▎ 摘　　要

NOVELTY - Preparing graphene comprises reducing dispersive graphite oxide in an inert solvent using a reducing agent to form a graphene-containing reaction mixture, and isolating graphene from the reaction mixture, where the reducing agent comprises sodium borohydride or vitamin C. USE - The method is useful for preparing graphene that is useful for preparing titanium dioxide-graphene nano-composite material (all claimed). ADVANTAGE - The titanium dioxide-graphene nano-composite material has efficient photocatalytic performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) performing surface modification of graphite alkene comprises dispersing the graphene into the solvent to form the graphene oxide solution and adding a modifying agent and the graphene with the graphene oxide solution under the ultrasonic wave in a surface modifier, where the modifier comprises pyrene, naphthalene or naphthalene derivatives; (2) preparing graphene nano-composite material using titanium dioxide comprising making a graphene-containing alcohol solution with surface modified titanium containing compounds, and preparing titanium dioxide-graphite nano composite material, where the composite material is provided with a set of titanium dioxide-graphene composite nano-particle each nanoparticles comprise surface modified graphene dispersedly located on surface of graphite alkene titanium dioxide particles and the composite material contains 5-20 wt.% of graphene based on the total weight of composite material; and (3) titanium dioxide-graphite nano-composite material.