| In this study, modified TiO2is prepared, characterized and tested on hydrogen evolution, and all work can be divided into two following parts.Firstly, TiO2photocatalysts with nickel sulfide cocatalyst are prepared by loading nickel sulfide on TiO2with solvothermal synthesis approach. The materials were prepared by glycol solvothemal method using anatase, nickel nitrate, thiourea as precursor. The prepared catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), and X-ray photoelectron spectroscopy (XPS). This is the first time to report that NiS is used as a cocatalyst with TiO2for the photocatalytic production of H2. The results revealed that the structure and the amount of the cocatalyst loaded on TiO2play important roles in the photocatalytic activity of NiS/TiO2composite. The maximum evolution of H2was obtained when NiS had hexagonal structure with content in the composite of7at%in relation to TiO2. The rate of H2evolution was increased by up to about30times than that of TiO2alone.Secondly, ternary P25/GO/Pt hybrid photocatalysts are prepared by different methods, using P25, graphene oxide (GO), chloroplatinic acid as precursor. The prepared catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). This work is first time to compare the hydrogen production of the ternary P25/GO/Pt hybrid photocatalysts prepared by different methods, and point out that the quantity of introduced GO and the preparation methods play an important role in photocatalytic activity on ternary P25/GO/Pt hybrid catalysts. When the proper Pt particle load on the flat surface of GO and the mass ratio of GO/TiO2is0.5wt%, the highest H2evolution is obtained. |
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