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Polyethyleneimine-Protected Ag 2 S Quantum Dots for Near-Infrared Fluorescence-Enhanced Detection of Trace-Level Hg 2+ in Water
Journal of Water Chemistry and Technology ( IF 0.5 ) Pub Date : 2020-06-06 , DOI: 10.3103/s1063455x20010105
J. Q. You , D. Yan , Y. He , J. G. Zhou , Y. L. Ge , G. W. Song

Abstract

In this work, we have developed a near-infrared emissive polyethyleneimine capped Ag2(PEI-Ag2S QD) quantum dots based chemosensor for sensing trace-level Hg2+ in water by taking advantage of the metal-induced aggregation strategy. The fluorescence determination of Hg2+ by PEI-Ag2S QD at different pH (pH 4, 7, and 10) were performed, respectively. Under the optimum conditions, the selectivity of this system for Hg2+ over other metal ions in aqueous solutions was remarkably high, and its detection limits was 0.5 nM at pH 4. In addition, the present approach provides the advantages of rapidity, simplicity, low background and low cost. The assay also offers great potential for specific detection of Hg2+ in real water samples. This developed PEI-Ag2S QD-based method presages more opportunities for application in environmental systems.


中文翻译:

聚乙烯亚胺保护的Ag 2 S量子点用于近红外荧光增强检测水中的痕量Hg 2+

摘要

在这项工作中,我们已经开发了一种基于近红外发射聚乙烯亚胺的Ag 2(PEI-Ag 2 S QD)量子点化学传感器,该传感器利用金属诱导的聚集策略来感测水中的痕量Hg 2+。通过PEI-Ag 2 S QD在不同pH(pH 4、7和10)下分别进行Hg 2+的荧光测定。在最佳条件下,该系统对Hg 2+的选择性水溶液中其他金属离子的检测限非常高,其检测极限在pH 4时为0.5 nM。此外,本方法具有快速,简便,背景低且成本低的优点。该检测方法还具有很大的潜力,可用于特异性检测实际水样中的Hg 2+。这种基于PEI-Ag 2 S QD的开发方法预示了在环境系统中应用的更多机会。
更新日期:2020-06-06
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