Studies on divalent ion uptake of transition metal cations by calcite through crystallization and cation exchange process
Studies on divalent ion uptake of transition metal cations by calcite through crystallization and cation exchange process
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方解石通过结晶和阳离子交换过程吸收过渡金属阳离子二价离子的研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. El
中科院分区：
文献类型：
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作者：
S. El
研究了方解石形态碳酸钙对Fe、Cu、Zn、Cd、Pb等过渡金属离子的吸附作用。结果表明，吸附反应顺序为：Pb ~（2+）> Cu ~（2+）Zn ~（2+）> Cd ~（2+）> Fe ~（2+），吸附量（meq/g）随金属离子浓度的增加和吸附时间的延长而增加。这些离子的吸收主要被认为是由于通过分解反应机制发生的结晶，如在Pb 2+、Cu 2+和Zn 2+的情况下，以及碳酸盐固体的晶格结构中存在的表面Ca 2+离子与金属阳离子的阳离子交换，如在Fe 2+和Cd 2+的情况下。方解石对这些阳离子的不同亲和力可用于废离子固定或去污。
The uptake of transition metal cations of Fe, Cu, Zn, Cd and Pb with calcium carbonate in the form of calcite was investigated. The uptake reaction was found to be in the following order: Pb2+ > Cu2+ Zn2+ > Cd2+ ≈ Fe2+; and the amount of uptake (meq/g) cations has been found to increase with the increase of the metal ion concentration and reaction time. The uptake of these ions was mainly considered to be due to the crystallization that happens through decomposition reaction mechanism as in case of Pb2+, Cu2+ and Zn2+ and cation exchange of surface Ca2+-ions present in lattice structure of carbonate solid with metal cations, as in the case of Fe2+ and Cd2+. The different affinities of calcite toward these cations can be used for waste ions fixations or decontamination.