Synthesis of the Dy: SrMoO4 with High Photocatalytic Activity under Visible Light Irradiation: no

Dysprosium (Dy)-doping SrMoO4 (with different molar ratio of Dy/Sr=0/100, 10/100, 15/100 and 20/100) have been synthesized by high temperature thermal decomposition of metal-organic salt in organic solvent with a high boiling point. Their structures, morphology, and optical properties were characterized by X-ray diffraction (XRD), high-resolution tuning electron microscopy ((HR)TEM), X-ray photo-electron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). Using this method, the pure phase, nano-size, and low band gap of SrMoO4 sample are obtained. The results shows that the size of as-synthesized SrMoO4 nanoparticles was about 200nm. The band gap of Dy-doped SrMoO4 ranges from 3.76-3.90eV, and decreases with increasing Dy concentration. The photocatalytic performance of as-syntheszied products were determined from the degradation of methylene blue (MB) by UV-vis light irradiation. The 15mol%Dy-doped SrMoO4 sample shows the best performance for photocatalytic degradation of methyl blue of nearly 100% in 120min under visible irradiation, which is higher than most of those reported before. The present work is meaningful for revealing the underlying mechanism in photocatalyst and improving the photocatalytic performance.