Abstract
A highly efficient and visible light (k C 420 nm) responsive nano- composite photocatalyst Co3O4/WO3 was developed by dispersing p-type semi- conductor Co3O4 on the surface of n-type semiconductor WO3. The heterojunction Co3O4/WO3 demonstrated higher photocatalytic activity than WO3 ,C o 3O4 and TiO2 nanoparticles for the complete decomposition of 2-propanol in gas phase and phenol in aqueous phase and evolution of CO2 under visible light irradiation. The highest photocatalytic efficiency of the composite Co3O4/WO3 was observed when calcined at 300 C for 2 h with 4.91 mol% Co3O4/WO3. The enhanced photocat- alytic efficiency of the heterojunction was discussed based on the unique relative energy band positions and profound absorption of visible light by the semiconductors.
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