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Journal articles on the topic 'Isotherms and Chemisorption'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Masthan, S. Khaja, K. S. Rama Rao та P. Kanta Rao. "The Influence of Metal Loading on the Structure-sensitive Chemisorption of Nitrogen on Ru/γ-Al2O3 Catalysts". Adsorption Science & Technology 11, № 3 (1994): 175–85. http://dx.doi.org/10.1177/026361749401100305.

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Nitrogen chemisorption has been studied on five Ru/γ-Al2O3 catalysts ranging in Ru loading from 0.5–5.0 wt.% at different temperatures from 25°C to 300°C and at different pressures up to 1 atm in order to obtain an insight into the influence of the morphological structure of ruthenium on the amount and nature of nitrogen chemisorption. The chemisorption of N2 at ambient temperature increased steadily with pressure on all the catalysts studied so that the resulting isotherms were straight lines. When the adsorption temperature was raised, N2 chemisorption decreased and the corresponding isother

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Taranko, E., R. Cardenas, R. Taranko, and V. K. Fedyanin. "Chemisorption Isotherms for Ising Anderson Hamiltonian." Acta Physica Polonica A 86, no. 6 (1994): 917–27. http://dx.doi.org/10.12693/aphyspola.86.917.

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Caputo, Maricel, Francisca Aparicio, Sergio Laurella, and María de las Mercedes Schiavoni. "Argentinian Sugar Cane Vinasse: Characterization of Phenolic Compounds and Evaluation of Adsorption as a Possible Remediation Technique." Chemistry & Chemical Technology 16, no. 3 (2022): 484–91. http://dx.doi.org/10.23939/chcht16.03.484.

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Chemical composition of sugar cane vinasse (Tucumán, Argentina) was studied finding high concentration of organic compounds. Phenolic compounds were partially characterized, finding mostly flavonoids, anthocyanins, as well as resorcinol and ferulic acid derivatives. Adsorption isotherms of phenolic compounds and total organic compounds were measured on four commercial activated carbons with different physical and chemical properties at two temperatures. The isotherm shape depends on the type of carbon and the adsorption capacity is enhanced as temperature increases. Enthalpies of the adsorptio

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Starke, Annika, Christoph Pasel, Christian Bläker, Tobias Eckardt, Jens Zimmermann, and Dieter Bathen. "Impact of Na+ and Ca2+ Cations on the Adsorption of H2S on Binder-Free LTA Zeolites." Adsorption Science & Technology 2021 (May 29, 2021): 1–12. http://dx.doi.org/10.1155/2021/5531974.

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Hydrogen sulfide is removed from natural gas via adsorption on zeolites. The process operates very effectively, but there is still potential for improvement. Therefore, in this article, the adsorption of hydrogen sulfide was investigated on eight LTA zeolites with different cation compositions. Starting with the zeolite NaA (4 A), which contains only Na+ cations, the Ca2+ cation content was gradually increased by ion exchange. Equilibrium isotherms from cumulative breakthrough curve experiments in a fixed-bed adsorber at 25°C and 85°C at 1.3 bar (abs.) were determined in the trace range up to

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Chen, Jun Tao, Yue Xin Han, Shu Fang Ding, and Shui Lin Zheng. "The Adsorption Performance Study of Acid Leaching Residue of Asbestos Tailings." Materials Science Forum 685 (June 2011): 246–52. http://dx.doi.org/10.4028/www.scientific.net/msf.685.246.

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Acid leaching residue of asbestos tailings was calcined at 600°C. N2adsorption and desorption isotherms of this modified mineral material were measured at low temperature and the adsorption characteristic of acid leaching residue as well as the mechanism were discussed. The specific surface area of acid leaching residue was calculated by BET model, and meanwhile micropore and mesopore structural parameters were calculated by means of ‘t-Plot’ and BJH theory, respectively. The results showed that the N2adsorption-desorption isotherms of acid leaching residue were in line withⅠpattern of the IUP

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Porubská, Mária, Karin Koóšová, and Jana Braniša. "Competitive Cation Adsorption on Electron-Irradiated Sheep Wool Changes the Fitting of Adsorption Isotherms for Single-Component Solutions." Processes 11, no. 2 (2023): 502. http://dx.doi.org/10.3390/pr11020502.

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This work analyses 10 adsorption isotherm models applied to adsorption of Cr(III) and Cu(II) from binary solutions on electron-irradiated sheep wool (0-24-100) kGy. The results are compared with fitting the same adsorbates from corresponding single solutions. The competing cation significantly changes the fitting of the selected isotherms to the extent that even simultaneous fitting of the same cation in the single and binary solution is rare. In the case of Cr(III), 4 favourable matches were found out of 30 compared cases, while in the case of Cu(II), only 2 conformities were found. Having th

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Taranko, E. "Chemisorption isotherms in a generalized lattice gas model." physica status solidi (b) 195, no. 2 (1996): K5—K8. http://dx.doi.org/10.1002/pssb.2221950233.

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8

Ugbe, Fabian Audu, Patrick Onuh Anebi, and Victoria Abiola Ikudayisi. "Biosorption of an Anionic Dye, Eosin Yellow onto Pineapple Peels: Isotherm and Thermodynamic Study." International Annals of Science 4, no. 1 (2018): 14–19. http://dx.doi.org/10.21467/ias.4.1.14-19.

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Eosin Yellow (EY), an anionic dye (acid dye) was adsorbed using an agricultural waste, pineapple peels (PP) as bio-sorbent in order to investigate its suitability as an alternative adsorbent, and to give insight into the mechanisms of binding. The study includes: equilibrium isotherms and thermodynamics studies. The adsorption isotherm and thermodynamics experiments were conducted using batch equilibrium techniques. The adsorption data were fitted into Langmuir, Freundlich and Temkin isotherm models; as a result, the data fitted well into the Langmuir model from which the adsorption capacity,

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Woods, R., Z. Chen, and R. H. Yoon. "Isotherms for the chemisorption of ethyl xanthate on lead." International Journal of Mineral Processing 50, no. 1-2 (1997): 47–52. http://dx.doi.org/10.1016/s0301-7516(96)00030-0.

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10

Güleç, Fatih, Orla Williams, Abby Samson, Emily T. Kostas, Lee A. Stevens, and Edward Lester. "Exploring the Utilisation of Natural Biosorbents for Effective Methylene Blue Removal." Applied Sciences 14, no. 1 (2023): 81. http://dx.doi.org/10.3390/app14010081.

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This paper presents a comprehensive analysis of the adsorbent capacity of five distinctly different biosorbents derived from untreated biomasses. The optimal adsorption capacity of seaweed (Laminaria digitata), horse chestnut husk, hazelnut husk, rapeseed residue, and whitewood to remove methylene blue (MB) dye was assessed by analysing the effects of particle size, pH, temperature, and initial dye concentrations. Furthermore, the adsorption kinetics, isotherms, and adsorption thermodynamics were investigated. The results showed that relatively high MB adsorption capacity was achieved by Lamin

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Rey, L., R. Martino, L. Gambaro, and H. Thomas. "Studies on the V2O5-TiO2 System. IV. Oxygen Chemisorption." Adsorption Science & Technology 5, no. 4 (1988): 280–88. http://dx.doi.org/10.1177/026361748800500403.

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The chemical adsorption of oxygen on V2O5 and V2O5 -TiO2 over the temperature range 100–450°C and at pressures between 10−2 and 3 Torr has been studied. Assays have been performed using a volumetric method, the isotherms obtained being in accordance with Langmuir's adsorption model. Isobaric plots at 1.5 Torr of these isotherms exhibit two maxima, at 250 and 400°C, respectively. These maxima have been interpreted in terms of the surface chemisorption of O2− and its diffusion into the bulk solid. The amount adsorbed at the 250°C maximum depends on the sample composition in the following decreas

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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 (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 adso

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Kovalenko, V., A. Borysova, I. Pliuta, and R. Likhnovsky. "ADSORPTION AS A BASIS OF PROTECTIVE ACTION OF FILTERS-ADSORBER." Науковий вісник: Цивільний захист та пожежна безпека 1, no. 2 (2018): 59–63. http://dx.doi.org/10.33269/nvcz.2018.2.59-63.

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This article analyzes the regulatory documents on determination of protective action time of gas filters and FILTERS-ADSORBER, which are designed for individual and collective protection. The current absence of a current regulatory document in Ukraine is indicated according to which protective action time of filters is determined, adds relevance in the implementation of the method of determining this filter characteristic. The theoretical aspects of effect of absorbing capacity of filters are highlighted, the fundamental principles of adsorption are linked with the time of protective action ti

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Holliman, Peter J., Beatriz Vaca Velasco, Ian Butler, Maarten Wijdekop, and David A. Worsley. "Studies of Dye Sensitisation Kinetics and Sorption Isotherms of Direct Red 23 on Titania." International Journal of Photoenergy 2008 (2008): 1–7. http://dx.doi.org/10.1155/2008/827605.

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Sorption kinetics and isotherms have been measured for a commercial dye (Direct Red 23) on different samples of powdered Titania, and the data were analysed to better understand the dye sensitization process for dye sensitised solar cells (DSSCs). For the sorption kinetics, the data show rapid initial sorption (<1 hour) followed by slower rate of increasing uptake between 1 and 24 hours. While higher initial concentrations of dye correspond to higher sorption overall, less dye is absorbed from higher initial dye concentrations when considered as percentage uptake. The correlation between th

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Contreras Olivares, N., M. C. Díaz-Nava, and M. Solache-Ríos. "Enhanced decolorization of dyes by an iron modified clay and thermodynamic parameters." Water Science and Technology 73, no. 8 (2016): 2007–16. http://dx.doi.org/10.2166/wst.2016.038.

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The sorption processes of red 5 (R5) and yellow 5 (Y5) dyes by iron modified and sodium bentonite in aqueous solutions was evaluated. The modified clay was prepared, conditioned and characterized. The sodium clay did not remove any of either dye. The sorption kinetics and isotherms of R5 and Y5 dyes by iron modified clay were determined. The maximum removal percentages achieved were 97% and 98% for R5 and Y5, respectively, and a contact time of 72 h; the experimental data were best adjusted to Ho model. The isotherms of both dyes were best adjusted to the Langmuir model and the maximum adsorpt

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OLUFEMI, BABATOPE, and EMEKA NNANNA. "ADSORPTION OF NICKEL (II) IONS FROM SOLUTION USING SAWDUST AND MODIFIED SAWDUST." Journal of Engineering Studies and Research 28, no. 2 (2022): 62–72. http://dx.doi.org/10.29081/jesr.v28i2.007.

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By varying adsorbate concentration, temperature, contact time, pH, and adsorbent weight, the capacity of non-modified (NM) and modified (M) sawdust adsorbents to adsorb Ni2+ ions were studied in this work. The adsorption of Ni (II) ions rose as the adsorbent weight increased but reduced as the adsorbate concentration increased. Adsorption was greatest at pH 6, with the NM and M adsorbents removing 95.09 and 96.95% of Ni2+ ions, respectively. The highly dependent nature of the percent removal on operational variables was established by employing Analysis of Variance (ANOVA) as well as the Bonfe

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Guo, Ying Juan, Juan Qin Xue, Qiang Bi, Jing Xian Li, and Wei Bo Mao. "Research on the Behaviors of the Adsorption of Sulfate Ions onto Cross-Linked Chitosan in Wastewater." Advanced Materials Research 160-162 (November 2010): 1797–803. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1797.

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Formaldehyde cross-linked chitosan was used to adsorb sulfate ions from aqueous solution in this study. Batch experiments were conducted to investigate the conditions of the adsorption, the isotherms and kinetics of the adsorption. The optimized conditions of adsorption were as follows: the adsorbent dosage was 0.5g, the equilibrium time was 240min, the initial concentration of sulfate ions was 153.3mg/L, the temperature was 50°Cand the value of pH was 2.2. The maximum adsorption capacity came up to 14.7 mg/g with the adsorption efficiency got to 95.7%. The equilibrium data fitted Langmuir iso

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18

Olufemi, Babatope Abimbola, and Adedoyin T. Damola-Okesiji. "Optimal Adsorptive Bleaching of Palm Oil with Activated Beans Husks." NUST Journal of Engineering Sciences 13, no. 2 (2020): 63–73. http://dx.doi.org/10.24949/njes.v13i2.630.

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The effectiveness of activated bean husks for the adsorptive bleaching of palm oil was studied in this work. Optimal bleaching parameters like temperature, time and adsorbent-oil ratio were determined for the palm oil decolouration. Various weights of 1, 1.5 and 2 g of activated beans husks were contacted with crude palm oil at 50, 80, 110, 140 and 170 °C and contact times of 45, 60 and 90 minutes using 20 ml of oil sample in each case. The decolorizing effect increased linearly with temperature. Optimal adsorption conditions gave a bleaching efficiency of 98%. Langmuir, Freundlich, Temkin wit

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19

Mashile, Geaneth Pertunia, Kgokgobi Mogolodi Dimpe, and Philiswa Nosizo Nomngongo. "A Biodegradable Magnetic Nanocomposite as a Superabsorbent for the Simultaneous Removal of Selected Fluoroquinolones from Environmental Water Matrices: Isotherm, Kinetics, Thermodynamic Studies and Cost Analysis." Polymers 12, no. 5 (2020): 1102. http://dx.doi.org/10.3390/polym12051102.

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The application of a magnetic mesoporous carbon/β-cyclodextrin–chitosan (MMPC/Cyc-Chit) nanocomposite for the adsorptive removal of danofloxacin (DANO), enrofloxacin (ENRO) and levofloxacin (LEVO) from aqueous and environmental samples is reported in this study. The morphology and surface characteristics of the magnetic nanocomposite were investigated by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption–desorption and Fourier transform infrared spectroscopy (FTIR). The N2 adsorption–desorption results revealed that the prepared nanocomposite was mesoporous and the BET surface ar

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Venkatraman, B. R., S. Parthasarathy, A. Kasthuri, P. Pandian, and S. Arivoli. "Adsorption of Chromium Ions by Acid Activated Low Cost Carbon-Kinetic,Thermodynamic and Equilibrium Studies." E-Journal of Chemistry 6, s1 (2009): S1—S11. http://dx.doi.org/10.1155/2009/134010.

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A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing metal ions. The process parameters studied include agitation time, initial metal ions concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 30 mg/g at an initial pH of 7.0. The temperature variation s

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Beda, R. H. B., P. M. Niamien, E. B. Avo Bilé, and A. Trokourey. "Inhibition of Aluminium Corrosion in 1.0 M HCl by Caffeine: Experimental and DFT Studies." Advances in Chemistry 2017 (December 24, 2017): 1–10. http://dx.doi.org/10.1155/2017/6975248.

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Aluminium corrosion inhibition in 1.0 M hydrochloric acid solution by caffeine has been studied using mass loss technique and quantum chemical calculations based on DFT. The inhibition efficiency was found to increase with increasing concentration of caffeine but decreases with a rise in temperature. The molecule shows the highest inhibition efficiency of 74% at 10−2 M for T=303 K. The experimental data were used to fit isotherms including Langmuir, Temkin, Freundlich, and El-Awady. The best fits were obtained with the Langmuir model and the kinetic-thermodynamic adsorption model of El-Awady.

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Vijayakumaran, V., S. Arivoli, and S. Ramuthai. "Adsorption of Nickel Ion by Low Cost Carbon-Kinetic, Thermodynamic and Equilibrium Studies." E-Journal of Chemistry 6, s1 (2009): S347—S357. http://dx.doi.org/10.1155/2009/878037.

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A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing nickel ion. The process parameters studied include agitation time, initial metal ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 43 mg/g at an initial pH of 7.0. The temperature variation stu

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Zhang, Jun, Renjian Deng, Bozhi Ren, Mohammed Yaseen, and Andrew Hursthouse. "Enhancing the Removal of Sb (III) from Water: A Fe3O4@HCO Composite Adsorbent Caged in Sodium Alginate Microbeads." Processes 8, no. 1 (2020): 44. http://dx.doi.org/10.3390/pr8010044.

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To remove antimony (Sb) ions from water, a novel composite adsorbent was fabricated from ferriferous oxide and waste sludge from a chemical polishing process (Fe3O4@HCO) and encapsulated in sodium alginate (SAB). The SAB adsorbent performed well with 80%–96% removal of Sb (III) ions within a concentration range of 5–60 mg/L. The adsorption mechanism of Sb (III) was revealed to be the synergy of chemisorption (ion exchange) and physisorption (diffusion reaction). The adsorption isotherms and kinetics conformed to the Langmuir isotherm and the pesudo-second-order kinetic model. Both initial pH a

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Otto, K., and H. Sorek. "Adsorption Studies With Radiolabeled Zinc Dialkyldithiophosphate." Journal of Tribology 108, no. 3 (1986): 340–44. http://dx.doi.org/10.1115/1.3261189.

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Adsorption of zinc di-n-octyldithiophosphate synthesized with radioactive 65Zn has been studied on iron, steel, silica, and carbon. Adsorption on iron powder in an inert atmosphere is described by Elovich kinetics and Langmuir type isotherms. Adsorption equilibrium was not complete even after ten days. Results indicate activated chemisorption with an apparent activation energy of 15 kJ/mol (3.6 kcal/mol) on relatively uniform adsorption sites. Adsorbent composition, oxygen concentration, and solution contaminants, such as methanol, strongly influence adsorption capacity. Monolayer coverage, de

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Tigori, M. A., P.M Niamien, and A. Trokourey. "Thiamine Hydrochloride as Copper Corrosion Inhibitor in 1M HNO3." Journal of Progressive Research in Chemistry 4, no. 1 (2016): 166–78. https://doi.org/10.5281/zenodo.3969825.

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3-((4-Amino-2-methyl-5-pyrimidinyl) methyl)-5-(2-hydroxyethyl)-4-methylthiazolium chloride hydrochloride also known as Thiamine hydrochloride (Vitamin B1 hydrochloride) was used as copper corrosion inhibitor in 1.0M HNO3 solution. The study was performed using weight loss and Density Functional Theory (DFT) methods. Copper dissolution was found to be temperature and Thiamine concentration dependent. The thermodynamic functions related to the adsorption of the molecule on the copper surface and that of the metal dissolution were determined. The results show a spontaneous adsorption and an endot

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Nadler, Melvin P., Robin A. Nissan, and Richard A. Hollins. "FT-IR and FT-NMR Study of Organophosphorus Surface Reactions." Applied Spectroscopy 42, no. 4 (1988): 634–42. http://dx.doi.org/10.1366/0003702884429463.

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Fourier transform infrared (FT-IR) and Fourier transform nuclear magnetic resonance (FT-NMR) methods were used to examine the adsorption and reaction of diisopropyl fluorophosphate (DFP) on various solid adsorbents. Static and flow system experiments were monitored with the use of FT-IR to determine DFP adsorption rates and isotherms on silica, coated silicas, γ-alumina, coated aluminas, and activated charcoal. The adsorption of DFP(g) onto the solid adsorbents was generally very rapid, with a half-life of 20 s for 1 mg DFP onto 25 mg of 350 m2/g silica. The DFP adsorption isotherm on silica i

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Juleanti, Novie, Erni Salasia Fitri, and Patimah Mega Syah Bahar Nur Siregar. "Carbon-Based Adsorbents from Biochar and Microcrystalline Cellulose for Phenol Removal in Aqueous Solutions." Indonesian Journal of Material Research 2, no. 3 (2024): 86–92. http://dx.doi.org/10.26554/ijmr.20242345.

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This study investigates the adsorption characteristics of phenol on rice husk biochar (BC) and microcrystalline cellulose (MC), with a focus on their structural, kinetic, isotherm, and thermodynamic properties. XRD and FTIR analyses reveal that BC and MC possess similar carbon-based structures. Nitrogen adsorption-desorption isotherms highlight BC’s higher surface area and pore volume, which likely contribute to its superior adsorption performance. Adsorption kinetics are best described by the PSO model, indicating chemisorption as the rate-limiting step. Isotherm studies show that the Langmui

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Nikmah, Nadratun, Roto Roto, and Mudasir Mudasir. "Isotherm and Kinetic Adsorption of Malachite Green Using Low-Cost Adsorbent of Coal Fly Ash." Key Engineering Materials 949 (July 26, 2023): 163–73. http://dx.doi.org/10.4028/p-08iw7p.

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In this study, isotherm and kinetic adsorption of malachite green (MG) using coal fly ash (CFA) as the adsorbent was investigated. This study aimed to examine the character of CFA analyzed by Atomic Absorption Spectrophotometry (AAS), Fourier-Transformed Infra-Red (FTIR), and X-Ray Diffraction (XRD) analysis. In addition, the adsorption of MG on CFA was also studied, including the effect of solution pH, adsorbent mass, contact time, and concentration of malachite green on the adsorption process. From the experimental data, the kinetic parameters isotherms and energy of the adsorption were dete

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Rothschild, Avner, and Yigal Komem. "Numerical computation of chemisorption isotherms for device modeling of semiconductor gas sensors." Sensors and Actuators B: Chemical 93, no. 1-3 (2003): 362–69. http://dx.doi.org/10.1016/s0925-4005(03)00212-0.

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Kajjumba, George William, Serdar Aydın, and Sinan Güneysu. "Adsorption isotherms and kinetics of vanadium by shale and coal waste." Adsorption Science & Technology 36, no. 3-4 (2017): 936–52. http://dx.doi.org/10.1177/0263617417733586.

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The use of adsorption using nanomaterials has become a very competitive method for removal of hazardous materials from wastewater. With increasing consumption of fossil fuels and development of energy storage systems, the levels of vanadium pollution are expected to increase. Utilizing natural shale and coal waste as adsorbents, batch adsorption, isotherms, and kinetics of vanadium was studied. The adsorption characteristics of shale and coal waste were studied using Fourier Transform Infrared spectroscope and Scanning Electron Microscopy. The effect of pH, the amount of adsorbent, vanadium co

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Nor, Norhusna Mohamad, Nur Hidayahtul Nazrah Kamil, Amirul Izan Mansor, and Hawaiah Imam Maarof. "Adsorption Analysis of Fluoride Removal Using Graphene Oxide/Eggshell Adsorbent." Indonesian Journal of Chemistry 20, no. 3 (2020): 579. http://dx.doi.org/10.22146/ijc.43481.

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Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F–) removal. An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F– concentration, contact time, and temperature. The effects of these adsorption parameters towards F– removal by using GO/ES adsorbent were investigated. The adsorption parameters were then analyzed with adsorption isotherms (Langmuir and Freundlich), kinetics (pseudo-first-order and second-order) and thermodynamic studies. Under various parameters, GO/ES is proven as an effective adsorbent

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Sun, Xiaoyin, Xintian Lv, Caohui Han, Lu Bai, Tingting Wang, and Yongchang Sun. "Fabrication of Polyethyleneimine-Modified Nanocellulose/Magnetic Bentonite Composite as a Functional Biosorbent for Efficient Removal of Cu(Ⅱ)." Water 14, no. 17 (2022): 2656. http://dx.doi.org/10.3390/w14172656.

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A novel inorganic–organic biosorbent, polyethyleneimine (PEI)-modified nanocellulose cross-linked with magnetic bentonite, was prepared for the removal of Cu(Ⅱ) from water. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) showed that the amino and carboxyl groups were successfully grafted onto the nanocellulose structure. The adsorption performance of Cu(Ⅱ) with various factors, using the biosorbent, was investigated. The results show that the adsorption equilibrium could be reached within a short time (10 min), and the adsorption capacity of Cu(Ⅱ) reached up to 757.

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Oguzie, E. E. "Adsorption and corrosion inhibitive properties of Azadirachta indica in acid solutions." Pigment & Resin Technology 35, no. 6 (2006): 334–40. http://dx.doi.org/10.1108/03699420610711335.

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PurposeTo assess the protective effect and adsorption behaviour of Azadirachta indica extract in controlling mild steel corrosion in 1 M H2SO4 and 2 M HCl.Design/methodology/approachThe inhibitive effect of the plant extract was monitored using the gas‐volumetric technique. The inhibition mechanism was inferred by curve fitting of the experimental data to known adsorption isotherms and the trend of inhibition efficiency with temperature.FindingsAzadirachta indica extract effectively inhibited steel corrosion in the acid media studied by virtue of adsorption. The inhibitor adsorption characteri

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Altynbaeva, Liliya Sh, Anastassiya A. Mashentseva, Nurgulim A. Aimanova, et al. "Eco-Friendly Electroless Template Synthesis of Cu-Based Composite Track-Etched Membranes for Sorption Removal of Lead(II) Ions." Membranes 13, no. 5 (2023): 495. http://dx.doi.org/10.3390/membranes13050495.

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This paper reports the synthesis of composite track-etched membranes (TeMs) modified with electrolessly deposited copper microtubules using copper deposition baths based on environmentally friendly and non-toxic reducing agents (ascorbic acid (Asc), glyoxylic acid (Gly), and dimethylamine borane (DMAB)), and comparative testing of their lead(II) ion removal capacity via batch adsorption experiments. The structure and composition of the composites were investigated by X-ray diffraction technique and scanning electron and atomic force microscopies. The optimal conditions for copper electroless p

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Jian, Yan Qiang, Ming Yu Li, and Qing Xuan Zeng. "Thermodynamics of Cr(VI) Adsorption on Thiourea Chelating Ion Exchange Fiber." Advanced Materials Research 894 (February 2014): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.894.121.

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A chelating ion exchange fiber containing thioureido groups for the removal of Cr (VI) has been prepared from chloramethylated styrene grafted polypropylene fiber (2.96 mmol/g Cl) reacted with thiourea, batch adsorption experiments are adopted to investigate its adsorption equilibrium properties, Adsorption isotherms at various temperatures were obtained. Langmuir linear equation model can well describe the adsorption equilibrium data suggesting that the adsorption process involves both chemisorption and physisorption. The values of thermodynamic parameters, including ΔH, ΔGand ΔS, indicate th

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Overah, L. C. "Nonlinear Kinetic and Equilibrium Adsorption Isotherm Study of Cadmium (II) Sorption by Dacryodes edulis Biomass." Nigerian Journal of Basic and Applied Sciences 28, no. 2 (2021): 10–19. http://dx.doi.org/10.4314/njbas.v28i2.2.

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The kinetics and equilibrium adsorption isotherm of cadmium (II) adsorption onto Dacryodes edulis (native peer seed) biomass was studied using a nonlinear approach, which is unpopular but proven in some literature to be more reliable and easier. In optimizing the process, about 98% removal of the cadmium ion was achieved within five minutes at pH 7 by contacting just 30 mg of the Dacryodes edulis seed biomass with the adsorbate solution of a concentration of 100 mg/L. Non-linear investigation of the kinetics and adsorption isotherms of the process was done using the R console statistical and c

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Mosoarca, Giannin, Simona Popa, Cosmin Vancea, Mircea Dan, and Sorina Boran. "Modelling and Optimization of Methylene Blue Adsorption Process on Leonurus cardiaca L. Biomass Powder." Processes 11, no. 12 (2023): 3385. http://dx.doi.org/10.3390/pr11123385.

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The main objective of this study was to optimize the adsorption process of methylene blue on a natural, low-cost adsorbent, Leonurus cardiaca L. biomass powder, in order to maximize dye removal efficiency from aqueous solutions. For this purpose, the Taguchi method was used based on an L27 orthogonal array design considering six controllable factors at three levels. The percentage contribution of each factor was computed using analysis of variance (ANOVA). The optimal adsorption conditions were established. The experimental data from equilibrium and kinetic studies were modelled using specific

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Bond, G. C., and L. Hui. "The Form of Hydrogen Chemisorption Isotherms on a Pt/SiO2 Catalyst (EUROPT-1)." Journal of Catalysis 147, no. 1 (1994): 346–48. http://dx.doi.org/10.1006/jcat.1994.1146.

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Putri, Violla Bestari Ayu Sabrina, Dwi Siswanta, and Mudasir Mudasir. "Adsorption of Copper(II) on Dithizone-Immobilized Coal Fly Ash." Key Engineering Materials 840 (April 2020): 48–56. http://dx.doi.org/10.4028/www.scientific.net/kem.840.48.

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The adsorption of Cu (II) ions onto selective adsorbent of coal fly ash from Sugar Factory Madukismo, Yogyakarta, Indonesia modified with dithizone has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Cu (II) were optimized including an effect of pH, contact time and initial concentration of Cu (II) ions. The FT-IR and XRD analytical results show that the surface of coal fly ash can be modified by immobilization of selective organic ligand towards Cu (II) ions. The optimum conditions for adsorption of Cu (II) are achieved at pH 5, the o

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Boudrahem, N., F. Aissani-Benissad, F. Boudrahem, C. Vial, F. Audonnet, and L. Favier. "Preparation and characterization of activated carbon developed from cotton cloth residue activated with phosphoric acid: adsorption of clofibric acid." Water Science and Technology 82, no. 11 (2020): 2513–24. http://dx.doi.org/10.2166/wst.2020.524.

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Abstract Cotton cloth waste was used as a precursor to prepare activated carbon (ACCs) chemically activated with phosphoric acid. Adsorption behavior of prepared ACCs was correlated with physicochemical proprieties. The pore volume and BET surface of ACCs were determined by nitrogen adsorption isotherms and scanning electron microscopy was used to observe their surface morphologies. Fourier transform infrared (FTIR) spectroscopy analysis and pH point zero charge (pHPZC) were conducted to determine chemical properties. Under the optimal conditions: 50% impregnation ratio and thermal treatment u

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Yuan, Xiaoli, Wentang Xia, Juan An, Jianguo Yin, Xuejiao Zhou, and Wenqiang Yang. "Kinetic and Thermodynamic Studies on the Phosphate Adsorption Removal by Dolomite Mineral." Journal of Chemistry 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/853105.

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The efficiency of dolomite to remove phosphate from aqueous solutions was investigated. The experimental results showed that the removal of phosphate by dolomite was rapid (the removal rate over 95% in 60 min) when the initial phosphate concentration is at the range of 10–50 mg/L. Several kinetic models including intraparticle diffusion model, pseudo-first-order model, Elovich model, and pseudo-second-order model were employed to evaluate the kinetics data of phosphate adsorption onto dolomite and pseudo-second-order model was recommended to describe the adsorption kinetics characteristics. Fu

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El-Aassar, Mohamed R., Tamer M. Tamer, Mohamed Y. El-Sayed, et al. "Development of Azo Dye Immobilized Sulfonated Poly (Glycidyl Methacrylate) Polymer Composite as Novel Adsorbents for Water Treatment Applications: Methylene Blue Immobilization Isotherm, Kinetic, Thermodynamic, and Simulations Studies." Molecules 27, no. 23 (2022): 8418. http://dx.doi.org/10.3390/molecules27238418.

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Methylene blue (MB) immobilized onto a sulfonated poly(glycidyl methacrylate) (SPGMA) polymer composite has been developed as a novel adsorbent for water treatment applications. The MB adsorptions onto sulfonated poly(glycidyl methacrylate) polymer characters have been studied. The adsorption isotherms, namely Langmuir and Freundlich, have been investigated. Other isotherm models. As a compromise between the Freundlich and Langmuir isotherm models, such as the D–R isotherm and the Temkin isotherm, have been compared. The results indicated that the adsorption process followed the Freundlich iso

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Irfan, Muhammad, Fareeda Zaheer, Humaira Hussain, et al. "Kinetics and Adsorption Isotherms of Amine-Functionalized Magnesium Ferrite Produced Using Sol-Gel Method for Treatment of Heavy Metals in Wastewater." Materials 15, no. 11 (2022): 4009. http://dx.doi.org/10.3390/ma15114009.

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This study is focused on the kinetics and adsorption isotherms of amine-functionalized magnesium ferrite (MgFe2O4) for treating the heavy metals in wastewater. A sol-gel route was adopted to produce MgFe2O4 nanoparticles. The surfaces of the MgFe2O4 nanoparticles were functionalized using primary amine (ethanolamine). The surface morphology, phase formation, and functionality of the MgFe2O4 nano-adsorbents were studied using the SEM, UV-visible, FTIR, and TGA techniques. The characterized nanoparticles were tested on their ability to adsorb the Pb2+, Cu2+, and Zn2+ ions from the wastewater. Th

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Rimoli, Michelle Ferreira da Silva, Roberta Martins Nogueira, Pryscila Machado de Catro, et al. "New alternative for adsorption of 2,4-dichlorophenoxyacetic acid herbicide (2,4-D)." Bioscience Journal 39 (August 18, 2023): e39091. http://dx.doi.org/10.14393/bj-v39n0a2023-64440.

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The adsorptive capacity of charcoal from the husk of the brazil nut fruit, called “ouriço” (the hard ball with nuts inside) for the herbicide dichlorophenoxyacetic acid (2,4-D) was evaluated. Activated carbons were produced from the brazil nut in a tubular oven at 800 °C and activated with CO2 or water steam. The specific surface area was determined by the Brunauer, Emmett and Teller (BET) method, demonstrating the mean density of micropores. Analysis of N2 adsorption/desorption isotherms was undertaken and the morphology of activated carbons was visualized by Scanning Microscopy (SEM). The ac

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Stavrinou, A., M. A. Theodoropoulou, C. A. Aggelopoulos, and C. D. Tsakiroglou. "Removal of Phenanthrene from wastewater with low-cost adsorbents." IOP Conference Series: Earth and Environmental Science 1123, no. 1 (2022): 012081. http://dx.doi.org/10.1088/1755-1315/1123/1/012081.

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Abstract The potential to remove Phenanthrene (PHE) from water matrices through adsorption onto natural organic substances (NOSs) and natural inorganic compounds (NICs) was studied. Coffee waste (CW) and activated carbon (AC) produced from CW, and chemically pre-treated with NaOH or H3PO4 were chosen as NOS, and diatomaceous earth (DE) and DE pre-treated with NaOH or H3PO4 was chosen as NIC. Comparative analysis showed that the AC produced from CW pre-treated with NaOH and pyrolyzed at 800 °C (CWAC-NaOH-800) was the most efficient adsorbent, and used for parametric analysis with respect to the

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LB, Keil, M. Galazka, El‐Kadi HS, Erickson EN, and DeBari VA. "Binding of beta 2 glycoprotein I to activated polystyrene and its recognition by human IgG autoantibodies." Biotechnology and Applied Biochemistry 22, no. 3 (1995): 305–13. http://dx.doi.org/10.1111/j.1470-8744.1995.tb00353.x.

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Beta 2 glycoprotein I (apolipoprotein H, beta 2GPI) is involved in the formation of epitope(s) recognized by clinically relevant autoantibodies from patients with antiphospholipid syndrome. We studied the binding of beta 2GPI to chemically activated polystyrene in a microtitre plate format. Adsorption isotherms (at 37 degrees C) were generated for beta 2GPI on activated polystyrene and on unactivated polystyrene, with both human serum antibodies and rabbit polyclonal IgG antibodies as probes, and horseradish peroxidase (HRP)‐tagged anti‐IgG to detect binding. Additionally, beta 2GPI was biotin

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Wang, Guanghui, Jingqing Gao, Rongxue Yang, Jingshen Zhang, Han Guo, and Jianlei Gao. "Preparation of sustainable non-combustion filler substrate from waterworks sludge/aluminum slag/gypsum/silica/maifan stone for phosphorus immobilization in constructed wetlands." Water Science and Technology 80, no. 1 (2019): 153–63. http://dx.doi.org/10.2166/wst.2019.258.

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Abstract In this study, an artificial wetland filler matrix capable of effectively fixing phosphorus was prepared using a non-combustion process to save energy. To evaluate the adsorption performance of this filler, adsorption experiments were performed and the phosphorus adsorption mechanism characterization was studied. An alkaline environment was found to be conducive to the increase of adsorption capacity, but excessive alkalinity was not conducive to adsorption. Static adsorption experiments showed that the phosphorus removal rate could reach 95% in the simulated phosphorus-containing was

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Uvarova, A. S., I. A. Vitkalova, and E. S. Pikalov. "Ceramic Waste Application for Iron Removal by Sorption of Natural and Waste Water." Ecology and Industry of Russia 26, no. 3 (2022): 34–39. http://dx.doi.org/10.18412/1816-0395-2022-3-34-39.

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Study results on sorption properties of broken bricks with particle size of 1-2 mm with regards to Fe(III) ions in standardized test solutions were presented. It was identified that broken bricks have satisfactory sorption properties, the most effective content of broken bricks vs. solution volume, sorption equilibrium, separation efficiency and static adsorption capacity were were brought to light. Kinetic curves and sorption isotherms were obtained to establish physical sorption surface control by broken bricks particles with an insignificant proportion of chemisorption. Broken bricks may be

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Arias Arias, Fabian, Marco Guevara, Talia Tene, et al. "The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide." Nanomaterials 10, no. 4 (2020): 681. http://dx.doi.org/10.3390/nano10040681.

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Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to

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Sousa, Matheus Urtiga, Alisson Mendes Rodrigues, Maria Eduarda Barbosa Araujo, Romualdo Rodrigues Menezes, Gelmires Araújo Neves, and Hélio Lucena Lira. "Adsorption of Sodium Diclofenac in Functionalized Palygoskite Clays." Materials 15, no. 8 (2022): 2708. http://dx.doi.org/10.3390/ma15082708.

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The effects of acid and organo-functionalizations on the surface of Brazilian palygorskite clay was investigated, evaluating its potential in the adsorptive capacity of the drug sodium diclofenac present in wastewaters. The modifications on the clay structure were investigated by X-ray diffraction, X-ray fluorescence, thermogravimetric, differential thermal analysis, Fourier transform infrared spectroscopy, surface area by N2 adsorption (77.5 K) and Zeta potential. The experimental design was carried out to find the best conditions for the adsorption tests, in which concentration, mass and pH

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