A facile synthesis of g-C3N4/TiO2 hybrid photocatalysts by sol-gel method and its enhanced photodegradation towards methylene blue under visible light

作者：Li, Chunquan; Sun, Zhiming^*; Xue, Yanlei; Yao, Guangyuan; Zheng, Shuilin

来源：Advanced Powder Technology, 2016, 27(2): 330-337.

DOI：10.1016/j.apt.2016.01.003

• g-C3N4/TiO2
• Photodegradation
• Visible light
• Methylene blue

The g-C3N4/TiO2 hybrid photocatalysts were synthesized through a modified sol-gel technique with varying the weight ratio of g-C3N4 under facile conditions. The microstructure and interface properties of the obtained photocatalysts were systematically studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR) and UV-visible diffused reflectance spectroscopy (UV-vis DRS). It is indicated that the heterojunction between g-C3N4 and TiO2 formed and the TiO2 nanoparticles well dispersed on g-C3N4 sheets. Among as synthesized hybrid photocatalysts, the g-C3N4/TiO2-80% sample exhibited the highest photocatalytic activity under visible light irradiation using methylene blue as the target pollutant. Compared with pure g-C3N4 and TiO2, the g-C3N4/TiO2-80% hybrid photocatalyst exhibited enhanced visible-light photoactivity, which is around 3.5 times as high as that of the pure g-C3N4. The enhancement of the g-C3N4/TiO2 hybrid photocatalysts can be attributed to the relatively higher adsorption capacity and effective separation of photogenerated electron-hole pairs. The g-C3N4/TiO2 hybrid photocatalysts exhibited stable photocatalytic performance with a very low activity loss after going through five cycles, which shows that it is a promising material for the photodegradation of dyes in wastewater.

• 出版日期2016-3
• 单位中国矿业大学（北京）