SYNTHESIS OF Cr-DOPED SrMoO4 WITH ENHANCED PHOTOCATALYTIC PERFORMANCE VIA HYDROTHERMAL METHOD

Abstract

Cr-doped SrMoO4 visible-light-driven photocatalysts were successfully synthesized by one-pot facile hydrothermal technique. The results show that Cr doping slightly affected the crystal structure of SrMoO4. However, Cr doping plays an important role in sample morphology. Photocatalytic properties were evaluated by the degradation of methyl blue under visible-light irradiation. Electron spin resonance measurements show that the •O2  radical is the major active species in photodegradation. Photocatalytic measurement results indicate that Cr3+ doping effectively increases the photocatalytic activity of SrMoO4. When the Cr doping is 7%, the doped SrMoO4 exhibits the best photocatalytic performance. The increase in photocatalytic activity can be attributed to the following two factors: One is the decrease in sample band gap, and the other is the lower recombination ratio of photoinduced electron–hole pairs with Cr doping. The current experimental results clearly indicate that Cr doping is a useful method to improve the photocatalytic properties of SrMoO4 material.