Shapes Control of Bi2WO6 Nano-Structures as Photo-Fenton Catalysts for Pulping Wastewater Treatment

Bi 2WO 6 assembled by flower-like microspheres and nanosheets were controllably synthesized through a one-step hydrothermal approach. Multiple technologies, including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and UV–Vis diffuse reflectance spectrum (UV–Vis), were carried out to characterize the as-synthesized samples. The photocatalytic efficiency of Bi 2WO 6 synthesized with a series of temperature and pH values shows different morphologies and photocatalytic properties. The photocatalyst (Bi 2WO 6) synthesized at 220 °C and pH of 7 exhibited the best photocatalytic performance, with the methylene blue (MB) degradation approaching 91.6% after reaction time of 60 min. Free radical capture experiments indicate that ？OH is the primary reactive species in the methylene blue (MB) degradation reaction, h + and ？O 2 ？ contribute negligible influence, while the addition of H 2O 2 significantly improves the photocatalytic activity of Bi 2WO 6. Biodegraded poplar preconditioning refiner chemical alkaline peroxide mechanical pulp wastewater (PPW) was treated over Bi 2WO 6 under UV light (Bi 2WO 6/UV/H 2O 2); chemical oxygen demand (COD Cr) and color degradation rate were 85.8% and 92.0%, respectively. These results show that Bi 2WO 6 semiconductors can be introduced as an efficient and stable photocatalyst for industry wastewater treatment. View Full-Tex