The introduction of thermal energy into traditional photocatalytic CO2 reaction is a new method to improve the conversion efficiency.A Bi@C/NCN composite catalyst was prepared by loading Bi@C nanoparticles onto three-dimensional honeycomb carbon nitride (NCN) by ultrasonic-assisted method.The composite was then loaded onto the surface of carbonized natural pine to assemble a gas-liquid-solid three-phase system for CO2 photothermal reduction.Under full spectrum irradiation,the CO2 reduction to CO activity of the composite catalyst with a 60% mass ratio of Bi@C to NCN reached 41.50μmol/(g·h),which was 2.65 times that of pure NCN.Among them,Bi@C nanoparticles could absorb near-infrared light and produce hot electrons,thereby raising the local temperature of the catalyst.In addition,thanks to the design of the three-phase system,most of the heat generated by the photothermal effect was confined to the catalyst surface,which increased the reaction temperature and reduced energy loss,providing a kinetic advantage for CO2 reduction.
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基金资助
国家自然科学基金(22278042);江苏省自然科学基金(BK20220625);江苏省常州市科技局应用基础研究项目(CQ20220088)
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