Synthesis and photocatalytic activity of titanium oxinitride Ti(O, N) and Pd-Ti(O,N) nanoparticles
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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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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.
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