In order to explore the preparation and adsorption properties of small molecules and graphene crosslinking materials,graphene hydrogels were prepared by hydrothermal method,and three cross-linked graphene sponge materials were synthesized from ethylenediamine,1,3-Diaminopropane and Diethylene-triamine,respectively.The structure was characterized by SEM,FTIR and BET,and the difference of liquid adsorption capacity of three cross-linked graphene sponge materials before and after expansion was investigated.Methylene blue was further used as organics in sewage for adsorption simulation experiment.The results show that these series of graphene material have excellent adsorption properties,and the ad-sorption process conforms to the pseudo-second-order kinetic equation.With the increase of the number of carbons in cross-linked small molecular,the adsorption capacity increases by 26％and the adsorption rate increases to a certain extent.The adsorption performance after expansion is obviously better than that before expansion,which is raised by 1.37 times than before.
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