▎ 摘　　要

NOVELTY - Preparing carbon nitride-graphene-manganese dioxide bifunctional catalyst involves calcining, acidifying carbon nitride precursor to obtain protonated carbon nitride, reacting manganese acetate and inorganic base under action of disodium ethylenediaminetetraacetic acid and catalyst to obtain manganese dioxide, reacting manganese dioxide and silane coupling agent in a solvent to obtain aminated manganese dioxide, and filtering successively graphene dispersion and the aminated manganese dioxide dispersion on the filter membrane to obtain first solid. USE - Method for preparing carbon nitride-graphene-manganese dioxide bifunctional catalyst for use in catalytic treatment of water and sewage (claimed). ADVANTAGE - The prepared catalyst can degrade and mineralize organic pollutants and improve the treatment efficiency of the water and the sewage. DETAILED DESCRIPTION - Preparing carbon nitride-graphene-manganese dioxide bifunctional catalyst involves calcining, acidifying carbon nitride precursor to obtain protonated carbon nitride, reacting manganese acetate and inorganic base under action of disodium ethylenediaminetetraacetic acid and catalyst to obtain manganese dioxide, reacting manganese dioxide and silane coupling agent in a solvent to obtain aminated manganese dioxide, filtering successively graphene dispersion and the aminated manganese dioxide dispersion on the filter membrane to obtain first solid, placing the obtained first solid in water to carry out a hydrothermal reaction, filtering, drying the product to obtain graphene/manganese dioxide material, placing the graphene/manganese dioxide material on the filter membrane with the graphene layer upward, subjecting protonated carbon nitride dispersion liquid to suction-filteration to the filter membrane to obtain second solid, placing the second solid in water to react, filtering the product, and drying to obtain the carbon nitride/graphene/manganese dioxide bifunctional catalyst.