CdSe量子点的合成及其在重金属离子检测中的应用

以3-巯基丙酸（3-MPA）为修饰剂合成了水溶性CdSe量子点,优化了合成条件,并以其为荧光探针建立了水样中Pb²⁺和Hg²⁺的检测方法。实验结果表明：在n（Se）∶n（Cd²⁺）为1∶6、n（Se）∶n（NaBH₄）为1∶3、n（Cd²⁺）∶n（3-MPA）为1∶6、反应pH为11、回流温度为100 ℃、回流时间为60 min的优化条件下合成的量子点荧光性能较优;量子点的荧光猝灭强度与Pb²⁺或Hg²⁺的质量浓度呈良好的线性关系,线性范围分别为0.005~10 mg/L和0.001~1 mg/L,检出限分别为0.003 mg/L和0.001 mg/L,相对标准偏差分别为1.23%和1.29%,可应用于实际水样中Pb²⁺和Hg²⁺的检测。

Synthesis of CdSe quantum dot and its application in heavy metal ion detection

The water-soluble CdSe quantum dots（QDs）were synthesized using 3-mercaptopropionic acid（3-MPA）as stabilizer and the synthesis conditions were optimized. Using QDs as fluorescence probes,the method for detection of Pb²⁺ and Hg²⁺ in water was established. The experimental results show that：Under optimal conditions of n（Se）∶n（Cd²⁺）=1∶6,n（Se）∶n（NaBH₄）=1∶3,n（Cd²⁺）∶n（3-MPA）=1∶6,reaction pH 11,circumfluence temperature 100 ℃ and circumfluence time 60 min,the QDs exhibit highly efficient fluorescence performance;Good linear relationships are found between the QDs fluorescence quenching intensity and the mass concentration of Pb²⁺ or Hg²⁺;The linear range is 0.005-10 mg/L and 0.001-1 mg/L,the detection limit is 0.003 mg/L and 0.001 mg/L,and the relative standard deviation is 1.23% and 1.29%,respectively;As an application,the proposed method is reliable for detection of Pb²⁺ and Hg²⁺ in actual water samples.