Sb2WO6/BiOBr 2D nanocomposite S-scheme photocatalyst for NO removal

Abstract Photocatalysis technology is an efficient method for removing nitrogen oxides at low concentrations. Herein, dimension-matched Sb2WO6/BiOBr photocatalysts were synthesized at room temperature via precipitation-deposition way. Under visible light irradiation, the as-obtained Sb2WO6/BiOBr photocatalysts showed enhanced photocatalytic performance compare with the pure Sb2WO6 and BiOBr for removal of NO. The optimal ratio for photocatalytic performance of Sb2WO6/BiOBr composite was found to be 30 wt.% of Sb2WO6, which showed excellent recycling property even after 5 runs. Moreover, in situ DRIFT was carried out to reveal the time-dependent evolution of reaction intermediates during photocatalytic NO oxidation. The probable photocatalytic mechanism was considered based on the active species capture experiments. The enhanced photocatalytic performance for the Sb2WO6/BiOBr composite photocatalyst perhaps is attributed to the interaction between BiOBr and Sb2WO6 and S-scheme charge transfer path.