铅(Ⅱ)印迹聚合物制备及其对铅(Ⅱ)的选择性吸附研究  

Preparation of Pb^(2+) imprinted polymers and analysis of selective adsorption of Pb^(2+) on polymers by FAAS

作　　者：买迪娜木·阿不都瓦依提[1] 吾热古丽·依明 肖开提·阿布力孜[1] 

机构地区：[1]新疆大学石油天然气精细化工教育部和自治区重点实验室,化学化工学院,乌鲁木齐830046 [2]乌鲁木齐石化公司化肥厂,乌鲁木齐830019

出　　处：《分析试验室》2014年第9期1077-1081,共5页Chinese Journal of Analysis Laboratory

摘　　要：以Pb2+为模板离子,顺丁烯二酸(MA)为功能单体,苯乙烯(St)为骨架单体,过硫酸钾(KPS)为引发剂,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂制备了Pb2+印迹聚合物(IIP);用UV,FTIR,SEM对聚合物进行了表征,用火焰原子吸收光谱分析了IIP对Pb2+的选择性吸附;结果表明,聚合过程中发生了印迹作用,在室温下,溶液pH为5.4,吸附时间为60 min时,IIP对Pb2+的饱和吸附量可达到50.5 mg/g,吸附率达到90%;与相应非印迹聚合物(NIP)相比,IIP对Pb2+的吸附量增大并具有选择性,Pb2+与电荷相同及离子半径相近的Cd2+,Mn2+,Ni2+共存时,相对选择性系数分别为4.53,15.7,6.16;以HNO3(1+32)溶液作为解吸剂进行洗脱,解吸率可达99%;聚合物可作为吸附剂应用于环境水样中痕量Pb2+的分离富集。A lead ion imprinted maleic acid-co-styrene （IIP） polymer was synthesized, characterized and utilized in the selective separation and determination of trace Pb^2＋ in environmental water. The polymer was prepared by using maleic acid （MA） as a functional monomer, styrene （St） as a framework monomer, potassium persulfate（KSP） as an initiator, ethylene glycol dimethacrylate （EGDMA） as a crosslinker and lead ions as template ions. The IIP was characterized by using UV, FTIR, SEM and the selective adsorption of Pb^2 ＋ on IIP polymer was analyzed by FAAS. The polymer as an adsorbent was applied to separation and enrichment of trace Pb^2＋ ion in water samples. The experimental results show that the maximum adsorption capacity and rate reached 50.5 mg/g and 90% , respectively under the following conditions- pH of the solution was 5.4, the equilibrium contact time was within 60 min, the adsorption temperature was room temperature; compared to the corresponding non-imprinted polymer, adsorption amount and selectivity of Pb^2＋ ions on the IIP polymer increased ; when Pb^2＋ ions coexist with Cd^2＋ 、Mn^2＋ ,Ni^2＋ ,which have same charge and close ionic radius with Pb^2 ＋ ions, the relative selectivity coefficients were 4.53, 15.7 and 6.16, respectively. The desorption rate was up to 99% by using 3% nitric acid solution as a desorbent. The liP polymer has been applied to the separation and enrichment of trace Pb^2＋ in environmental water as an a＇tsorbent, and the results are satisfactory.

关 键 词：铅离子印迹聚合物 顺丁烯二酸 FAAS 吸附 

分 类 号：O652.6[理学—分析化学] O657.3[理学—化学]