Studies on Preparation of Cd2+ Ion Surface-Imprinted Material with High Ion Recognition Ability and Its Ion Recognition Mechanism
Received date: 2012-12-27
Online 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.
Fang Xiaolin , Gao Baojiao , Huang Xiaowei , Zhang Yongqi , Gu Laiyuan . Studies on Preparation of Cd2+ Ion Surface-Imprinted Material with High Ion Recognition Ability and Its Ion Recognition Mechanism[J]. Acta Chimica Sinica, 2013 , 71(03) : 409 -416 . DOI: 10.6023/A12121106
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