▎ 摘　　要

NOVELTY - Dyeing method of cotton fabric using biological polishing residual liquid involves (a) taking out textile after biological polishing treatment is finished and filtering residual liquid using a sand core funnel, (b) carrying out ultrasonic treatment on graphene oxide prepared by chemical method for 10 minutes, (c) adding the graphene oxide to the filtered biological polishing residual liquid, and (d) adjusting pH of residual liquid to 8 using sodium hydroxide, increasing temperature to 40 degrees C and heat-preserving for 5 minutes. USE - Method is useful for dyeing cotton fabric using biological polishing residual liquid (claimed). DETAILED DESCRIPTION - Dyeing method of cotton fabric using biological polishing residual liquid involves (a) taking out textile after biological polishing treatment is finished and filtering residual liquid using a sand core funnel, (b) carrying out ultrasonic treatment on graphene oxide prepared by chemical method for 10 minutes, (c) adding the graphene oxide to the filtered biological polishing residual liquid, where the mass ratio of graphene oxide to cellulase is 3:1, (d) adjusting pH of residual liquid to 8 using sodium hydroxide, increasing temperature to 40 degrees C, heat-preserving for 5 minutes, adjusting pH of the residual liquid to 4.5 using sulfuric acid, heat-preserving at 40 degrees C for 10 minutes, continuously adjusting pH of the residual liquid to 2.5 and heat-preserving at 40 degrees C for 15 minutes, (e) filtering the residual liquid using a microporous filter membrane with pore size of 0.22 mu m and 0.1 mu m, and (f) adjusting pH value of residual liquid to initial pH value of reactive dye, adjusting concentration of sodium sulfate electrolyte to dyeing level of normal reactive dye and dyeing cotton fabric using residual liquid.