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分别采用化学镀铜法、化学还原法、浸渍法制备了3种Cu负载的S-TiO2光催化剂,综合利用UV-Vis、XRD、XPS、EXAFS、SEM和FESEM技术对制备的Cu/S-TiO2光催化材料的结构和光电子性能进行了表征.结果表明,化学镀铜法和浸渍法负载的铜物种为Cu2O和CuO,化学还原法制备的铜为Cu和Cu2O.化学镀铜法制备的Cu/S-TiO2光催化剂不仅对可见光具有很强的吸收能力,而且负载的铜物种连续、均匀地分散在S-TiO2表面,这种结构有利于光生电子的捕获、转移和分离.因此,化学镀铜法制备的Cu/S-TiO2在不同可见光波段(λ>420 nm,λ>500 nm)条件下光催化重整甲醇水溶液制氢反应中都表现出最高的催化活性,同时在模拟太阳光条件下以及稳定性实验的测试中也表现出优秀的性质,因此对其催化作用/反应机理进行了探讨.
Three Cu-supported S-TiO2 photocatalysts were prepared by electroless copper plating method, chemical reduction method and impregnation method. The prepared Cu / S-TiO2 photocatalysts were characterized by UV-Vis, XRD, XPS, EXAFS, SEM and FESEM The structure and photoelectron properties of the photocatalytic materials were characterized.The results show that the copper species supported by the electroless copper plating method and the impregnation method are Cu2O and CuO and the copper prepared by the chemical reduction method is Cu and Cu2O.The Cu / S-TiO2 photocatalyst not only has strong absorptivity to visible light, but also supported copper species are continuously and uniformly dispersed on the surface of S-TiO2, which is conducive to the capture, transfer and separation of photogenerated electrons. Therefore, electroless copper The Cu / S-TiO2 prepared by the method exhibited the highest photocatalytic activity in the hydrogen production of the photocatalytic reforming of methanol aqueous solution under the different visible light wavelength (λ> 420 nm, λ> 500 nm). Simultaneously, under simulated sunlight conditions As well as the stability of the test also showed excellent performance test, so its catalytic reaction / reaction mechanism were discussed.