不同膨润土对含镉废水的吸附性能  

Adsorption characteristics of Cd^(2+)-containing wastewater onto different bentonites

作　　者：仇欢[1,2,3] 王风贺[1,2,3] 李卉[1,2,3] 陈亚君[1,2,3] 赵斌[1,2,3] QIU Huan WANG Fenghe LI Hut CHEN Yajun ZHAO Bin(School of Environment, Nanjing Normal University, Nanjing 210023, China Jiangsu Key Laboratory of Material Cycle and Pollution Control, Nanjing 210023, China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China)

机构地区：[1]南京师范大学环境学院,南京210023 [2]江苏省物质循环与污染控制重点实验室,南京210023 [3]江苏省地理信息资源开发与利用协同创新中心,南京210023

出　　处：《环境工程学报》2016年第11期6513-6518,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41473071);江苏省科技支撑计划项目(BE2012758);江苏省太湖水环境治理科研项目(TH2013208)

摘　　要：研究了不同投加量和吸附时间时,钠基膨润土、钙基膨润土和高胶质价钙基膨润土对含镉废水中Cd^(2+)的吸附特性。研究结果表明,在相同投加量时钙基膨润土对Cd^(2+)的吸附性能最佳,吸附可在30 min达到平衡。3种膨润土-Cd^(2+)吸附体系中,Freundlich模型对钠基膨润土-Cd^(2+)吸附体系的拟合较好。由膨润土对Cd^(2+)的吸附动力学可知,该吸附过程符合准二级动力学。The influence of bentonite dosage and adsorption time on the adsorption of Cd^（2＋）-containing wastewater on three kinds of bentonite clay（ sodium bentonite,calcium bentonite,and calcium bentonite with a high colloidal index） was extensively investigated. Calcium bentonite exhibited a higher removal efficiency for Cd^（2＋）,reaching its adsorption equilibrium at 30 min. In addition,the adsorption behavior of sodium bentonite for Cd^（2＋）adsorption could be described using the Freundlich isotherm model. Finally,analysis of the adsorption dynamics indicated that the experimental data of the three bentonite clays fit well to the pseudo-second-order model.

关 键 词：膨润土 吸附 含镉废水 

分 类 号：X13[环境科学与工程—环境科学]