Abstract A novel fluorescence method was for the first time established for the efficient determination of permanganate (Mn(VII)) based on sulfur, chlorine and nitrogen co-doped carbon quantum dots (S,Cl,N-CQDs). The S,Cl,N-CQDs was prepared via a fast and simple acid-base neutralization method. The fluorescence of S,Cl,N-CQDs could be dramatically quenched by Mn(VII) ascribed to a combination of inner filter effect (IFE) and dynamic quenching. Under the optimal working conditions, the S,Cl,N-CQDs-based nanoprobe exhibited high selectivity and sensitivity towards Mn(VII) sensing. A good linear Stern-Volmer equation was obtained for Mn(VII) in a wide concentration range of 0.05–110 μM with a detection limit as low as 12.8 nM. The proposed fluorescence method also exhibits additional advantages of great simplicity, fast in analysis and low cost. The as-fabricated fluorescent nanoprobe was successfully applied for the determination of Mn(VII) in vegetable, cereal and tea samples with high accuracy. It is anticipated that the S,Cl,N-CQDs-based nanoprobe could be further exploited to construct a nanoprobe device for Mn(VII) monitoring in complex food matrix.

中文翻译：

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以碳量子点为纳米探针的高灵敏度超选择性荧光法测定食品中的锰 (VII)

摘要 首次建立了一种基于硫、氯、氮共掺杂碳量子点(S,Cl,N-CQDs)高效测定高锰酸盐(Mn(VII))的新型荧光方法。S,Cl,N-CQDs 是通过一种快速简单的酸碱中和方法制备的。S,Cl,N-CQDs 的荧光可以被 Mn(VII) 显着淬灭，这归因于内部过滤效应 (IFE) 和动态淬灭的组合。在最佳工作条件下，基于 S,Cl,N-CQDs 的纳米探针对 Mn(VII) 传感表现出高选择性和灵敏度。Mn(VII) 在 0.05–110 μM 的宽浓度范围内获得了良好的线性 Stern-Volmer 方程，检测限低至 12.8 nM。所提出的荧光方法还表现出非常简单、分析速度快和成本低的额外优点。所制备的荧光纳米探针已成功应用于蔬菜、谷物和茶叶样品中锰 (VII) 的高精度测定。预计可以进一步利用基于 S,Cl,N-CQDs 的纳米探针来构建用于复杂食物基质中 Mn(VII) 监测的纳米探针装置。