Abstract
To overcome the shortcomings of separation and recovery difficulties of powdered catalysts in practical applications, a novel flexible catalyst film (2D-WO3/CA) was formed by combining 2D-WO3 with cellulose acetate (CA), and successfully applied in degrading organic pollutants in water under real solar irradiation. The structure, morphology and optical properties of the new photocatalytic film were characterized by using X-ray diffraction, scanning electron microscope and UV–vis diffuse reflectance spectra technology, respectively. The results showed that the absorption edges of 2D-WO3/CA film shifted remarkably to the longer wavelength compared with 2D-WO3, indicating that 2D-WO3/CA film could broaden the spectral response range. Furthermore, the photocatalytic capacity of the film was explored by degrading methylene blue (MB) in aquatic solution under real sunlight in the continuous baffled photo-reactor (CBPR). The film exhibited excellent degrading properties with an average removal rate of 85% for MB, and the processing load corresponded to 478.13 mg/(m2·d). The film still had high activity and flexibility after treating wastewater for seven consecutive days. Therefore, the new 2D-WO3/CA film is promising in actual dye wastewater treatment. Based on the above analysis, MB degradation mechanism in the photocatalytic system with 2D-WO3/CA film was proposed finally.
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