Equilibrium and kinetic study of arsenic sorption by water-insoluble nanocomposite resin of poly[N-(4-vinylbenzyl)-N-methyl-d-glucamine]-montmorillonite

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• 作者：Bruno F. Urbano^a ; Bernabé ; L. Rivas^a ; ^{brivas@udec.cl} ; Francisco Martinez^b ; Spiro D. Alexandratos^c
• 关键词：Arsenic ; Adsorption ; N-methyl-d-glucamine ; Kinetic ; Ion exchange ; Isotherms
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 June, 2012
• 卷：193-194
• 期：Complete
• 页码：21-30
• 文件大小：1061 K

摘要

This research presents the kinetic and equilibrium performance of arsenic sorption by a novel polymer-clay nanocomposite ion exchange resin. The monomer N-(4-vinylbenzyl)-N-methyl-d-glucamine was previously synthesised and subsequently polymerised via radical initiation in the presence of crosslinking reagent N,N-methylene-bis-acrylamide and organic-modified montmorillonite. The sorption of arsenic(V) was studied as a function of time, initial concentration and pH. Experiments as a function of pH revealed that arsenic sorption was favoured in the pH range from 3 to 6. The experimental data were fitted to kinetic and diffusion models, such as pseudo-first order, pseudo-second order, Elovich, and the intra-particle diffusion model. The pseudo-second order model presented the best correlation with the experimental data. The model indicated that high percentages of retention could be achieved in a short time (>90%, 1 h of contact) at pH 6 when the initial arsenic concentration was between 5 and 50 mg/L. Intra-particle diffusion and the Boyd relationship showed that arsenic sorption was controlled by the film diffusion mechanism. The Langmuir, Freundlich, and Dubinin-Radushkevitch isotherms were fitted to experimental data, and the Langmuir isotherm presented the best fit. Thermodynamic parameters (螖G掳, 螖H掳, 螖S掳) showed that the arsenic sorption process was a spontaneous process, endothermic, and produced an increase in entropy.