▎ 摘　　要

NOVELTY - Preparation of heterojunction composite photocatalyst involves: (1) dissolving nickel(II) nitrate hexahydrate, iron(III) nitrate nonahydrate, urotropine and trisodium citrate in deionized water, and stirring to get a transparent solution, then adding aqueous solution of graphene quantum dots (GQDs), pouring the mixed solution into a hydrothermal reactor, and hydrothermally reacting to prepare heterostructured GQDs/nickel ferrite nanosheet composite material; and (2) adding the composite material to a graphene oxide (GO) aqueous solution, then adding a crosslinking agent and a reducing agent, reducing GO to reduced GO (rGO) through low-temperature heating reaction to form a three-dimensional network structure, and simultaneously supporting the composite material on the graphene sheet layer to obtain three-dimensional network structure of rGO aerogel supported GQDs/nickel ferrite heterojunction composite photocatalyst. USE - The method is useful for preparing heterojunction composite photocatalyst, which is useful as working electrode material of photoelectrochemical conversion system and catalytic material for photocatalytic degradation of organic pollutants (all claimed) in wastewater. ADVANTAGE - The catalyst: has high specific surface area and conductivity; effectively inhibits the recombination of photogenerated electrons and holes; broadens the light absorption range; improves photocatalytic activity; and can realize the resource utilization and energy conversion of wastewater. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the heterojunction composite photocatalyst, which comprises a three-dimensional porous network structure, and a multi-dimensional electron transmission path.