Preparation and water-splitting photocatalytic behavior of S-doped WO3

► S-doped WO3 powders were prepared by solid-state annealing method using thiourea as S precursor. ► The absorbance increases with the sulfur concentration of S-doped WO3 samples. ► S-doped WO3 powders were used for photocatalytic water splitting. ► S-doped samples exhibited higher levels of photocatalytic activity under ultraviolet and visible light irradiation.