A biomass-derived porous carbon-based nanocomposite for voltammetric determination of quercetin
Porous carbon was prepared from wheat flour by alkali treatment and carbonization. The resulting biomass-derived porous carbon (BPC) was employed to prepare a Pt-Au-BPC nanocomposite by a hydrothermal method. The material was then placed on the surface of a carbon ionic liquid electrode (CILE). The Pt-Au-BPC was characterized by SEM, XPS, and the modified CILE by electrochemical methods. They revealed a porous structure, a large specific surface with high conductivity. Pt-Au-BPC/CILE was applied to the sensitive determination of quercetin. Electrochemical response was studied by cyclic voltammetry and differential pulse voltammetry (DPV). Under optimized experimental conditions, the oxidation peak current (measured at 0.48 V vs. Ag/AgCl by DPV) increases linearly in the 0.15 to 6.0 μM and in the 10.0 to 25.0 μM quercetin concentration range. The detection limit is 50.0 nM (at 3σ). The Pt-Au-BPC/CILE was applied to the direct determination of quercetin in ginkgo tablets sample and gave satisfactory results.
KeywordsBiomass-derived porous carbon Pt-Au-BPC nanocomposite Carbon ionic liquid electrode Electrochemistry Quercetin
This work was supported by the financial support of the National Natural Science Foundation of Hainan Province of China (2017CXTD007), the Key Science and Technology Program of Haikou City (2017042), Graduate Student Innovation Research Project of Hainan Province (Hys2018-212) and the Open Foundation of Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province (2019-003).
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