Study On The Preparation And Properties Of Graphene Oxide Based Composite

In this paper,two kinds of three-dimensional porous graphene oxide/lignosulfonate composites and graphene oxide/alkali lignin composites were prepared by a facile and green method.Then,the adsorption of methylene blue in water by composites was studied.With polyurethane foam as the substrate,covering a layer of hydrophobic substances on the surface,to prepare a super-hydrophobic modified graphene oxide/polyurethane foam,and studied its oil-water separation performance.The main research contents and conclusions are as follows:(1)The morphology and structure of the graphene oxide/lignosulfonate composites(GO-CS-LS)were characterized by SEM,FTIR,XRD and Raman.The adsorption of methylene blue(MB)in water by the GO-CS-LS was researched.The results showed that the initial concentration of MB was 100 mg/L,the optimum addition amount of GO-CS-LS was 0.2 g/L,and the removal rate of MB was 99.6%.The adsorption kinetics research results showed that the adsorption process fitted well with the pseudo-second-order kinetics model and was chemisorption.At the same time,it was found that intraparticle diffusion was not the only rate-controlling step of the adsorption process.The adsorption isotherm research results showed that the adsorption process fitted well with the Langmuir isotherm model and was monolayer adsorption.The maximum adsorption capacity of MB onto GO-CS-LS is 1023.98 mg/g,at 303K.Adsorption thermodynamics research results showed that the adsorption of MB onto GO-CS-LS is a spontaneous endothermic process,and the randomness increases.(2)The morphology and structure of the graphene oxide/alkali lignin composites(GO-CS-AL)were characterized by SEM,FTIR,XRD and Raman.The adsorption of methylene blue in water by the GO-CS-AL was researched.The results showed that the initial concentration of MB was 100 mg/L,the optimum addition amount of GO-CS-AL was 0.2 g/L,and the removal rate of MB was 99.3%.The adsorption kinetics research results showed that the adsorption process fitted well with the pseudo-second-order kinetics model and was chemisorption.At the same time,it was found that intraparticle diffusion was not the only rate-controlling step of the adsorption process.The adsorption isotherm research results showed that the adsorption process fitted well with the Langmuir isotherm model and was monolayer adsorption.The maximum adsorption capacity of MB onto GO-CS-AL is 1185.98 mg/g,at 303K.Adsorption thermodynamics research results showed that the adsorption of MB onto GO-CS-AL is a spontaneous and endothermic process,and the randomness increases.(3)The morphology and structure of the modified graphene oxide/polyurethane foam composites(RGO-PU)were characterized by SEM,FTIR and XRD.The hydrophobic properties research results showed that the RGO-PU had superhydrophobic and super-lipophilic.The contact angle of water is 153.3±1.2°,the contact angle of oil is 0° and the RGO-PU has excellent mechanical properties.The oil-water separation research results showed that the RGO-PU can rapidly separated oil from oil-water mixture.The adsorption capacity of the oil or organic solvent from 50 to70 g/g,and the RGO-PU exhibits high cycle performance.