Highly blue fluorescence carbon dots (CDs-MCM) were successfully prepared via a simple hydrothermal method with citric acid and ethylene diamine tetraacetic acid doped mesoporous silica MCM-41. The CDs-MCM exhibited uniform particle size and possessed good excitation-dependent characteristic. It showed highly selectivity and sensitivity in detection of Cr(VI), folic acid and good linear ranges of 0–37.5[Formula: see text][Formula: see text]M ([Formula: see text]) and 0–50[Formula: see text][Formula: see text]M ([Formula: see text]). The low detection limits were 79.31[Formula: see text]nM and 118.73[Formula: see text]nM for Cr(VI) and folic acid, respectively. It revealed that inner filter effect dominated in Cr(VI) quenching of the CDs-MCM fluorescent, while that of folic acid belonged to static quenching. The CDs-MCM were successfully used to detect the Cr(Vl) and folic acid in water and vegetable samples with satisfactory results. It provided new insight into environmental Cr(VI) and folic acid detection.

中文翻译：

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新型介孔二氧化硅荧光碳点的水热合成及其在 Cr(VI) 和叶酸检测中的应用

采用柠檬酸和乙二胺四乙酸掺杂的介孔二氧化硅MCM-41，通过简单的水热法成功制备了高蓝色荧光碳点（CDs-MCM）。CDs-MCM表现出均匀的粒径并具有良好的激发依赖性特征。对Cr(VI)、叶酸的检测具有较高的选择性和灵敏度，线性范围为0-37.5[分子式：见正文][分子式：见正文]M（[分子式：见正文]）和0-50[公式：见正文][公式：见正文]M（[公式：见正文]）。Cr(VI) 和叶酸的低检测限分别为 79.31[公式：见正文]nM 和 118.73[公式：见正文]nM。结果表明，CDs-MCM荧光的Cr(VI)猝灭以内滤效应为主，而叶酸则属于静态猝灭。CDs-MCM成功地用于检测水和蔬菜样品中的Cr(VI)和叶酸，结果令人满意。它为环境 Cr(VI) 和叶酸检测提供了新的见解。