以腐植酸为原料、浓硝酸为氧化剂合成硝化腐植酸(NA),再以硝化腐植酸为基质、N-异丙基丙烯酰胺(NIPAM)为功能单体、Pb(NO₃)₂为模板、N,N-亚甲基双丙烯酰胺(MBA)为交联剂、过硫酸钾(K₂S₂O₈)与亚硫酸氢钠(NaHSO₃)为复合引发剂,经过沉淀聚合法制备铅离子印迹聚合物IIPs。利用SEM、FT-IR、TG-DSC表征所得产物,探究产物的结构与性能,并通过紫外-可见分光光度法(UV-Vis)研究了IIPs的吸附性能。结果表明,IIPs对Pb²⁺的最大吸附量为21.71 mg/g,该吸附过程符合二级动力学模型和Langmuir热力学模型;IIPs最佳循环次数为7次;在竞争离子Cu²⁺和Cd²⁺存在时,选择性系数分别为6.97(Pb²⁺/Cu²⁺)和7.36(Pb²⁺/Cd²⁺)。

Nitrohumic acid is obtained through taking humic acid as raw materials,and HNO₃ as modifiers.Three kinds of lead ion imprinted polymers (IIPs) are prepared via precipitation polymerization method by using Nitrohumic acid as substrate,N-isopropylacrylamide as functional monomer,Pb(NO₃)₂ as template,N,N-methylene bisacrylamide as crosslinking agent,and K₂S₂O₈ and NaHSO₃ as composite initiators.SEM,FT-IR and TG-DSC are employed to characterize the obtained IIPs,and explore the structure and performance.The adsorption performance of IIPs is studied by ultraviolet-visible spectrophotometry (UV-Vis).The results show that the maximum adsorption capacity of IIPs for Pb²⁺ is 21.71 mg·g^-1,and the adsorption process conforms to the second-order kinetic model and Langmuir thermodynamic model.The optimal number of cycles of IIPs is 7.In the presence of competing ions Cu²⁺ and Cd²⁺,the selectivity coefficients are 6.97 (Pb²⁺/Cu²⁺) and 7.36 (Pb²⁺/Cd²⁺).

王安(1995-),男,硕士研究生,研究方向为功能高分子材料,wanganchina@126.com