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Abstract
A low-cost, time-saving coupling method was developed to prepare a novel BiVO4/TiO2 heterostructure photocatalyst. Benzene was selected as a target pollutant to evaluate the enhanced heterogenous photocatalytic oxidation process of this photocatalyst. The results clearly indicated that the addition of BiVO4 accelerated the degradation of benzene, and the optimum composition was recognized as BiVO4: TiO2 with ratio of 1:200 (mass ratio). Compared with TiO2−xNx (nitrogen-doped TiO2), its efficiency of removing gaseous benzene and producing CO2 under visible light irradiation (λ>450nm) was demonstrated more than 3 and 4 times, respectively. Such high conversion and mineralization ratio could be maintained for more than 50h. Applications were also given for the photocatalytic elimination of gaseous benzene under simulated solar light and UV light irradiation. The benzene conversion reached 92% and 11%, corresponding to extremely high mineralization ratios of about 80% and 84%, respectively. Hence, this improved wide spectrum responsive photocatalyst would be needed, which were of importance to the potential application in the photocatalytic field.
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