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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。
Using ethylene glycol dimethacrylate (EGDMA) as initiator, Pb2 + as template ion, maleic acid (MA) as functional monomer, styrene as backbone monomer and potassium persulfate (KPS) as initiator, The Pb2 + imprinted polymer (IIP) was prepared as crosslinking agent. The polymer was characterized by UV, FTIR and SEM. The selective adsorption of IIP on Pb2 + was analyzed by flame atomic absorption spectrometry. The results showed that during the polymerization, The adsorption capacity of IIP for Pb2 + reached 50.5 mg / g and the adsorption rate reached 90% at room temperature with the solution pH of 5.4 and the adsorption time of 60 min. Compared with the corresponding non-imprinted polymer (NIP) , The adsorption of Pb2 + by IIP increases and is selective. The relative selectivity coefficients of Pb2 + and Cd2 +, Mn2 + and Ni2 + with the same charge and similar ionic radius are 4.53, 15.7 and 6.16, respectively. When HNO3 (1 + 32) Solution as a desorbent, the desorption rate can reach 99%. The polymer can be used as adsorbent in the separation and enrichment of trace Pb2 + in environmental water samples.