Chlorosulfonic Acid And Polyethyleneimine Decorated Graphene Oxide Absorbents:Syntheses,Structure And Absorption Behavior For Metal Ions

In recent years,nano-materials is a hot topic,it spanned a wide range of subjects which has high theoretical and practical values.The raw material of natural flake graphite which is used to prepare graphite oxide is cheap and easy to be obtained,and the natural flake graphite has caused great concern because of its ideal physical and chemical properties.Firstly,we prepared graphite oxide from natural graphite flake by Hummers method,then,through the method of ultrasonic stripping,we get monolayers graphene oxide from graphite oxide,the graphene oxide was characterized by a series of methods such as IR?XRD?TGA and SEM.The results show that we have successfully prepared the graphene oxide and there were a lot of oxygen functions on the surface of the graphene oxide such as hydroxyl,carboxyl,carbonyl,epoxy group,etc.Then the polyethylene imine which molecular weight is 17000 is used to graft on to the Graphene oxide,and we got three kinds of different PEI content graphene oxide resins.At the same time,the graphene oxide was modified by chlorosulfonic acid,through a series of methods we can concluded that the resins are our target resins.Finally,the four kinds of resins were used to adsorb four kinds of rare-earth ions such as Y3+?Eu3+?Pr3+?Nd3+ and two kinds of heavy metal ions such as Cu2+ and Ni2+ in different conditions.The results show that the four kinds of resins all had different effects on the adsorption of the six kinds of metal ions.At the same time,we also discussed the effect of different conditions of adsorption resins for metal ions,for example,the adsorption capacities were different because of different pH and different temperatures.After the adsorption,the resins were desorbed by hydrochloric acid with concentration of 2 mol/L,the experimental results showed that,the desorption rate was nearly to 100%with 2mol/L hydrochloric acid as desorbing agent.The results showed that modified graphene oxide resins have certain effect on the metal ion adsorption and the desorption was pretty good,this is good for the recovery and regeneration of resins.Amination resin which was prepared by polyethylene imine as grafting agent and sulfonating resin which was prepared by chlorosulfonic acid have many advantages,such as the manufacture process is simple,the adsorption effect is obvious.These are all significant for the metal recovery and enrichment.