Modified Graphene Oxide Material Preparation And Its Adsorption Properties Of Methylene Blue In Waster Water

Graphene oxide(GO),as a precursor of graphene,not only inherit the merits of graphene,but also introduce amount of oxygen-containing functional groups,such as-COOH,-OH and C-O-C.These groups could be used as anchoring sites for contaminant occupied,which hold great promise for removal and recovery of contaminants from aqueous solutions.However,GO has a trouble in separation due to its hydrophilic nature,which might severely hinder its practical application.The modification method was taken to increase the properties and enhance the adsorption ability of biochar.In this paper,the magnetic chitosan-lignosulfonate(MCLS)were used to produce a modified GO nanocomposites to adsorb MB molecules from the aqueous solution.In this work,a renewable material MCLS/GO was prepared successfully by hydrothermal reaction,and characterized by a series of means(SEM,XRD,VSM,FTIR,XPS and Zeta-potential)to analyze chemical and physical properties.The results showed that the material has a lager surface area and magnetization,and there are more oxygen-containing functional groups on the surface of material,which might be beneficial for removing more contaminant.In this study,batch experiment was carried out to study the effects of pH,ionic strength,temperature and sodium dodecylbenzene sulfonate(SDBS)on methylene blue(MB)adsorption.The results indicated that MB removal was found to be more effective at higher pH value and temperature.The adsorption process could be affected by the ionic strength,particularly at higher concentration.In addition,the presence of SDBS had a positive effect on MB adsorption onto MCLS/GO.Isotherm and kinetics synthesis were well-fitted by Langmuir isotherm model and pseudo-second-order model.Intra-particle diffusion model indicated that both of film diffusion and intra-particle diffusion were the rate-controlling process.Thermodynamic analysis showed that the adsorption reaction was an endothermic and spontaneous process.Adsorption mechanism was proposed to be electrostatic attraction,?-? stacking interaction and hydrogen bonding via FTIR.The adsorbed MB could be effectively regenerated by 0.5 mol L-1 HCl solutions,and it kept good adsorption ability for MB after sixth cycles.In conclusion,MCLS/GO has excellent MB adsorption ability and physical and chemical properties.It is a great potential cost-effective adsorbent for water pollutant.MCLS/GO could be conveniently separated from waterbody by an external magnet and utilized as an efficient adsorbent for environment purification.