EDTA柱撑MgAl水滑石对水中Cd^(2+)的吸附  

Adsorption of MgAl-EDTA LDHs on Cd^(2+) from Water

作　　者：徐芳[1] 陈秋燕[1] 王军涛[1] 

机构地区：[1]湖北科技学院核技术与化学生物学院,湖北咸宁437100

出　　处：《广州化工》2017年第4期63-65,69,共4页GuangZhou Chemical Industry

基　　金：湖北省教育厅科学技术研究项目(B2016199);湖北科技学院校级科研项目(KY14045);湖北科技学院博士启动基金项目资助(BK1518)

摘　　要：采用共沉淀法合成了MgAl-CO_3水滑石,以其为前体,采用离子交换法制备MgAl-EDTA柱撑水滑石,对水滑石前体及柱撑水滑石进行了XRD和IR表征。以水滑石前体及柱撑水滑石为吸附剂,对模拟废水中的Cd^(2+)进行吸附实验,考察温度、pH、吸附剂加入量、吸附时间对吸附过程和吸附效率的影响。结果表明,柱撑水滑石对Cd^(2+)的吸附效果显著优于水滑石前体,柱撑水滑石吸附Cd^(2+)的最佳条件为:温度为40℃,pH为6.0,吸附时间为150 min,柱撑水滑石加入量为1.5 g/L。The MgAl- CO_3hydrotalcite（ MgAl- HT） was synthesized by coprecipitation method and EDTA pillared MgAl- HT（ MgAl- EDTA- HT） was successfully synthesized by the ion exchange method with MgAl- HT as precursor.Both MgAl- HT and MgAl- EDTA- HT were characterized by XRD and IR,and they were used as adsorbent for the adsorption of Cd-（2＋）from water. The adsorption efficiency and the effects of different temperature,pH value,initial concentration and different adsorption time on the adsorption process were investigated. As a result,the adsorbility of MgAl- EDTA- HT was higher than that of MgAl- HT. The optimum condition was as follows： temperature was 40 ℃,pH = 6. 0,adsorption time was 150 min and initial LDHs lead concentration was 1. 5 g/L.

关 键 词：柱撑水滑石 EDTA Cd2+ 吸附 

分 类 号：O647.3[理学—物理化学]