Graphene quantum dots as on-off-on fluorescent probes for chromium(VI) and ascorbic acid

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• 作者：Shan Huang ; Hangna Qiu ; Fawei Zhu ; Shuangyan Lu ; Qi Xiao
• 关键词：Graphene quantum dots ; “On ; off ; on-fluorescent probe ; Chromium(VI) ; Ascorbic acid ; Quenching mechanism ; Inner filter effect
• 刊名：Microchimica Acta
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：182
• 期：9-10
• 页码：1723-1731
• 全文大小：1,065 KB
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• 作者单位：Shan Huang (1)
  Hangna Qiu (1)
  Fawei Zhu (1)
  Shuangyan Lu (1)
  Qi Xiao (1) (2)
  
  1. College of Chemistry and Material Science, Guangxi Teachers Education University, Nanning, 530001, People’s Republic of China
  2. State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

We report that graphene quantum dots (GQDs) are viable fluorescent probes for the determination of chromium(VI) and ascorbic acid in an on-off-on mode. The fluorescence of GQDs is strongly quenched by Cr(VI) mainly due to an inner filter effect and static quenching. This shifts the system to the “off-status. The quenching mechanism of this fluorescent system was investigated in some detail. Fluorescence intensity is inversely proportional to the concentration of Cr(VI) in the 0.05 to 500?μM concentration?range with a 3.7 nM detection limit. The fluorescence of GQDs-Cr(VI) system is converted back to “on-by adding ascorbic acid which will reduce yellow Cr(VI) ion, thereby eliminating the inner filter effect and static quenching. The relative intensity of restored fluorescence is directly proportional to the concentration of ascorbic acid in the 1.0 to 500?μM range, and the limit of detection is 0.51?μM. There are almost no interferences to commonly encountered other substances. The methods were applied to the determination of Cr(VI) in spiked tape, lake and river waters, and of?ascorbic acid in a tablet and human urine. Both gave satisfactory results.