聚(丙烯酰胺-丙烯酸钠)复合膨润土制备及其对Pb^2＋的吸附  

The preparation of poly(acrylamide-co-sodium acrylate) bentonite composite and its adsorption to Pb^(2+)

作　　者：陈学青[1] 曹吉林[1] 杜秀娟[1] 常贵环[1] 

机构地区：[1]河北工业大学化工学院,绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《功能材料》2013年第9期1309-1314,共6页Journal of Functional Materials

基　　金：天津市科技支撑资助项目(10ZCKFSH01900);长江学者和创新团队发展计划资助项目(IRT1059)

摘　　要：由溶液聚合法制备了聚(丙烯酰胺-丙烯酸钠)复合膨润土吸附剂,通过FT-IR、XRD、TG-DTG、比表面积和SEM对复合物结构进行了表征。结果表明,丙烯酰胺和丙烯酸钠与膨润土发生插层聚合反应,形成了致密和热稳定性较好的层状复合物。聚(丙烯酰胺-丙烯酸钠)复合膨润土具有—COO-基团与膨润土层间阳离子及Si—OH、Al—OH基团的络合作用要强于聚丙烯酰胺复合膨润土,易于络合溶液中的阳离子。聚丙烯酰胺-丙烯酸钠复合膨润土通过离子交换和络合吸附Pb2+,吸附过程符合Langmuir等温吸附模型和二级动力学吸附模型,平衡吸附量为112.74mg/g。The poly（acrylamide-co-sodium acrylate）bentonite composites were prepared by solution polymeriza tion. FT-IR, XRD, TG-DTG, specific surface area and SEM were employed to characterize their structure. The result was that the acrylamide and sodium acrylate intercalated in interlayer of bentonite and polymerized, and the lamellar, dense composites with better heat stability were obtained. The interaction between --COO groups of poly（acrylamide-co-sodium acrylate）betonite composite and the cation , Si--OH and Al--OH groups o（ bentonite was stronger than polyacrylamide betonite composite, which made the poly（acrylamide-co-sodium acrylate）betonite composite to complex cation from solution easily. While Pb^2＋ occurred to not only ion exchange with interlayer cation but also complexing with --COO- of poly（acrylamide-co-sodium aerylate）betonite composite. The adsorption of Pb^2＋ conformed Langmuir isothermal adsorption model and pseudo second order equation, the adsorption capacity were 112.74mg/g.

关 键 词：复合膨润土 丙烯酰胺 丙烯酸钠 吸附Pb2+ 

分 类 号：TB332[一般工业技术—材料科学与工程]