以共沉淀法合成的Mg2 ZnAl-CO3水滑石为前体,采用离子交换插层组装方法制备了Mg2 ZnAl-EDTA柱撑水滑石,并用XRD和IR进行表征。以水滑石前体和柱撑水滑石为吸附剂,用于废水中Pb2+的吸附。柱撑水滑石的吸附容量明显大于水滑石前体,柱撑水滑石的最佳吸附条件为：温度45℃,pH 5．5,吸附时间150 min,Pb2+初始浓度100 mg·L-1。在最佳吸附条件下,柱撑水滑石对废水中Pb2+的饱和吸附量为183．51 mg/g。%The Mg2 ZnAl-CO3 LDHs was synthesized by coprecipitation method and EDTA pillared Mg2 ZnAl-LDHs was successfully synthesized by the ion exchange method with Mg2 ZnAl-CO3 LDHs as precursor. The prepared samples were characterized by XRD and IR. The Mg2 ZnAl-CO3 LDHs and Mg2 ZnAl-EDTA LDHs were used as adsorbent for the adsorption of Pb2+from water,and the adsorbility of Mg2 ZnAl-EDTA LDHs was substantially higher than that of Mg2 ZnAl-CO3 LDHs. The results indicated that the opti-mum condition was as follows:temperature 45 ℃,pH value 5. 5,adsorption time 150 min and initial lead concentration 100 mg·L-1 . Under this condition,the adsorption capacity of Mg2 ZnAl-EDTA LDHs reached 183. 51 mg/g.
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