The highly stable construction of Pt/FeVO4 heterostructure with improving photocatalytic performance and growth mechanism for •O2 and •OH production based on Electron Spin Resonance study

Abstract We prepared a unique platinum doped iron vanadate (Pt/FeVO 4 ) composite for escalating the photocatalytic performance via the facile hydrothermal method using iron nitrate (Fe(NO 3 ) 3 .9H 2 O), Ammonia metavanadate (NH 4 VO 3 ) and chloroplatinic acid (H 2 PtCl 6 ), as major precursors. Characterization results revealed that the FeVO 4 and well dispersed platinum Pt/FeVO 4 are in the range of around 150 nm to 200 nm size, which developed transportations of the photo-generated electron into FeVO 4 , consequently efficient separation of the photo-generated carrier in coupled Pt/FeVO 4 nanocomposites heterostructure. The multi characterizations result indicated that excellent adsorption abilities of Pt/FeVO 4 composites were strongly associated with Pt doping. The induce impedance spectroscopy and Photoluminance results demonstrated that Pt enhances separations efficiency as well as transferring rates for photo-generated charge. The EPR data suggest that reactive oxygen species (OH • , h + , • O 2 ) were the most important factors in methylene blue (MB) degradation. As a result, Pt/FeVO 4 exhibits the greater photocatalytic ability to degradations for MB dye for visible light irradiation compared to pure FeVO 4 .