Enhanced photo-reduction and removal of Cr(VI) on reduced graphene oxide decorated with TiO₂ nanoparticles

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• 作者：Ying Zhao ; Donglin Zhao ; Changlun Chen ; Xiangke Wang
• 关键词：Reduced graphene oxide ; TiO2 nanoparticles ; Photocatalytic performance ; Cr(VI) removal
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：405
• 期：Complete
• 页码：211-217
• 全文大小：1296 K

文摘

Reduced graphene oxide decorated with TiO₂ nanoparticles (TiO₂-RGO) was synthesized and characterized by scanning and transmission electron microscopy, powder X-ray diffraction, ultraviolet-visible spectroscopy, photoluminescence excitation and emission spectroscopy, and X-ray photoelectron spectroscopy. Photo-reduction and removal of Cr(VI) from an aqueous solution using the material were investigated under visible light irradiation. Compared to pure TiO₂, the TiO₂-RGO exhibited an improved photocatalytic performance in the reduction of Cr(VI) under visible light irradiation, with a maximum removal of 86.5 % vs 54.2 % due to the increased light absorption intensity and wavelength range as well as the reduction in electron-hole pair recombination in TiO₂ with the addition of RGO. The adsorption and photocatalytic reduction of Cr(VI) decreased with increasing pH, due to the decrease in the electrostatic attraction between anionic Cr(VI) and TiO₂-RGO and the decrease in the thermodynamic driving force of Cr(VI) reduction to Cr(III).