▎ 摘　　要

NOVELTY - The comprehensive utilization method of waste sulfuric acid and washing waste water in preparation process of graphene oxide, involves (1) taking waste sulfuric acid and washing waste water generated in the process of producing graphene oxide, and filtering, (2) adding functional molecules in the filtered manganese-containing sulfuric acid and washing waste water, (3) adding barium carbonate to washing waste water, and stirring to prepare barium carbonate slurry, (4) conveying the filtered waste sulfuric acid into the reactor, stirring, conveying the barium carbonate slurry to inside of the reactor, controlling the pH value of the reaction system in the process, continuously reacting, aging, and filtering to obtain filtrate (I) and barium sulfate precipitate, and (5) adjusting the pH of the filtrate (I), slowly adding potassium permanganate, stirring and filtering to obtain filtrate (II) and manganese dioxide precipitate. USE - Comprehensive utilization method of waste sulfuric acid and washing waste water in preparation process of graphene oxide. ADVANTAGE - The method comprehensively utilizes the mixed acid solution of sulfuric acid and the washing wastewater in the process of preparing graphene oxide, and the by-products formed are diversified, so as to realize the complete treatment and closed-loop production of the mixed acid and wastewater in the process of preparing graphene oxide. DETAILED DESCRIPTION - The comprehensive utilization method of waste sulfuric acid and washing waste water in preparation process of graphene oxide, involves (1) taking waste sulfuric acid and washing waste water generated in the process of producing graphene oxide, and filtering to remove graphene oxide microsheets, suspended particles, and macromolecular impurities respectively, (2) adding one, two or more combinations of functional molecules respectively in the filtered manganese-containing sulfuric acid and washing waste water for inhibiting the sedimentation of manganese ions in the process of barium sulfate precipitation, where the function molecules comprise acetic acid, hydrochloric acid, benzoic acid, formic acid, edetate, ethylenediamine, ethylene glycol, polyethylene glycol, glucose, stearic acid, cellulose, polyoxyethylene, polyacrylamide and other water-soluble polymer solution, (3) taking a certain amount of barium carbonate, adding to washing waste water in step (2), and fully stirring to prepare barium carbonate slurry, (4) conveying the filtered waste sulfuric acid into the reactor, stirring, conveying the barium carbonate slurry obtained in the step (3) to inside of the reactor, controlling the pH value of the reaction system between 1.5-7.5 in the process, continuously reacting for a period of time, aging after reaction, and filtering the aged material to obtain filtrate (I) and barium sulfate precipitate, and (5) adjusting the pH of the filtrate (I) to 4-10, slowly adding potassium permanganate to the filtrate (I) while stirring, fully stirring and filtering to obtain filtrate (II) and manganese dioxide precipitate.