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200μm的离子印迹微球(IIPMs)。以同为一价阴离子的NO-3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NO-3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。
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 acryloxyethyhrimethyl 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） recognize and bind SCN^- anion from a mixture with NO3^- and ） and selectivity. The IIPMs can selectively I^- ions. The coefficients of the selectivity of IIPMs are 3.24 and 6.78, respectively. The IIPMs also exhibit excellent reusability.
出处
《应用化学》
CAS
CSCD
北大核心
2015年第8期931-939,共9页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金青年科学基金资助项目(21404093)~~
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
reversed phase suspension
imprinted microspheres
electrostatic interaction
ion imprinting
ion recognition
