ZnS∶Mn量子点表面印迹杂化膜的研制及其在荧光识别4-硝基苯酚中的应用

采用工艺简单的水相合成法制备ZnS∶Mn量子点,并在量子点表面进行硅烷化处理,包覆一层分子印迹聚合物.将量子点与壳聚糖混合,在石英玻片上沉积,制备杂化膜,并用于4-硝基苯酚的快速测定,线性范围为1.0～8.0 μmol/L;检出限为41 nmol/L.此膜表现出较好的灵敏度和良好的选择性.此杂化膜具有良好的稳定性、重复使用性和可逆再生性,在无水乙醇中浸泡即可实现再生.本方法用于环境样品中4-对硝基苯酚的测定,回收率为95.5％～103.0％.

Preparation of Hybrid Membrane Containing Mn-Doped ZnS Quantum Dots Capped by Imprinting Polymer and Their Application for Fluorescence Recognition of 4-Nitrophenol

Mn-doped ZnS quantum dots(QDs) capped by a molecularly imprinted polymer(MIP) were synthesized,then QDs and chitosan were mixed,and the hybrid membrane was fabricated onto the quartz surface.A fast,sensitive and selective method was established to detect trace 4-nitrophenol(4-NP) based on the fluorescence quenching of hybrid membrane by 4-NP.In addition,a good linear relationship between fluorescence response and concentration of 4-NP could be obtained in the range from 1.0 to 8.0 μmol/L,the detection limit was 41 nmol/L.The hybrid membrane is stable and can be regenerated by immersing into ethanol.The method was also used in the real water samples,and the recoveries can fall in the range of 95.5%-103.0%.