Fabrication of High Performance and Stability Bi2WO6 Based Photocatalytic Thin Film Doping with Polyethylene Glycol for Wastewater Treatment

摘要

Nowadays, Bi2WO6 photocatalyst has drawn worldwide attention due to its low cost, narrow bandgap, and visible-light- driven property. However, the high recombination rate of the generated electron-hole pairs restricted the photocatalytic efficiency of the Bi2WO6 photocatalyst [1]. To solve this problem, Ag, Ag2O, and Ag3PO4 has been doped with Bi2WO6 to fabricate a novel heterogeneous photocatalyst with high photocatalytic activity. In general, photocatalyst is usually used as suspend powders in wastewater treatment process. Nevertheless, the laborious collection of the used powders imposes restrictions on the practical application of the photocatalyst. Therefore, it is an inevitable choice to synthesize photocatalytic film with high photocatalytic efficiency and stability for further commercialization. Polyethylene glycol (PEG), as a common stabilizer and structure directing agent, has been a promising alternative in modifying of photocatalytic thin film [2]. Besides, there are few reports about modification of Bi2WO6 photocatalyst with PEG. Hence, in this study PEG was utilized to fabricate Bi2WO6 based photocatalytic thin film with high performance and stability.