▎ 摘　　要

NOVELTY - Preparing graphene oxide and alginate composite aerogel comprises (i) adding a reducing agent and alginate into aqueous graphene oxide solution and ultrasonically dispersing to obtain ultrasonic dispersion, and adding crosslinking agent solution into the ultrasonic dispersion to obtain mixture A; (ii) adding foaming agent solution into the mixture A, stirring and foaming to obtain mixture B; and (iii) subjecting the mixture B to reduction reaction, cooling the reaction product to room temperature, soaking, washing, freezing, thawing and drying. USE - The aerogel is useful for processing organic dye contaminant in sewage (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene oxide and alginate composite aerogel prepared by the above method.