▎ 摘　　要

NOVELTY - A composite graphene chitosan aerogel is obtained by mixing chitosan aerogel, graphene and KH560 (RTM: gamma - glycidoxypropyltrimethoxysilane), and crosslinking the mixture. USE - Composite graphene chitosan aerogel used for adsorbing hexavalent chromium ions in wastewater (claimed). ADVANTAGE - The composite graphene chitosan aerogel has excellent mechanical strength and acid resistance, is easy to recycle and reused. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation of composite graphene chitosan aerogel, which involves (1) dispersing the chitosan aerogel powder in the acid solution and stirring fully to obtain dispersion (A), (2) adding graphene to dispersion (A) and performing ultrasonic dispersion to obtain dispersion (B), (3) adding KH560 (RTM: gamma -glycidoxypropyltrimethoxysilane) to dispersion (B), and heat to 50-100 degrees C for reaction to obtain a composite hydrogel, and (4) cooling the composite hydrogel at room temperature, and adding into a freeze-drying box for freeze-drying.