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Abstract
Anatase TiO2nanosheet porous films were prepared by calcination of the orthorhombic titanic acid films at 400°C. They showed an excellent photocatalytic activity for CO2photoreduction to methane, which should be related to their special porous structure and large Brunauer-Emmett-Teller (BET) surface area. In order to further improve the photocatalytic activity, Pt nanoparticles were loaded uniformly with the average size of 3-4 nm on TiO2porous films by the photoreduction method. It was found that the loading of Pt expanded the light absorption ability of the porous film and improved the transformation efficiency of CO2to methane. The conversion yield of CO2to methane on Pt/TiO2film reached 20.51 ppm/h·cm2. The Pt/TiO2nanosheet porous film was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS). Moreover, the transient photocurrent-time curves showed that the Pt/TiO2nanosheet porous film exhibited higher photocurrent, indicating that the higher separation efficiency of the photogenerated charge carriers was achieved.
Highlights
Fossil fuels are our primary source of energy
CO2 emissions generated in using these fuels have drastically increased in atmosphere in recent years, and the fast-growing CO2 leads to climate change, which has become one of the greatest threats of environmental problems
The phase structure of the titania films was analyzed by the X-ray diffraction (XRD) technique
Summary
Fossil fuels are our primary source of energy. CO2 emissions generated in using these fuels have drastically increased in atmosphere in recent years, and the fast-growing CO2 leads to climate change, which has become one of the greatest threats of environmental problems. The photocatalytic reduction of CO2 is a possible avenue to convert CO2 into hydrocarbon fuels, because reducing the amount of CO2 will meet the purpose of environmental protection and provide raw materials for chemical industry. This process utilizes ultraviolet (UV) and/or visible light as the excitation source for semiconductor catalysts, and the photoexcited electrons reduce CO2 with H2O on the catalyst surface and form energy-bearing products such as carbon monoxide (CO), methane (CH4), methanol (CH3OH), formaldehyde (HCHO), and formic acid (HCOOH) [1]. The relationship between the morphology, structure, and their photocatalytic activity was investigated in detail
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