羧基化吸附材料的制备及其对重金属离子的吸附  

Preparation of carboxylated adsorbents for adsorption of heavy metal ions

作　　者：陈尚龙[1,2] 王斌 刘恩岐[1,2] 陈安徽[1,2] 李超[1,2] 刘辉[1,2] 秦杰[1,2] CHEN Shang-long;WANG Bin;LIU En-qi;CHEN An-hui;LI Chao;LIU Hu;QIN Jie(College of Food and Biological Engineering,Xuzhou University of Technology,Xuzhou 221018,China;Jiangsu Key Construction Laboratory of Food Resources Development and Quality Safe,Xuzhou University of Technology,Xuzhou 221018,China)

机构地区：[1]徐州工程学院食品与生物工程学院,江苏徐州221018 [2]徐州工程学院,江苏省食品资源开发与质量安全重点建设实验室,江苏徐州221018

出　　处：《化学研究与应用》2024年第12期2785-2793,共9页Chemical Research and Application

基　　金：江苏省产学研合作项目(BY20221265)资助。

摘　　要：以玉米芯为原料,利用原子转移自由基聚合(atomic transfer radical polymerization,ATRP)技术在其表面引发丙烯酸甲酯发生聚合反应,再利用NaOH将嫁接在玉米芯表面的聚丙烯酸甲酯水解成聚丙烯酸钠,得到羧基化玉米芯吸附材料(C-C-A)。通过单因素试验和正交试验优化得到C-C-A最佳制备条件,同时采用FTIR、SEM-EDS和XPS对C-C-A进行表征,结果表明其表面凹凸不平,存在大量羧基。C-C-A对Pb^(2+)、Cd^(2+)、Cu^(2+)和Ni^(2+)的去除率均可达到98%以上,说明其可以有效去除重金属离子。C-C-A吸附重金属离子的过程既符合Pseudo-second-order动力学模型,又符合Langmuir等温线模型,属于单分子层化学吸附,且吸附较快。Using corncobs as raw material,ATRP(atomic transfer radical polymerization)technology was used to initiate the poly-merization of methyl acrylate.The poly(methyl acrylate)was hydrolyzed into poly(sodium acrylate)by NaOH solution to prepare carboxylated corncobs adsorbents(C-C-A).The optimum preparation conditions of C-C-A were obtained by the single factor and or-thogonal experiments.At the same time,FTIR,SEM-EDS and XPS were used to characterize C-C-A.The results showed that the surface of C-C-A is uneven and contains more carboxyl groups.The removal eficiencies of C-C-A for Pb^(2+),Cd^(2+),Cu^(2+)and Ni^(2+)can reach more than 98%,indicating that it can effectively remove heavy metal ions.The adsorptions of heavy metal ions by C-C-A con-form to both Pseudo-second-order model and Langmuir model.It is a monolayer chemisorption,which has faster adsorption.

关 键 词：原子转移自由基聚合 羧基 玉米芯 重金属离子 吸附 

分 类 号：O658[理学—分析化学]