Preparation, characterization and photo-catalytic behavior of WO3-TiO2 catalysts with oxygen vacancies

摘要

TiO2 photocatalysts compounded with WO3 were prepared via a modified hydrolysis process and the 2% WO3-TiO2 catalysts with different oxygen vacancies were obtained by calcination at 873 K in H2 atmosphere.The catalysts were identified using X-ray diffractometry (XRD),specific surface measurement (BET),electron paramagnetic resonance spectroscopy (EPR),UV-Vis diffusion refraction spectroscopy (DRS),and X-ray photoelectron spectroscopy (XPS).The photocatalytic activity of 2% WO3-TiO2 with different oxygen vacancies was investigated employing splitting of water for O2 evolution.The results indicate that appropriate oxygen vacancies can obviously improve the photocatalytic activity of 2% WO3-TiO2 catalysts,and using Fe3+ as an electron acceptor under UV irradiation in 12 h,the maximum rate for O2 evolution is 667 μmol/(L·h).