▎ 摘　　要

NOVELTY - Method for preparing zinc ferrite-graphene composite aerogel, involves (a) mixing and stirring iron source, zinc source, deionized water and absolute ethanol to obtain a clear zinc ferrite mixed solution, (b) adding graphene oxide aqueous solution to the mixed solution, mixing and stirring, and ultrasonically dispersing, (c) adding the sol in a hydrothermal reaction kettle, placing the reaction kettle in an oven and naturally cooling, (d) adding deionized water to the wet gel obtained in step (c) for solvent replacement, (e) carrying out pre-freezing treatment on the composite wet gel in step (d) in a refrigerator, (f) vacuum freeze-drying the composite cryogel frozen in step (e) and taking out the sample after the temperature and pressure of the freeze dryer return to room temperature and normal pressure, and (g) performing high-temperature heat treatment in the aerogel precursor obtained in step (f) in a protective atmosphere, and naturally cooling to obtain the product. USE - The method is useful for preparing zinc ferrite-graphene composite aerogel in photocatalytic carbon dioxide reduction application. ADVANTAGE - The composite aerogel has high specific surface area, catalytic active sites and sunlight utilization rate, and quickly transfers photo-generated electrons to improve catalytic efficiency. DETAILED DESCRIPTION - Method for preparing zinc ferrite-graphene composite aerogel, involves (a) mixing and stirring iron source, zinc source, deionized water and absolute ethanol in a molar ratio of 1:0.5:(40-60):(15-20) to obtain a clear zinc ferrite mixed solution, (b) adding graphene oxide aqueous solution to the mixed solution, mixing and stirring for 5-10 minutes, and ultrasonically dispersing for 30-60 minutes, (c) adding the sol in a hydrothermal reaction kettle, placing the reaction kettle in an oven at a hydrothermal temperature of 160-180 degrees C for 10-14 hours and naturally cooling, (d) adding deionized water to the wet gel obtained in step (c) for solvent replacement, (e) carrying out pre-freezing treatment on the composite wet gel in step (d) in a refrigerator, (f) vacuum freeze-drying the composite cryogel frozen in step (e) at -60 degrees C to -55 degrees C for 36-72 hours with a pressure of 1-5 Pa and taking out the sample after the temperature and pressure of the freeze dryer return to room temperature and normal pressure, and (g) performing high-temperature heat treatment in the aerogel precursor obtained in step (f) at 300-900 degrees C for 2-4 hours at a heating rate of 2-4 degrees C/minute in a protective atmosphere, and naturally cooling to obtain the product.