Study On The Photocatalyst Based On COF Composite Modification And Its Carbon Dioxide Reduction Performance

Environmental problems caused by greenhouse gas emissions have received more and more attention in recent years.Our country has proposed a goal of achieving carbon neutrality by 2060this year.In order to achieve this goal,in addition to adjusting the energy structure to control emissions,emerging carbon dioxide reduction technology will also play an important role.Collecting and transforming the emitted carbon dioxide can convert carbon dioxide into useful industrial raw materials such as methanol,methane,and carbon monoxide.The photocatalytic reduction of carbon dioxide technology can use solar energy and has the advantages of mild reaction conditions and environmental friendliness,which is an ideal carbon dioxide reduction technology.COFs material is an emerging all-organic framework material.It has the advantages of good chemical stability;large specific surface area;and designable structure.It has a good photocatalytic application prospect.It can be used for photocatalytic hydrogen production,degradation of pollutants,and photocatalytic reduction of carbon dioxide,etc.However,due to its own harsh synthesis conditions and low final yield,its large-scale application is restricted.In order to solve this problem,this study uses TP-TTA COF,then which is combined with traditional photocatalysts to reduce the dosage of COFs.This paper is based on TP-TTA COF,compounded with traditional photocatalyst TiO₂ and g-C₃N₄,and loading metal on the surface of COF,to explored the influence of COF on the carbon dioxide reduction ability of photocatalyst.It show the impact that composite COF make to the energy band of traditional photocatalytic semiconductor.Through the composite COF to realize the optimization of the photocatalytic semiconductor energy band structure,and improve the carbon dioxide reduction efficiency of（101）TiO₂ by 14.4 times;g-C₃N₄ and COF compounded to form a heterojunction,which improves the carbon dioxide reduction efficiency driven by visible light by more than 3 times;COF is loaded with metal cobalt and then recombined with g-C₃N₄ to realize the reduction of carbon dioxide without co-catalyst.The introduction of metal cobalt provides more active sites for the catalyst and reduces the active barrier of the reaction.The carbon dioxide reduction performance of g-C₃N₄ is improved by more than 10 times.The research in this article provides new routes and ideas for further expanding the application of COF in the field of photocatalysis,and also provides new progress for deepening the application of carbon dioxide reduction of g-C₃N₄/TiO₂.