Method for preparing graphene oxide and polyving akohol composite membrane through electrostatic spinning

Abstract

The invention relates to a method for preparing a graphene oxide and polyving akohol composite membrane through electrostatic spinning. The method comprises the steps that graphene oxide is added into deionized water, ultrasonic dispersion is conducted, the evenly-dispersed graphene oxide aqueous solution and polyving akohol are mixed, the mixed solution is heated and reacts for a period of time on the condition of stirring, the mixed solution is cooled to reach indoor temperature, a spinning solution of the graphene oxide and the polyving akohol is obtained, electrospinning is conducted on the spinning solution of the graphene oxide and the polyving akohol, the graphene oxide and polyving akohol composite membrane is obtained, the graphene oxide and polyving akohol composite membrane is processed in the mixed solution of acetone, deionized water, hydrochloric acid and a cross-linking agent, and then cross-linked graphene oxide and polyving akohol composite membrane is obtained.

Description

Technical field [0001] The present invention relates to a method for preparing a graphene oxide and polyvinyl alcohol composite film by electrostatic spinning, in particular to a spinning stock solution of graphene oxide and polyvinyl alcohol for electrospinning, which is obtained after treatment with a crosslinking agent Graphene oxide and polyvinyl alcohol composite membrane with high separation efficiency, good wet membrane strength and excellent water resistance, which can be used in the field of membrane separation and a preparation method thereof. Background technique [0002] Polyvinyl alcohol has high hydrophilicity, pollution resistance, good chemical stability, thermal stability and film-forming properties. Therefore, polyvinyl alcohol membranes are widely used in membrane separation such as ultrafiltration, nanofiltration, reverse osmosis and pervaporation. Technical field C, Kaya A. Desalination, 2010, 253(1):175-179.). However, polyvinyl alcohol membranes have defe...

AI Technical Summary

Problems solved by technology

However, there are defects such as low separation efficiency, poor wet film strength, and poor water resistance of polyvinyl alcohol membranes, which restrict the application of polyvinyl alcohol membranes to a certain extent.

The traditional method of preparing polyvinyl alcohol film usually adopts the solution casting method (Cai Bangxiao, Zhang Peiqin. Journal of East China University of Science and Technology: Natural Science Edition, 2006,32(2):235-240.), but the polyvinyl alcohol produced by the solution casting method The membrane has disadvantages such as uneven pore size distribution, small specific surface area, and low separation efficiency.

Therefore, the biggest challenge in the preparation and application of polyvinyl alcohol membranes is how to solve the defects of poor wet film strength and water resistance of polyvinyl alcohol membranes and prepare polyvinyl alcohol membranes with high flux and high filtration efficiency.

[0003] Jiang Yunpeng and others used the Stober method to prepare nanoscale dispersed SiO 2 sol, and doped it into polyvinyl alcohol aqueous solution to obtain a uniform SiO 2 Composite film with polyvinyl alcohol (Jiang Yunpeng, Wang Rongshu. Polymer Materials Science and Engineering, 2002,18(5):177-180.), by adding SiO 2 Composite with polyvinyl alcohol, polyvinyl alcohol and nano-SiO 2 The hydroxyl groups on the surface form hydrogen bonds, which effectively improves the mechanical strength of the polyvinyl alcohol membrane. The polyvinyl alcohol membrane produced by this method still has the disadvantages of poor water resistance, low wet film strength, and low separation efficiency.