摘要
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(NO_(3))_(2)为模板、N,N-亚甲基双丙烯酰胺(MBA)为交联剂、过硫酸钾(K_(2)S_(2)O_(8))与亚硫酸氢钠(NaHSO_(3))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Pb^(2+)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Cu^(2+)和Cd^(2+)存在时,选择性系数分别为6.97(Pb^(2+)/Cu^(2+))和7.36(Pb^(2+)/Cd^(2+))。
Nitrohumic acid is obtained through taking humic acid as raw materials,and HNO_(3) 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(NO_(3))_(2) as template,N,N-methylene bisacrylamide as crosslinking agent,and K_(2)S_(2)O_(8) and NaHSO_(3) 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 Pb^(2+)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 Cu^(2+)and Cd^(2+),the selectivity coefficients are 6.97(Pb^(2+)/Cu^(2+))and 7.36(Pb^(2+)/Cd^(2+)).
作者
王安
边思梦
樊凯丽
赵峥
尚宏周
孙晓然
WANG An;BIAN Si-meng;FAN Kai-li;ZHAO Zheng;SHANG Hong-zhou;SUN Xiao-ran(College of Chemical Engineering,North China University of Science and Technology,Tangshan 063210,China;College of Material Science and Engineering,North China University of Science and Technology,Tangshan 063210,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第4期161-166,共6页
Modern Chemical Industry
基金
河北省重点研发计划项目(20373805D,202006-20211)。
关键词
腐植酸
印迹
硝化
吸附
humic acid
imprinted
nitrification
adsorption
