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Enhanced visible-light photocatalytic activity of g-C3N4-ZnWO4 by fabricating a heterojunction: investigation based on experimental and theoretical studies

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons58646

Jia,  Chunjiang
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Sun, L., Zhao, X., Jia, C., Yixuan, Z., Cheng, X., Li, P., et al. (2012). Enhanced visible-light photocatalytic activity of g-C3N4-ZnWO4 by fabricating a heterojunction: investigation based on experimental and theoretical studies. Journal of Materials Chemistry, 22(44), 23428-23438. doi:10.1039/c2jm34965e.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-F0D2-2
Abstract
We present a systematic investigation of the microscopic mechanism of interface interaction, charge transfer and separation, as well as their influence on the photocatalytic activity of heterojunctions by a combination of theoretical calculations and experimental techniques for the g-C3N4-ZnWO4 composite. HRTEM results and DFT calculations mutually validate each other to indicate the reasonable existence of g-C3N4 (001)-ZnWO4 (010) and g-C3N4 (001)-ZnWO4 (011) interfaces. The g-C3N4-ZnWO4 heterojunctions show higher photocatalytic activity for degradation of MB than pure g-C3N4 and ZnWO4 under visible-light irradiation. Moreover, the heterojunctions significantly enhance the oxidation of phenol in contrast to pure g-C3N4, the phenol oxidation capacity of which is weak, clearly demonstrating a synergistic effect between g-C3N4 and ZnWO4. Interestingly, based on the theoretical calculations, we find that electrons in the upper valence band can be directly excited from g-C3N4 to the conduction band, that is, the W 5d orbital of ZnWO4, under visible-light irradiation, which should yield well-separated electron-hole pairs, with high photocatalytic performance in g-C3N4-ZnWO4 heterojunctions as shown by our experiment. The microcosmic mechanisms of interface interaction and charge transfer in this system can be helpful for fabricating other effective heterostructured photocatalysts.