| 膨润土对重金属离子的竞争性吸附研究 |
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| 引用本文： | 胡克伟,贾冬艳,颜丽,关连珠.膨润土对重金属离子的竞争性吸附研究[J].土壤通报,2011(2). |
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| 作者姓名： | 胡克伟 贾冬艳 颜丽 关连珠 |
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| 作者单位： | 辽宁农业职业技术学院;沈阳农业大学土地与环境学院; |
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| 摘 要： | 通过间歇震荡平衡法研究了膨润土对4种重金属离子Cd2+、Zn2+、Cu2+、Pb2+的竞争性吸附特性及其机制。研究结果表明:与单一离子体系比较,膨润土在竞争体系中对Cd2+、Zn2+、Cu2+、Pb2+4种重金属离子的吸附量均呈下降趋势。竞争体系下,其它重金属离子的存在显著抑制了膨润土对Cd2+的吸附,降幅为19.20%~37.50%,而对Pb2+的吸附能力几乎没有影响,降幅仅为0.41%~2.83%。膨润土对4种重金属离子的富集系数,其大小顺序依次为Pb2+>Cu2+>Zn2+>Cd2+。该选择性吸附顺序与重金属离子的一级水解常数密切相关。
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| 关 键 词： | 膨润土 重金属离子 竞争吸附 富集系数 |
Effect of Bentonite on Competitive Adsorption of Heavy Metals Ions |
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| HU Ke-wei ,JIA Dong-yan ,YAN Li ,GUAN Lian-zhu.Effect of Bentonite on Competitive Adsorption of Heavy Metals Ions[J].Chinese Journal of Soil Science,2011(2). |
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| Authors: | HU Ke-wei JIA Dong-yan YAN Li GUAN Lian-zhu |
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| Institution: | HU Ke-wei 1,2,JIA Dong-yan 1,YAN Li 2,GUAN Lian-zhu 2 (1.Liaoning Agricultural Vocation-Technical College,Yingkou 115009,China,2.College of Land and Environment,Shengyang Agricultural University,Shenyang 110866,China) |
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| Abstract: | The influence of bentonite on the competitive adsorption characteristic of Cd2+,Zn2+,Cu2+ and Pb2+ were studied under the conditions of pH=6,T=25℃ and low concentration of heavy metals.The results showed that adsorption of lead ions was decreased insignificantly in competitive adsorption condition,whereas a dramatic decrease was observed on the adsorption of cadmium ions by the presence of lead,copper and zinc ions.As compare to single system the enrichment coefficients of Cd2+ ions in competitive system reduced by 19.20%-37.50%,while Pb2+ ions reduced by 0.41%-2.83%.The enrichment coefficients of Cd2+,Zn2+,Cu2+ and Pb2+ ions by bentonite follow the descending order: Pb2+>Cu2+>Zn2+>Cd2+.There was a good correction between this order and first hydrolysis constants of heavy metal ions. |
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| Keywords: | Bentonite Heavy metals ions Competitive adsorption Enrichment coefficients |
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