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Title: Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization
Authors: Wei, Y.-T.
Zheng, Y.-M. 
Paul Chen, J. 
Keywords: Adsorption
Spectroscopic analysis
Issue Date: 1-Apr-2011
Citation: Wei, Y.-T., Zheng, Y.-M., Paul Chen, J. (2011-04-01). Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization. Journal of Colloid and Interface Science 356 (1) : 234-239. ScholarBank@NUS Repository.
Abstract: Arsenic contamination in water, especially in groundwater, has been recognized as an important issue of concern because of its high mobility and toxicity. In this study, N-methylglucamine was immobilized onto crosslinked chitosan beads via atom transfer radical polymerization for an efficient adsorption of arsenic. It was demonstrated that the immobilization significantly enhanced the adsorption capacity. The uptake onto the adsorbent was highly pH dependent, and a maximum adsorption capacity as high as 69.28. mg/g was obtained at the optimum pH of 5. Most of arsenate was rapidly adsorbed in the first 5. h, and the adsorption equilibrium was established in 16. h, which was well described by an intraparticle diffusion model. The adsorbent exhibited a great uptake of the humic acid, which led to a decrease in the adsorption of arsenate. The effects of competitive anions on the adsorption exhibited the following descending sequence: sulfate ≫ phosphate > fluoride (negligible effect). Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the arsenic adsorption resulted from the presence of tertiary amine and hydroxyl functional groups grafted on the crosslinked chitosan. © 2010 Elsevier Inc.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2010.12.020
Appears in Collections:Staff Publications

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