Chromium removal from water using LTA zeolites:: Effect of pH
Chromium removal from water using LTA zeolites:: Effect of pH
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DOI：
10.1016/j.jcis.2007.04.066
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发表时间：
2007-09-15
影响因子：
9.9
通讯作者：
Caputo, Domenico
中科院分区：
文献类型：
--
作者：
Basaldella, Elena I.;Vazquez, Patricia G.;Caputo, Domenico
研究了pH变化对合成NaA沸石离子交换去除水中Cr ~（3+）能力的影响。汇率因接近中性而有所改善。尽管同时发生的吸附，沉淀或阳离子交换现象，在不同的接触时间采取的样品的光谱分析表明，在固相中存在一个独特的铬环境。在离子交换过程中观察到的pH值的增加有利于溶液中存在的铬物质的聚合-沉淀，这反过来又提高了沸石NaA的金属去除能力，高于纯阳离子交换反应的预期值。(c)2007年爱思唯尔公司All rights reserved.
The effect of pH changes on the ability of the synthetic zeolite NaA to remove Cr3+ from water by ion exchange was investigated. The exchange rate was improved by working near neutrality. Despite of the occurrence of simultaneous adsorption, precipitation or cation exchange phenomena, spectroscopic analyses of samples taken at different contact times suggested the presence of an unique chromium environment in the solid phase. The increase in pH observed during the ion exchange favored polymerization-precipitation of chromium species present in solution, which, in turn, improved the metal removal capacity of zeolite NaA above the values expected for a pure cationic exchange reaction. (c) 2007 Elsevier Inc. All rights reserved.