This paper reports the synthesis of monoclinic bismuth vanadate (BiVO 4 ) by the oxidant peroxide method with crystallization under hydrothermal conditions, and its catalytic performance on the photodegradation of pollutants under visible-light. The as-synthesized BiVO 4 materials were characterized by means of XRD, EDX, Raman spectroscopy, UV-Vis DRS and FEG-SEM. The hydrothermal treatment above 80 °C 10 was required to obtain pure monoclinic BiVO 4 phase by releasing V 5+ ions from vanadium peroxo complexes. With the increase in hydrothermal reaction temperature, the particle size decreased. All BiVO 4 samples presented large size and shape distribution and band gap of approximately 2.40 eV. The as-prepared BiVO 4 catalysts showed high photoactivity for decomposition of model pollutants, methylene blue and rhodamine B dyes, under exposure to visible-light. The photodegradation mechanism was 15 evaluated by adding scavengers, DMSO and KBrO 3 , which were used to probe • OH radical and conduction band (CB) electrons, respectively. It was observed that photodegradation of MB and RhB dyes is caused by the action of • OH radicals, and that BiVO 4 CB electrons do not have reduction potential sufficiently high to reduce dissolved oxygen to O 2 -• . It was proven that the indirect mechanism, i.e. • OH radical formation, plays the major role on the BiVO 4 -assisted photodegradation process. 20
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