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- W1963870910 abstract "The mediation effect of reduced graphene oxide (rGO) on the oxidative transformation of 1,4-hydroquinone (H2Q) to 1,4-benzoquinone (BQ) in aqueous solution was investigated using a batch method and electron paramagnetic resonance. The results showed that the autoxidation of H2Q was spin-restricted and extremely slow in acidic and neutral pH range, but this process can be dramatically accelerated when rGO was added. In the presence of 33.3 mg L−1 rGO, more than 76.0% of H2Q was oxidized to BQ within 36 h. The enhancement effects of rGO were attributed to the combined contribution of the high chemical reactivity of graphenic edges and defects on rGO and the high electron conductivity of graphene basal surface of rGO. It is proposed that dissolved oxygen reacted with graphenic edges and defects of rGO to produce surface-bound oxygen intermediates, which capture H atoms from the phenolic hydroxyl groups of H2Q and facilitate the generation of semiquinone radical (SQ−). The generated SQ− continued to transfer an electron to molecular oxygen to yield superoxide radical (O2−) and BQ. As a chain-carrying radical, O2− further reacted with H2Q to produce SQ− and H2O2." @default.
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- W1963870910 date "2015-08-01" @default.
- W1963870910 modified "2023-10-15" @default.
- W1963870910 title "Transformation of hydroquinone to benzoquinone mediated by reduced graphene oxide in aqueous solution" @default.
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- W1963870910 doi "https://doi.org/10.1016/j.carbon.2015.03.027" @default.
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