Abstract
Bi2WO6 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 Bi2WO6 synthesized with a series of temperature and pH values shows different morphologies and photocatalytic properties. The photocatalyst (Bi2WO6) 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 •O2− contribute negligible influence, while the addition of H2O2 significantly improves the photocatalytic activity of Bi2WO6. Biodegraded poplar preconditioning refiner chemical alkaline peroxide mechanical pulp wastewater (PPW) was treated over Bi2WO6 under UV light (Bi2WO6/UV/H2O2); chemical oxygen demand (CODCr) and color degradation rate were 85.8% and 92.0%, respectively. These results show that Bi2WO6 semiconductors can be introduced as an efficient and stable photocatalyst for industry wastewater treatment.
Highlights
In recent years, the pulp and paper industry has experienced rapid development, and its economic benefits have contributed to it becoming one of the most paramount industrial components in the world [1,2]
When Bi2WO6 is synthesized at the same temperature, pH = 7 shows better photocatalytic activities
The pH value and temperature play an important role on the synthetic progress of Bi2 WO6, resulting in differences in morphology, crystallinity, optical properties, and electronic properties
Summary
The pulp and paper industry has experienced rapid development, and its economic benefits have contributed to it becoming one of the most paramount industrial components in the world [1,2]. The as-obtained effluents derived from raw materials and production processes inevitably have a high chemical oxygen demand (COD) and low biodegradability properties, which usually consists of >200 organic compounds and total organic and inorganic species of approximately 700 [5,6]. Among those pollutants, dioxins, chlorate, chlorinated hydrocarbons, chloroform, phenols, and furans were observed, which are seriously harmful to human [7,8]. Processes, largecost, amounts of sludge,were highgenerated, cost, and corrosion generated, resulting in secondary developing an environmentally friendly cost-efficient technique to deal with industrial wastewater pollution.
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