▎ 摘　　要

NOVELTY - Method for preparing supported titanium dioxide catalyst, involves (i) dissolving the titanium source compound in water to obtain uniform titanium source solution, adding soluble iron salt, soluble manganese salt and bentonite, and then adding precipitant to carry out the aging reaction, separating, washing, drying and calcining to obtain iron-manganese-doped titanium dioxide supported by bentonite, and (ii) adding the iron-manganese-doped titanium dioxide supported by bentonite into water, stirring and adding reduced graphene oxide, drying after ultrasonic, and calcining to obtain bentonite/iron-manganese-doped titanium dioxide/reduced graphene oxide composite material. USE - The method is used for preparing supported titanium dioxide catalyst, which is used for degradation of organic pollutants (all claimed). ADVANTAGE - The catalyst has high visible light catalytic activity and excellent adsorption, quickly adsorbs organic matter, promotes the enrichment of organic matter around titanium dioxide particles, and quickly explains organic pollutants and achieves the purpose of rapid and efficient degradation of organic matter.