Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (4): 357-364.DOI: 10.15541/jim20160349

• Orginal Article • Previous Articles     Next Articles

Preparation and Photocatalytic Properties of Mesoporous RGO/TiO2 Composites

LI Cui-Xia, JIN Hai-Ze, YANG Zhi-Zhong, YANG Xuan, DONG Qi-Zheng, LI Ting-Ting   

  1. (Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China)
  • Received:2016-06-01 Revised:2016-07-27 Published:2017-04-20 Online:2017-03-24
  • Supported by:
    National Natural Science Foundation of China (21301084);Fund of the State Key Laboratory of Advanced Processing and Recycycling of Non-ferrous Metals, Lanzhou University of Technology(SKLAB02015010)

Abstract:

A series of mesoporous graphene oxide/TiO2 composites (GO/TiO2) with different mass fractions of graphene oxide (GO) were synthesized by an in-situ synthesized Sol-Gel step using GO, tetrabutyl titanate (TBT) as precursors, polyvinylpyrrolidone (PVP) as frame developing agent and citric acid as hydrolysis inhibitor and surfactant. Afterwards, mesoporous reduced graphene oxide/TiO2 (RGO/TiO2) composites were obtained by ultraviolet radiation reduction method. The composites were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), UV-visible diffuse reflectance spectroscope (UV-Vis DRS), and photoluminescence (PL) spectroscopy technology. The morphology and pore size distribution of RGO/TiO2 and the effects of RGO on the lifetime of photogenerated electron-hole pairs, adsorption capacity and photocatalytic activity of composite photocatalysts were investigated. The photocatalytic activity was evaluated under ultraviolet light and sunlight irradiation. Then the recovery test was studied under ultraviolet light irradiation. Results show that TiO2 nanoparticles are well dispersed on the surface of the RGO sheets and RGO/TiO2 composites are mesoporous materials. The introduction of RGO effectively inhibits the recombination of photogenerated electron-hole pairs and improves the adsorption capacity and photocatalytic activity of composites. The 7wt% RGO/TiO2 shows the best adsorption capacity for methyl orange. And 5wt% RGO/TiO2 shows the best and stable photocatalytic activity, after four recovery test, its photocatalytic degradation of methyl orange under ultraviolet light irradiation for 50 min exceeded 90% of the first test.

Key words: reduced graphene oxide, titanium dioxide, mesoporous, ultraviolet light, sunlight

CLC Number: