Arsenic adsorption on Ti-pillared montmorillonite
Arsenic adsorption on Ti-pillared montmorillonite
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DOI：
10.1002/jctb.2360
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发表时间：
2010-05
影响因子：
3.4
通讯作者：
Ping Na;Xiumin Jia;Bin Yuan;Yuan Li;Jiyu Na;Yuchen Chen;Linshuang Wang
中科院分区：
文献类型：
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作者：
Ping Na;Xiumin Jia;Bin Yuan;Yuan Li;Jiyu Na;Yuchen Chen;Linshuang Wang
背景：饮用水砷污染在世界上大多数国家都已发现。砷酸盐（As（V））和亚砷酸盐（As（III））是无机砷的两种主要形态，后者毒性更大。从水中去除砷离子引起了越来越多的关注，因此需要进一步理解和开发用于去除砷离子的技术。研究结果：研究了钛柱撑蒙脱石（Ti-MMT）对水溶液中砷酸根和亚砷酸根的吸附行为，考察了吸附时间、pH、温度、共存离子和离子强度对吸附效果的影响。砷和亚砷酸盐的吸附温度和pH值的依赖性，表明不同的吸附机制。共存离子对吸附的影响也进行了研究，在所研究的离子中，只有磷酸盐对砷酸盐的吸附有显着的影响，而其他离子的影响可以忽略不计。结果表明，砷酸根和亚砷酸根的吸附均符合准二级反应动力学模型，吸附等温线符合Langmuir和Freundlich吸附等温线模型。利用X射线衍射（XRD）和X射线光电子能谱（XPS）研究了吸附前后表面元素的性质。结论：研究表明，钛柱撑蒙脱石是一种有效的去除水溶液中砷和亚砷酸盐的材料。实验参数，如接触时间，溶液pH值，温度，初始浓度，共存离子，和离子强度进行了优化。版权所有© 2010化学工业协会
BACKGROUND: Arsenic pollution in drinking water has been found in most countries. Arsenate (As(V)) and arsenite (As(III)) are two major forms of inorganic arsenic species, and the latter is the more toxic. The removal of arsenic ions from water has attracted increased attention, and therefore further understanding and development of techniques for removal of arsenic ions are required. RESULTS: Adsorption of arsenate and arsenite from aqueous solutions using Ti-pillared montmorillonite (Ti-MMT) was investigated as a function of contact time, pH, temperature, coexisting ions, and ionic strength. The adsorption of both arsenate and arsenite were temperature and pH dependent, indicating different adsorption mechanisms. The effect of coexisting ions on the adsorption was also studied and, among the ions investigated, only phosphate had a noticeable influence on the adsorption of arsenate, while the effect of other ions was negligible. A pseudo-second-order chemical reaction model was obtained for both arsenate and arsenite; adsorption isotherms of arsenate and arsenite fitted the Langmuir and Freundlich isotherm models well. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to study the nature of surface elements before and after adsorption. CONCLUSIONS: This work demonstrates that Ti-pillared montmorillonite is an efficient material for the removal of arsenate and arsenite from aqueous solutions. Experimental parameters such as contact time, solution pH, temperature, initial concentration, coexisting ions, and ionic strength have been optimized. Copyright © 2010 Society of Chemical Industry