Preparation method of amino-modified graphene oxide composite positive permeable film

Abstract

The invention provides a preparation method of an amino-modified graphene oxide composite positive permeable film. The method is characterized by comprising the following specific steps: mixing graphene oxide, dimethyl formamide, organic amine and dicyclohexyl carbimide, and performing ultrasonic treatment; reacting for 40-50 hours at the temperature of 100-150 DEG C; adding absolute ethyl alcohol, and standing and filtering to obtain a precipitate; washing and drying the precipitate to obtain amino-modified graphene oxide; mixing the amino-modified graphene oxide with a solvent, performing ultrasonic treatment, and adding an additive and a film formation polymer into a mixed solution to prepare a casting film solution; de-foaming to prepare a base film through a phase inversion method, and immersing the base film in pure water for later use; and pouring a metaphenylene diamine solution and trimesoyl chloride to the surface of the base film, performing a contact reaction, washing the surface of the film with an organic solvent, and drying the film to obtain the amino-modified graphene oxide composite positive permeable film. The amino-modified graphene oxide composite positive permeable film is high in mechanical strength, high in chemical stability, large in permeation flux of the pure water, and high in salt rejection rate.

Description

technical field [0001] The invention relates to a preparation method of an amino-modified graphene oxide composite forward osmosis membrane. Background technique [0002] Due to the depletion of fresh water resources, seawater desalination technology is getting more and more attention. Among them, the energy consumption of reverse osmosis technology in seawater desalination has been reduced from eighty-nine kilowatt-hours of electricity to produce one ton of water at the beginning to four kilowatt-hours of electricity to produce one ton of water. There is not much room for development. In order to further reduce the cost of energy consumption, we can only hope for new technologies in the future. Compared with reverse osmosis technology, forward osmosis technology has unique advantages in this respect, and will not cause environmental pollution. It will replace reverse osmosis and become a superior seawater desalination technology. [0003] Forward osmosis technology provid...

AI Technical Summary

Problems solved by technology

However, the current forward osmosis membrane is still in the research and development stage, and the commercially produced forward osmosis flat membrane has the problems of low pure water permeation flux, high salt permeation flux and poor mechanical strength.