利用反相悬浮聚合法,成功制备了微米级硫氰酸根(SCN ˉ)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 ˉ、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Iˉ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 ˉ紧密相结合,故在DAC交联聚合的同时,实现了阴离子SCN ˉ的印迹.所制备的阴离子印迹微球IIPMs对模板阴离子SCN ˉ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 ˉ离子,相对于NO3ˉ和Iˉ阴离子,IIPMs对SCN ˉ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.
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