Abstract
Polyvinylpyrrolidone (PVP) and graphene (G)-modified iron oxides (Fe2O3-PVP-G) are prepared by a simple hydrothermal reaction. Their morphology and structure were examined and proved by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectroscopy. P-nitrophenol (p-NP) is a usual organic pollutant, which is highly toxic and difficult to decompose. Electrochemical reduction of p-NP is a widely used treatment, but the reduction products are still toxic. In this work, the electrochemical catalytic oxidation of p-NP was achieved on Fe2O3-PVP-G modified electrodes. Compared to pure Fe2O3, Fe2O3-PVP-G shows better catalytic performance, with a current density 10.4 times larger than that from Fe2O3. Electrochemical results verify that the improvement comes from the promotion of its activity and the favorable enrichment of p-NP with the help of the doped PVP and G. pH experiments indicate that p-NP is oxidized to aliphatic acid, which is non-toxic and environmentally friendly. Due to the protection of organic molecules, Fe2O3-PVP-G exhibits long-term stabilities on electrochemical oxidation on p-NP with the retention of 88.5% for 15 days. Our results also provide another perspective for studying electrocatalytic performances.
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This work is supported by Jiangsu Provincial Key R&D Project (BE2016187), Jiangsu Province Students’ Platform for Innovation and Entrepreneurship Training Program (202010300073), and (202110300299).
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Guo, Y., Li, Z., Wei, Y. et al. Polyvinylpyrrolidone and graphene-modified hematite nanoparticles for efficient electrocatalytic oxidation of p-nitrophenol. J Solid State Electrochem 26, 1051–1065 (2022). https://doi.org/10.1007/s10008-022-05146-6
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DOI: https://doi.org/10.1007/s10008-022-05146-6