Carbon dots (CDs) were used to develop a sensitive sensing technique for detecting Cr(VI). CDs were made using a hydrothermal technique from citric acid and glutamic acid. These prepared CDs emitted blue fluorescence under excitation of 350 nm (λ_em = 420 nm), and the fluorescence quantum yield was 48.41%. Transmission electron microscope was used to examine the morphology of the CDs, which had an average size of 2.21 ± 0.39 nm. The elementary composition and bonding structure of the CDs were conducted by XPS and FT-IR spectrum. Cr(VI) quenched the fluorescence of CDs through a static quenching effect and an inner filter effect, allowing Cr(VI) to be detected quantitatively. This approach was used to detect Cr(VI) in two samples of water, with the findings demonstrating that it is reliable and accurate. The fluorescence intensity change was linearly related to the concentration of Cr(VI) in the range from 0.5 to 400 μM, with the detection limit being 0.10 μM. This approach has the virtues of wide detection range, low cost and fast response. The strategy has a great application prospect for detecting Cr(VI) in practical samples.

碳点 (CD) 用于开发一种灵敏的传感技术来检测 Cr(VI)。CD 是使用柠檬酸和谷氨酸的水热技术制成的。这些制备的 CD 在 350 nm (λ _em = 420 nm), 荧光量子产率为 48.41%。透射电子显微镜用于检查 CD 的形态，其平均尺寸为 2.21 ± 0.39 nm。通过 XPS 和 FT-IR 光谱分析了 CD 的元素组成和键合结构。Cr(VI) 通过静态猝灭效应和内部过滤效应猝灭 CD 的荧光，从而可以定量检测 Cr(VI)。该方法用于检测两个水样中的 Cr(VI)，结果表明该方法可靠且准确。荧光强度变化与Cr(VI)浓度呈线性关系，范围为0.5~400 μM，检测限为0.10 μM。该方法具有检测范围广、成本低、响应速度快等优点。