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Abstract
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).