▎ 摘　　要

NOVELTY - The method for the preparation of three-dimensional graphene-titanium dioxide composite photocatalyst using hydrothermal reaction involves adding concentrated sulfuric acid to a mixture of graphite powder and sodium nitrate, reacting, adding potassium permanganate powder, heating the reaction system, adding deionized water, adding hydrogen peroxide solution, reacting, filtering the reaction product, vacuum drying, dispersing graphene oxide in deionized water, adding titanium trichloride, reacting to obtain hydrogel products, and freeze-drying to obtain the photocatalyst. USE - Method is useful for the preparation of three-dimensional graphene-titanium dioxide composite photocatalyst (claimed), which is useful for degrading pesticides and other organic pollutants such as carbon dioxide and other non polluting substances in wastewater, and as super capacitors, lithium ion battery and a fuel cell material. ADVANTAGE - The three-dimensional graphene-titanium dioxide composite photocatalyst has excellent photocatalytic properties. DETAILED DESCRIPTION - The method for the preparation of three-dimensional graphene-titanium dioxide composite photocatalyst using hydrothermal reaction involves adding 18-20 ml of 98% concentrated sulfuric acid to a mixture of 300-500 mg graphite powder and 1.8-2 g sodium nitrate, reacting at less than 5 degrees C for 1-1.5 hours under stirring condition, adding 2-3 g potassium permanganate powder within 0.5 hour, reacting at a temperature of less than 5 degrees C for 1.5-2 hours, heating the reaction system at 35-40 degrees C, heat-preserving for 1-1.5 hours, adding 40-50 ml deionized water, heating at 90-100 degrees C for 10-15 minutes, cooling the reaction product to room temperature, adding 70-100 ml deionized water, adding 10-15 ml of 35% hydrogen peroxide solution, reacting, filtering the reaction product, washing the resulting filter cake 3 times with 300-400 ml of 5% hydrochloric acid, again washing 3 times with deionized water, carrying out dialysis treatment of the filter cake for 2 days, vacuum drying at 60 degrees C for 24 hours, crushing to obtain graphene oxide, dispersing 40-80 mg graphene oxide in 20-40 ml deionized water, ultrasonically treating for 1-2 hours, adding 30-60 mg titanium trichloride, uniformly stirring, adding 100-1000 mu l of 28 %mass aqueous ammonia to the reaction mixture, ultrasonically processing the mixture, putting the mixture into PTFE-lined autoclave, reacting at a temperature of 160-200 degrees C for 10-12 hours to obtain hydrogel products, and freeze-drying to obtain the three-dimensional graphene-titanium dioxide composite photocatalyst.