Hydroxylated graphene quantum dots as fluorescent probes for sensitive detection of metal ions
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Highly sensitive methods are important for monitoring the concentration of metal ions in industrial wastewater. Here, we developed a new probe for the determination of metal ions by fluorescence quenching. The probe consists of hydroxylated graphene quantum dots (H-GQDs), prepared from GQDs by electrochemical method followed by surface hydroxylation. It is a non-reactive indicator with high sensitivity and detection limits of 0.01 μM for Cu2+, 0.005 μM for Al3+, 0.04 μM for Fe3+, and 0.02 μM for Cr3+. In addition, the low biotoxicity and excellent solubility of H-GQDs make them promising for application in wastewater metal ion detection.
Keywordsgraphene quantum dots surface hydroxylation metal ions detection fluorescent probes
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This work was financially supported by the National Natural Science Foundation of China (No. 21674011) and Beijing Municipal Natural Science Foundation (No. 2172040).
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