中文摘要：

采用氨基-过硫酸盐氧化还原引发体系,先实现了甲基丙烯酸羟乙酯（HEMA）在微米级硅胶微粒表面的引发接枝聚合,制得高接枝度的接枝微粒PHEMA/SiO2.然后使接枝大分子PHEMA的侧羟基与5-氯-8-羟基喹啉（CHQ）发生亲核取代反应,将8-羟基喹啉（HQ）基团键合在接枝大分子侧链,使接枝大分子PHEMA实现8-羟基喹啉功能化转变,制得表面含有高密度HQ基团的功能接枝微粒HQ-PHEMA/SiO2,考察研究了功能微粒HQ-PHEMA/SiO2对Cd2＋离子的强螯合吸附作用.在此基础上,采用本课题组建立的新的分子表面印迹技术,以Cd2＋离子为模板离子,二氯乙醚为交联剂,对接枝在硅胶表面的功能大分子链HQ-PHEMA进行了离子印迹,制备了Cd2＋离子表面印迹材料IIP-HQP/SiO2,深入考察研究了其离子识别与结合特性.实验结果表明,该离子表面印迹材料对Cd2＋离子具有特异的识别选择性与优良的结合亲和性,相对于Cu2＋和Pb2＋两种对比离子,印迹材料IIP-HQP/SiO2对Cd2＋离子的识别选择性系数分别高达25.52和22.91,显示出超高的离子识别能力.

英文摘要：

Hydroxyethyl methacrylate（HEMA） was graft-polymerized on micron-sized silica gel particles via surfaceinitiated graft-polymerization with amino/persulfate redox initiating system,obtaining the grafted particles PHEMA/SiO2 with a high grafting degree.Subsequently,the nucleophilic substitution reaction between the grafted PHEMA and 5-chloromethyl-8-hydroxyquinoline（CHQ） was carried out,and the 8-hydroxyquinoline-functionalization transformation of the grafted particles PHEMA/SiO2 was realized,preparing the functional grafted particles HQ-PHEMA/SiO2.The strong chelating adsorption property of HQ-PHEMA/SiO2 towards Cd2＋ ion was deeply investigated.On that basis,the ion imprinting towards the functional grafted macromolecules HQ-PHEMA was conducted with Cd2＋ ion as the template ion and dichloroether as crosslinker by using the novel surface imprinting technique found by our research group,and Cd2＋ ion surface-imprinted material IIP-HQP/SiO2 was prepared.The ion recognition and combination characters of IIP-HQP/SiO2 were examined in detailed.The experimental results show that this ion imprinted material has excellent recognition selectivity and combination affinity for the template ion,Cd2＋ ion.Relative to Cu2＋ and Pb2＋ ions as two contrast ions,the selectivity coefficients of IIP-HQP/SiO2 for Cd2＋ ion reach up to 25.52 and 22.91,respectively,displaying ultrahigh ion recognition ability.