Preparation and photocatalytic performance of Co3O4/SnO2 derived from a metal-organic framework
A cubic Co3O4/SnO2 composite photocatalyst was prepared by combining do-decahedral nano-blocks derived from metal-organic framework(MOF)material ZIF-67 with SnO2 at room temperature.Results showed that the band gap of the calcined Co3O4/SnO2 material was significantly reduced,and the phenomenon of fluorescence quenching was ob-vious.The addition of Co3O4 expanded the photoresponse range of SnO2 to visible light or even infrared light and simultaneously promoted the separation of photo-generated car-riers during the photocatalytic reaction.With Rhodamine B(RhB)used as the target reactant,the photocatalytic degradation activity of Co3O4/SnO2 derived from the MOF was investigated under visible light.It was found that Co3O4/SnO2 could degrade 89.6％RhB within 60 min,which was 4.5 and 3 times greater than those of pure SnO2 and pure ZIF-67,respectively.In addition,Co3O4/SnO2 showed good photoreactivity and stability.Based on these experimental results and those from free-radical quenching experiments,the mechanism of photocatalytic degradation of organic dyes RhB by the MOF-derived Co3O4/SnO2 composite material was proposed.
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