本文利用pH响应的金属有机骨架材料UIO-66-NH2检测硫化钠,材料的分散液在没有目标物尿素存在时,体系的pH不发生改变,此时只能测到背景荧光信号;若加入目标物硫化钠时,硫化钠在溶液中水解使溶液的pH上升,此时UIO-66-NH2中配体上的邻位氨基去质子化使材料UIO-66-NH2在330 nm处激发时,在425 nm处产生发射信号增强的过程,基于此构建了对硫化钠快速检测的传感器.相比较于传统方法本实验设计的传感器步骤简便,操作简单耗时短可以实现硫化钠的快速检测而且具有方法的检测限低等优点.%We introduced a Turn-on fluorescensor to detect Sodium sulfide.In difference pH solution environment UIO-66-NH2 has different fluorescence intensity when extract in 330nm.In low pH,the weak fluorescence emission of UIO-66-NH2 is owing to the conjugated double bond system and the high mobility of the π-electrons.With increase of pH,are as-sumed to arise from deprotonation of imino group of 2-aminoterephthalic acid in UIO-66-NH2,which lead to enhance fluo-rescence intensity. The fluorescence intensity of the system has a relationship with the Sodium sulfide concentration with the linear range of 7.5~125×10-6 mol?L-1,the detection limit is 7.1×10-6mol?L-1.
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