Preparation of porous TiO2/V2O5 composite film by plasma electrolytic oxidation and its enhanced photocatalytic H2 production
The inferior photocatalytic hydrogen production greatly hinders its industrial application of TiO2.Herein,porous TiO2/V2O5 composite film photocatalysts were prepared by plasma electrolytic oxidation(PEO)method in phosphate solution mixed with NH4VO3.The composition,structure and light absorption properties of as-synthesized photocatalysts were characterized by SEM,EDS,XRD,XPS and UV-Vis DRS spectra.The photocatalytic hydrogen production performance of the film photocatalysts was evaluated by gas chromatography.The effects of NH4VO3 content in the electrolyte on structure,composition and the properties of the films were investigated.The results showed that the composite film catalyst is mainly composed of anatase and rutile TiO2,with the micro-sized porous structure.V2O5 mainly exists in the form of amorphous state in the film,which has a strong interaction with TiO2,afftecting the interplanar spacing of TiO2.The study found that the elemental V inhibits the crystallization of TiO2 and the formation of rutile TiO2 as well as expands the optical absorption range of the film.The photocatalytic activity of the film catalysts for splitting Na2S+Na2SO3 solution into H2 illustrates TiO2/V2O5 films prepared with a mass concentration of 1 g/L NH4VO3 presents the highest photocatalytic activity,surpassing other photocatalysts reported recently.The repeating photocatalytic tests showed high stability and constant photocatalytic activity of such composite film catalysts.
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