TiO2/g-C3N4 heterojunctions: In situ fabrication mechanism and enhanced photocatalytic activity
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- 作者：Li-Cheng Wu ; Hang Zhao ; Li-Guo Jin ; Huan-Yan Xu
- 刊名：Frontiers of Materials Science
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：10
- 期：3
- 页码：310-319
- 全文大小：441 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science
Chemistry
Chinese Library of Science - 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
- ISSN：2095-0268
- 卷排序：10
文摘
In situ fabrication of TiO2/g-C3N4 (TCN) heterojunctions was achieved by a modified sol-gel method. TG analysis was employed to determine the content of TiO2 in TCN composites. XRD, FTIR, TEM and HRTEM were used to analyze the phase composition, functional groups, morphology and microstructure of as-obtained products, respectively. Based on the measurement of surface Zeta potential of g-C3N4, a possible mechanism on in situ fabrication of TCN heterojunctions was concluded. The control experiments indicated that TCN heterojunctions exhibited better photocatalytic performance than either TiO2 or g-C3N4, suggesting that the enchanced photocatalytic activity could be realized by TCN heterojunctions. Then, the evaluation of parameters affecting the photocatalytic performance of TCN heterojunctions was investigated. Even after five cycles, TCN heterojunctions still maintained high photocatalytic activity, exhibiting the good photocatalytic stability. UV-vis absorption spectra showed that almost all MB molecules were decomposed in the photocatalytic process. Finally, the possible mechanism on enhanced photocatalytic performance of TCN heterojunctions was discussed.KeywordsTiO2g-C3N4heterojunctionsphotocatalytic mechanism