Study on preparation and toluene removal of BiOI/Bi2WO6/ACF photocatalyst

The BiOI/Bi₂WO₆/ACF composite photocatalysts with different loads were prepared by hydrothermal method, and the catalysts were characterized by XRD, SEM, TEM, BET, XPS, DRS and photocurrent responses. The photocatalytic activity of the samples was studied with the toluene as model pollutant. The results showed that 20%mol BiOI/Bi₂WO₆ was uniformly loaded on the activated carbon fiber (ACF), and Bi₂WO₆ (133) orthorhombic crystal face and BiOI (012) tetragonal crystal face can be observed on the catalyst surface. The specific surface area of 20% mol BiOI/Bi₂WO₆/ACF is 787 m²·g⁻¹, which is much higher than that of Bi₂WO₆/ACF. BiOI and Bi₂WO₆ exist simultaneously in the BiOI/Bi₂WO₆ according to the results of XPS, which corresponds to the results of TEM characterization, indicating that the composites were successfully prepared, and the absorption band edge and intensity of Bi₂WO₆ was enhanced greatly by the compositing of BiOI. The toluene removal efficiency could arrive at 76.3% for the concentration of 500 mg/m³ with the 20%mol BiOI/Bi₂WO₆/ACF.