铅离子印迹聚合物微球的制备及其吸附性能研究

以Pb2+为模板,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,十二烷基苯磺酸钠(SDBS)为分散剂,采用乳液悬浮聚合法制备了铅离子印迹聚合物微球。通过静态平衡吸附实验和Scatchard分析法研究了聚合物微球的吸附性能和选择性。结果表明,铅离子印迹聚合微球能有效去除溶液中的铅离子,最大吸附容量为15.29 mg/g。在竞争离子Cd2+存在的溶液中,铅离子印迹聚合物微球呈现出对铅离子的高选择性。Pb2+/Cd2+的识别因子为19.01,结合位点的离解常数Kd=35.61 mg/L,最大表观结合量Qmax=25.19 mg/g。

Preparation and characterization of lead ion imprinted polymer microspheres

The lead ion imprinted polymer mierospheres were prepared by emulsion suspension polymeri-zation with Pb^2＋ as the template,the methaerylie aeid（ MAA）,EDMA and SDBS were used as funetional monomer,cross-linker and dispersant respeetively. The reeognition ability and binding eharaeteristies of lead ion imprinted mierospheres were investigated by statie adsorption equilibrium method and Seatehard analysis. The results showed that the lead ion imprinted mierospheres were effieient for lead ions removal from aqueous solution with a maximum adsorption eapaeity of 15. 29 mg/g. In the presenee of eompetitive ions Cd^2＋,the lead ion imprinted mierospheres showed a high seleetivity for lead ions. The reeognition faetor of Pb^2＋/Cd^2＋ is 19. 01,dissoeiation eonstant Kd =35. 61 mg/L,the largest apparent eombined amount Qmax =25. 19 mg/g.