▎ 摘　　要

NOVELTY - Preparing straw cellulose/graphene oxide composite material comprises compounding straw cellulose and graphene oxide under ultrasonic conditions. USE - The composite material is useful for wastewater treatment (claimed). ADVANTAGE - The method: is simple, and economical; has mild experimental condition; and can consumes low energy. The composite material: has good adsorption effect on heavy metal ions, high wastewater treatment efficiency, and high recycling efficiency after analysis and adsorption; and environmentally-friendly. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the straw cellulose/graphene oxide composite material comprising ultrasonically shaking the graphite oxide in deionized water for 30 minutes, adding straw cellulose, ultrasonically stirring for 10 minutes, adding solution containing sodium hydroxide and urea, and stirring for 10 minutes to obtain straw cellulose/graphene oxide mixed solution; and (2) Use of straw cellulose/graphene oxide composite material in wastewater treatment comprising adjusting the pH value of the wastewater to 2-8, adding the straw cellulose/graphene oxide composite material, shaking at room temperature for 30-120 minutes, and centrifuging the solution to obtain purified wastewater.