等离子体电解氧化法制备多孔TiO₂/V₂O₅复合物膜层及其增强光催化产氢活性

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 NH4V03. 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 NH4V03 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 l g/L NH4V03 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.