Preparation And Properties Of Graphene Seawater Desalination Membrane

In today's society,the lack of fresh water resources has become an increasingly serious problem.As the most widely used seawater desalination technology,the core component of reverse osmosis method,reverse osmosis membrane has been the focus of many scholars.As a new type of graphene,Graphene oxide has been gradually applied to the development of reverse osmosis membranes and has achieved great results.In this paper,used improved Hummer method manufacture GO nanosheets.The graphite oxide and the polyimide(GO/PI)nanocomposite membrane and graphene oxide and cellulose acetate(GO/CA)nanocomposite membrane were prepared by dispersing GO into a polyimide PI matrix by using a vacuum filtration device.The membrane were conduct various tests and desalinization test of salt water.The experimental research results as followed:1.Adding an appropriate amount of GO(1.0%)to the PI matrix can improve the surface morphology of the membrane and change the cross section of the membrane.The hydrophilic properties of the membrane are improved;tensile strength and mechanical strength are also enhanced.Desalination experiments show that the addition of GO nanosheets brings high water permeability and ion repellency to the composite membrane,and the two performance indexes continue to increase with the increase of temperature.After many experiments,the desalination performance of the membrane can still maintain a high level.2.When GO is added to the CA matrix,the pore diameter of the membrane becomes small,and the surface becomes smooth and flat;the cross section of the membrane changes from a finger shape to a sponge shape;The hydrophilicity of the membrane is improved;the surface roughness of the membrane is reduced;the thermal stability and mechanical strength of the membrane are also improved.During the desalination test,the water flux of the membrane is reduced after the addition of GO,and the desalination performance and durability are improved.The main purpose of this paper is to use the combination of GO and two substrates to test and analyze the properties of the two membrane s,and to provide two methods for the development of reverse osmosis membranes,which is of great significance for the development of seawater desalination reverse osmosis membranes.