Academic literature on the topic 'Complexe adsorbant'
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Journal articles on the topic "Complexe adsorbant"
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Ferrandon, O., H. Bouabane, and M. Mazet. "Contribution à l'étude de la validité de différents modèles, utilisés lors de l'adsorption de solutés sur charbon actif." Revue des sciences de l'eau 8, no. 2 (April 12, 2005): 183–200. http://dx.doi.org/10.7202/705218ar.
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Les résultats de l'adsorption sur charbon actif en poudre de solutions aqueuses de différents composés organiques: phénol, aniline, nitrobenzène, acide salicylique, nitro-4 phénol, méthyl-2 dinitro-4,6 phénol, phénylalanine et tyrosine ont été traités à l'aide des équations de Langmuir, Elovich, Freundlich, Temkin, Fowler-Guggenheim, Hill et De Boer, Kiselev afin de déterminer divers paramètres d'équilibre: la capacité maximum d'adsorption, l'énergie d'adsorption, l'énergie d'interaction, les constantes d'équilibre adsorbat-adsorbant et les interactions (éventuelles) entre les molécules adsorbées. La relation de Temkin (3=RTt~Q In KoC permet de déterminer la variation de l'énergie d'adsorption ~Q et la constante Ko de l'équilibre (~3 est le degré de re- couvrement du charbon par le soluté, et C la concentration à l'équilibre). L'équa- tion de Fowler-Guggenheim KC=~3/(1~3) Exp (2 ~ W/RT) conduit à la déter- mination de l'énergie d'interaction W entre molécules adsorbées et à une constante d'équilibre K. Par contre, dans l'équation de Hill et de De Boer KlC=~/(1~)) Exp [~/(1~) - K2~/RTI, K2 représente une constante d'énergie d'interaction entre molécules adsorbées et, dans celle de Kiselev KIC=~3/[(1+ ~) (1 + Kn~3)]~ Kn est une constante de formation de complexe éventuel entre molécules adsorbées. On vérifie que l'application de la relation de Temkin est satisfaisante pour tous les composés étudiés et permet de les classer selon leur affinité sur le charbon mais les résultats obtenus en utilisant les équations suivantes (Fowler ...) montrent qu'il n'y aurait pas de formation de complexe ou d'interaction entre molécules adsorbées.
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Fabre, B., J. Ayele, M. Mazet, and P. Lafrance. "Adsorption du pentachlorophenol sur divers matériaux : Influence de co-adsorbats organiques (Substances humiques et lindane)." Revue des sciences de l'eau 3, no. 3 (April 12, 2005): 277–92. http://dx.doi.org/10.7202/705075ar.
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Nous avons réalisé, pour de faibles concentrations, l'étude de l'adsoprtion d'un pesticide le pentachlorophénol, sur plusieurs matériaux adsorbants : le charbon actif, la kaolinite et la bentone. Les résultats montrent que l'adsorption du pentachlorophénol sur la kaolinite reste négligeable tandis que la bentone SD-3 (argile traitée) permet d'obtenir des résultats intéressants avec toutefois une capacité maximale d'adsorption 10 à 100 fois plus faible que celle du charbon actif. Le charbon actif reste le meilleur matériau adsorbant pour le pentachlorophénol. La solubilité de ce composé étant très variable en fonction du pH du milieu on constate que l'adsorption du pentachlorophénol-pentachlorophénate (5 mg.l-1) diminue pour des valeurs de pH supérieures au pKa du couple acide-base que nous avons déterminé expérimentalement, égal à 5,9 ± 0,1. L'adsorption du pentachlorophénol n'est pas affectée par la présence d'acides humiques (obtenus à partir de substances commerciales) utilisés comme coadsorbats (10 mg.l-1) alors que les acides fulviques (20 mg.l-1) extraits de sols semblent provoquer une promotion de l'adsorption. On observe d'autre part que le pentachlorophénol n'affecte pas l'adsorption des acides humiques mais augmente légèrement celle des acides fulviques. Ces remarques suggèrent la possible formation d'un complexe acides fulviques-pentachlorophénol. Lorsqu'on utilise le lindane, pesticide hydrophobe comme coadsorbat (165 mg.l-1), on observe encore d'une façon systématique pour tous les nombreux essais une légère promotion de l'adsorption.
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Rasoulifard, Mohammad Hossein, Soghra Khanmohammadi, and Azam Heidari. "Adsorption of cefixime from aqueous solutions using modified hardened paste of Portland cement by perlite; optimization by Taguchi method." Water Science and Technology 74, no. 5 (June 14, 2016): 1069–78. http://dx.doi.org/10.2166/wst.2016.230.
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In the present study, we have used a simple and cost-effective removal technique by a commercially available Fe-Al-SiO2 containing complex material (hardened paste of Portland cement (HPPC)). The adsorbing performance of HPPC and modified HPPC with perlite for removal of cefixime from aqueous solutions was investigated comparatively by using batch adsorption studies. HPPC has been selected because of the main advantages such as high efficiency, simple separation of sludge, low-cost and abundant availability. A Taguchi orthogonal array experimental design with an OA16 (45) matrix was employed to optimize the affecting factors of adsorbate concentration, adsorbent dosage, type of adsorbent, contact time and pH. On the basis of equilibrium adsorption data, Langmuir, Freundlich and Temkin adsorption isotherm models were also confirmed. The results showed that HPPC and modified HPPC were both efficient adsorbents for cefixime removal.
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Ouattara, Victor Tiéba, Zoumana Konate, Gustave Francis Messoum, Emmanuel Koffi Kassin, Mathias Gnion Tahi, Louis Anselme Koko, Brahima Kone, Emmanuel Acka Dick, and Maméri Camara. "Effets de la fertilisation organo-phosphatée sur la fertilité en matière organique et complexe adsorbant d’un ferralsol sous cacaoyers dans la région de Divo (Côte d’Ivoire)." International Journal of Biological and Chemical Sciences 12, no. 6 (February 22, 2019): 2901. http://dx.doi.org/10.4314/ijbcs.v12i6.33.
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Botana-de la Cruz, Anakaren, Philip E. Boahene, Sundaramurthy Vedachalam, Ajay K. Dalai, and John Adjaye. "Mesoporous Adsorbents for Desulfurization of Model Diesel Fuel: Optimization, Kinetic, and Thermodynamic Studies." Fuels 1, no. 1 (November 14, 2020): 47–58. http://dx.doi.org/10.3390/fuels1010005.
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Mesoporous alumina-based adsorbents consisting of a π-electron acceptor complexing agent (2,7-dinitro-9-fluorenone) were synthesized and characterized. Adsorbents were screened for the removal of sulfur compounds from a model ultra-low-sulfur diesel fuel via a charge transfer complex (CTC) mechanism. The sulfur adsorption isotherms and kinetics were examined. The kinetics of sulfur adsorption followed a pseudo-second-order model with the CTC adsorbents. Among the three adsorbents screened, a commercial γ-Al2O3 CTC adsorbent showed the highest desulfurization in a short-run period. The regeneration of spent adsorbent was studied with three different polar solvents, namely chloroform, dichloromethane, and carbon tetrachloride. Dichloromethane was found to be the most suitable solvent for extracting a major portion of sulfur compounds occupied in the pores of the spent adsorbent. γ-Al2O3 CTC adsorbent can be reused after regeneration. Thermodynamic parameters such as Ea, ΔG, ΔH, and ΔS provided a better insight into the adsorption process.
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Gordon, Hungerford, Laycock, Ouwerkerk, and Fletcher. "Adsorbents for the Sequestration of the Pimelea Toxin, Simplexin." Proceedings 36, no. 1 (February 12, 2020): 90. http://dx.doi.org/10.3390/proceedings2019036090.
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Pimelea poisoning affects cattle grazing arid rangelands of Australia, has no known remedy and significant outbreaks can cost the industry $50 million per annum. Poisoning is attributable to consumption of native Pimelea plants containing the toxin simplexin. Charcoal, bentonite and other adsorbents are currently used by the livestock industry to mitigate the effects of mycotoxins. The efficacy of such adsorbents to mitigate Pimelea poisoning warrants investigation. Through a series of in vitro experiments, different adsorbents were evaluated for their effectiveness to bind simplexin using a simple single concentration, dispersive adsorbent rapid screening method. Initial experiments were conducted in a rumen fluid based medium, with increasing quantities of each adsorbent: sodium bentonite (Trufeed®, Sibelco Australia), biochar (Nutralick®Australia) and Elitox® (Impextraco, Belgium). Data showed the unbound concentration of simplexin decreased with increasing quantities of each adsorbent tested. Sodium bentonite performed best, removing ~95% simplexin at 12 mg/mL. A second experiment using a single amount of adsorbent included two additional adsorbents: calcium bentonite (Bentonite Resources, Australia) and a synthetic adsorbent (Waters, USA). The concentration of simplexin remaining in the solution after 1 h, the amount able to be desorbed off the adsorbent-toxin matrix with replacement fresh fluid, and the amount remaining bound to the adsorbent were measured. All samples containing an adsorbent were statistically different compared to the blank (p < 0.05), indicating some binding activity. Future work will explore the binding mechanisms and behaviour of the toxin-adsorbent complex in the lower gastrointestinal tract.
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Olufemi, Babatope Abimbola, and Anne Nlerum. "Parametric Statistical Significance of Iron (II) Ions Adsorption by Coconut Shell in Aqueous Solutions." NUST Journal of Engineering Sciences 11, no. 1 (March 10, 2019): 17–25. http://dx.doi.org/10.24949/njes.v11i1.285.
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The parametric statistical adsorption of chemically unmodified coconut shell powder (CSP) to adsorb iron (II) ions from aqueous solutions was examined in this work. It was observed that the adsorption capacity increased with increasing adsorbent dose, reducing adsorbate dose, increasing contact time, decreasing temperature and reducing particle size. As observed about one gram of the adsorbent was sufficient enough to remove 98 % iron (II) ions. A total contact time of about 40 minutes was sufficient for almost complete adsorption of the ions, while a pH of about 6.0 exhibited the maximum adsorption capacity. The sorption data were fitted into Langmuir, Freundlich, Temkin and the Dubinin-Radushkevich isotherms, fitted most with the Freundlich Isotherm model. The energy values obtained from the Temkin and Dubinin-Radushkevich isotherm model indicated high chemisorption phenomenon with the adsorbents. Investigation of some kinetic models confirmed that the adsorption of iron (II) ions using CSP was a pseudo-second order kinetic process, which further corroborates that chemisorption dominates the adsorption. Fourier Transform Analysis (FTIR) further established and justified the outcome of the study. The adsorption was parametrically justified statistically with Analysis of Variance (ANOVA) and Bonferroni-Holm Posthoc significance test. Conclusively, coconut shell proved strongly to be an effective and suitable adsorbent for removing iron (II) ions from aqueous solutions.
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Irdhawati, Irdhawati, Alling Andini, and Made Arsa. "DAYA SERAP KULIT KACANG TANAH TERAKTIVASI ASAM BASA DALAM MENYERAP ION FOSFAT SECARA BATH DENGAN METODE BATH." Jurnal Kimia Riset 1, no. 1 (August 29, 2016): 52. http://dx.doi.org/10.20473/jkr.v1i1.2443.
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AbstrakKulit kacang tanah digunakan sebagai adsorben untuk menyerap ion fosfat dalam larutan. Sebelum digunakan sebagai adsorben, kulit kacang tanah dicuci, dikeringkan, dihaluskan menggunakan blender dan diayak dengan ukuran partikel ≤ 100 mesh. Serbuk halus diaktifkan dengan asam (H2SO4) dan basa (NaOH) pada berbagai konsentrasi. Selanjutnya, adsorben dengan dan tanpa aktivasi digunakan untuk menentukan kadar fosfat yang terserap secara optimum. Parameter adsorpsi yang digunakan adalah waktu kontak dan kapasitas adsorpsi. Kapasitas adsorpsi diukur dengan mereaksikan ion fosfat dengan adsorben, dan sisa analit dalam larutan ditambahkan dengan amonium molibdat membentuk senyawa kompleks amonium fosfomolibdat berwarna biru dalam larutan asam. Konsentrasi senyawa kompleks ditentukan dengan metode spektrofotometri UV-Visible.Hasil dalam proses aktivasi menunjukkan konsentrasi optimum asam adalah 0,05 M, dan basa sebesar 0,5 M. Waktu kontak optimum diperoleh 45 menit untuk adsorben tanpa aktivasi dan aktivasi basa, sedangkan untuk aktivasi asam 30 menit. Kapasitas adsorpsi optimum berturut-turut adalah 8,5 mg/g; 8,8 mg/g, dan 10,4 mg/g menggunakan adsorben tanpa aktivasi, teraktivasi asam dan teraktivasi basa. Adsorben teraktivasi basa memiliki kapasitas adsorpsi tertinggi dibandingkan adsorben tanpa aktivasi dan teraktivasi asam. Kata kunci: kulit kacang tanah, ion fosfat, adsorpsi, amonium fosfomolibdat AbstractPeanut shell was used as adsorbent to adsorb phosphate ion in solution. Before using as adsorbent, the peanut shell was washed, dried, mashed and sifted with particle size <100 mesh. The fine powder was activated by acid (H2SO4) and base (NaOH) with various concentrations. Furthermore, the adsorbent with and without activation was used to determine the optimum phosphate concentration that can be adsorbed. The parameters adsorption such as contact time and adsorption capacity, were examined. The adsorption capacity was measured by reacting the phosphate ion with adsorbent, and the rest of analyte in the solution reacted with ammonium molybdate formed ammonium phospho molybdate complex compound whose blue color in acidic solution. The concentration of complex compound can be determined by UV-Visible spectrophotometry method. The results in activation process showed the optimum concentration of acid is 0.05 M, and base is 0.5 M. The optimum contact time obtained 45 minutes for adsorbent without and base activated, while 30 minutes for acid activated. The optimum adsorption capacity is 8.5 mg/g, 8.8 mg/g, and 10.4 mg/g using adsorbent without, acid, and base activated, respectively. Adsorbent in base activated has the highest adsorption capacity compared with no and acid activated. Keywords: peanut shell, phosphate ion, adsorption, ammonium phospho molybdate
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Baimatova, N., M. Derbissalin, A. Kabulov, and B. Kenessov. "Adsorption of Benzene, Toluene, Ethylbenzene and o-Xylene by Carbon-Based Adsorbents." Eurasian Chemico-Technological Journal 18, no. 2 (November 30, 2016): 123. http://dx.doi.org/10.18321/ectj433.
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This study explored the possibility of applying different carbon-based adsorbents for removal of benzene, toluene, ethylbenzene and o-xylene (BTEX) from indoor air in static and dynamic modes. To determine BTEX removal effectiveness, the approach based on solid-phase microextraction (SPME) in combination with gas chromatography – mass spectrometry (GC-MS) was used. In static mode, removal effectiveness of BTEX from indoor air using different carbon-based adsorbents (shungite, walnut shell, saxaul, apricot pits, activated charcoal, Tenax, carbon black) varied from 80% to 100%. Optimal preparation conditions for shungite-based adsorbent are no activation and addition of NaOH at 1:0.8 ratio. Shungite-based adsorbent was not able to remove BTEX from polluted indoor air at the flow rate 300 mL/min corresponding to the linear flow rate 25 cm/s, a minimum value for most commercial air purification systems. At the flow rate 75 mL/min (6.25 cm/s), a saturation time of shungite-based adsorbent made up 368 min for benzene and 437 min for toluene. At this flow rate, BTEX adsorption capacities of the shungitebased adsorbent were 0.3, 2.1, 0.2 and 0.3 μg/g, respectively. Compared to shungite, activated charcoal allowed the complete removal of BTEX at both flow rates in the whole studied time frame. Thus, shungite-based adsorbents are not recommended for BTEX removal from air because of much greater efficiencies of classic activated charcoal adsorbents. Applied methodology based on SPME-GC-MS allowed simple, fast and inexpensive collection of data and can be recommended as the analytical for developing new adsorbents and systems for air purification.
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Chernykh, Oleg Yu, Petr A. Krasochko, Irina A. Krasochko, Aleksey I. Albulov, Viktor N. Dubinich, and Marina V. Dubinich. "Development of complex adsorbent of mycotoxins BIOTOKS." Veterinaria Kubani, no. 1 (February 27, 2020): 19–22. http://dx.doi.org/10.33861/2071-8020-2020-1-19-22.
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Summary. Mycotoxins are secondary low molecular weight metabolites of micromycetes. These compounds most often contaminate feed and products of plant and animal origin. More than 400 mycotoxins have been described, of which 47 are highly toxic. For the prevention of mycotoxicosis of farm animals and poultry in the process of intensive management of animal husbandry, organic, inorganic and complex mycotoxin adsorbents are used. The complexity of adsorption of secondary metabolites of micromycetes is caused by the heterogeneous physicochemical properties of both the mycotoxins (molecular polarity, molecular weight, etc.) and adsorbents. We investigated the general sorption capacities of organic and inorganic components for designing the mycotoxin adsorbent and the «Biotox» complex mycotoxin adsorbent, as well as the degree of adsorption and desorption of regulated mycotoxins when interacting with some modifications of chitosan. As a result of the research, it was found that chitosan succinate (150.13 ± 0.17) and spirulina (142.12 ± 0.10) have the highest total sorption capacity. When determining the level of adsorption of regulated mycotoxins, it was established that all modifications of chitosan effectively bind toxic metabolites of micromycetes. However, based on the results of studies of the total sorption capacity, data on the sorption and desorption of mycotoxins and the dynamics of the processes, chitosan succinate has the best performance. To construct the complex adsorbent of mycotoxins, we used: Tripoli (as a mineral component), chiosan succinate (as an organic adsorbent and at the same time as a prebiotic), lacto-and bifidobacteria to restore the intestinal microflora in mycotoxicosis. Adsorbents with different contents of modified chitosan were developed: 3% and 10%, with a total sorption capacity of 30.04 ± 0.02 mg / g. and 91.3 ± 0.05 mg / g. respectively.
Dissertations / Theses on the topic "Complexe adsorbant"
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Behra, Philippe. "Etude du comportement d'un micropolluant metallique (le mercure) au cours de sa migration a travers un milieu poreux sature : identification experimentale des mecanismes d'echanges et modelisation des phenomenes." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13120.
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Thomas, Fabien. "Mécanismes de rétention à l'interface alumine-solution aqueuse." Nancy 1, 1987. http://www.theses.fr/1987NAN10444.
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Le mécanisme d'adsorption à l'interface alimine-solution aqueuse a été étudié dans le cas de tensioactifs anioniques (alkylbenzènesulfonate de sodium) et de tensioactifs cationiques (chlorure d'alkyldiméthylbenzyl ammonium). Les propriétés structurales, texturales, superficielles des adsorbants ainsi que les propriétés électrochimiques ont été déterminées
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Beghin, Robin. "Etude des conséquences de la digestion anaérobie du maïs sur ses caractéristiques amendantes : devenir des matières organiques, stockage du carbone, vie microbienne, capacité d’adsorption et stabilité structurale de l’horizon de surface de Luvisols cultivés." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0025.
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La filière biogaz est en développement en France et dans plusieurs pays Européen. En conséquence, une part croissante des produits organiques sont digérés en milieu anaérobie avant d’être valorisés agronomiquement. Les effets de la digestion des produits organiques sur leurs propriétés amendantes restent méconnues. Les propriétés amendantes des produits organiques apportés représentent un enjeu important pour la fertilité des Luvisols étudiés qui sont particulièrement dépendants d’une bonne teneur et des flux en matières organiques afin de maintenir leurs qualités chimiques, physiques et biologiques. Ainsi, l’objectif de cette étude est d’évaluer les conséquences des modifications des caractéristiques de produits organiques lors de la digestion anaérobie sur : la vie microbienne, le stockage de carbone, le devenir des matières organiques, la stabilité des agrégats et la capacité d’adsorption de l’horizon de surface de Luvisols cultivés. Durant les incubations, réalisées au champ et en conditions contrôlées, la biodégradation des matières organiques apportées et endogènes par les micro-organismes ont été suivies par la mesure de la production du dioxyde de carbone (CO2) des sols amendés et non amendés puis son traçage grâce aux différences naturelles de l’abondance en isotope du carbone 13 (13C) entre les plantes en C4 et en C3. Ces mesures ont permis de déterminer dans quelles proportions le stockage de C dans les sols induit par l’apport d’un produit organique est induit par la stabilité des matières organiques apportées et par les effets « priming ». A l’issue des incubations, l’analyse de la structure taxonomique des communautés microbiennes actives à partir des composés membranaires phospholipidiques microbiens extraits des sols a été mise en relation avec les effets « priming » observés. Les mesures des teneurs en azote (N) et en phosphore (P) dissous, de la stabilité structurale des agrégats et de la Capacité d’Echange en Cations (CEC) ont permis d’étudier les conséquences agronomiques de l’apport des produits organiques. Ce travail a permis de mieux appréhender la valeur agronomique des digestats de méthanisation en lien avec le devenir des matières organiques dans les sols et de formuler quelques préconisations concernant leur valorisation. Il a également permis de tester l’analyse par pyrolyse Rock Eval des matières organiques apportées et des sols amendés afin d’évaluer la stabilité potentielle des matières organiques apportées et les conséquences de leurs apports sur les caractéristiques des matières organiques des solsThe biogas sector is developing in France and in several European countries. As a result, agrowing proportion of organic products are digested in an anaerobic environment before being used for agricultural purposes. The effects of the anaerobic digestion of organic products on their amending properties remain unclear. The amending properties of the organic products brought in represent an important issue for the fertility of the Luvisols studied, which are particularly dependent on a good content and flow of organic matter in order to maintain their chemical, physical and biological qualities. Thus, the objective of this study is to evaluate the consequences of the modifications of the characteristics of organic products during anaerobic digestion on: microbial life, carbon storage, fate of organic matter, stability of aggregates and adsorption capacity of the surface horizon of cultivated Luvisols. During incubations, carried out in the field and under controlled conditions, the biodegradation of brought and endogenous organic matter by the microorganisms was followed by measuring the production of carbon dioxide (CO2) from amended and unamended soils and then tracing it through natural differences in the abundance of the carbon 13 isotope (13C) between C4 and C3 plants. These measurements determined the extent to which C storage in soils induced by the input of an organic product is induced by the stability of the organic matter input and by priming effects. At the end of the incubations, the analysis of the taxonomic structure of the active microbial communities from the microbial phospholipid membrane compounds extracted from the soils was related to the observed priming effects. Measurements of dissolved nitrogen (N) and phosphorus (P) content, stability of aggregates and Cation Exchange Capacity (CEC) made it possible to study the agronomic consequences of the input of organic products. This work provided a better understanding of the agronomic value of digestates in relation to the fate of organic matter in soils and made it possible to formulate some recommendations concerning their use. It also made it possible to test the Rock Eval pyrolysis analysis of organic matter input and amended soils in order to assess the potential stability of the organic matter input and the consequences of their input on the characteristics of soil organic matter
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Rao, Sumitrananda N. R. "Novel adsorbents using metal complexes." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/10200.
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Mohammed, Saad Abdul Basset. "Caracterisation par spectroscopie ft-ir de l'adsorption et de la reactivite de composes sulfures sur alumine : effet de l'ajout de sodium." Caen, 1986. http://www.theses.fr/1986CAEN2030.
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La spectroscopie ft-ir est appliquee a l'etude des proprietes superficielles d'echantillons d'alumine, a la determination de la nature des especes donnees par l'adsorption de composes soufres et a la recherche des intermediaires de reaction pouvant expliquer le mecanisme du procede de claus. L'addition de na**(+), diminue l'acidite de lewis de l'alumine. L'acidite de broensted induite par la presence des especes sulfate est certainement cause de la desactivation de l'alumine dans la reaction de conversion oxydante de h::(2)s. Cas, aussi, de l'adsorption sur de la silice sodee
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BENAISSA, MOHAMMED. "Etude par spectroscopie infrarouge des proprietes superficielles de l'alumine et des alumines sodees ou fluorees : acidite et basicite." Caen, 1985. http://www.theses.fr/1985CAEN2013.
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Etude des groupes superficiels de l'alumine et des cites d'adsorption. Etude de l'adsorption des alcools sur l'alumine degussa c, des sites d'adsorption et de l'acidite induite. Donnees, enfin, sur les alumines modifiees par des ions na+ ou f-
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Zasada, Ilona. "Théorie de la rétrodiffusion élastique incohérente d'électrons lents par un complexe adsorbat-substrat partiellement ordonné." Lyon 1, 1990. http://www.theses.fr/1990LYO10251.
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Ce travail presente une theorie de la diffusion multiple coherente et incoherente d'electrons lents par une surface monocristalline recouverte d'une couche adsorbee partiellement ordonnee. En meme temps que la theorie de la diffusion multiple, elle met en uvre une description statistique de la couche adsorbee a travers un formalisme d'operateurs nombre d'occupation. Une expression de l'intensite incoherente est obtenue en effectuant les deux approximations suivantes: 1) l'onde incidente effective illuminant un atome est remplacee par sa moyenne sur l'ensemble des configurations; 2) le terme de fluctuation de l'onde retrodiffusee est remplace par son developpement au premier ordre par rapport a la fluctuation de l'amplitude de diffusion de la couche adsorbee. L'intensite incoherente apparait alors comme une forme hermitienne des amplitudes de diffusion effectives des atomes adsorbes dont les coefficients sont les transformees de fourier sur le reseau bidimensionnel des fonctions de correlations de paires. L'etude des intensites incoherentes necessite donc la connaissance des fonctions de correlation de paires. Celles-ci sont etudiees dans le cadre d'une theorie de champ moyen auto-coherent dans laquelle les effets de correlation sont pris en compte a l'aide d'un potentiel d'interaction de paires renormalise. Enfin, un calcul numerique des intensites retrodiffuses par une couche de monoxyde de carbone adsorbee sur la face (111) du platine est effectue. La sensibilite des differents parametres caracterisant l'arrangement des atomes adsorbes par rapport a la maille du reseau 2d de surface et la distribution statistique de ces atomes sont etudies
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Cisneros, Robin. "Production et stockage d'énergie : de la DSSC au photo-accumulateur." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0173.
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L’objectif de ce travail a été de mettre en place un système original capable de produire et stocker l’énergie à partir de la lumière dans un dispositif unique. Pour ce faire, nous avons choisi d’adapter l’électrode photo-sensible d’une DSSC sur un système d’accumulateur électrochimique. La première partie de ce travail a été de mettre en place la technique de spectroscopie EIS-λ, basée sur la spectroscopie d’impédance électrochimique couplée à un balayage en longueur d’onde de la lumière incidente. L’objectif de cette mesure est d’identifier et de quantifier les différents mécanismes de transfert électroniques, photo-dépendant ou non, ayant lieu à la surface de l’électrode photo-sensible, ainsi que les processus de désactivation des états excités des sensibilisateurs. Nous nous sommes ensuite penchés sur la recherche des conditions optimales d’utilisation de deux coadsorbants — l’acide bismethoxyphenyl phosphinique ou BMPP et l’acide chenodesoxycholique ou CDCA — avec le sensibilisateur de référence N719. Nous avons également quantifié leurs activités shield et anti-π-stacking grâce à la technique EIS-λ. Nous avons ainsi réalisé une DSSC présentant un rendement de photo-conversion de 8,3% en utilisant le co-adsorbant BMPP dans un ratio [co-ads]/[S] = 1, contre 7,2% dans les conditions de référence — avec le coadsorbant CDCA utilisé dans un ratio [co-ads]/[S] = 10. Par la suite, nous avons imaginé et synthétisé trois complexes de ruthénium hydrophiles originaux dont nous avons testé le pouvoir de photo-conversion dans des DSSC à électrolyte 100% aqueux, en présence des co-adsorbants sélectionnés. Ces systèmes ont permis de dépasser le pouvoir de photo-conversion du sensibilisateur N719, dans l’eau, avec un rendement maximal obtenu de 1,31%. Enfin, nous avons sélectionné la meilleure combinaison sensibilisateur / co-adsorbant afin de réaliser une électrode photo-sensible que nous avons implémentée dans un système original d’accumulateur électrochimique à base d’électrolytes aqueux. Le système ainsi mis en place constitue aujourd’hui le premier dispositif fonctionnel d’accumulateur 100% aqueux photo-rechargeable à partir d’une électrode mésoporeuse photo-sensibiliséeThe aim of this work was to imagine and to develop a new system able to produce and store energy from sunlight in a single device. For this purpose, the photo-sensitive electrode of a DSSC has been adapted to an electrochemical accumulator. The first part of this work was to develop a new spectroscopic technique, called EIS-λ and based on electrochemical impedance spectroscopy combined to incident light wavelength sweep. This technique has proved its capacity to identify and quantify the different mechanisms of electron transfer over the surface of the semiconducting material and their dependency to incident wavelength, together with the various deactivation processes of the excited state of the sensitizer. Then, we investigated the best conditions to use two different co-adsorbents — namely bis-methoxyphenylphosphinic acid, or BMPP, and chenodesoxycholic acid, or CDCA — with the reference sensitizer N719. The shield and anti-π-stacking activities of the two coadsorbents has been characterized using EIS-λ technique. DSSC with a photo-conversion yield of 8,3% has been prepared in the lab using BMPP in a ratio [co-ads]/[S] = 1 while reference conditions – namely with CDCA in a ratio [co-ads]/[S] = 10 — only gave 7,2%. Besides, we have designed and synthesized three original hydrophilic ruthenium complexes, then tested their photo-conversion properties in DSSC with 100% aqueous electrolytes. Such systems, with the selected co-adsorbents, allowed 1,31% photo-conversion yield to be obtained, which is two times larger than the efficiency exhibited by N719 in the same electrolyte conditions. Finally the best combination sensitizer / co-adsorbent has been selected to achieve a photo-sensitive electrode which has been implemented in an original electrochemical accumulator with aqueous electrolytes. This system represents the first functional device of a 100% aqueous accumulator, which is photo-reloadable with a photosensitized mesoporous electrode
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Duarte, Hélio Anderson. "The nature of metal-adsorbate interactions revealed by density functional calculations on complexes and clusters and by a new embedded cluster approach." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0024/NQ32620.pdf.
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Gonzalez, Ortega Omar. "STUDY AND CHARACTERIZATION OF DUAL-FUNCTION AFFINITY CHROMATOGRAPHIC ADSORBENTS HAVING SIZE EXCLUSION AND ADSORPTION PROPERTIES TO ISOLATE, PURIFY AND RECOVER SMALL BIOMOLECULES FROM COMPLEX BIOLOGICAL MIXTURES." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195896.
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In this work, the main emphasis of the research concerns the development of isolation and purification methods of biomolecules from biological fluids. Several separation techniques were incorporated in chromatographic gels to obtain multifunctional hybrid chromatographic separation media for proteins, peptides and amino acid isolation and purification.In the first part of the research, several chelating agents were synthesized and their effectiveness to purify immunoglobulins using Immobilized Metal Affinity Chromatography (IMAC) was investigated. Ethylenediamine triacetic acid (TED) with immobilized copper resulted in the most effective in terms of purification and protein capacities.The next part of the work involved the development of hybrid chromatographic media that combines protein specific adsorption with sharp controlled size access permeation. This was accomplished by incorporating two types of ligand derivatives, one that permits the permeation of only certain molecular size range compounds, and a second one that specifically binds target biomolecules among the compounds of that specific molecular size range. Hybrid systems included binding ligands for Immobilized Metal Affinity Chromatography (IMAC), Ion Exchange Chromatography (IEX) and Hydrophobic Interaction Chromatography (HIC) combined with a controlled access polymer at different densities such as polyethylene glycol (PEG) and dextran derivatives. In general, low grafting density of high molecular weight PEG was found to be as effective as high grafting density of low molecular weight PEG in the rejecting properties of the semi-permeable synthesized media.Theoretical and experimental batch adsorption studies were also performed with the hybrid media and a mathematical model was developed to study the uptake of proteins under specific conditions of controlled permeation.In the last stage of this work, chelating surfactants were synthesized and used as reversible affinity ligands on reversed phase adsorbents for protein separations.One of the main accomplishments of this research was the development of separation media for small molecular size compounds from larger molecules and from complex biological systems. Applications of special interest will include the isolation and purification of solutes, such as metal ions, toxins, drugs, biomolecules, including proteins, biotoxins, nucleic acids, peptides, hormones, and biomarkers from biological fluids (such as human serum, urine, etc.) and from aqueous solutions.
Books on the topic "Complexe adsorbant"
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Chiou, Wen-An, Helmut Coutelle, Andreas Decher, Michael Dörschug, Reiner Dohrmann, Albert Gilg, Stephan Kaufhold, et al. Bentonites -. Edited by Stephan Kaufhold. E. Schweizerbart Science Publishers, 2021. http://dx.doi.org/10.1127/bentonites/9783510968596.
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<p><b>Bentonites</b> are rocks mostly consisting of swelling clay minerals. They were first described from the Cretaceous Benton Shale near Rock River, Wyoming, USA. </p> <p> Because of their useful properties (e.g. highly adsorbent, cation exchanging, swelling), bentonites have many uses, in industry (among them as drilling mud, purification agent, binder, adsorbent, paper production), culture (for e.g. pottery) and medicine/cosmetics/cat litter, civil engineering, and in the future even in the disposal of high-level nuclear waste. </p> <p> Particular chemical characteristics of bentonite clay minerals are rather variable but critically determine their suitability for a particular application. </p> <p> The 15 specialist authors discuss bentonite terminology, classification and genesis and use in eight chapters. Individual chapters deal with the methods bentonites are analysed with, their properties and performance in terms of parameters such as cation exchange capactiy, rheology, coagulation concentraion, water uptake capacity, free swelling, and electrical resistivity (amongst others). </p> <p> A chapter is dedicated to the sources of bentonites, the technology employed to produce them, and how quality control is carried out both in the mine and the laboratory. A further chapter is dedicated to methods of processing the mined material, different activation methods, drying, grinding, and purification. </p> <P> Use cases for bentonites are discussed in a chapter of its own. References, a section on norms and standards, and a list of abbreviations complete the text. </p> <p> The volume addresses students, researchers, and professionals in the mineral industry dealing with bentonite and their clay-mineral constituents, quality assessement and control, and persons that use bentonites in their products. </p>
Book chapters on the topic "Complexe adsorbant"
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Leboda, R., A. Gierak, B. Charmas, and Z. Hubicki. "Complex Carbon-Silica Adsorbents: Preparation, Properties and Some Applications as Model Adsorbents." In The Kluwer International Series in Engineering and Computer Science, 497–504. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_62.
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Micha, D. A., A. Leathers, and B. Thorndyke. "Density Matrix Treatment of Electronically Excited Molecular Systems: Applications to Gaseous and Adsorbate Dynamics." In Quantum Dynamics of Complex Molecular Systems, 165–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-34460-5_7.
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Selvaraj, Bagampriyal, and Sadhana Balasubramanian. "Formulations of BGA for Paddy Crop." In Agroecosystems – Very Complex Environmental Systems. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92821.
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Blue green algae (BGA) are prokaryotic phototrophic organisms that can fix the atmospheric nitrogen biologically, and were directly applied as a biofertilizers in agricultural fields specifically Paddy field. Since they are having the ability to fix nitrogen, they are formulated with various adsorbents for the purpose of enhancing the crop growth along with maintaining the soil fertility and other soil factors responsible for productivity. The present study revealed that the formulations of blue green algae isolated from paddy fields of southern districts with different adsorbents like alluvial soil, sand, charcoal, and powdered paddy straw. All the adsorbents mixed with blue green algae showed significant growth when compared to the control plant. This determined that the adsorbent formulated mixed blue green algae enhanced the paddy plant growth under greenhouse condition.
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Shikuku, Victor O., Chispin O. Kowenje, and Wilfrida N. Nyairo. "Fundamentals and Sources of Magnetic Nanocomposites and Their Sorption Properties." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 636–55. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch028.
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Over the years, adsorption has been the most widely applied technique for pollutants remediation in conventional water and wastewater treatment regimes with commendable results. Consequently, multiple adsorbents have been synthesized, characterized and tested for various pollutants sequestration such as; heavy metals, dyes, pharmaceutically active ingredients, among others, in aqueous media. Unfortunately, most of the sorbents face many inherent limitations such as high production cost, difficult separation of adsorbent from solution, and complex synthesis processes. Therefore, an efficient adsorbent that would be sustainably adopted for industrial application in wastewater treatment requires, among other properties, a simple and efficient recovery step from a continuous flowing system. The regenerated adsorbent must also possess near original properties after several cycles of reuse thereby resulting to low capital investment. To address this challenge, studies conducted in the past few years incorporating magnetism in both natural and synthetic sorbents to improve their removal from water via magnetic separation have yielded stupendous results compared to conventional technologies. This chapter concisely discusses synthesis methods and adsorption capacities and mechanisms of selected magnetic nanocomposite adsorbents under diverse physicochemical conditions for removal of cations, dyes and organic pollutants from wastewater. Magnetic nanocomposites present eco-friendly properties and are potential alternatives for application in water purification processes subject to commercial viability evaluation before practical use.
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Kashima, Keita, Tomoki Takahashi, Ryo-ichi Nakayama, and Masanao Imai. "Innovative Separation Technology Utilizing Marine Bioresources: Multifaceted Development of a Chitosan-Based System Leading to Environmentally-Friendly Processes." In Chitin and Chitosan - Physicochemical Properties and Industrial Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95839.
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Chitosan, known as a most typical marine biological polymer, has a fruitful capability of biocompatible gel formation. Attempts of chitosan have been made to develop it from the multifaceted viewpoint of separation technology. The physicochemical properties of chitosan containing a lot of hydroxyl groups and reactive amino groups help to build the characteristic polymer networks. The deacetylation degree of chitosan is found as the most influential factor to regulate properties of chitosan hydrogels. The antibacterial activity of the chitosan membrane is one of its notable abilities because of its practical application. The chitosan, its derivatives, and the complex formation with other substances has been used for applications in filtration and membrane separation processes. Adsorption processes based on chitosan have been also developed widely. Moreover, complex of chitosan gel helps to immobilize adsorbent particles. The chitosan membrane immobilizing Prussian-Blue for cesium ion removal from the aqueous phase is one of the leading cases. To elaborate the adsorption behavior on the chitosan immobilizing adsorbent, the isothermal equilibrium and mass transfer characteristics can be discussed. The adsorption process using chitosan-based membranes in combination with filtration in a flow process is advantageous compared with the batch process. More advanced studies of chitosan aerogel and chitosan nanofibers have been proceeded recently, especially for adapting to water purification and air filtration.
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Schmickler, Wolfgang. "Adsorption on metal electrodes." In Interfacial Electrochemistry. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195089325.003.0009.
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Whenever the concentration of a species at the interface is greater than can be accounted for by electrostatic interactions, we speak of specific adsorption. It is usually caused by chemical interactions between the adsorbate and the electrode, and is then denoted as chemisorption. In some cases adsorption is caused by weaker interactions such as van der Waals forces; we then speak of physisorption. Of course, the solvent is always present at the interface; so the interaction of a species with the electrode has to be greater than that of the solvent if it is to be adsorbed on the electrode surface. Adsorption involves a partial desolvation. Cations tend to have a firmer solvation sheath than anions, and are therefore less likely to be adsorbed. The amount of adsorbed species is usually given in terms of the coverage θ, which is the fraction of the electrode surface covered with the adsorbate. When the adsorbate can form a complete monolayer, θ equals the ratio of the amount of adsorbate present to the maximum amount that can be adsorbed. In a few systems the area covered by a single adsorbed molecule changes with coverage; for example, some organic molecules lie flat at low coverage and stand up at higher coverages. In this case one must specify to which situation the coverage refers. Another definition of the coverage, often used in surface science, is the following: θ is the ratio of the number of adsorbed species to the number of surface atoms of the substrate. Fortunately, most authors state which definition they use. The chemisorption of species occurs at specific sites on the electrode, for example on top of certain atoms, or in the bridge position between two atoms. Therefore, most adsorption studies are performed on well-defined surfaces, which means either on the surface of a liquid electrode or on a particular surface plane of a single crystal. Only fairly recently have electrochemists learned to prepare clean single crystal electrode surfaces, and much of the older work was done on mercury or on amalgams.
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"State-of-the-Art Materials for Adsorptive Heat Energy Conversion." In Technology Development for Adsorptive Heat Energy Converters, 1–24. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4432-7.ch001.
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The chapter is focused on state of the art of materials for adsorptive heat energy conversion basic principles for substantiation of working pair choice. Types of heat storage materials based on heat storage mechanism were compared. Sensible heat mechanism of thermal energy is based on increasing the temperature of the material. Phase-change mechanism of heat energy storage concerns with alternating reversible processes of phase-changing. As a rule, they are mainly melting-crystallization. Thermo-chemical heat energy storage mechanism is based on reversible chemical reactions. Limitations of conventional sensible heat storage are shown to lowest density of heat energy storage determined by sensible heat of materials, which led to large mass storage units and additional needs of large areas and building volumes, calculated according to heat storage density, constant changing the temperature when discharged, the need for a large overheating of heat storage media. The main defects of phase-change materials are instability of properties of heat-accumulating substances in multiple cycles of crystallization – melting, degradation in time, corrosion activity, the need for developed surfaces of heat exchange and environmental danger. Commercilisation of thermal chemical storage materials is strongly limited by high operating temperatures of thermal chemical storage materials, which are unacceptable for systems of district heating and decentralized heat supply due to sanitary regulations, impropriety for multifold cycling because of irreversibility of a wide range of chemical reactions. Perspective of adsorptive heat energy storage and conversion is shown. Interval of operating temperatures and heat storage density of conventional adsorptive materials are shown to be intermediate between phase-change and thermal chemical heat storage materials. Properties of probable adsorptive heat storage materials were analysed according with literary data. Low adsorptive capacity of conventional adsorbents results in low heat of adsorption and heat energy storage density. Salts forming crystalline hydrate occur to exhibit rather high energy storage density of 1.9–2.7 GJ/m3 of crystalline hydrate, but their application is strongly inhibited not only by physical and chemical instability along with the corrosive activity of these salts at high temperatures, but instability in multifold cycling, degradation in time, and an underdeveloped heat exchange surface. As engineering solution, modification of conventional adsorbents with salt can be considered. Composites ‘salt inside porous matrix' is shown to be promising alternative to conventional adsorbents. Main advantages of these materials are low regeneration temperature and high adsorptive capacity. Crucial impediments of industrial introduction of composite adsorbents ‘salt inside porous matrix' is shown to be complex technology of their production based on rather expensive dry and wet impregnation of porous media by crystalline hydrate solutions. As an alternative, sol gel method for obtaining composite adsorbents ‘silica gel – crystalline hydrate' developed by authors is suggested. The adsorption properties of the obtained composite adsorbents ‘silica gel – sodium sulphate' and ‘silica gel – sodium acetate' are shown to be non-linear combinations of characteristics of silica gel and massive salt. The key distinction of kinetics of adsorption of water vapor with massive salts and composites obtained with sol gel method is shown to be difference limitative stage of process. The adsorption of water with massive crystalline hydrates is shown to be complicated by kinetic limitations. For composite adsorbents limiting stage is water transport through the pore system. Composites ‘slilica gel – crystalline hydrate' are shown to be a promising material for adsorptive heat energy storage and conversion.
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Leboda, R., and A. Dąbrowski. "Chapter 1.5 Complex carbon-mineral adsorbents: preparation, surface properties and their modification." In Adsorption on New and Modified Inorganic Sorbents, 115–46. Elsevier, 1996. http://dx.doi.org/10.1016/s0167-2991(06)81019-0.
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Alexander, Cameron, and Nicole Kirsch. "New methodologies in the preparation of imprinted polymers." In Polymer Chemistry. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198503095.003.0013.
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Molecular imprinting is a rapidly emerging method for the creation of recognition sites in synthetic polymers, and the resultant materials offer considerable promise as selective adsorbents in a number of applications. The technique exploits the principle of using elements of a target molecule to create its own recognition site. This is achieved by the formation of a highly cross-linked polymeric matrix around a template, which can be the target molecule itself or a close structural analogue. The key to this procedure is to ensure that, during the polymerization, functional groups of the template molecule are fully engaged in interactions with ‘complementary functionality’ of polymer-forming components. These interactions are then ‘locked in’ by the incorporation of the whole assembly into the polymer structure. Subsequent removal of the template reveals the newly created binding sites containing functional groups in the precise stereochemical arrangement to ensure recognition of the target in a highly selective manner (Scheme 1). The first reports of molecular imprinting in organic polymers involved the templating of protected sugars, in the form of esters with a polymerizable boronic acid (however, see Ref. 18 for an earlier example of the imprinting concept) into a cross-linked polymer ‘scaffold’, and variations of the basic technique have now been adopted by many research groups around the world. In general, molecularly imprinted polymers (MIPs) are prepared by thermal or photochemical free-radical routes, employing acrylic or vinylic monomers in a solvent chosen to ensure that the final matrix is microporous. The numbers and types of molecules which have now been imprinted is very large, but a key factor in the preparation of MIP materials with the desired recognition properties is still the chemical nature of the link between the template and the polymer backbone. Consequently, strategies by which the template can be securely fixed in space as the growing matrix forms around it, yet be readily removed to generate the recognition site after polymer synthesis is complete, are of particular interest.
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Yu, T. R. "Introduction." In Chemistry of Variable Charge Soils. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097450.003.0004.
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The constitution and properties of soils have their macroscopic and microscopic aspects. Macroscopically, the profile of a soil consists of several horizons, each containing numerous aggregates and blocks of soil particles of different sizes. These structures are visible to the naked eye. Microscopically, a soil is composed of many kinds of minerals and organic matter interlinked in a complex manner. In addition, a soil is always inhabited by numerous microorganisms which can be observed by modern scientific instruments. To study these various aspects, several branches of soil science, such as soil geography, soil mineralogy, and soil microbiology, have been developed. If examined on a more minute scale, it can be found that most of the chemical reactions in a soil occur at the interface between soil colloidal surface and solution or in the solution adjacent to this interface. This is because these colloidal surfaces carry negative as well as positive charges, thus reacting with ions, protons, and electrons of the solution. The presence of surface charge is the basic cause of the fertility of a soil and is also the principal criterion that distinguishes soil from pure sand. The chief objective of soil chemical research is to deal with the interactions among charged particles (colloids, ions, protons, electrons) and their chemical consequences in soils. As depicted in Fig. 1.1, these charged particles are closely interrelated. The surface charge of soil colloids is the basic reason that a soil possesses a series of chemical properties. At present, considerable knowledge has been accumulated about the permanent charge of soils. On the other hand, our understanding is still at an early stage about the mechanisms and the affecting factors of variable charge. The quantity of surface charge determines the amount of ions that a soil can adsorb, whereas the surface charge density is the determining factor of adsorbing strength for these ions. Because of the complexities in the composition of soils, the distribution of positive and negative charges is uneven on the surface of soil colloidal particles. Insight into the origin and the distribution of these charges should contribute to a sound foundation of the surface chemistry of soils.
Conference papers on the topic "Complexe adsorbant"
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Rubanov, Yury, Yury Rubanov, Yulia Tokach, Yulia Tokach, Marina Vasilenko, Marina Vasilenko, Elena Goncharova, and Elena Goncharova. "CLEANING UP EMERGENCY OIL SPILLS FROM THE WATER SURFACE WITH MAGNETIC ADSORBENTS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315da403d.
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There was suggested a method of obtaining a complex adsorbent with magnetic properties for the oil spill clean-up from the water surface by means of controlled magnetic field. As magnetic filler a finely-dispersed iron-ore concentrate in the form of magnetite, obtained by wet magnetic separation of crushed iron ore, was suggested. As an adsorbing component the disintegrating electric-furnace steelmaking slag, obtained by dry air-cooling method, was selected. The mass ratio of components slag:magnetite is 1(1,5÷2,0). For cleaning up emergency oil spills with the suggested magnetic adsorbent a facility, which is installed on a twin-hulled oil recovery vessel, was designed. The vessel contains a rectangular case between the vessel hulls with inlet and outlet for the treated water, the bottom of which is a permanently moving belt. Above the belt, at the end point of it there is an oil-gathering drum with magnetic system. The adsorbent is poured to oil-products layer from a hopper, provided with drum feeder. Due to the increased bulk weight the adsorbent sinks rapidly into the oil layer on the water surface. If the large non-floating flocculi are formed, they sink and sedimentate on the moving belt and are moved to the oil-gathering drum. The saturated adsorbent is removed from the drum surface with a scraper, connected with a gutter, with contains a rotating auger.
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Rubanov, Yury, Yury Rubanov, Yulia Tokach, Yulia Tokach, Marina Vasilenko, Marina Vasilenko, Elena Goncharova, and Elena Goncharova. "CLEANING UP EMERGENCY OIL SPILLS FROM THE WATER SURFACE WITH MAGNETIC ADSORBENTS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93c71c15e4.50364588.
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There was suggested a method of obtaining a complex adsorbent with magnetic properties for the oil spill clean-up from the water surface by means of controlled magnetic field. As magnetic filler a finely-dispersed iron-ore concentrate in the form of magnetite, obtained by wet magnetic separation of crushed iron ore, was suggested. As an adsorbing component the disintegrating electric-furnace steelmaking slag, obtained by dry air-cooling method, was selected. The mass ratio of components slag:magnetite is 1(1,5÷2,0). For cleaning up emergency oil spills with the suggested magnetic adsorbent a facility, which is installed on a twin-hulled oil recovery vessel, was designed. The vessel contains a rectangular case between the vessel hulls with inlet and outlet for the treated water, the bottom of which is a permanently moving belt. Above the belt, at the end point of it there is an oil-gathering drum with magnetic system. The adsorbent is poured to oil-products layer from a hopper, provided with drum feeder. Due to the increased bulk weight the adsorbent sinks rapidly into the oil layer on the water surface. If the large non-floating flocculi are formed, they sink and sedimentate on the moving belt and are moved to the oil-gathering drum. The saturated adsorbent is removed from the drum surface with a scraper, connected with a gutter, with contains a rotating auger.
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Drachev, Vladimir P., Won-Tae Kim, Eldar N. Khaliullin, Fedda Al-Zoubi, Viktor A. Podolskiy, Vladimir P. Safonov, Vladimir M. Shalaev, and Robert L. Armstrong. "Discrete spectrum of anti-Stokes emission from metal particle-adsorbate complexes in a microcavity." In XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), edited by Anatoly V. Andreev, Pavel A. Apanasevich, Vladimir I. Emel'yanov, and Alexander P. Nizovtsev. SPIE, 2002. http://dx.doi.org/10.1117/12.468975.
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Hastuti, Budi, and Dwi Siswanta. "Kinetic and Thermodynamic Modified Pectin with Chitosan by Forming Polyelectrolit Complex Adsorbent to Remediate of Pb(II)." In 2nd International Conference on Applied Research in Engineering Science and Technology. Acavent, 2019. http://dx.doi.org/10.33422/2nd.arset.2019.09.529.
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Tamburello, David, Bruce Hardy, and Martin Sulic. "Multi-Component Separation and Purification of Natural Gas." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7537.
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Over the past decade, several technical developments (such as hydraulic fracturing) have led to an exponential increase in discovering new domestic natural gas reserves. Raw natural gas composition can vary substantially from source to source. Typically, methane accounts for 75% to 95% of the total gas, with the rest of the gas containing ethane, propane, butane, other higher hydrocarbons, and impurities, with the most common including H2O, CO2, N2, and H2S. All natural gas requires some treatment, if only to remove H2O; however, the composition of natural gas delivered to the commercial pipeline grids is tightly controlled. Sub-quality natural gas reserves, which are defined as fields containing more than 2% CO2, 4% N2, or 4 ppm H2S, make up nearly half of the world’s natural gas volume. The development of sub-quality, remote, and unconventional fields (i.e. landfill gas) can present new challenges to gas separation and purification methods. Adsorbent technologies, such as the use of activated carbons, zeolites, or metal-organic frameworks (MOFs), may hold the key to more efficient and economically viable separation methods. This work proposes to prove the applicability of the multi-component potential theory of adsorption (MPTA) to a real world natural gas adsorbent system to properly characterize the adsorbent’s selectivity for an individual gas component using only the single component isotherms. Thus, the real-world gas separation/purification application of a specific adsorbent for a given gas stream can be obtained simply and effectively without the need for large experimental efforts or costly system modifications until after an initial computational screening of perspective materials has been completed. While the current research effort will use natural gas, which is the world’s largest industrial gas separations application, to validate the MPTA, the tools gained through this effort can be applied to other gas separation effort.
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Hastuti, Budi, Mudasir, Dwi Siswanta, and Triyono. "The preparation of polyelectrolyte complexes carboxymethyl chitosan(CMC)-pectin by reflux method as a Pb (II) metal ion adsorbent." In PROCEEDINGS OF INTERNATIONAL SEMINAR ON MATHEMATICS, SCIENCE, AND COMPUTER SCIENCE EDUCATION (MSCEIS 2015). AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4941487.
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Mimura, Hitoshi, Minoru Matsukura, Tomoya Kitagawa, Fumio Kurosaki, Akira Kirishima, Daisuke Akiyama, and Nobuaki Sato. "Evaluation of Adsorption Properties of U(VI) for Various Inorganic Adsorbents." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81338.
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Large amounts of highly contaminated water over 800,000 m3 accumulated in the reactor, turbine building and the trench in the facility were generated from the nuclear accident of Fukushima NPS (BWR) caused by the Great East Japan Earthquake. At present, the cold shutdown is completed stably by the circulating injection cooling system (SARRY, KURION) for the decontamination of radioactive nuclides such as 134Cs and 137Cs using zeolites and crystalline silicotitanate (CST). Further, the Advanced Liquid Processing System (ALPS) is under operation for the decontamination of 62 nuclides such as 90Sr, 129I and 60Co, etc. However, the adsorption behaviors of actinoids through the decontamination systems are complicated, and especially their adsorption properties for zeolites and CST, major inorganic adsorbents, are not yet clarified. In near future, the decontamination of actinoids leached from the crushed fuel debris will be an important subject. In this study, the practical adsorption properties of U(VI) for various inorganic adsorbents were evaluated under different solution conditions. The adsorption properties (distribution behaviors and adsorption kinetics) were evaluated by batch adsorption method; 19 kinds of inorganic adsorbents including zeolites and CST (crystalline silicotitanate) were contacted with U(VI)) solutions. The conditions of 5 kinds of U(VI) solutions were as follows; Solution 1: [U(VI)] = 50 ppm, initial pH = 0.5 ∼ 5.5 Solution 2: [U(VI)] = 50 ppm, [NaCl] = 0.1 M, initial pH = 4.0 Solution 3: [U(VI)] = 50 ppm, [CaCl2] = 0.1 M, initial pH = 4.0 Solution 4: [U(VI)] = 4.84 mM, [NaCl] = 0.1 M, initial pH = 3.18 Solution 5: [U(VI)] = 4.86 mM, 2,994 ppm boric acid/30% seawater, initial pH = 4.25 The uptake (%) and distribution coefficient (Kd. cm3/g) were estimated by counting the radioactivity using NaI(Tl) scintillation counter and liquid scintillation counter. In the simple Solution 1, the Kd values for zeolites increased linearly with equilibrium pH up to pH 7. The Kd value for tin hydroxide had a maximum profile around pH 7 and a relatively large Kd value above 104 cm3/g was obtained. In the presence of NaCl and CaCl2 (Solution 2 and 3), relatively large Kd values above 102 cm3/g were obtained, other than mordenite and clinoptilolite, and the effect of [Ca2+] on U(VI) uptake was larger than that of [Na+]. In Solution 4 containing high concentration of U(VI), the uptake(%) was considerably lowered, while that for zeolite A, X and Y was estimated over 20%. Similar tendency was observed in Solution 5, and, in the case of granulated potassium titanate, yellow precipitate was observed on the surface due to the increase of equilibrium pH up to 5.25. The adsorption behavior of U(VI) on inorganic adsorbents is mainly governed by three steps; ion exchange, surface precipitation of hydrolysis species and sedimentation depending on equilibrium pH, and hence it should be noted the change of U(VI) chemical species. These basic adsorption data are useful for the selection of inorganic adsorbents in the Fukushima NPS decontamination process.
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Chabbat, J., L. Pejaudier, V. Kichenin-martin, S. Hampikian-Le Nin, and M. Steinbuch. "PROPERTIES OF A F VII CONCENTRATE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643282.
Full textAbstract:
A concentrate of factor VII obtained by adsorption onto an inorganic adsorbent using a by-product of routine fractionation as starting material This fraction contains only small amounts of the other constituents of the prothrombin complex ( PC ) but it is enriched in proteins C and S. It contains much less VIII CAg than the usual even activated PC concentrates. The amounts of isoagglutinins anti-A and B have also been checked. The concentrate of partially versus completely activated factor VII ( by factor Xlla ) has been submitted to animal experiences including those effected on hemophilic dogs. The concentrate and highly purified factor VII prepared from it were checked on a serie of chromogenic substrates and inhibitors of proteolytic enzymes of plasmatic and other origin. The results obtained are compared with those given by the two most commonly used activated PCCs. The correlation between active F VII and by-passing activity has been studied. This concentrate might thus be indicated for the treatment of hemophilia A-patients with inhibitors.
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Camargo, Carolina, and Ana Cantu. "Development of a CE-UV methodology for the evaluation of the addition of adsorbents in animal feed for the removal of mycotoxins: effect on the levels of B-complex vitamins." In Congresso de Iniciação Científica UNICAMP. Universidade Estadual de Campinas, 2019. http://dx.doi.org/10.20396/revpibic2720192801.
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Huenchen, H., L. Pachmayer, and O. Malerius. "Design and Commissioning of the Largest and the Smallest Fluidized Bed Incinerator Ever Built by Lurgi." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-007.
Full textAbstract:
Since communities and companies are deciding to dispose sludges of different origin in a safe and nonpolluting way, more and more sludge is burnt either in mono-combustion or co-combustion units. Lurgi Energie und Entsorgung GmbH, one of the most experienced fluidized bed designer, is commissioning two bubbling bed incinerators of totally different incinerator size in 2002. In France the smallest fluidized bed incinerator ever built by Lurgi with a cross-sectional bed area of 4 m2 is designed to burn 750 kg (d.m.)/h sewage sludge. In spite of the small size it consists of all equipment necessary for sewage sludge incineration, including a disc dryer, a thermal oil boiler for heat recovery and a complete state of the art flue gas cleaning system. Air pollutants are removed in a circulating fluidized bed adsorber (CFB) designed in accordance with the new Lurgi CIRCOCLEAN® process. In United Kingdom the largest bubbling bed incinerator ever built by Lurgi with a cross-sectional bed area of 32 m2 is going to start its operation in 2002. The plant burns a mixture of thickened and mechanically dewatered primary and secondary sludge and different plastic residues from waste paper recycling plants. In order to provide sufficient disposal capacity of the waste material generated at the Kemsley Paper Mill site some parts of the installation consist of parallel streams or units (e. g. waste material handling and storage). The overall design throughput rate of mixed waste material is 22.8 t(a.r.)/h, corresponding to a thermal load of 29.1 MW. Due to the specific properties of the paper sludge, the formed ash can be used as an adsorbent/reactive compound for the capture of acidic pollutants. The flue gas cleaning system consists of a zeolite dosing unit to remove dioxins/furanes upstream of a baghouse filter. The paper presents the main design parameters of both disposal facilities and peculiarities of the burnt materials in comparison to other sludges. Since the plants are still in the commissioning phase only problems that might occur during the operation of the plant and tendencies in the operation behavior are described.
Reports on the topic "Complexe adsorbant"
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Janke, Chris, Oyola Yatsandra, Richard Mayes, none,, Gary Gill, Kuo Li-Jung, Jordana Wood, and Das Sadananda. Complete braided adsorbent for marine testing to demonstrate 3g-U/kg-adsorbent. Office of Scientific and Technical Information (OSTI), April 2014. http://dx.doi.org/10.2172/1148692.
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Janke, Christopher, Sadananda Das, Yatsandra Oyola, Richard Mayes, Tomonori Saito, Suree Brown, Gary Gill, Li-Jung Kuo, and Jordana Wood. Milestone Report - Complete New Adsorbent Materials for Marine Testing to Demonstrate 4.5 g-U/kg Adsorbent. Office of Scientific and Technical Information (OSTI), August 2014. http://dx.doi.org/10.2172/1162052.
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