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Open AccessArticle

Antioxidant Activity of Graphene Quantum Dots Prepared in Different Electrolyte Environments

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1708;
Received: 8 November 2019 / Revised: 24 November 2019 / Accepted: 26 November 2019 / Published: 29 November 2019
Antioxidants can reduce or inhibit damage such as oxidative decay caused by elevated levels of free radicals. Therefore, pursuing antioxidants with excellent properties has attracted more and more attention. Graphene quantum dots (GQDs) are considered a promising material because of their good free radical scavenging activity, low toxicity, and excellent water solubility. However, their scavenging efficiency, antioxidant mechanism, and effective control methods need to be improved. Herein, in order to further reveal the antioxidant mechanism of GQDs, the role of electrolytes in improving the antioxidant activity of GQDs is explored. In addition, 1,1-diphenyl-2-picrazine (DPPH∙), hydroxyl (∙OH), and superoxide (∙O2) free radicals are used to evaluate the antioxidant activity of the as-prepared GQDs. Combined with transmission electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, and cyclic volt–ampere characteristic curves, the effects of an electrolytic environment on the surface functional groups, charge transfer capability, and defect states of GQDs are obtained. The antioxidant mechanism of GQDs and how to improve their antioxidant activity are further elucidated. View Full-Text
Keywords: GQDs; free radical scavenging; antioxidant; electrochemical method GQDs; free radical scavenging; antioxidant; electrochemical method
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Zhao, L.; Wang, Y.; Li, Y. Antioxidant Activity of Graphene Quantum Dots Prepared in Different Electrolyte Environments. Nanomaterials 2019, 9, 1708.

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