抗坏血酸
铬
钴
化学
荧光
猝灭(荧光)
碳纤维
材料科学
无机化学
核化学
有机化学
食品科学
复合材料
光学
复合数
物理
作者
Guangkuo Hu,Liya Ge,Yuanyuan Li,Masood Mukhtar,Bing Shen,Desheng Yang,Jiangong Li
标识
DOI:10.1016/j.jcis.2020.06.034
摘要
Fluorescent detections of cobalt, chromium, and ascorbic acid by carbon dots are of importance for human health and environment. Green synthesis of fluorescent carbon dots from biomass is essential for their sustainable applications. Herein, carbon dots were successfully prepared by a simple hydrothermal method using flax straw as carbon source. The obtained carbon dots possess a much higher quantum yield (20.7%) and excitation-dependent photoluminescence behavior. The “on-off” fluorescence principle, quenching of the fluorescence intensity of the carbon dots in the presence of Co2+ or Cr6+ based on static quenching effect and inner filter effect, is extended to “on-off-on” principle for detection of ascorbic acid based on the reduction of Cr6+ to Cr3+ by ascorbic acid. The linear ranges for detections of Co2+, Cr6+, and ascorbic acid are 0–500, 0.5–80, and 0–200 μM, and the limits of the corresponding detections are 0.38, 0.19, and 0.35 μM, respectively. Compared with most reported fluorescence detections, our linear ranges are significantly wider and our detection limits are much lower for the detections of Co2+, Cr6+, and ascorbic acid. This sensing platform is highly sensitive and selective to monitor Co2+ and Cr6+ in real water and ascorbic acid in vitamin C tablets with remarkable practicality.
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