▎ 摘　　要

NOVELTY - Preparing porous graphene oxide involves mixing graphene oxide suspension with potassium permanganate in weight ratio of 100:0.2-3 to obtain first mixture, where concentration of graphene oxide suspension is 0.2-8 mg/ml, heating first mixture at 70-100 degrees C for 2-8 minutes, mixing heated mixture with mixed liquor comprising hydrogen peroxide and hydrochloric acid in volume ratio of 30-1:1 to obtain second mixed liquor, centrifuging second mixed liquor, filtering and washing until manganese content is less than 1 parts per million. USE - Method for preparing porous graphene oxide used in preparing porous graphene oxide-coated slow release fertilizer (claimed). ADVANTAGE - The method enables to prepare porous graphene oxide used in preparing porous graphene oxide-coated slow release fertilizer in simple and fast manner, prepared microspheres of porous graphene oxide-coated slow-release fertilizer are easy to diffuse, have strong hydrophilicity, strong compatibility with environment and no pollution to environment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing porous graphene oxide-coated slow-release fertilizer, which involves: (A) mixing fertilizer with porous graphene oxide in weight ratio of 5-2000:1 to obtain second mixture; (B) adjusting pH; (C) stirring at room temperature for 1-5 hours to obtain mixed solution; (D) adding vegetable oil in weight ratio of 1:3-10, heating at 85-95 degrees C to obtain second mixed liquor; (E) centrifuging; (F) filtering; and (G) washing till removing vegetable oil to obtain porous graphene oxide-coated slow-release fertilizer.