alpha-Fe2O3 supported Bi2WO6 for photocatalytic degradation of gaseous benzene

摘要

The Bi2WO6/alpha-Fe2O3 composite photocatalyst was synthesized by using goethite as a precursor through hydrothermal-calcination method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis reflection spectrometer (DRS), X-ray photoelectron spectroscopy (XPS) and N-2 adsorption-desorption measurement (BET). These results indicated that the self-made composite photocatalysts had excellent catalytic performance of degradation of gaseous benzene. When benzene initial concentration at 50 mg/m(3), over the alpha-FeOOH/Bi2WO6 with molar mass of 0.8: 1, calcined at 350 degrees C for 2 h and the pH of precursor solution was 3, the benzene degradation rate reached 71.9% and the mineralization efficiency reached 67.7% after 220 min UV irradiation, respectively. The h(+) and O-center dot(2)- generated in the photocatalytic system should be played a pivotal role for the enhanced photodegradation performance of gaseous benzene. (C) 2017 Elsevier Masson SAS. All rights reserved.