▎ 摘　　要

NOVELTY - Preparing graphene oxide titanium dioxide composite nanofluid comprises e.g. (i) adding potassium permanganate at low temperature into a mixture of graphite powder, sodium nitrate and concentrated sulfuric acid, stirring for 0.5-1.5 hours, stirring the reaction solution at medium temperature for 1-3 hours, adding deionized water, stirring reaction solution at high temperature for 10-30 minutes, and adding deionized water and hydrogen peroxide, pickling and ultrasonic washing, and drying to obtain sheet of graphene oxide, (ii) using three-electrode constant voltage electrochemical system, attaching graphene oxide into the surface-pretreated copper block, where the copper block is the working electrode, the platinum electrode is the counter electrode, the reaction solution is titanium(III) chloride , and reacting at room temperature to obtain titanium dioxide seed layer on the surface of graphene oxide, (iii) growing titanium dioxide nanorods by chemical bath deposition. USE - The method is useful for preparing graphene oxide titanium dioxide composite nanofluid. ADVANTAGE - The method: increases the surface contact area of the single particles; has excellent properties of graphene oxide and titanium dioxide. DETAILED DESCRIPTION - Preparing graphene oxide titanium dioxide composite nanofluid comprises (i) adding potassium permanganate at low temperature into a mixture of graphite powder, sodium nitrate and concentrated sulfuric acid, stirring for 0.5-1.5 hours, stirring the reaction solution at medium temperature for 1-3 hours, adding deionized water, stirring reaction solution at high temperature for 10-30 minutes, and adding deionized water and hydrogen peroxide, pickling and ultrasonic washing, and drying to obtain sheet of graphene oxide, (ii) using three-electrode constant voltage electrochemical system, attaching graphene oxide into the surface-pretreated copper block, where the copper block is the working electrode, the platinum electrode is the counter electrode, the reaction solution is titanium(III) chloride , and reacting at room temperature to obtain titanium dioxide seed layer on the surface of graphene oxide, (iii) growing titanium dioxide nanorods by chemical bath deposition, and placing the copper block in the reaction solution of the titanium(III) chloride solution, reacting in a reaction bottle in the water bath for specific time to obtain titanium dioxide nanorod structure on the graphene oxide surface, taking out, rinsing with water to obtain graphene oxide-nanorod composite nanoparticles, adding the obtained composite nanoparticles into the deionized water, and utrasonically vibrating composite nanofluid.