Preparation and performance study of electrospun MOF membrane for photocatalytic CO2 reduction
Metal-organic frameworks(MOFs)have garnered considerable attention for their applications in heterogeneous catalysis.However,their practical utility is hindered by subpar separation efficiency from reaction mixtures.While MOF membranes find widespread application in photocatalytic decomposition of pollutants,their utilization in the photocatalytic CO2 reduction domain is notably underexplored.Consequently,the preparation of MOF membranes tailored for efficient photocatalytic CO2 reduction becomes imperative.In this study,ZIF-67 was blended into polyacrylonitrile(PAN)nanofiber membranes(NFMs)by electrospinning,and then heat stabilized to obtain SZIF-67/PAN NFMs.The morphology,chemical composition,photocatalytic properties and photoelectric properties were characterized.The results demonstrate that SZIF-67/PAN NFMs exhibit outstanding visible light-driven photocatalytic activity for CO2 reduction,attributed to improvements in visible light responsiveness,photothermal conversion capability,and solvent resistance.The CO generation rate reached 12 000 μmol/(g·h),with photocatalytic performance maintaining at 85.4％after three repeated uses.In addition,the possible mechanism of total CO2 photoreduction is proposed:the photosensitizers generate electrons through visible light excitation into the Co active site in SZIF-67/PAN NFMs,and the electrons adsorbing at the Co active site are further transferred to CO2 and form CO with protons.Finally,CO is desorbed from NFMs to achieve the photocatalytic conversion of CO2 to CO.
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