▎ 摘　　要

NOVELTY - Preparing a macroscopic three-dimensional carbon nitride/reduced graphene oxide (rGO) composite material, comprises: (i) selecting a nitrogen-containing precursor material, conducting low temperature pyrolysis and performing constant-temperature reflux purification for 6 hours, centrifuging, washing and drying to obtain a pure precursor melem; (ii) conducting reduction reaction on the precursor melem using hydrazine hydrate as reducing agent under hydrothermal conditions of more than 100° C for more than 6 hours, repeating acid washing and alkali washing alternatively and drying to obtain pure melem hydrazine material; (iii) thermal polymerizing melem hydrazine at greater than 400° C in air atmosphere to form carbon nitride polymer; and (iv) dispersing carbon nitride polymer in graphene oxide aqueous solution, transferring the mixed solution to a PTFE reaction kettle, and reacting to obtain hydrogel, then dialyzing the carbon nitride/RGO hydrogel, and drying to obtain solid. USE - The method is useful for preparing a macroscopic three-dimensional carbon nitride/reduced graphene oxide composite material, which is useful for photocatalytic uranium reduction (claimed), and in various environments such as strong acid, high salt, and irradiation. ADVANTAGE - The method: produces composite material having excellent light response properties, electrochemical properties, adsorption properties and catalytic activity, high light response characteristics, which lays a foundation for preparing various carbon nitride-based photocatalytic materials; is simple and convenient operation process, convenient to operate; and can realize the production at a certain scale. DETAILED DESCRIPTION - Preparing a macroscopic three-dimensional carbon nitride/reduced graphene oxide (rGO) composite material, comprises: (i) selecting a nitrogen-containing precursor material, conducting low temperature pyrolysis at less than 450° C and performing constant-temperature reflux purification for 6 hours, centrifuging, washing and drying to obtain a pure precursor melem; (ii) conducting reduction reaction on the precursor melem using hydrazine hydrate as reducing agent under hydrothermal conditions of more than 100° C for more than 6 hours, repeating acid washing and alkali washing alternatively and drying to obtain pure melem hydrazine material; (iii) thermal polymerizing melem hydrazine at greater than 400° C in air atmosphere to form carbon nitride polymer; and (iv) dispersing carbon nitride polymer in graphene oxide aqueous solution, transferring the mixed solution to a PTFE reaction kettle, and reacting at greater than 100° C for greater than 6 hours to obtain hydrogel, then dialyzing the carbon nitride/RGO hydrogel, and drying to obtain solid.