聚丙烯酸盐-丙烯酰胺水凝胶的制备及对重金属离子吸附性能的研究  

Preparation of Poly( Acrylate-Acrylamide) Hydrogel and Its Adsorption Performance to Heavy Metal Ions

作　　者：刘宛宜[1] 杨璐泽 于萌[1] 刘淼[1] 

机构地区：[1]吉林大学环境与资源学院,地下水资源与环境教育部重点实验室,长春130012

出　　处：《分析化学》2016年第5期707-715,共9页Chinese Journal of Analytical Chemistry

基　　金：科技部科技重大专项-004基金项目(No.2012ZX07202009)资助~~

摘　　要：以丙烯酸(AA)、丙烯酰胺(AM)为单体,K_2S_2O_8为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,采用水溶液聚合法合成P(AA-AM)水凝胶,通过正交实验优化了P(AA-AM)水凝胶的制备工艺。对制备的P(AA-AM)水凝胶进行了SEM和XPS分析,探讨了P(AA-AM)水凝胶对Cu^(2+)、Pb^(2+)、Zn^(2+)和Cd^(2+)的吸附等温线和吸附动力学行为,研究了P(AA-AM)水凝胶的粒径、吸附温度、p H值和重金属离子的初始浓度对P(AA-AM)水凝胶吸附性能的影响。实验结果表明,所制备的P(AA-AM)水凝胶是一种具有三维网络结构的高分子材料,其表面的氨基和羧基残基能够与重金属离子发生螯合反应。减小P(AA-AM)水凝胶粒径、增大溶液pH值、升高吸附环境温度均有利于吸附反应的进行。粒径为0.097~0.15 mm的P(AA-AM)水凝胶粉末,在35℃、p H=5的条件下进行吸附等温线实验,得到水凝胶对重金属Cu^(2+),Pb^(2+),Zn^(2+)和Cd^(2+)的理论最大吸附量分别为186,588,208和403 mg/g。P(AA-AM)水凝胶对重金属离子的吸附符合准二级动力学模型(R^2>0.98),吸附等温线符合Langmuir吸附等温线(R^2>0.95)。干扰离子实验和理论模拟均证明P(AAAM)水凝胶对Pb^(2+)具有良好的吸附性。By using potassium sulfate and N, N＇-methylenebisacrylamide as initiator and acrosslinker, the poly（acrylate-acrylamide） （P （AA-AM）） hydrogel was optimized through orthogonal test and prepared by aqueous polymerization of sodium acrylate and acrylamide. The results of SEM and XPS experiments indicated that the P（AA-AM） hydrogel had three-dimensional network structure with carboxyl and acylamino residues. The carboxyl and acylamino residues could efficiently interact with heavy metal ions to form chelates. The adsorption isotherm and kinetic behavior of Cu2＋, Pb2＋, Zn2＋ and Cd2＋ on P （AA-AM） hydrogel were discussed. And the effects of particle size, the temperature, the pH value and the initial concentration of metal ions in solution on the adsorption capacity were investigated. The results showed that the particle size of the P（AA-AM） hydrogel, the pH value and the adsorption temperature of the solution could influence the adsorption reaction. The maximum absorption amounts of 0. 097-0. 15 mm P（AA-AM） hydrogel to Cu2＋, Pb2＋, Zn2＋ and Cd2＋ were 186, 588, 208 and 403 mg/g, respectively under the optimal conditions such as 35℃ and pH 5. The adsorption kinetic followed the pseudo-second-order kinetic mode （R2〉0.98） and the adsorption isotherm fit the Langmuir equation （R2〉0.95）. The interfering ions experiment showed that the P （AA-AM） hydrogel had good selective adsorption to Pb2＋.

关 键 词：丙烯酸盐 丙烯酰胺 水凝胶 重金属离子 吸附 

分 类 号：O647.3[理学—物理化学]