CuZnMgAl水滑石衍生金属氧化物对废水中Pb(Ⅱ)的吸附

摘要

CuZnMgAl-hydrotalcites (CuZnMgAl-HT) with different metal molar ratios were synthesized by coprecipitation method. The crystal structure and thermal stability of as-synthesized CuZnMgAl-HT were analyzed by means of X-ray diffraction and thermal analysis. Moreover, as-synthesized CuZnMgAl-HT was calcinated, and the adsorption performance of the calcinated product, compound metal oxides, for Pb( D ) in waste water was examined. The optimum condition for adsorption is suggested as temperature 30℃, pH value 6.0, initial lead ion concentration 80 mg/L, CuZnMgAl-HT precursor metal molar ratio of Cu、Zn、Mg、Al was 1: 1: 4:2, and adsorption time 40 min. Corresponding adsorption rate reaches as much as 95. 23%%采用共沉淀法合成了不同物质的量之比的CuZnMgAl水滑石(CuZnMgAl-HT),采用X射线衍射仪和热分析仪分析了其晶体结构和热稳定性；将CuZnMgAl-HT的焙烧产物作为吸附剂,测定了其对废水中Pb(Ⅱ)的吸附性能.结果表明,最佳吸附条件为温度30℃,pH 6.0,初始浓度80 mg/L,水滑石前体Cu、Zn、Mg、Al的金属物质的量之比为1∶1∶4∶2,吸附时间40 min时,相应的吸附率可达95.23％.