioration due to aggressive environmental and mechanical stresses, leading to crack-originated damage and requiring costly maintenance. This paper proposed a novel approach to achieve self-healing properties of soil mix cut-off wall materials triggered by the ingress of organic contaminants. Oil sorbent polymers with high absorption and swelling capacities were incorporated in a cementitious grout and mixed with soil using a laboratory-scale auger setup. The self-healing performance results showed that 500 µm-wide cracks could be bridged and blocked by the swollen oil sorbents, and that the permeability was reduced by almost an order of magnitude after the permeation of liquid paraffin. It was shown by micro-CT scan tests that the network formed by the swollen oil sorbents acted as attachments and binder, preventing the cracked mixed soil sample from crumbling, and that the oil sorbents swelled three times in volume and therefore occupied the air space and blocked the cracks in the matrix. These promising results exhibit the potential for the oil sorbents to provide soil mix cut-off walls in organically-contaminated land with self-healing properties and enhanced durability.
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Aleskerova, L. E., S. G. Vasilieva, A. S. Morozov, A. D. Ismailov, and E. S. Lobakova. "Bioluminescence Toxicity Assay of Polyethylenimine-Based Sorbents." Biotekhnologiya 36, no. 3 (2020): 73–81. http://dx.doi.org/10.21519/0234-2758-2020-36-3-73-81.
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The toxicity of polyethylenimine-based sorbents and their extracts was evaluated and their effect on the bioluminescence of Photobacterium phosphoreum photobacteria was studied. These test bacteria are commonly used as objects to determine the toxicity of various materials. The analyzed materials were synthesized by cross-linking PEI with diethylene glycol diglycidyl ether (DGDE) at mass contents of the latter of 1.9-120.0% with subsequent freezing. It was found that the degree of luminescence inhibition in the P. phosphoreum cells depended on the PEI/DGDE ratio in the sorbent. The sorbents with high DGDE content (60-120%) did not affect the cell luminescence activity, while those with a lower percentage of the cross-linker (0.9-30%) exerted a pronounced inhibitory effect on luminescence of photobacteria according to the data obtained via the standard biotesting method. It was also established that the inhibitory effect of sorbents with a lower DGDE percentage (<30%) in a phosphate buffer was significantly lower than in salt solutions. Water and ethanol extracts of sorbents with the DGDE mass percentage of more than 15% did not significantly inhibit the luminescence of P. phosphoreum during 1 h of incubation. Immobilization of P. phosphoreum cells on the surface and internal parts of the studied sorbents was observed by the method of scanning electron microscopy. bioluminescence, biotest, toxicity analysis, photobacteria, polymer sorbents, polyethylenimine This study was funded by the Russian Science Foundation (Grant no. 16-14-00112).
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Hroboňová, Katarína, and Andrea Špačková. "Application of selective polymeric sorbents for simple coumarins extraction from deodorant samples." Acta Chimica Slovaca 13, no. 1 (April 1, 2020): 56–62. http://dx.doi.org/10.2478/acs-2020-0009.
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AbstractCoumarins (2H-1-benzopyran-2-coumarin derivatives) are derivatives of cinnamic acid naturally occurring in many plants, fungi, and fruits. They are used as ingredients in cosmetics to enhance the aroma and other biological effects. In this work, cosmetic samples (deodorants) were treated by solid phase extraction prior to high performance liquid chromatography determination of coumarins. Traditional sorbent (C18) and selective polymer-based sorbents (laboratory prepared and commercial) were used for solid phase extraction. Recovery values were above 85 % (RSDs below 6 %) except for esculin, where the recovery was lower. Core-shell column of C18 type and gradient of mobile phase methanol—1 % acetic acid were used for high performance liquid chromatography analysis of extracts. Limits of quantitation were 0.5 µg mL−1 for coumarin (ultraviolet detection) and below 12 ng mL−1 for esculin, umbelliferonene, scoparone, 4-methylumbelliferone, herniarin (fluorescence detection). In the tested samples, no coumarins were detected.
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Trochimczuk, Andrzej W., Michael Streat, and Bożena N. Kolarz. "Highly polar polymeric sorbents." Reactive and Functional Polymers 46, no. 3 (January 2001): 259–71. http://dx.doi.org/10.1016/s1381-5148(00)00056-0.
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Stempkowska, Agata, Piotr Izak, and Joanna Mastalska-Popławska. "Selected elements cations exchange in acidic medium on sorbents surface based on modified brown coal." Gospodarka Surowcami Mineralnymi 33, no. 1 (March 1, 2017): 139–50. http://dx.doi.org/10.1515/gospo-2017-0002.
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Abstract Studies on the sorption and desorption of selected Na+, Ca2+, Mg2+, Mn2+, Cu2+ and Cr3+ cations by materials based on modified brown coal were carried out. The chemical modification of the sorbent material consisted of grinding involving different inorganic substances and organic polymers. Samples were subjected to chemical modification at elevated temperatures for several hours. For comparative purposes, as apart from brown coal, pure humic acids are known for the highest cations exchange capacity, samples of brown coal before and after purification were also analyzed. The ion capacity was determined under static conditions, measuring the difference in the concentration of cations in the sorbent before and after sorption and then after rinsing the sorbent with distilled water (A), and after the desorption process with hydrochloric acid (B). Studies have shown that sorbents based on modified brown coal have rather significant exchange capacities in the range of 270-450 meq/100 g for the first stage and 90-200 meq/100 g for the second stage. It was also found that purified humic acid (450-200 meq/100 g) has the highest exchange capacity and modified brown coal obtained at 250°C has the lowest. The measurement of desorption showed that approximately 10% of the cations are already leached by distilled water and the residue is desorbed under the influence of 10% hydrochloric acid, but the total amount of cations is compatible with the measurement process of the second stage. The sorption affinity to various cations is different. In the case of the sorption measurements, modified sorbents show the highest sorption affinity with respect to calcium, while the unmodified raw brown coal with respect to chromium. The next stage of the measurement showed that the valence of the cation has the highest impact on the sorption affinity.
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Senevirathna, S. T. M. L. D., S. Tanaka, S. Fujii, C. Kunacheva, H. Harada, B. R. Shivakoti, H. Dinh, and T. Ariyadasa. "Adsorption of four perfluorinated acids on non ion exchange polymer sorbents." Water Science and Technology 63, no. 10 (May 1, 2011): 2106–13. http://dx.doi.org/10.2166/wst.2011.295.
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Perfluorinated compounds (PFCs) have attracted global concern due to their ubiquitous distribution and properties of persistence, bio accumulation and toxicity. The process of adsorption has been identified as an effective technique to remove PFCs in water. Different non ion-exchange polymeric adsorbents were tested with regard to their sorption kinetics and isotherms at low PFCs concentrations. Selected PFCs were perfluorobutanoic acid (PFBA), perfluoroheptanoic acid (PFHpA), perfluorooctanoic acid (PFOA) and perfluorodecanoic acid (PFDA) and the tested polymers were three types of Dowex optopores (V-493, V503, and L493), Amberlite XAD-4, and Filtrasorb 400 (Granular Activated Carbon-GAC). We observed the selective adsorption of PFCs on synthetic polymers. For PFDA, Amberlite XAD-4 gave the Freundlich adsorption constant of 2,965 (μg PFCs/g sorbent)(μg PFCs/L)−n, which was higher than that of GAC (121.89 (μg PFCs/g sorbent) (μg PFCs/L)−n). In the case of PFBA, GAC showed better performance (13.36) (μg PFCs/g sorbent) μg PFCs/L)−n than synthetic polymers (0.62–5.23) (μg PFCs/g sorbent) (μg PFCs/L)−n. Adsorption kinetics of all adsorbents were well described (R2=0.85–1) by pseudosecond order kinetic model. Sorption capacity was influenced by initial PFCs concentration for all adsorbents. GAC reached the equilibrium concentration within 4 hours, Amberlite XAD 4 reached it within 10 hours and other polymers took more than 70 hours. Key words 9 adsorption, non ion-exchange polymers, PFCs, sorption isotherm, sorption kinetics
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Yessengeldi, A. M., A. A. Yessengulova, G. Zh Kayralapova, R. S. Iminova, and M. M. Beysebekov. "Obtaining of surface-active substance sorbents based on acrylate-clay polymers." International Journal of Biology and Chemistry 10, no. 2 (2017): 4–9. http://dx.doi.org/10.26577/2218-7979-2017-10-2-4-9.
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Zemskova, Larisa, Andrei Egorin, Eduard Tokar, Vladimir Ivanov, and Svetlana Bratskaya. "New Chitosan/Iron Oxide Composites: Fabrication and Application for Removal of Sr2+ Radionuclide from Aqueous Solutions." Biomimetics 3, no. 4 (December 4, 2018): 39. http://dx.doi.org/10.3390/biomimetics3040039.
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Here, we discuss the fabrication and problems of application of chitosan-based composite materials for the removal of hazardous metal ions from tap water and wastewater. The chitosan-based composites containing iron oxides for the uptake of Sr2+ ions were fabricated via a co-precipitation method with variation of the iron/chitosan ratio and pH of the medium. The morphology and composition of the fabricated sorbents were characterized using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX) and X-ray diffraction (XRD) analysis. We have shown that the suggested fabrication approach allows for a homogeneous distribution of the inorganic phase in the polymer matrix. Investigations of the sorption performance of the composites have shown that they are efficient sorbents for 90Sr radionuclides uptake from tap water. The composite sorbent containing amorphous iron oxide in a chitosan matrix and calcined at 105 °C showed the best sorption characteristics. We have also demonstrated that there is an optimal iron oxide content in the composite: with increasing oxide content, the efficiency of the sorbents decreases due to poor stability in solution, especially in alkaline media. The alternative approach yielding magnetic chitosan-based composites with sufficiently good sorption performance and stability in neutral and weakly alkaline media is suggested.
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VASILIEV, S. I., N. V. FOMINA, L. A. LAPUSHOVA, A. S. FEDOTOVA, and D. N. ZHURAVLEV. "BIOECOLOGICAL DIAGNOSTICS OF OIL-CONTAMINATED SOIL REMEDIATED WITH POLYMERIC SORBENTS." Periódico Tchê Química 16, no. 33 (March 20, 2019): 641–49. http://dx.doi.org/10.52571/ptq.v16.n33.2019.656_periodico33_pgs_641_649.pdf.
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The anthropogenic impact on ecosystems around developed oil fields has caused environmental issues that affect all habitats of living organisms. The sorption method is considered the most efficient and environmentally acceptable for the removal of petroleum substances from the soil. The advantages of polymeric sorbents are the ability to remove various contaminants to almost any residual concentration, absence of secondary contaminants, and sorption process controllability. The enzymatic activity of soil is an indicator of its ecological state and it can be used to assess the degree of contamination, the intensity of exposure, and efficiency of remediation. The enzymic analysis is performed by studying the activity levels of enzymes involved in different biochemical processes in soil. This can give more reliable information on changes in the state of the soil. In this research, the bioecological diagnostics of oil-contaminated soil was carried out by studying oxidative enzyme (catalase) and hydrolytic enzymes (urease, protease, and invertase) before and after application of sorbents. Based on a comparison of data obtained in study of enzyme and cellulolytic activity of the soil with a change in the total microbial count, morphological and biological properties of soil microorganisms and hematological, biochemical changes in biological models with regard to application rates of sorbent, it was revealed a correlation between the indices of biological activity of the soil, quantitative and specific composition of microorganisms. Chemical reactions occurring in the soil, associated with metabolism, decomposition, and synthesis of organic substances, migration of chemical compounds, mobilization of nutrients, are carried out with the help of enzymes. High sensitivity, accuracy, relative simplicity and easy operation of methods for determining the activity of soil enzymes allowed them to be used in studies in assessing the intensity and direction of biochemical processes that are essential for soil life and fertility. The activity of soil served an integral indicator of the environmental impact.
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Gutiérrez-Serpa, Adrián, Patricia I. Napolitano-Tabares, Jakub Šulc, Idaira Pacheco-Fernández, and Verónica Pino. "Role of Ionic Liquids in Composites in Analytical Sample Preparation." Separations 7, no. 3 (July 6, 2020): 37. http://dx.doi.org/10.3390/separations7030037.
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Ionic liquids (ILs) are a group of non-conventional salts with melting points below 100 °C. Apart from their negligible vapor pressure at room temperature, high thermal stability, and impressive solvation properties, ILs are characterized by their tunability. Given such nearly infinite combinations of cations and anions, and the easy modification of their structures, ILs with specific properties can be synthesized. These characteristics have attracted attention regarding their use as extraction phases in analytical sample preparation methods, particularly in liquid-phase extraction methods. Given the liquid nature of most common ILs, their incorporation in analytical sample preparation methods using solid sorbents requires the preparation of solid derivatives, such as polymeric ILs, or the combination of ILs with other materials to prepare solid IL-based composites. In this sense, many solid composites based on ILs have been prepared with improved features, including magnetic particles, carbonaceous materials, polymers, silica materials, and metal-organic frameworks, as additional materials forming the composites. This review aims to give an overview on the preparation and applications of IL-based composites in analytical sample preparation in the period 2017–2020, paying attention to the role of the IL material in those composites to understand the effect of the individual components in the sorbent.
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Glushankova, I. S., M. M. Kombarova, and A. S. Atanova. "Preparing Carbon Bactericide Sorbents from Waste Wood Boards." Voprosy sovremennoj nauki i praktiki. Universitet imeni V.I. Vernadskogo, no. 2(80) (2021): 007–15. http://dx.doi.org/10.17277/voprosy.2021.02.pp.007-015.
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The paper presents the results of research on the disposal of large-tonnage composite polymer waste - wood-particle boards by the method of catalytic low-temperature pyrolysis for preparation of carbon materials. Salts and nickel were used as catalysts. The influence of temperature, mass ratio “waste: metal ions” on the yield and properties of carbonizate was investigated. It was found that when pyrolysis is carried out at a temperature of 600 °C for 30 min in the presence of catalysts, carbon materials are formed with a developed porous structure and high sorption activity with respect to the methylene blue dye and iodine. It is shown that the metals catalyzing pyrolysis are incorporated into the processes of the forming sorbent. The studies carried out on the treatment of biologically active river water showed a high bactericidal ability of the obtained samples of sorbents. The developed method of catalytic pyrolysis of waste made it possible to obtain bactericidal carbon sorbents that can be used for deep additional purification and disinfection of biologically treated wastewater.
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Wei, Yuezhou, Khalid A. M. Salih, Mohammed F. Hamza, Toyohisa Fujita, Enrique Rodríguez-Castellón, and Eric Guibal. "Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III)." Polymers 13, no. 9 (May 8, 2021): 1513. http://dx.doi.org/10.3390/polym13091513.
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High-tech applications require increasing amounts of rare earth elements (REE). Their recovery from low-grade minerals and their recycling from secondary sources (as waste materials) are of critical importance. There is increasing attention paid to the development of new sorbents for REE recovery from dilute solutions. A new generation of composite sorbents based on brown algal biomass (alginate) and polyethylenimine (PEI) was recently developed (ALPEI hydrogel beads). The phosphorylation of the beads strongly improves the affinity of the sorbents for REEs (such as La and Tb): by 4.5 to 6.9 times compared with raw beads. The synthesis procedure (epicholorhydrin-activation, phosphorylation and de-esterification) is investigated by XPS and FTIR for characterizing the grafting route but also for interpreting the binding mechanism (contribution of N-bearing from PEI, O-bearing from alginate and P-bearing groups). Metal ions can be readily eluted using an acidic calcium chloride solution, which regenerates the sorbent: the FTIR spectra are hardly changed after five successive cycles of sorption and desorption. The materials are also characterized by elemental, textural and thermogravimetric analyses. The phosphorylation of ALPEI beads by this new method opens promising perspectives for the recovery of these strategic metals from mild acid solutions (i.e., pH ~ 4).
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Stevens, Morlu G. F., and Bareki S. Batlokwa. "Multi-templated Pb-Zn-Hg Ion Imprinted Polymer for the Selective and Simultaneous Removal of Toxic Metallic Ions from Wastewater." International Journal of Chemistry 9, no. 2 (February 16, 2017): 10. http://dx.doi.org/10.5539/ijc.v9n2p10.
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A multi-templated Pb-Zn-Hg ion imprinted polymer was synthesized to demonstrate the selective and simultaneous removal of the named targeted ions. Molecular Imprinting Technology was employed, guided by thermal bulk polymerization method, methacrylic acid as the functional monomer and ethylene glycol dimethylacrylate as crosslinking agent in the presence of the initiator azobisisobutyronitrile; Pb(II), Zn(II) and Hg(II) ions as template ions, and 1,10-phenanthroline as the complexing agent. Rigorous, optimal template removal method was employed. Physical and chemical properties of the sorbent were investigated using Fourier Transform Infrared Spectroscopy, X-ray Diffraction and Atomic Force Microscopy. Operational parameters: time, pH and sorbent dosage for the rebinding batch experiments were optimized and found to be 15 min, 7.5 and 666.7 mg/L respectively. Percentage recoveries of the removed targeted ions from spiked samples were: 92.14 ± 0.16%, 106.09 ± 0.17% and 99.86 ± 0.04%. The synthesized sorbents showed good selectivity towards the targeted metal ion by removing 90% - 98% of the templated ions as compared to 58% - 62% of the competitive ions.
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Обуздина, Marina Obuzdina, Руш, E. Rush, Шалунц, and L. Shalunc. "Sorption Purification of Effluent Water From Heavy Metal Ions by Modified Natural Zeolites." Safety in Technosphere 6, no. 2 (August 21, 2017): 56–61. http://dx.doi.org/10.12737/article_598d7af88ce043.55438902.
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Features of sorption method of effluent water purification are considered. Analysis of technologies of effluent water purification from heavy metalsionsis presented. Physico-chemical regularities of sorption of Zn, Ni, Cu ions are investigated. As sorbents it is proposed to use zeolites of Holinsky deposits, modified by sulfur polymer, obtained from waste of epichlorohydrin production. This will allow simultaneously solving two problems: elimination of waste and wastewater purification, which is significantly advantageous from the economic point of view. Kinetic curves of sorption of Zn, Ni, Cu ions in different solution concentrations are presented. Also the adsorption process of heavy metal ions from solutions of chemically modified zeolites in the evaluation of the influence of various factors (the contact time of sorbent with solution, pH and temperature) are investigated.
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Pakade, Vusumzi, and Luke Chimuka. "Polymeric sorbents for removal of Cr(VI) from environmental samples." Pure and Applied Chemistry 85, no. 12 (December 1, 2013): 2145–60. http://dx.doi.org/10.1351/pac-con-12-11-17.
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Chromium (Cr) is an important raw material in some chemical industries including paint, pigments, textiles, leather tanning, steel fabrication, electroplating, cement preservation, and canning industries. Once in the environment, Cr exists in various oxidation states depending on pH and concentration. Trivalent [Cr(III)] and hexavalent [Cr(VI)] forms are the most common with Cr(VI) being the most toxic to biota. The review discusses various types of polymeric sorbents that have been prepared for the extraction of Cr(VI) from environmental samples, mostly aqueous samples. Sorbents are categorized into biosorbents, hybrid sorbents, synthetic polymeric, and modified natural polymeric sorbents. Most of the emphasis will be on the advantages and disadvantages of different synthetic polymeric sorbents. Important parameters that define the performance of the sorbents, that is, binding capacity, equilibration time, optimum sample pH, and selectivity, are compared.
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Léonard, D., S. D. Clas, and G. R. Brown. "Polymeric sorbents for bile acids." Reactive Polymers 20, no. 1-2 (July 1993): 131–40. http://dx.doi.org/10.1016/0923-1137(93)90073-o.
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Mtolo, Sinothando P., Precious N. Mahlambi, and Lawrence M. Madikizela. "Synthesis and application of a molecularly imprinted polymer in selective solid-phase extraction of efavirenz from water." Water Science and Technology 79, no. 2 (January 15, 2019): 356–65. http://dx.doi.org/10.2166/wst.2019.054.
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Abstract Efavirenz is one of the antiretroviral drugs widely used to treat the human immunodeficiency virus. Antiretroviral drugs have been found to be present in surface water and wastewater. Due to complexity of environmental samples, solid-phase extraction (SPE) is used for isolation and pre-concentration of antiretroviral drugs prior to their chromatographic analysis. However, the commercially available SPE sorbents lack selectivity, which tends to prolong the analysis time. Therefore, in this study a molecularly imprinted polymer was synthesized for the specific recognition of efavirenz and then applied as the SPE sorbent for its extraction from wastewater and surface water samples. The imprinted and non-imprinted polymers were synthesized using a bulk polymerization technique where efavirenz was used as the template, 2-vinylpyridine as functional monomer, 1,1′-azobis-(cyclohexanecarbonitrile) as initiator, ethylene glycol dimethacrylate as cross-linker and toluene:acetonitrile (9:1, v/v) as the porogenic solvent mixture. The characterization was performed using Fourier transform infrared spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller, elemental analysis, and thermogravimetric analysis techniques. Results showed better selectivity of molecularly imprinted polymer to efavirenz than did non-imprinted polymer. The analysis was performed using high performance liquid chromatography equipped with a photo-diode array detector. The analytical method gave a detection limit of 0.41 μg/L and the analyte recovery of 81% in wastewater. The concentrations found in wastewater ranged from 2.79 to 120.7 μg/L, while in surface water they were between 0.975 and 2.88 μg/L. Therefore, the results of this study show a strong need for a detailed screening of efavirenz in major water utilities in the country.
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Yilmaz, G., F. L. Meng, W. Lu, J. Abed, C. K. N. Peh, M. Gao, E. H. Sargent, and G. W. Ho. "Autonomous atmospheric water seeping MOF matrix." Science Advances 6, no. 42 (October 2020): eabc8605. http://dx.doi.org/10.1126/sciadv.abc8605.
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The atmosphere contains an abundance of fresh water, but this resource has yet to be harvested efficiently. To date, passive atmospheric water sorbents have required a desorption step that relies on steady solar irradiation. Since the availability and intensity of solar radiation vary, these limit on-demand desorption and hence the amount of harvestable water. Here, we report a polymer–metal-organic framework that provides simultaneous and uninterrupted sorption and release of atmospheric water. The adaptable nature of the hydro-active polymer, and its hybridization with a metal-organic framework, enables enhanced sorption kinetics, water uptake, and spontaneous water oozing. We demonstrate continuous water delivery for 1440 hours, producing 6 g of fresh water per gram of sorbent at 90% relative humidity (RH) per day without active condensation. This leads to a total liquid delivery efficiency of 95% and an autonomous liquid delivery efficiency of 71%, the record among reported atmospheric water harvesters.
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Burmaa, G., S. Alen, Yu Ganchimeg, and I. Sukhbaatar. "The Precious metals (Au, Ag, Pt, Pd, Rh) adsorption on the Silicon – organic sorbents." Mongolian Journal of Chemistry 12 (September 24, 2014): 29–34. http://dx.doi.org/10.5564/mjc.v12i0.167.
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Sorption activity of two types of Silicon-organic sorbents for the previous metals has been studied. A polymer – poly (3- silsesquioxanilpropylthiocarbamate) - 3- silsesquioxanilpropylammonium which was obtained by the hydrolytic poly-condensation reaction and has been determined its physical, chemical characteristics and its sorption activity for the Ag(I), Au(III), Pt(IV), Pd(II), Rh(III). It has been found out that the sorbent shows high static sorption of Gold (III), Mercury (II) at acidic condition. The second a net structured silicon-organic copolymer {SiO2*2[O1.5Si(CH2)3NHC5H4N}n was synthesized by hydrolytic co-poly-condensation reaction. It likely to react as an anionit that adsorbs chloro-complex anion of the Au (III), Pt(IV), Pd(II), Rh(III).DOI: http://dx.doi.org/10.5564/mjc.v12i0.167 Mongolian Journal of Chemistry Vol.12 2011: 29-34
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Kong, Xueying, Shangsiying Li, Maria Strømme, and Chao Xu. "Synthesis of Porous Organic Polymers with Tunable Amine Loadings for CO2 Capture: Balanced Physisorption and Chemisorption." Nanomaterials 9, no. 7 (July 17, 2019): 1020. http://dx.doi.org/10.3390/nano9071020.
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The cross-coupling reaction of 1,3,5-triethynylbenzene with terephthaloyl chloride gives a novel ynone-linked porous organic polymer. Tethering alkyl amine species on the polymer induces chemisorption of CO2 as revealed by the studies of ex situ infrared spectroscopy. By tuning the amine loading content on the polymer, relatively high CO2 adsorption capacities, high CO2-over-N2 selectivity, and moderate isosteric heat (Qst) of adsorption of CO2 can be achieved. Such amine-modified polymers with balanced physisorption and chemisorption of CO2 are ideal sorbents for post-combustion capture of CO2 offering both high separation and high energy efficiencies.
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Belikov, Кonstantin, Ekateryna Bryleva, Zinaida Bunina, Victoria Varchenko, Anna Andryushchenko, Ilias Shcherbakov, Vitaliy Kalchenko, Andriy Drapailo, Alexander Zontov, and Larysa Zontova. "SOLID PHASE EXTRACTANTS BASED ON POROUS POLYMERS IMPREGNATED WITH MULTIDENTATE CHELATING LIGANDS FOR ACTINIDE AND LANTHANIDE REMOVAL." Science and Innovation 17, no. 2 (April 27, 2021): 64–71. http://dx.doi.org/10.15407/scine17.02.064.
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Introduction. Treatment and disposal of radioactive wastes as well as monitoring of radioactive isotope content in environmental objects are actual tasks in the developed world. Lanthanide and transuranium element removal from spent nuclear fuel of nuclear power plants allows decreasing waste amount to be dumped and diminishing the risk of environmental pollution by radionuclides. Problem Statement. Considering extreme radiotoxicity of transuranium elements and tight standards restricting their activity in air and water, there is an urgent need to develop accurate and highly sensitive methods for pollution control. Purpose. Development of solid phase extractants (SPEs) based on porous polymers impregnated with multidentate chelating ligands for lanthanide, uranium and transuranium element removal from aqueous solutions. Materials and Methods. The materials used are porous divinylbenzene polymers of POROLAS brand and styrene-divinylbenzene copolymers from Smoly SE (Kamianske); multidentate chelating ligands of actinides and lanthanides such as N,N,N´,N´-tetra-n-octyl-oxapentane-1,5-diamide (TODGA) and carbamoyl phosphine oxides (CMPO); sorbent from TrisKem (France) based on TRU Resin (Eichrom Industries, Inc.). The research techniques are inductively coupled plasma atomic emission spectrometry, IR spectroscopy, scanning electron spectroscopy, spectrofluorimetry. Results. The solid-phase extractants (SPEs) for actinide and lanthanide removal from aqueous solutions have been synthesized by impregnation of porous polymeric POROLAS matrices and TODGA, CMPO-(PhOct) and CMPO-(Ph2). Sorption kinetics has been studied and capacity values for the different sorbents have been estimated. Extractive columns for uranium and europium concentration have been manufactured. Conclusions. SPEs studied demonstrate a high efficiency in removing uranium and europium from aqueous solutions. Due to their characteristics obtained materials may be used for preconcentration of target ions in radioecologycal monitoring procedures.
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Jagadeesan, Kishore Kumar, Cecilia Rossetti, Abed Abdel Qader, Léon Reubsaet, Börje Sellergren, Thomas Laurell, and Simon Ekström. "Filter Plate–Based Screening of MIP SPE Materials for Capture of the Biomarker Pro-Gastrin-Releasing Peptide." SLAS DISCOVERY: Advancing the Science of Drug Discovery 22, no. 10 (January 31, 2017): 1253–61. http://dx.doi.org/10.1177/2472555216689494.
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Affinity-based solid-phase extraction (SPE) is an attractive low-cost sample preparation strategy for biomarker analysis. Molecularly imprinted polymers (MIPs) as affinity sorbents offer unique opportunities for affinity SPE, due to their low manufacturing cost and high robustness. A limitation is the prediction of their affinity; therefore, screening of analyte recovery and specificity within a large range of SPE conditions is important in order to ensure high-sensitivity detection and assay reproducibility. Here, a µ-SPE method for screening of the MIP-SPE materials using a commercial 384-well filter plate is presented. The method allows for rapid and automated screening using 10–30 µL of packed SPE sorbent per well and sample volumes in the range of 10–70 µL. This enables screening of many different SPE sorbents while simultaneously identifying optimal SPE conditions. In addition, the 384-well format also facilitates detection with a multitude of analytical platforms. Performance of the µ-MIP-SPE method was investigated using a series of MIPs designed to capture pro-gastrin-releasing peptide (ProGRP). Fractions coming from sample load, cartridge wash, and elution were collected and analyzed using mass spectrometry (MS). The top-performing MIPs were identified, together with proper SPE conditions.
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Nasir, Mohammad Ibrahim Nasir, Md Zakir Hossain Hossain, and P. A. Charpentier Charprntier. "Synthesis and Characterization of Date Palm Fiber-Based Bio-Char and Activated Carbon and its Utilization for Environmental Remediation." Journal of Petroleum Research and Studies 8, no. 2 (May 6, 2021): 209–22. http://dx.doi.org/10.52716/jprs.v8i2.245.
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Natural agricultural products have the potential to be a substitute for synthetic polymers absorbentsin environmental remediation and spill cleanup and recovery. One of these natural by-productswhich is available in many regions of the world is Date Palm Fibers (DPF). DPF (also known assurface fibers) is a natural sorbent that exhibits good sorption characteristics. In an attempt tovalorize this abundant, low cost byproduct, we have investigated the micro porosity of this rawmaterial by carrying out two procedures. First, hydrothermal pyrolysis using a scalable reactor withonly water as solvent at high temperature (480 °C) under dry nitrogen atmosphere. Biochar yield wasfound varying from 30.5 to 33.6% (32%), with little bio-oil.Then the resultant biochar was physically activated with KOH and the mixture heated to 750oC(0.5oC/min) and kept at 750°C for 2 hours under Argon flow in a tubular furnace to produceactivated carbon. Second, the resulting biochar and activated carbons were then characterized byParticle Analyzer to measure their surface area, pore volume and pore diameter.For biochar, surface area : 1.1374 m²/g, pore volume 0.001883 cm³/g, pore diameter 1355.874 Å andfor activated biochar (activated carbon), surface area : 1220.2755 m²/g, pore volume: 0.062068cm³/g, pore diameter: 19.0116 Å were determined by particle characterization analyzer. ScanningElectron Microscopy (SEM), and X-ray Diffraction (XRD) was also used for other analysis .The oil sorption behavior of the raw DPF, biochar and activated biochar were examined with motoroil. The Oil Sorption Capacity (OSC) of raw DPF, biochar and activated biochar were tested with theoil as oil alone and an oil over water surface and the value calculated gravimetrically. The maximumOSC values of the sorbents were in the order of: DPF<biochar< activated Biochar with OSC valuesof 8.952, 11.712 and 33.402 g*oil/g*sorbent, respectively at a sorption time of 30 min. That indicatethe OSC of the sorbents above are proportional with its surface areas.The sorbent materials can be utilized in oil spill remediation as well as waste water treatment forremoval of hydrocarbons pollutants from water. In addition biochar can be used as a soil amendmentfor enhancing soil fertility
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Patel, Hasmukh A., and Cafer T. Yavuz. "Highly optimized CO2 capture by inexpensive nanoporous covalent organic polymers and their amine composites." Faraday Discussions 183 (2015): 401–12. http://dx.doi.org/10.1039/c5fd00099h.
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Carbon dioxide (CO2) storage and utilization requires effective capture strategies that limit energy penalties. Polyethylenimine (PEI)-impregnated covalent organic polymers (COPs) with a high CO2 adsorption capacity are successfully prepared in this study. A low cost COP with a high specific surface area is suitable for PEI loading to achieve high CO2 adsorption, and the optimal PEI loading is 36 wt%. Though the adsorbed amount of CO2 on amine impregnated COPs slightly decreased with increasing adsorption temperature, CO2/N2 selectivity is significantly improved at higher temperatures. The adsorption of CO2 on the sorbent is very fast, and a sorption equilibrium (10% wt) was achieved within 5 min at 313 K under the flow of simulated flue gas streams. The CO2 capture efficiency of this sorbent is not affected under repetitive adsorption–desorption cycles. The highest CO2 capture capacity of 75 mg g−1 at 0.15 bar is achieved under dry CO2 capture however it is enhanced to 100 mg g−1 in the mixed gas flow containing humid 15% CO2. Sorbents were found to be thermally stable up to at least 200 °C. TGA and FTIR studies confirmed the loading of PEIs on COPs. This sorbent with high and fast CO2 sorption exhibits a very promising application in direct CO2 capture from flue gas.
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Ciesińska, Wiesława, Grzegorz Makomaski, Janusz Zieliński, and Tatiana Brzozowska. "Preparation of sorbents from selected polymers." Polish Journal of Chemical Technology 13, no. 1 (January 1, 2011): 51–54. http://dx.doi.org/10.2478/v10026-011-0010-0.
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Preparation of sorbents from selected polymers In this work, the results of studies on the preparation of sorbents from selected polymers were presented. The polymers were carbonized and subsequently physically activated by steam or carbon dioxide, or alternatively, chemically activated with potassium hydroxide. For the obtained materials, a specific area was evaluated by means of low-temperature nitrogen adsorption and benzene adsorption, iodine number was also determined. The obtained results indicated a possibility to procure hydrophobic sorbents of microporous structure. Sorbents having the best properties, i.e. the specific area of above 2000 m2/g were produced from poly(ethylene terephthalate) and phenol-formaldehyde resin.
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Aleem, Muhammad, Ghulam Hussain, Muhammad Sultan, Takahiko Miyazaki, Muhammad H. Mahmood, Muhammad I. Sabir, Abdul Nasir, Faizan Shabir, and Zahid M. Khan. "Experimental Investigation of Desiccant Dehumidification Cooling System for Climatic Conditions of Multan (Pakistan)." Energies 13, no. 21 (October 22, 2020): 5530. http://dx.doi.org/10.3390/en13215530.
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In this study, experimental apparatus of desiccant dehumidification was developed at lab-scale, using silica gel as a desiccant material. Experimental data were obtained at various ambient air conditions, while focusing the climatic conditions of Multan (Pakistan). A steady-state analysis approach for the desiccant dehumidification process was used, and thereby the slope of desiccant dehumidification line on psychrometric chart (ϕ*) was determined. It has been found that ϕ* = 0.22 in case of silica gel which is lower than the hydrophilic polymeric sorbent, i.e., ϕ* = 0.31. The study proposed two kinds of systems, i.e., (i) standalone desiccant air-conditioning (DAC) and (ii) Maisotsenko-cycle-assisted desiccant air-conditioning (M-DAC) systems. In addition, two kinds of desiccant material (i.e., silica gel and hydrophilic polymeric sorbent) were investigated from the thermodynamic point of view for both system types, using the experimental data and associated results. The study aimed to determine the optimum air-conditioning (AC) system type, as well as adsorbent material for building AC application. In this regard, perspectives of dehumidification capacity, cooling capacity, and thermal coefficient of performance (COP) are taken into consideration. According to the results, hydrophilic polymeric sorbent gave a higher performance, as compared to silica gel. In case of both systems, the performance was improved with the addition of Maisotsenko cycle evaporative cooling unit. The maximum thermal COP was achieved by using a polymer-based M-DAC system, i.e., 0.47 at 70 °C regeneration temperature.
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Ansone, Linda, Linda Eglite, and Maris Klavins. "Removal of arsenic compounds with peat, peat-based and synthetic sorbents / Usuwania związków arsenu za pomocą torfu, sorbentów na bazie torfu i sorbentów syntetycznych." Ecological Chemistry and Engineering S 19, no. 4 (November 1, 2012): 513–31. http://dx.doi.org/10.2478/v10216-011-0037-4.
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Abstract Arsenic contamination of waters is a global problem; therefore, new approaches for its removal are needed. Peat, peat modified with iron compounds, iron humates and polymeric cation exchangers modified with iron were prepared and tested for sorption of arsenic compounds in comparison with weakly basic anionites. The highest sorption capacity was observed when peat sorbents modified with iron compounds were used. Sorption of different arsenic speciation forms onto iron-modified peat sorbents was investigated as a function of pH and temperature. It was established that sorption capacity increases with a rise in temperature, and the calculation of sorption process thermodynamic parameters indicates the spontaneity of sorption process and its endothermic nature.
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Alieva, Aygun F., Fatali E. Guseynov, Nazim T. Shamilov, Narmin T. Afandiyeva, and Famil M. Chyragov. "SORPTION OF CERIUM(III) IONS ONTO CHELATING POLYMERIC SORBENT." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 8 (August 19, 2019): 71–75. http://dx.doi.org/10.6060/ivkkt.20196208.5898.
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In a present paper methods of concentration of Ce(III) from aqueous solutions onto synthetic polymer adsorbent. The sorption-photometric determination of the microquantities of cerium ions by new polymeric chelating sorbent, modified with dithizone has been studied. Sorption process was carried out under static conditions. Optimal characteristics of the sorption process: influence of pH, time of contact, effect of the initial concentration of metal, influence of ionic strength were studied. pH for extracting Ce is 5; the residence time is 210 min. Optimal ionic strength was achieved at a value of μ =0.6. The sorption capacity of the sorbent and the percentage recovery were determined from the difference in the initial and final concentrations of cerium(III) in the solution. The sorbability of cerium(III) ions was 91.38%, sorption capacity of sorbent with respect to cerium ions is 682.85 mg∙g-1. At the final stage, a desorption process was carried out using different (organic and mineral) acids with the same concentrations (0.5, 1.0, 1.5, and 2.0 M). 1M HCl has the highest eluting ability with respect to cerium (III) ions. Sorbent modified with dithizone based on a styrene-maleic anhydride (SMA) copolymer is proposed as synthetic sorbent with the best analytical properties (high sorption capacity, residence time 3 h with respect to cerium ions). Multiple use of the regenerated sorbent for concentration is possible. The developed techniques can be used to determine Ce(III) in standard samples, soil and tap water.