二氧化锰对铜、铅离子的吸附研究  

Single and Binary Component Adsorption of Copper Cation and Lead Cation From Aqueous Solutions Using Fresh δ-MnO_2

作　　者：邹卫华[1] 刘晨湘[2] 江利[2] 韩润平[2] 

机构地区：[1]郑州大学化工学院,河南郑州450002 [2]郑州大学化学系,河南郑州450052

出　　处：《郑州大学学报（工学版）》2005年第3期15-19,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省科技攻关资助项目(0424290065);河南省教育厅科技攻关资助项目(200510459016)

摘　　要：研究了δ型二氧化锰对Cu2+和Pb2+的吸附及竞争吸附性能,考察了溶液的pH值、温度、盐浓度、吸附时间等因素对吸附的影响.结果表明,吸附量随着溶液pH值的增大、温度的升高以及盐浓度的降低而增加.二氧化锰对单一体系中Cu2+和Pb2+的吸附符合Langmiur吸附等温式,吸附过程的ΔGo均为负值,ΔHo大于零,表明该过程是自发的吸热过程.二氧化锰对Cu2+和Pb2+的吸附过程可用准二级反应动力学模型较好地描述.共存离子的存在影响金属离子的吸附效率,Pb2+对Cu2+的吸附影响很大.二氧化锰对Cu2+和Pb2+的吸附强弱顺序为Pb2+>Cu2+.The adsorption ability of δ-MnO2 is investigated for the removal of copper and lead cation from single （non-competitive） and binary （competitive） aqueous systems. Adsorption of the investigated heavy metal ions by δ-MnO2 strongly depended on pH, contact time, salt concentration and initial concentration of metal ions. The experimental data for single system at different temperatures fit the Langmuir isotherm model excellently. The values of △G°and △H°show the spontaneous and endothermic process of copper and lead cations adsorbed by δ-MnO2. The dynamic data fit the pseudo-second-order kinetic model well. Experiments on competitive adsorption illustrate that the removal of metal ions decrease when other metal ions are added. The presence of lead cation has a significant effect on copper cation adsorption. The removal of copper and lead cation by δ-MnO2 followes the descending order： pb^2＋〉Cu^2＋.

关 键 词：二氧化锰 铜离子 铅离子 吸附 

分 类 号：X703[环境科学与工程—环境工程]