Preparation and Photocatalytic Properties of Mesoporous RGO/TiO2 Composites

doi:10.15541/jim20160349

Abstract

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/TiO₂composites 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/TiO₂shows the best adsorption capacity for methyl orange. And 5wt% RGO/TiO₂shows 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:

TB34

LI Cui-Xia, JIN Hai-Ze, YANG Zhi-Zhong, YANG Xuan, DONG Qi-Zheng, LI Ting-Ting. Preparation and Photocatalytic Properties of Mesoporous RGO/TiO₂ Composites[J]. Journal of Inorganic Materials, 2017, 32(4): 357-364.

Figures/Tables 9

Fig. 1 XRD patterns of 5wt% RGO/TiO2 (a) 5wt% GO/TiO2 (b) and TiO2 (c)

Fig. 2 Mechanism of ultraviolet radiation reduction of GO

Fig. 3 TEM (a) and SAEDP(b) images of 5wt% RGO/TiO2

Fig. 4 N2 adsorption-desorption isotherms (a) and BJH pore size distribution plot (b) of 5wt%RGO/TiO2

Fig. 5 UV-visible diffuse reflectance spectra of TiO2 and 5wt%RGO/TiO2

Fig. 6 Photoluminescence spectra of RGO/TiO2 composites with different contents of RGO

Fig. 7 Adsorption activity of RGO/TiO2 composites with different contents of RGO

Fig. 8 Degradation rate of photocatalyst under different light irradiation(a) Ultraviolet light; (b) Sunlight

Fig. 9 Recovery test of 5wt% RGO/TiO2

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Preparation and Photocatalytic Properties of Mesoporous RGO/TiO₂ Composites

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