Publication: A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots
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Issued Date
2021
Resource Type
Language
eng
File Type
application/pdf
ISSN
24701343
Other identifier(s)
2-s2.0-85108792913
Rights Holder(s)
Scopus
Bibliographic Citation
ACS Omega. Vol 6, No.22 (2021), p.14379-14393
Suggested Citation
Kongsanan N., Pimsin N., Keawprom C., Sricharoen P., Areerob Y., Nuengmatcha P., Oh W.-C., Chanthai S., Limchoowong N. A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots. ACS Omega. Vol 6, No.22 (2021), p.14379-14393. doi:10.1021/acsomega.1c01242 Retrieved from: https://hdl.handle.net/20.500.14740/7346
Abstract
This study aims to use graphene quantum dots (GQDs) as a fluorescence switching sensor (turn on-off) for the simultaneous detection of cyanide (CN-) and ferricyanide [Fe(CN)6]3- in wastewater samples. The GQDs were synthesized by pyrolyzing solid citric acid. The intrinsic blue color of the solution was observed under ultraviolet irradiation. The fluorescence spectrum was maximized at both excitation and emission wavelengths of 370 and 460 nm, respectively. The fluorescence intensity of GQDs decorated with Hg2+ (turn-off mode as the starting baseline) could be selectively turned on in the presence of CN- and once back to turn-off mode by [Fe(CN)6]3-. The fluorescence switching properties were used to develop a fluorescence turn-on-off sensor that could be used to detect trace amounts of CN- and [Fe(CN)6]3- in water samples. For highly sensitive detection under optimum conditions (Britton-Robinson buffer solution in the pH range of 8.0-9.0, linearity ranges of 5.0-15.0 μM (R2 = 0.9976) and 10.0-50.0 μM (R2 = 0.9994), respectively, and detection limits of 3.10 and 9.48 μM, respectively), good recoveries in the ranges of 85.89-112.66% and 84.88-113.92% for CN- and [Fe(CN)6]3-, respectively, were recorded. The developed methods were successfully used for the simultaneous and selective detection of CN- and [Fe(CN)6]3- in wastewater samples obtained from local municipal water reservoirs. ©