聚(丙烯酸-co-丙烯酰胺)/膨润土/腐植酸钠三维网络凝胶吸附剂对Cd^(2+)吸附性能研究  

Adsorption performance of Cd(Ⅱ) from aqueous solution onto poly(acrylic acid-co-acrylamide)/montmorillonite/sodium humate with three-dimensional cross-linked networks

作　　者：郑易安[1] 王金磊[1,2] 王爱勤[1] 

机构地区：[1]中国科学院兰州化学物理研究所,兰州730000 [2]中国科学院研究生院,北京100049

出　　处：《环境工程学报》2009年第9期1719-1724,共6页Chinese Journal of Environmental Engineering

基　　金：江苏省科技厅太湖专项(BS2007118);甘肃省科技支撑资助项目(0804GKCA03A)

摘　　要：制备了一种聚(丙烯酸-co-丙烯酰胺)/膨润土/腐植酸钠三维网络凝胶吸附剂,重点考察了吸附剂对Cd2+吸附的pH依赖性、吸附动力学和吸附等温线。结果表明,Cd2+溶液pH值对吸附容量有较大影响。在pH=8、吸附时间30 min、Cd2+溶液初始浓度0.02 mol/L和吸附剂用量0.10 g的条件下,吸附剂对Cd2+的饱和吸附量可达294.7 mg/g。与膨润土相比,三维网络凝胶吸附剂具有更高的吸附容量和更快的吸附速率。In current work, a novel poly （acrylic acid-co-acrylamide）/montmorillonite/sodium humate with three-dimensional cross-linked networks was prepared and its efficacy for removing Cd （ Ⅱ ） from aqueous solution was evaluated. The effects of the initial pH value of Cd（ Ⅱ ） solution on the adsorption capacity, as well as adsorption kinetics and isotherms were investigated. The results indicate that the adsorption capacity of as-prepared adsorbent for Cd （ Ⅱ ） is pH-dependent. The saturated adsorption capacity of as-prepared adsorbent for Cd（ Ⅱ ） is found to be 294.7 mg/g under the following conditions： pH =8, contact time 30 min, initial Cd（ Ⅱ ） concentration 0. 02 mol/L and amount of adsorbent 0. 10 g. Compared to Ca-montmorillonite, gel adsorbent presents higher adsorotion caoacity and faster adsorotion rate.

关 键 词：凝胶 吸附剂 膨润土 镉 吸附 

分 类 号：TQ424.3[化学工程]