A durable semiconductor photocatalyst
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Mesoporous graphitic carbon nitride robustly performs organic photoredox reactionsMethyl orange
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This study prepared TiO2 film photocatalyst based on Ti plate using sol-gel method. XRD result demonstrated that the prepared photocatalyst mainly consisted of anatase crystals about 35.7nm on the average. SEM characterization result showed that the surface of the photocatalyst was very even and compact. And TiO2connected with the Ti plate closely and firmly. The photoelectrochemistry characteristic of the photocatalyst tested with electrochemistry method indicated that the prepared photocatalyst was n-type semiconductor and the extra electric field would promote the separation of photogenerated electron and hole in favor of the increase of the photocatalysis efficiency. The degradation experiments of benzamide by photocatalysis and electrically assisted photocatalysis (EAP) demonstrated that the extra electric field had the obvious assistant effect on photocatalysis and the benzamide degradation rate by EAP was much higher than that by photocatalysis. When the electrode potential of photocatalyst was -0.05V/SCE,the removal efficiency of benzamide could be 95% in 120min.
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With the vigorous development of semiconductor materials, the third generation of semiconductors represented by SiC, GaN, and diamond have gradually become the mainstream materials of modern semiconductors, and this paper introduces the application of SiC, GaN, and diamond, respectively, and analyzes their existing properties. The advantages and disadvantages of each are drawn in more detail.
Wide-bandgap semiconductor
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Redistribution
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Visible spectrum
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The photocatalyst Ag3VO4 was prepared by the chemical precipitation method.The photocatalyst was characterized by X-ray powder diffraction(XRD),UV-Vis diffuse reflectance spectroscopy(UV-Vis) and Photoluminescence(PL) emission spectra.The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr2O2-7 and photocatalytic oxidation of Methyl Orange(MO).The effect of different preparation conditions on the photocatalytic activity of Ag3VO4 was investigated.The results showed that the Ag3VO4 photocatalyst prepared in the presence of excess silver exhibited the excellent photocatalytic reduction activity of Cr2O2-7 and photocatalytic oxidation activity of Methyl Orange(MO) under visible light irradiation.And the photoabsorption wavelength range of the photocatalyst red shifts and the utilization of the total spectrum improves.As for the Ag3VO4 photocatalyst(Ag/V=6:1),the stability and cycling runs are studied.The possible mechanisms of influence on the photocatalytic activity of the Ag3VO4 photocatalyst were also discussed.
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Fe3+ and Al 3+ co-doped TiO2(Fe3+/Al3+-TiO2)composite photocatalysts were prepared by the sol-gel method using Ti(OC4H9)4 as precursor and characterized by X-ray diffraction(XRD)and UV-Vis.The effect of calcination temperature and salts in photocatalytic system on the photocatalytic activity of Fe3+/Al3+-TiO2 were investigated by photocatalytic degradation of methyl orange irradiated by sunlight.The photocatalytic activity of Fe3+/Al3+-TiO2 was enhanced with increasing temperature.HCO3-and NO2-decreased its photocatalytic activity.
Methyl orange
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Underlayer exposed ZnO:Al-TiO2 coupled films are prepared by different means.Surface morphology by SEM,microstructure by XRD,film thickness by surface profiler and photocatalysis are investigated.In order to explain the enhanced photocatalysis,reaction Ag++→Ag↓ is adopted to clarify the mechanism.It turns out that during the process of photocatalysis the exposed part of the underlayer releases e-and this suppresses recombination of light-induced charges,thus enhanced photocatalysis.
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