▎ 摘　　要

NOVELTY - Method for preparing zinc-copper oxide /titanium dioxide photocatalytic composite materials with core-shell structure comprises providing zinc source, copper source, 2-methylimidazole to prepare ZIF precursors, performing titanium source pretreatment by mixing formaldehyde and methylamine, mixing with toluene, mixing, heating for 2-3 hours to obtain transitional solution A, mixing 4-carboxybenzaldehyde and graphene to obtain transition solution B, mixing transition solution A and transition solution B, performing ultrasonic dispersion of the titanium dioxide/graphene composite powder in an organic solvent to obtain a dispersion solution B, mixing the dispersion solution B with the titanium dioxide/graphene composite powder, and mixing an active solution, and stirring to obtain the substrate solution, ultrasonic dispersing the ZIF precursor into the substrate solution, heating, and centrifuging to obtain zinc-copper oxide /titanium dioxide composite material. USE - Method for preparing zinc-copper oxide /titanium dioxide photocatalytic composite materials with core-shell structure, which is useful in photo-catalysis field. ADVANTAGE - The zinc-copper oxide/titanium dioxide photocatalytic composite materials: has good photo-catalytic activity; has large specific surface area, good dispersibility, uniform sample shape, and no agglomeration phenomenon. The method: is simple and controllable, and saves energy consumption. DETAILED DESCRIPTION - Method for preparing zinc-copper oxide /titanium dioxide photocatalytic composite materials with core-shell structure comprises (1) using zinc source, copper source, and 2-methylimidazole to prepare ZIF precursors, (2) (a) performing titanium source pretreatment by mixing formaldehyde and methylamine at the molar ratio of 1-2:1, mixing them with toluene at a mass ratio of 1:10- 15, mixing, heating at 150-250°C for 2-3 hours to obtain transitional solution A, mixing 4-carboxybenzaldehyde and graphene in a ratio of 10-15:1 by mass to obtain transition solution B, mixing transition solution A and transition solution B in a volume ratio of 10:1-3, heating for 4-8 hours to obtain transitional solution C, removing the toluene in transitional solution C by rotary evaporation, drying at normal temperature and pressure for 8-12 hours to obtain a graphene substrate, mixing, mechanical dispersion for 30-60 minutes, obtaining titanium dioxide/graphene composite powder, (b) performing ultrasonic dispersion of the titanium dioxide/graphene composite powder in an organic solvent with a mass ratio of 5-8:1 to the titanium dioxide/graphene composite powder to obtain a dispersion solution B, mixing the dispersion solution B with the titanium dioxide/graphene composite powder, and mixing an active solution to the volume ratio of 5:1-2, and stirring for 10-20 minutes to obtain the substrate solution, (c) ultrasonic dispersing the ZIF precursor into the substrate solution, heating at 150-200°C for 4-8 hours, and centrifuging at 4000-5000 revolutions per minute to obtain zinc-copper oxide /titanium dioxide composite material.