▎ 摘　　要

NOVELTY - Preparing graphene/cellulose aerogel-based composite photocatalyst, comprises (i) adding cellulose into a sodium hydroxide/urea mixed solution under stirring, mixing, and centrifuging to remove impurities to obtain cellulose solution (ii) adding semiconductor photocatalyst and graphene oxide solution to the cellulose solution, ultrasonically stirring at room temperature, adding a cross-linking agent, and stirring evenly to obtain cellulose mixed solution (iii) transferring the cellulose mixture to the mold and allowing it to stand to obtain cellulose hydrogel, and (iv) washing cellulose hydrogel, pre-freezing and freeze-drying to obtain graphene/cellulose aerogel-based composite photocatalyst; the mass percentage of the semiconductor photocatalyst in the graphene/cellulose aerogel-based composite photocatalyst is 35-45%. USE - The graphene/cellulose aerogel-based composite photocatalyst is useful in the treatment of wastewater containing dyes (claimed). ADVANTAGE - The method solves the problem that the adsorption of pollutants by the existing cellulose aerogel will fail once it reaches a saturated state, pollutants cannot be removed continuously, semiconductor photocatalysts and graphene have low quantum efficiency, difficult to recycle, and have a low reuse rate. DETAILED DESCRIPTION - Preparing graphene/cellulose aerogel-based composite photocatalyst, comprises (i) adding cellulose into a sodium hydroxide/urea mixed solution under stirring at -10° to -12 ℃, mixing, and centrifuging to remove impurities to obtain cellulose solution; the mass percentage of sodium hydroxide in the sodium hydroxide/urea mixed solution is 5-10%, and the mass percentage of urea in the sodium hydroxide/urea mixed solution is 10-15%; the mass ratio of cellulose and sodium hydroxide/urea mixed solution is 0.02-0.03:1, (ii) adding semiconductor photocatalyst and graphene oxide solution to the cellulose solution, ultrasonically stirring at room temperature, adding a cross-linking agent, and stirring evenly to obtain cellulose mixed solution; the cross-linking agent is 20-30% of the mass of cellulose in the cellulose solution; the graphene oxide in the graphene oxide solution is 1-3% of the mass of the cellulose in the cellulose solution, (iii) transfering the cellulose mixture to the mold at room temperature and allowing it to stand for 2-3 days to obtain cellulose hydrogel, and (iv) washing cellulose hydrogel, pre-freezing for 10-15 hours at -20° to -35 ℃, and freeze-drying at -70° to -80 ℃ and vacuum degree of 5-20 Pa for 30-50 hours to obtain graphene/cellulose aerogel-based composite photocatalyst; the mass percentage of the semiconductor photocatalyst in the graphene/cellulose aerogel-based composite photocatalyst is 35-45%.