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Abstract：
In this work, it is presented for the first time that nitrogen and chlorine co-doped carbon nanodots (N,Cl-CDs) were synthesized by simply mixing glucose, concentrated hydrochloric acid (HCl), and 1,2-ethylenediamine (EDA). No external heat was employed; the neutralization reaction served as the heat source. The glucose served as the carbon source while EDA and HCl were the N and Cl dopants, respectively. The fluorescence of N,Cl-CDs was adequately quenched by hexavalent chromium Cr(VI) based on a combination of dynamic quenching and inner filter effect (IFE). Accordingly, an efficient N,Cl-CDs-based fluorescence probe was established for sensitive and selective detection of Cr(VI). The proposed fluorescence sensor provides a linear recognition range for Cr(VI) determination from 3 to 40 µM with a limit of detection (LOD) of 0.28 µM (14.6 µg/L). The proposed fluorescence method was successfully utilized to detect Cr(VI) in different water samples with satisfactory results. The spike recoveries vary from 97.01% to 103.89% with relative standard deviations (RSDs) of less than 0.82%. This work highlights the development of a simple, ultrafast, and energy-saving one-step synthetic route to fabricate N,Cl-CDs for highly selective and sensitive detection of Cr(VI) in real water samples. It is anticipated that the proposed fluorescence method could be further explored and widely used for Cr(VI) detection in the environmental industry.
摘要：
在这项工作中,首次提出了氮和氯共掺杂的碳纳米点(N，Cl-CD)是通过简单混合葡萄糖合成的，浓盐酸(HCl),和1,2-乙二胺(EDA)。不使用外部热量;中和反应充当热源。葡萄糖作为碳源，而EDA和HCl是N和Cl掺杂剂，分别。N的荧光,基于动态淬火和内部过滤效应（IFE）的组合，Cl-CD被六价铬Cr（VI）充分淬火。因此，一个有效的N，建立了基于Cl-CD的荧光探针，用于灵敏，选择性地检测Cr（VI）。拟议的荧光传感器为Cr（VI）测定提供了3至40µM的线性识别范围，检测限（LOD）为0.28µM（14.6µg/L）。所提出的荧光法成功地检测了不同水样中的Cr（VI），结果令人满意。加标回收率从97.01％到103.89％不等，相对标准偏差（RSD）小于0.82％。这项工作突出了一个简单的开发，超快，和节能一步合成路线制备N，Cl-CD用于高选择性和灵敏地检测实际水样中的Cr(VI)。预计所提出的荧光法可以进一步探索并广泛用于环境工业中的Cr（VI）检测。
