Synthesis Of Semiconductor Catalysts Supported By Cobalt Compounds And Photocatalytic Reduction Of Carbon Dioxide

With the development of industrialization,the demand for non-renewable energy such as coal,oil and natural gas is increasing day by day.In the process of over-use of fossil fuels,energy shortage,global warming and environmental pollution will arise.Therefore,using clean energy to reduce carbon dioxide emissions has become particularly important.Solar energy has attracted people's attention because of its wide distribution and renewable advantages.In addition,photocatalytic carbon dioxide reduction can be used as an effective way to reduce carbon dioxide content in the air,which has aroused people's interest.In this paper,starting from the development of new non-noble metal catalysts,nano-materials such as boride,cobalt phosphide and cobalt nitride supported on carbon tri nitride were prepared,and photocatalytic reduction of carbon dioxide was studied.1.Co₃B-CoB nanomaterials were synthesized using cobalt nitrate as cobalt source and ammonia borane as boron source.The materials were characterized by XRD,TEM,XPS and ICP.The prepared nanomaterials were used in photocatalytic carbon dioxide reduction system.The results were optimized from four aspects:the selected solvent,the mass of catalyst added,the volume of sacrificial agent and the volume of water added.Under the optimum catalytic conditions,the rate of CO formation was as high as 28562 umol·h^-1·g^-11 and the selectivity of CO was as high as79%within three hours.2.Using cobalt nitrate as cobalt source and melamine as raw material,CoP@P-C₃N₄ nano-materials were prepared,and XRD was used.TEM,XPS and ICP were used to characterize the materials,and then the prepared nanomaterials were applied to the photocatalytic carbon dioxide reduction system.They were optimized from four aspects:the selected solvent,the quality of the catalyst,the volume of sacrificial agent and the volume of water added.Finally,under the optimal catalytic conditions,the rate of CO formation was as high as 28795 umol·h^-1·g^-11 and the selectivity of CO was as high as 78.5%within three hours.3.Using cobalt nitrate as cobalt source and melamine as raw material,CoN@P-C₃N₄ nanomaterials were prepared,and XRD,TEM,XPS and ICP were used to characterize the materials,and then the prepared nanomaterials were applied to the photocatalytic carbon dioxide reduction system.They were optimized from four aspects:the selected solvent,the quality of the catalyst,the volume of sacrificial agent and the volume of water added.Finally,under the optimal catalytic conditions,the rate of CO was as high as 28698 umol·h^-1·g^-1and the selectivity of CO was as78%within three hours.