▎ 摘　　要

NOVELTY - Preparing biomass graphene by extracting cellulose in wheat straw comprises (i) desalting wheat straw pulp board, adding into reaction kettle with hydrochloric acid, heating, hydrolyzing, cooling, adding alkali to neutralize, cooling, neutralizing, filtering, drying and crushing, (ii) placing catalyst into water, mixing, (iii) adding straw extracting cellulose into the catalyst solution, stirring, deoxidizing, drying, (iv) heating precursor, heating, carbonizing, (v) acid processing secondary carbonization product, centrifuging, separating, washing and drying. USE - The method is useful for preparing biomass graphene by extracting cellulose in wheat straw. ADVANTAGE - The method is simple and economical and has high yield, strong production safety, controllable product size and physical properties. DETAILED DESCRIPTION - Preparing biomass graphene by extracting cellulose in wheat straw comprises (i) desalting the wheat straw pulp board, adding into the reaction kettle with hydrochloric acid, heating, hydrolyzing, cooling, adding alkali to neutralize, cooling, neutralizing, filtering, drying and crushing to obtain the straw extracting cellulose, (ii) placing the catalyst into water, mixing uniformly to obtain the catalyst solution, where the catalyst is iron(II) chloride, iron(III) chloride, potassium ferricyanide or potassium ferrocyanide, (iii) adding the straw extracting cellulose obtained in the step (i) into the catalyst solution obtained in the step (ii), stirring for 1-4 hours, high temperature deoxidizing, drying to obtain the precursor, where the high temperature deoxidization is specifically as follows: the microwave intensity is 4-7kW and temperature is 130-160 degrees C, reacting for 20 minutes to 1.5 hours, (iv) heating the precursor obtained in the step (iii) under a nitrogen, argon or hydrogen environment, where the heating temperature speed to 11-16 degrees C/minutes, heating to 300-450 degrees C, the precursor is pre-carbonized for 2-5 hours to obtain a pre-carbonized product, carbonizing the pre-product of nitrogen, argon or under hydrogen environment, continuously heating at speed to 5-12 degrees C/minutes, heating to 1000-1550 degrees C, carbonizing the pre-carbonized product for 5-10 hours for the second time to obtain the secondary carbonization product, (v) acid processing the secondary carbonization product, centrifuging, separating, washing the centrifugal filter cake with water till it is neutral, and drying to obtain the graphene biomass.