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题名: Selective removal of mercury ions using a chitosan-poly(vinyl alcohol) hydrogel adsorbent with three-dimensional network structure
作者: Wang, Xiaohuan; Deng, Wenye; Xie, Yuyu; Wang, Chuanyi
通讯作者: Wang, XH
关键词: Three-dimensional network ; Hg(II) ; Adsorption selectivity ; Mechanism ; Chitosan
刊名: Chemical Engineering Journal
发表日期: 2013
DOI: 10.1016/j.cej.2013.04.104
卷: 228, 期:7, 页:232-242
收录类别: SCI
摘要:  The chitosan-poly(vinyl alcohol) (CTS-PVA) hydrogel with three-dimensional network structure was developed via a glutaraldehyde cross-linking method in combination with an alternate freeze-thawed process. The formation of the three-dimensional network structure was confirmed by SEM and parallel FT-IR measurements. According to the analysis of parallel FT-IR measurements and MM+ molecular mechanics theoretical simulation, the three-dimensional network architecture is built mainly by inter- and intra-molecular hydrogen bonds as well as CN bonds formed by the reaction of NH2 groups of CTS and CHO groups of glutaraldehyde. Parallel adsorption experiments and comparative studies showed that the hydrogel adsorbent has superior adsorption capacity and selectivity for Hg(II) ions. Its adsorption capacity for Hg(II) ions reaches 585.90mg/g. Its selectivity coefficient of the hydrogel for Hg(II) ions is 487.7, 36642.5, 284298.5 times higher than that for Cu(II) ions, Pb(II) ions, and Cd(II) ions, respectively. Its selective adsorption mechanism for Hg(II) ions was proposed based on FT-IR and XPS spectral analysis before and after Hg(II) adsorption. All nitrogen-containing functional groups are involved in Hg(II) adsorption, especially, NHCOCH3 and CN groups are the main selective functional groups responsible for Hg(II) adsorption. The existing form of the adsorbed Hg(II) may be in mercury acetate.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3879
Appears in Collections:环境科学与技术研究室_期刊论文

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作者单位: Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, LEST, Urumqi 830011, Xinjiang, Peoples R China;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Anal & Testing Ctr, Urumqi 830011, Xinjiang, Peoples R China

Recommended Citation:
Wang, Xiaohuan,Deng, Wenye,Xie, Yuyu,et al. Selective removal of mercury ions using a chitosan-poly(vinyl alcohol) hydrogel adsorbent with three-dimensional network structure[J]. Chemical Engineering Journal,2013,228(7):232-242.
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