荧光性纳米金CdTe自组装膜制备及其对汞离子识别

发布时间：2018-08-09 09:30

【摘要】：采用水相合成法,以巯基乙酸作为稳定剂,直接在水相中合成碲化摌(CdTe)量子点,以壳聚糖为中介,借助化学键吸附作用,间接将CdTe量子点组装在纳米金自组装膜表面上,对该膜最佳组装条件及其荧光性能探讨,并将膜用于汞离子检测。实验结果表明,纳米金CdTe自组装膜的荧光强度随着加入汞离子浓度的增大而发生猝灭,汞离子在0~16×10~( 8)g/L浓度范围内,CdTe自组装膜与其呈现良好线性关系,相关系数为0.9991,检出限为1.56×10~( 10)g/L,该膜具有稳定性好、灵敏度高、可再生等优点。并应用此方法对水样中痕量汞检测,发现3个样品中汞离子含量均未超标,样品加标回收率是96.5%~98%,该方法适用于痕量汞的分析测定。
[Abstract]:In this paper, (CdTe) quantum dots were synthesized directly in water by aqueous phase synthesis method, and CdTe quantum dots were indirectly assembled on the surface of gold nanocrystalline self-assembled films by chemical bond adsorption, using chitosan as the medium, using thioglycolic acid as stabilizer. The optimum assembly conditions and fluorescence properties of the films were discussed, and the films were used for mercury ion detection. The experimental results show that the fluorescence intensity of nanocrystalline gold CdTe self-assembled films is quenched with the increase of the concentration of mercury ions, and there is a good linear relationship between the self-assembled films and the self-assembled films in the concentration range of 0 ~ (16 脳 10 ~ (- 8) g / L ~ (-1) Hg ~ (2 +). The correlation coefficient is 0.9991, the detection limit is 1.56 脳 10 ~ (10) g / L, and the film has the advantages of good stability, high sensitivity and reproducibility. The method was applied to the determination of trace mercury in water samples. It was found that the mercury ion content in the three samples was not exceeding the standard, and the recovery rate of the added standard was 96.5U 98. The method was suitable for the determination of trace mercury.
【作者单位】：莆田学院环境与生物工程学院;福建省新型污染物生态毒理效应与控制重点实验室;
【基金】：国家自然科学基金(31400318) 莆田市科技项目[2014S03(1)] 福建省自然科学基金(2017J0106)项目
【分类号】：X832;O657.3

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