Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (03): 409-416.DOI: 10.6023/A12121106 Previous Articles     Next Articles

Article

具有高离子识别能力的镉离子表面印迹材料的制备及其离子识别机理的研究

房晓琳a, 高保娇a, 黄小卫b, 张永奇b, 顾来沅a   

  1. a 中北大学化学工程系 太原 030051;
    b 北京有色金属研究总院 北京 100088
  • 收稿日期:2012-12-27 出版日期:2013-03-14 发布日期:2013-01-04
  • 通讯作者: 高保娇 E-mail:gaobaojiao@126.com
  • 基金资助:

    项目受国家青年科学基金(No.51104023)资助.

Studies on Preparation of Cd2+ Ion Surface-Imprinted Material with High Ion Recognition Ability and Its Ion Recognition Mechanism

Fang Xiaolina, Gao Baojiaoa, Huang Xiaoweib, Zhang Yongqib, Gu Laiyuana   

  1. a Department of Chemical Engineering, North University of China, Taiyuan 030051;
    b General Research Institute for Nonferrous Metals, Beijing 100088
  • Received:2012-12-27 Online:2013-03-14 Published:2013-01-04
  • Supported by:

    Project supported by the National Science Foundation for Young Scientists of China (No. 51104023).

Hydroxyethyl methacrylate (HEMA) was graft-polymerized on micron-sized silica gel particles via surface- initiated 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.

Key words: heavy metal ion, ion surface-imprinting, graft polymerization, 8-hydroxyquinoline, chelation adsorption, ion recognition