反相悬浮聚合法制备硫氰酸根阴离子印迹微球及其离子识别性质

doi:10.11944/j.issn.1000-0518.2015.08.140387

摘要/Abstract

摘要：

利用反相悬浮聚合法, 成功制备了微米级硫氰酸根(SCN^-)阴离子印迹微球。以溶有分散剂Span-60的环已烷为分散介质, 以溶有模板阴离子SCN^-、阳离子单体丙烯酰氧乙基三甲基氯化铵(DAC)及交联剂N, N'-亚甲基双丙烯酰胺(MBA)的水溶液为分散相, 构成反相悬浮聚合体系, 在水相液滴中使DAC发生交联聚合, 成功制备了粒径约为200 μm的离子印迹微球(IIPMs)。以同为一价阴离子的NO₃^- 和I^-为对比离子, 深入考察研究了该离子印迹微球的离子识别与结合特性。研究结果表明, 凭借强静电相互作用, 在水相液滴中, 阳离子单体DAC与模板阴离子SCN^-紧密相结合, 故在DAC交联聚合的同时, 实现了阴离子SCN^-的印迹。所制备的阴离子印迹微球IIPMs对模板阴离子SCN^-具有很高的结合能力(结合容量为3.3 mmol/g(192 mg/g))和特异的识别选择性。该印迹微球可选择性地识别与结合离子混合溶液中的SCN^-离子, 相对于NO₃^-和I^-阴离子, IIPMs对SCN^-阴离子的选择性系数分别为3.24和6.78。该印迹微球还具有优良的重复使用性能。

关键词: 反相悬浮聚合, 印迹微球, 静电相互作用, 离子印迹, 离子识别

Abstract:

Micron-sized thiocyanate anion-imprinted microspheres(IIPMs) were prepared successfully with inverse suspension polymerization method. In the inverse suspension polymerization system, cyclohexane was used as dispersion medium and Span-60 was used as dispersant in the oil phase, cationic monomer of acryloxyethyltrimethyl ammonium chloride(DAC), the crosslinker N, N'-methylene bisacrylamide(MBA) and the template SCN^- anion were dissolved in aqueous phase. The crosslinking copolymerization of DAC in water-in-oil droplets was carried out and SCN^- IIPMs with diameter of about 200 μm were obtained. The ion recognition selectivity and binding property were investigated with monovalent anions, NO₃^- and I^-, as the references. In water-in-oil droplets, since cationic monomer DAC associates with SCN^- anion by strong electrostatic interaction, SCN^- anions are imprinted while DAC produces crosslinking polymer. The prepared IIPMs possess strong binding ability(3.3 mmol/g(192 mg/g)) and selectivity. The IIPMs can selectively recognize and bind SCN^- anion from a mixture with NO₃^- and I^- ions. The coefficients of the selectivity of IIPMs are 3.24 and 6.78, respectively. The IIPMs also exhibit excellent reusability.

Key words: reversed phase suspension, imprinted microspheres, electrostatic interaction, ion imprinting, ion recognition

中图分类号:

徐锐, 杨青, 李延斌, 高保娇. 反相悬浮聚合法制备硫氰酸根阴离子印迹微球及其离子识别性质[J]. 应用化学, 2015, 32(8): 931-939.

XU Rui, YANG Qing, LI Yanbin, GAO Baojiao. Preparation of Thiocyanate Anion-Imprinted Microspheres via Inverse Suspension Polymerization and Their Ion Recognition Characteristics[J]. Chinese Journal of Applied Chemistry, 2015, 32(8): 931-939.

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