数字农科院2.0

Nitrogen-Sulfur Co-Doped Ph-Insensitive Fluorescent Carbon Dots For High Sensitive And Selective Hypochlorite Detection

文献类型： 外文期刊

作者： Shi, LY; Zhou, GH; Xiang, X; Zhang, Z; Jia, YM; Liu, PL; Li, ZG

作者机构：

关键词： Carbon Dots; Free Chlorine; Fluorescent Detection; Hypochlorite; Ph

期刊名称： SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

ISSN： 1386-1425

年卷期： 2020 年 242 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Carbon dots (CDs) are novel fluorescent carbon nanomaterial with exceptional properties and have drawn great attention in recent years. However, the preparation and applications of high-quality carbon dots remain challenging. Here, we describe a simple hydrothermal synthesis route using citric acid as a carbon source for stable fluorescent CDs. The CDs are modified with glutathione and exhibit high fluorescent quantum yields (30.2%) and excellent photo-stability. In addition, the fluorescence intensity of CDs remains stable over a wide range of pH values (3-12). Hypochlorite (ClO-) can effectively quench the fluorescence of the CDs by destroying the pyrrolic ring and conjugate structure of the CDs. Thus, the CDs can be used to detect ClO-. Under optimized conditions, the fluorescence intensity changes of CDs correspond selectively to ClO- in the range of 100-800 nmol/L with a LOD of 16 nmolit Practical applications of the proposed method for free chlorine detection in tap water show similar results and recovery compared to the standard DPD-based method. These results suggest that the pH-insensitive CDs prepared via this facile procedure are a promising chemosensor for free chlorine and have great potential in analytical applications. (C) 2020 Elsevier B.V. All rights reserved.

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