螯合作用
化学
吸附
水溶液中的金属离子
水滑石
层状双氢氧化物
水溶液
无机化学
金属
插层(化学)
降水
离子交换
定性无机分析
吸收(声学)
离子
核化学
有机化学
材料科学
催化作用
复合材料
气象学
物理
作者
I. Pavlović,M.R. Pérez,C. Barriga,M.A. Ulibarri
标识
DOI:10.1016/j.clay.2008.07.020
摘要
The hydrotalcite-like compound [Zn2Al(OH)6]NO3·nH2O (ZnAl-NO3) was intercalated with the chelating agents diethylenetriaminepentaacetic acid (dtpa) and meso-2,3-dimercaptosuccinic acid (dmsa) by anion-exchange to uptake Cu2+, Cd2+ and Pb2+ from aqueous solutions. The amounts of heavy metals adsorbed at variable contact times and metal concentration were determined by atomic absorption spectrometry. The amounts removed of the three metal cations by both adsorbents were high. The shape of the adsorption isotherms obtained indicated specific interactions and a high host–guest affinity. However, the metal ions were removed from solution not only by chelation, but also by precipitation or even by isomorphic substitution of Zn2+ by another metal ions in the brucite-like layer.
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