One-pot hydrothermal carbonization approach was employed to synthesize the blue-emission carbon dots derived from chitosan (Cs) and o-phenylenediamine (OPD). The Cs-based carbon dots (Cs–CDs) possessed a certain high quantum yield of 58% and exhibited excellent solubility, stability and fluorescence response in aqueous solutions. The Cs–CDs were designed as a sensor for Cr(VI) and H₂O₂ determination. The sensing strategy of Cr(VI) was based on the inner filter effect (IFE) and static quenching effect (SQE), showing a good linear correlation ranging from 1 to 130μM with a detection limit (LOD) of 0.91μM. In addition, the determination for H₂O₂ was attributed to the elimination of IFE (EIFE) due to the reduction reaction and the detection for H₂O₂ was in the linear range from 1.0 to 200.0μM with LOD of 0.51μM. Finally, the proposed designed sensor could be simply applied for detection of Cr(VI) and H₂O₂ in real samples.

中文翻译：

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用于检测 Cr(VI) 和 H2O2 的高量子产率荧光壳聚糖基碳点

采用一锅水热碳化方法合成了壳聚糖（Cs）和邻苯二胺（OPD）的蓝色发射碳点。Cs基碳点（Cs-CDs）具有58%的高量子产率，在水溶液中表现出优异的溶解性、稳定性和荧光响应。Cs-CD 被设计为用于 Cr(VI) 和 H ₂ O ₂测定的传感器。Cr(VI) 的传感策略基于内滤效应 (IFE) 和静态淬火效应 (SQE)，在 1 到 130 范围内表现出良好的线性相关性μM，检测限 (LOD) 为 0.91μM. 此外，H ₂ O ₂的测定归因于由于还原反应消除了 IFE (EIFE)，H ₂ O ₂的检测在 1.0 至 200.0 的线性范围内μM，LOD 为 0.51μM. 最后，所提出的设计传感器可以简单地应用于检测实际样品中的 Cr(VI) 和 H ₂ O ₂。