TiO2/g-C3N4 heterojunctions： In situ fabrication mechanism and enhanced photocatalytic activity

• Published in: Frontiers of materials science Vol. 10; no. 3; pp. 310 - 319
• Main Authors: Wu, Li-Cheng, Zhao, Hang, Jin, Li-Guo, Xu, Huan-Yan
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.09.2016
• Subjects: Chemistry and Materials Science; Materials Science; Research Article; TEM分析; TiO2; 光催化性能; 光催化活性; 制备机理; 原位制备; 异质结; 紫外-可见吸收光谱; TiO; photocatalytic mechanism; g-C; heterojunctions; N
• ISSN: 2095-025X; 2095-0268
• DOI: 10.1007/s11706-016-0351-y

In situ fabrication of TiO21g-C3N4 （TCN） heterojunctions was achieved by a modified sol-gel method. TG analysis was employed to determine the content of Ti02 in TCN composites. XRD, FTIR, TEM and HRTEM were used to analyze the phase composition, functional groups, morphology and microstructure of as-obtained pro- ducts, 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 heterojunctlons exhibited better photocatalytic performance than either Ti02 or g-C3N4, suggesting that the enchanced photocatalytic activity could be realized by TCN heterojunctionso 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.