膨润土对重金属离子Pb^(2+),Zn^(2+),Cr(VI),Cd^(2+)的吸附性能  

Adsorption Characteristics of Bentonite to Pb^(2+),Zn^(2+),Cr(VI),Cd^(2+)

作　　者：施惠生[1] 刘艳红[2] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092 [2]同济大学环境材料研究所

出　　处：《建筑材料学报》2006年第5期507-510,共4页Journal of Building Materials

基　　金：国家自然科学基金资助项目(20277027)

摘　　要：试验研究了pH值、吸附时间和吸附剂用量对膨润土吸附重金属离子Pb2+,Zn2+,Cr(VI)和Cd2+的影响.结果表明,在本试验的pH值、吸附时间及吸附剂用量条件下,膨润土对Pb2+,Zn2+,Cd2+的吸附效果均优于其对Cr(VI)的吸附效果;pH值是影响上述吸附的重要因素,离子交换和表面络合是上述吸附的主要形式.The actors of influence in using bentonite to adsorb Pb^2＋ ,Zn^2＋ ,Cr（Ⅵ）,Cd^2＋ were discussed. The adsorption was tested under laboratory conditions as a functions of pH, adsorption time and quantity of bentonite. The results of this research show that the adsorption capacity of bentonite to Pb^2＋ ,Zn^2＋ ,Cd^2＋ is better than to Cr（Ⅵ） and the adsorption capacity strongly depends on pH. The research also indicates that the adsorption form may be mainly surface complex and ions exchange.

关 键 词：膨润土 重金属 PB^2+ ZN^2+ Cr(Ⅵ) CD^2+ 吸附作用 

分 类 号：TQ424.24[化学工程]