▎ 摘　　要

NOVELTY - Photo-thermal catalytic composite material comprises nitrogen-doped graphene as a carrier, and copper sulfide/nitrogen-titanium dioxide (CuS/N-TiO2) nanoparticles formed by coating copper sulfide and nitrogen-doped titanium dioxide as an active component. USE - The photo-thermal catalytic composite material is used as photo-thermal catalyst of carbon dioxide reduction reaction (all claimed). ADVANTAGE - The photo-thermal catalytic composite material solves problem of low efficiency of photo-thermal catalytic material in the prior art, realizes high-efficiency adsorption activation performance, and has good catalytic effect in the carbon dioxide catalytic reduction process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation method of photo-thermal catalytic composite material, comprising adding oxidation graphene in ethanol to obtain uniformly mixed graphene solution, respectively adding nitrogen source, copper source and sulfur source in a mass ratio of (50-300): (1-10): (1-10), preparing into mixed solution I, transferring the mixed solution I into the reaction kettle, reacting at 160℃ for 12 hours to obtain the mixed solution II, removing out the mixed solution II from the reaction kettle, naturally cooling to room temperature, using high speed centrifugal method to separate precipitate I from the mixed solution II, repeatedly washing precipitate I by advanced prepared de-ionized water and ethanol solution, recording the repeatedly washed precipitate as precipitate II, drying the precipitate II, mixing titanium tetrabutoxide (C16H36O4Ti) and aqueous ammonia, adding the precipitate II, uniformly stirring for 2 hours, adding into high pressure reaction kettle, placing under the condition of temperature of 160-200℃, reacting for 12-24 hours, finishing reaction, cooling to room temperature, removing out the mixture, performing centrifugal separation, repeatedly cleaning until the supernatant is neutral, drying the neutral supernatant sample to obtain photo-thermal catalytic composite material i.e. nitrogen-doped graphene loaded CuS/N-TiO2.