Synthesis and Photocatalytic Properties of Bi2WO6/UiO-66 Composite

A composite photocatalyst Bi2WO6/UiO-66 was prepared by hydrothermal method. The effect of template glacial acetic acid (CH3COOH) on the morphology of UiO-66 and the effects of different molar ratios of Bi and Zr on the photocatalytic performance of the composite were investigated. XRD, SEM, N-2 adsorption desorption, UV-Vis DRS and XPS were used to characterize the phase, morphology, specific surface area, optical absorption performance and element composition of the catalyst. The experimental results show that when n(Bi):n(Zr)= 2:1, the photocatalytic activity of RhB by Bi2WO6/UiO-66 is the highest. The relative concentration of RhB decreased 98.5% after 50 minutes of visible light irradiation. After five recycling experiments, there was no significant decrease in photocatalytic activity, but the photocatalytic activity of pure Bi2WO6 decreased greatly, which indicated that the stability of the complex is higher than that of pure Bi2WO6. According to free radical trapping experiments, it is proved that holes (h(+)) play an important role in photocatalysis. The reasons for the improvement of photocatalytic activity were further explained by electrochemical test. The band gap and valence band position of the material were obtained by UV-Vis DRS and VB-XPS, and the possible photocatalysis mechanism was put forward.