Iodide Adsorption onto Three Organic-Inorganic Composite Adsorbents

被引：11
作者：
Zhang, Huifang [1 ,2 ]
Guo, Tan [1 ,2 ]
Li, Quan [1 ]
Liu, Haining [1 ]
Ye, Xiushen [1 ]
Wu, Zhijian [1 ]
机构：
[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
ADSORPTION SCIENCE & TECHNOLOGY | 2012年 / 30卷 / 05期
基金：
中国国家自然科学基金;
关键词：
REMOVAL;
D O I：
10.1260/0263-6174.30.5.449
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Composite adsorbents, Ca(ALG)(2)-Cu2O, Ca(ALG)(2)-AgCl and Ca(ALG)(2)-Ag, were prepared using Cu2O, AgCl and Ag as the adsorption-active components and calcium alginate as the matrix material. The adsorption of iodide from aqueous solutions onto these adsorbents was investigated as a function of initial solution pH, temperature and co-existing NaCl. The loading of the adsorption-active components in the composite adsorbents is much higher than that in the reported composite adsorbents. In neutral solutions, the equilibrium adsorption amount follows the order of Ca(ALG)(2)-AgCl >> Ca(ALG)(2)-Ag >> Ca(ALG)(2)-Cu2O. The adsorption by Ca(ALG)(2)-AgCl is insensitive to pH, while the adsorption by Ca(ALG)(2)-Cu2O and Ca(ALG)(2)-Ag is pH dependent. The effect of temperature on the adsorption is more pronounced for Ca(ALG)(2)-Cu2O than for Ca(ALG)(2)-AgCl and Ca(ALG)(2)-Ag. The co-existing NaCl does not affect the adsorption by Ca(ALG)(2)-AgCl very much; however, it suppresses the adsorption by Ca(ALG)(2)-Ag, and especially, Ca(ALG)(2)-Cu2O. Chemical adsorption is the main mechanism for all the three adsorbents. Ca(ALG)(2)-AgCl was found to be the best adsorbent owing to its highest adsorption capacity, suitable adsorption rate and insensitivity to solution pH, temperature and co-existing NaCl.
引用
收藏
页码：449 / 460
页数：12
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