分离富集环境水溶液中铅离子的离子印迹—固相萃取技术  

Separation and Enrichment of Pb(Ⅱ) Ions by the Combination of Surface Ionic Imprint and Solid Phase Extraction

作　　者：张祖磊[1] 薛旭良[1] 李楠楠[1] 

机构地区：[1]嘉兴学院生物与化学工程学院,浙江嘉兴314001

出　　处：《嘉兴学院学报》2012年第3期92-97,共6页Journal of Jiaxing University

基　　金：浙江省科技厅分析测试项目(2011C37033);2012年嘉兴学院SRT项目

摘　　要：以Pb(Ⅱ)为模板离子,壳聚糖为功能单体,硅胶为载体,γ-(2、3环氧丙氧)丙基三甲氧基硅烷(KH-560)为偶联剂,利用表面分子印迹技术和溶胶-凝胶法在稀醋酸溶液中制备了Pb(Ⅱ)离子印迹聚合物.采用傅立叶变换红外光谱法(FT-IR)对Pb(Ⅱ)离子印迹和非印迹聚合物的表面形貌和结构进行表征;并用电感耦合等离子体原子发射光谱法(ICP-AES)考察了吸附酸度、吸附剂用量、静置时间等对聚合物吸附性能的影响;研究了印迹聚合物在混合溶液中对Pb(Ⅱ)的选择性,比较了印迹和非印迹聚合物的吸附容量;在最佳吸附酸度为4.5时,0.3g吸附剂吸附5h达到平衡,Pb(Ⅱ)离子印迹聚合物对Pb(Ⅱ)离子具有较高的选择性,其饱和吸附容量是非印迹聚合物的2倍.Ph（II） ion imprinted polymer particles were prepared by surface molecular imprinting technique and sol gel process in acetic acid solution, with Pb（II） ion as the template, chitosan （CTS） as the functional monomer, silica gel and nanoSiO2 as the carrier, and KH-560 as the crosslinking agent. Both the imprinted and non imprinted polymer particles were characterized by FT-IR. Effect of adsorption acidity, sorbent dosage and resting time on adsorption rate was investigated by inductively coupled plasma atomic emission spectrometry （ICP-AES）. Selectivity for Pb（II） ions of the prepared polymer was also discussed in mixed aqueous solution. Adsorption capacity of Pb （II） ion imprinted polymer was compared with that of non imprinted polymer. Finally, imprint and adsorption mechanism was also put forward. The optimum acidity for quantitative enrichment was around pH 4.5, and the adsorption equilibrium could be reached in five hours. Pb（II） ion imprinted polymer exhibited high selectivity for Pb（II） ions, and its adsorption capacity was two times higher than that of non imprinted polymer.

关 键 词：离子印迹 固相萃取 原子光谱法 PB(II) 

分 类 号：O658.2[理学—分析化学]