Application of Grass char for Cd(II) treatment in column leaching test
Application of Grass char for Cd(II) treatment in column leaching test
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草炭处理Cd(II)在柱浸试验中的应用
DOI：
10.1016/j.jhazmat.2010.09.087
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Li;Z.;Katsumi;T.;Inui;T.
研究了各种吸附剂和有毒物质的吸附行为和机理。然而，这些报告大多数是基于批测试。近年来，人们逐渐认识到间歇试验和柱试验在吸附行为上的差异。研究了芦苇炭制备的新型吸附剂对Cd（II）的吸附行为。进行了间歇吸附试验和柱浸试验。研究了围压、pH值、流速、浓度和离子强度等因素的影响。发现速度对Cd（II）的突破具有可忽略的影响。首次观察到吸附亲和力随围压从0增加到100.00kPa而从高值（Rd=130.00）下降到可忽略的值（Rd=1.20）。酸性Cd（II）溶液的突破较早的解决方案，具有较低的pH值和较高的离子强度。镉（II）负载的吸附剂回收冲洗螯合剂通过柱。回收的吸附剂似乎适用于以下吸附处理。最后，提出了工程应用的建议。
Various adsorbents as well as toxicants have been investigated regarding the adsorption behaviors and mechanisms. However, most of these reports were based on batch test. The discrepancy in adsorption behaviors between batch test and column test has been recognized recently. This study was to investigate the sorption behavior of Cd(II) in a novel adsorbent made from Reed char. Batch adsorption test and column leaching test were both conducted. Various influence factors including confining pressure, pH, velocity, concentration and ionic strength were studied. The velocity was found to have negligible effect on the breakthrough of Cd(II). The adsorption affinity was observed for the first time to decrease from a high value (Rd=130.00) to a negligible one (Rd=1.20) with increasing confining pressure from 0 to 100.00kPa. The breakthrough of acid Cd(II) solution was earlier for solutions with less pH and higher ionic strength. The Cd(II) laden adsorbent was reclaimed by flushing chelants through the column. The recycled adsorbent appeared to be applicable in the following adsorption treatment. Suggestions were provided regarding the potential engineering applications.