Preparation Of Magnetic Graphene Oxide Composite And Its Experimental Study On Adsorption Of Methylene Blue

The pollutant composition of printing and dyeing wastewater is complex,and it is difficult to biodegrade organic matter with high content and high color.It is an industrial wastewater that is difficult to treat.The adsorption method is a treatment method for printing and dyeing wastewater,but the traditional adsorbent has lower adsorption efficiency,higher cost,and is easy to cause secondary pollution.Graphene is a new type of carbon material,because of its special physical and chemical properties,it has good application prospects in water treatment as an adsorbent.In this study,a new graphene nanomaterial with high adsorption capacity and easy separation from water was prepared.The adsorption effect and adsorption performance of methylene blue and the co-adsorption of methylene blue and heavy metals were studied to speed up the graphene material in printing and dyeing wastewater Provide technical basis for processing applications.This subject uses self-made magnetic graphene oxide composite material as an adsorbent to study its adsorption performance for methylene blue.The research contents include: the preparation and characterization analysis of magnetic graphene oxide composite materials;the experimental study on the adsorption of methylene blue by magnetic graphene oxide composite materials;the experimental study of the co-adsorption of magnetic graphene oxide composite materials to methylene blue and heavy metals.The modified Hummers method was used to prepare graphene oxide,and then the magnetic particles were loaded on the surface of graphene oxide by chemical co-precipitation method to prepare magnetic graphene oxide composite material.SEM and XRD shows that the surface of the prepared graphene contains many folds,the surface area is large,which is convenient for adsorption,and the magnetic material is well loaded on the surface of the graphene.Since the magnetic graphene oxide composite material has good magnetic properties,it is easy to be separated from water,which overcomes the problem that the graphene material is dispersed in water and is not easy to recycle,thereby causing secondary pollution.Factors such as p H,temperature,and contact time have an effect on the adsorption performance of the magnetic graphene oxide composite material.When the p H = 7,the contact time is 1440 min,the temperature is 25 ° C,and there is no other interference in the water.The maximum unit adsorption capacity of methylene blue is 107.68 mg / L.The results of fitting the test data with the mathematical model show that the adsorption test is controlled by the general adsorption mechanism,the various parameters compound the objective adsorption law,and the calculated theoretical maximum unit adsorption amount is 109.29 mg / L,which is close to the actual measured value.After three cycles of desorption of composite materials,the regeneration rate can still reach more than 85%,with good reuse performance.In the presence of Cr(Ⅵ),Cd(Ⅱ)and Cu(Ⅱ)heavy metals alone,magnetic graphene oxide composites have certain adsorption properties for heavy metals;while in Cr(Ⅵ),Cd(Ⅱ)and When a certain heavy metal of Cu(Ⅱ)coexists with methylene blue,the adsorption of methylene blue by the composite material is affected,and the unit adsorption amount is slightly reduced,while the adsorption of heavy metals by the composite material is significantly inhibited,indicating that the magnetic graphene oxide composite material is The adsorption selectivity is higher than that of heavy metals.The magnetic graphene oxide composite material has an ideal adsorption effect for methylene blue.When heavy metals are present in the water,the adsorption selectivity for methylene blue is higher than that of heavy metals,and it has the characteristics of high regeneration rate and easy separation from water.