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Abstract
Mesoporous Au-TiO2nanocomposite plasmonic photocatalyst with visible-light photoactivity was prepared by a simple spray hydrolytic method using photoreduction technique at90∘C. The prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2adsorption-desorption isotherms. The formation of hydroxyl radicals (•OH) on the surface of visible-light illuminated Au-TiO2nanocomposites was detected by the luminescence technique using terephthalic acid as probe molecules. The photocatalytic activity was evaluated by photocatalytic decolorization of Rhodamine-B (RhB) aqueous solution under visible-light irradiation (λ > 420 nm). The results revealed that the TiO2could be crystallizedviaspray hydrolysis method, and the photoreduction technique was facilitated to prepare Au nanoparticles in the mesoporous TiO2at90∘C. The light absorption, the formation rate of hydroxyl radicals, and photocatalytic decolorization of Rhodamine-B aqueous solution were significantly enhanced by those embedded Au nanoparticles in the Au-TiO2nanocomposites. The prepared Au-TiO2nanocomposites exhibit a highly visible-light photocatalytic activity for photocatalytic degradation of RhB in water, and their photocatalytic activity is higher than that of the pristine TiO2nanoparticles due to the surface plasmon resonance.
Highlights
Since the discovery of photocatalytic water splitting on TiO2 single-crystal electrodes by Fujishima and Honda in 1972 [1], nanosized TiO2 semiconductor has been always regarded as one of the most promising photocatalysts in practical applications, especially water cleaning and removal of volatile organic compounds (VOCs) in air, due to its high photocatalytic activity, chemical stability, low cost, and nontoxicity [2,3,4,5,6,7,8,9,10,11,12]
The photocatalytic activity was evaluated by photocatalytic decolorization of Rhodamine-B (RhB) aqueous solution under visible-light irradiation (λ > 420 nm)
The results revealed that the TiO2 could be crystallized via spray hydrolysis method, and the photoreduction technique was facilitated to prepare Au nanoparticles in the mesoporous TiO2 at 90◦C
Summary
Since the discovery of photocatalytic water splitting on TiO2 single-crystal electrodes by Fujishima and Honda in 1972 [1], nanosized TiO2 semiconductor has been always regarded as one of the most promising photocatalysts in practical applications, especially water cleaning and removal of volatile organic compounds (VOCs) in air, due to its high photocatalytic activity, chemical stability, low cost, and nontoxicity [2,3,4,5,6,7,8,9,10,11,12]. The other is that the conduction band of anatase can transfer the photogenerated electrons of the excited Au to adsorbed O2 and to form active superoxide radical anions [23,24,25] Several techniques, such as sol-gel method, chemical vapor deposition, laser vaporization, modified impregnation, precipitation-reduction, and photoreduction, have been developed to design and modulate the Au-TiO2 composite nanoparticles. The TiO2 aggregates obtained by this method are amorphous in nature and calcination temperatures higher than 400◦C are required to realize the phase transformation from amorphous to anatase Such high calcination temperatures will lead to the increase of crystallite size and the decrease of specific surface areas and pore volume, and induce the heat-aggregation of Au nanoparticles. The photocatalytic activity of the Au-TiO2 composite samples was evaluated by photocatalytic decolorization of RhB aqueous solution under visible-light irradiation (λ > 420 nm)
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