镁铝层状双金属氢氧化物对Cu^2+和Cd^2+的吸收动力学研究  

Kinetics of uptake of Cu^2+and Cd^2+by Mg-Al layered double hydroxides

作　　者：王孝华[1] 汤琪 牟元华 李传强 涂胜 WANG Xiao-hua;TANG Qi;MU Yuan-hua;LI Chuan-qiang;TU Sheng(Teaching Quality Management and Evaluation Center,Chongqing Jiaotong University,Chongqing 400074,China;College of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学教学质量管理与评估中心,重庆400074 [2]重庆交通大学材料科学与工程学院,重庆400074

出　　处：《应用化工》2020年第7期1648-1653,共6页Applied Chemical Industry

基　　金：国家自然科学基金(21307168);重庆市自然科学基金(cstc2018jcyjA2661)。

摘　　要：研究了柠檬酸盐(C6H5O7^3-)、苹果酸盐(C4H4O5^2-)和酒石酸盐(C4H4O6^2-)插层的镁铝层状双金属氢氧化物(MgAl-LDHs)对Cu^2+、Cd^2+的吸收动力学。当将MgAl-LDHs加入到恒定pH=5.0的Cu^2+和Cd^2+溶液中时,Cu^2+和Cd^2+的浓度随着温度的升高而降低。结果表明,对重金属离子的吸收主要归因于重金属离子与有机酸阴离子之间发生了螯合作用,并发现吸收速率方程取决于形成的螯合物的类型。The kinetics of the uptake of Cu^2+and Cd^2+by Mg-Al layered double hydroxides(MgAl-LDHs)intercalated with citrate 3-(C6H5O7^3-),malate 2-(C4H4O5^2-),and tartrate 2-(C4H4O6^2-)in the interlayer were examined.When the MgAl-LDHs were added to Cu^2+and Cd^2+solutions of a constant pH of 5.0,the concentrations of Cu^2+and Cd^2+decreased with increasing temperature.The uptake was shown to occur as chelation between the heavy metal ions and the organic acid anions.The uptake rate equation was found to be dependent on the type of chelate formed.

关 键 词：镁铝层状双金属氢氧化物 有机酸阴离子 吸收动力学 重金属离子 

分 类 号：TQ139[化学工程—无机化工] X131[环境科学与工程—环境科学]