Leptothrix discophora对重金属离子的吸附效能研究

Adsorption efficiency research on the heavy metal ion with Leptothrix discophora

铁锰氧化细菌(Leptothrix discophora)可氧化铁锰离子使其成为高价态的氧化物和氢氧化物,生成的生物锰铁氧化物有较高的金属离子亲和力.本文主要研究了生物铁锰氧化物对Cu^(2+)、Zn^(2+)、Cd^(2+)、Ni^(2+)的吸附规律.结果表明,生物铁锰氧化物对Cu^(2+)的吸附效果明显好于Zn^(2+)、Cd^(2+),吸附率最高达90%以上.对等温吸附过程进行Freundlich方程拟合,相关系数可达0.9以上.

QIN Song-yan, HUANG Xin, DENG Fu-yong （School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China） Abstract： Leptothrix discophora can oxide the lower valence of Fe （ Ⅱ ） and Mn （ Ⅱ） to Fe （ Ⅲ）, Mn （ Ⅳ） oxides and hydroxides. Biological iron and manganese oxides formed by Leptothrix discophora have high affinity to metal ions. In this paper, the adsorption of Cu^2＋, Zn^2＋, Cd^2＋ and Ni^2＋ on biological iron manganese oxides was studied. According to the experimental result, biological iron and manganese oxides on the adsorption of Cu^2＋ is better than that of Zn^2＋, Cd^2＋, the adsorption rate reached to 90%. The adsorption data is fitted to Freundlich equation with good coefficient of correlation, which can reach more than 0.9.