Influence of N doping and the functional groups of graphene on a RGO/TiO_2 composite photocatalyst 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Science China Technological Sciences
页码
1-10
作者单位
School of Petroleum Engineering, Changzhou University;
作者
TANG Bo;HE YanFeng;ZHANG ZhenYu;WANG ZhengWei;JI Li;MA TingTing;LI Sen;DAI YuanZhe;ZHANG GuoLiang;
摘要
Reduced graphene oxide(RGO) assisted TiO_2 composite photocatalysts have attracted increased attention because of their high photocatalytic performance under both UV-and visible-light irradiation. However, the corresponding properties under the long wavelength irradiation is far from expected. In this study, a series of RGO samples with well-designed N impurity and optimized surface functional groups are prepared and employed during hybridization with TiO_2(named N-RGO/TiO_2). The coupling between the doped N atoms and surface functional groups is analyzed based on the resulting photocatalytic performances, and the specific mechanism is revealed by the EPR, IR and lifetime of the photoinduced electrons. After comparing the corresponding performances of the RGO/TiO_2 and RGO/N-TiO_2 specimens, the results show that the surface functional groups of the RGO serve as a precondition to achieve π-d coupling between the graphene basal plane and TiO_2 nanoparticles, while N atoms in the RGO enhance the resulting photoactivity under a long wavelength range(>510 nm). The findings provide a potential approach to promote the photocatalytic properties of graphene-based composite photocatalysts with the low-energy incident photons.
机翻摘要
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关键词/主题词
graphene;surface functional group;N doping;coupling;photocatalyst
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