【摘要】 采用水热法制备TiO₂纳米粒子,通过光化学还原沉积法制备了Au/TiO₂光催化剂,并利用SEM、XRD、EDS和DRS等技术对样品进行了表征,考察了不同Au含量对TiO₂纳米粒子光催化分解水制氢活性的影响。研究结果表明,通过此方法可以成功地将Au纳米粒子均匀地分散在TiO₂纳米粒子表面,用适量Au进行表面修饰不仅能提高TiO₂对可见光的吸收,还可以促进TiO₂光生电子-空穴对的分离效率,从而提高了TiO₂纳米粒子的光催化活性。其中,3%Au/TiO₂纳米粒子的光催化活性最高。更多还原

【Abstract】 Au/TiO₂ photocatalysts were prepared by photocatalytic reduction reactions to deposit Au on the surface of TiO₂ nanoparticles prepared by hydrothermal method. The samples were characterized by SEM, EDS,XRD and DRS techniques. The effect of the amount of Au on the photocatalytic activity of TiO₂ nanoparticles for hydrogen evolution from water splitting was investigated. The results show that Au nanoparticles were uniformly dispersed on the surface of TiO₂ nanoparticles. The surface modification with appropriate amount of Au not only can extend the absorption spectrum of TiO₂ nanoparticles, but also can enhance the separation efficiency of TiO₂ photoinduced electron-hole pairs, thereby the photocatalytic activity of TiO₂ nanoparticles can be improved. Among all the samples, 3% Au/TiO₂ nanoparticles show the highest photocatalytic activity.更多还原