氮硼共掺杂碳量子点的制备及其对六价铬的检测

Preparation of nitrogen-boron-doped carbon quantum dots and its application for hexavalent chromium detection

中文关键词:  氮硼共掺杂碳量子点  六价铬  内滤效应  荧光传感器

英文关键词:nitrogen-boron-doped carbon quantum dots  hexavalent chromium  internal filtration effect  fluorescence sensor

中文摘要:

      目的 建立一种基于荧光碳量子点的快速检测方法, 定量检测饮用水和食品中的六价铬[hexavalent chromium, Cr(Ⅵ)]。方法 以无水柠檬酸和3-氨基苯硼酸分别作为碳、氮和硼源, 通过一步水热法合成氮硼共掺杂碳量子点(nitrogen-boron-doped carbon quantum dots, N,B-CQDs), 基于荧光内滤效应对Cr(Ⅵ)进行检测。结果 在优化后的最佳检测条件下, N,B-CQDs对Cr(Ⅵ)在0.01~10.00 mg/L内呈现良好的线性关系, 检出限低至3.81 μg/L, 表现出选择性好、灵敏度高等特点。将此方法应用于饮用水、白醋和虾皮中Cr(VI)含量的测定, 加标回收率在85.8%~112.3%之间, 相对标准偏差低于5%。结论 本研究制备的N,B-CQDs在Cr(VI)检测方面具有检出限低、灵敏度高、选择性好等优点, 可以为Cr(VI)快速检测提供一定的理论和技术参考。

英文摘要:

      Objective To establish a rapid detection method based on fluorescent carbon quantum dots for the quantitative determination of hexavalent chromium [Cr(VI)] in water and food stuffs. Methods Nitrogen-boron- doped carbon quantum dots (N,B-CQDs) were synthesized by a one-step hydrothermal method using anhydrous citric acid and 3-aminobenzeneboronic acid as carbon, nitrogen and boron sources, respectively. Cr(VI) was quantitatively detected based on the fluorescence internal filtration effect. Results Under the optimal detection conditions, N,B-CQDs showed a good linear relationship with Cr(VI) in the range of 0.01?10.00 mg/L, and the limit of detection was as low as 3.81 μg/L, showing the characteristics of good selectivity and high sensitivity. The method was applied to the determination of Cr(VI) in water, white vinegar and shrimp skin. The recoveries of Cr(VI) were 85.8%?112.3%, and the relative standard deviation was less than 5%. Conclusion The N,B-CQDs prepared in this study has the advantages of low limit of detection, high sensitivity and good selectivity in the detection of Cr(VI), which can provide a theoretical and technical reference for Cr(VI) rapid detection.