Method for preparing high-throughput and anti-pollution polyisophthaloyl metaphenylene diamine nano-filtration membranes

Abstract

The invention discloses a method for preparing high-throughput and anti-pollution polyisophthaloyl metaphenylene diamine nano-filtration membranes, and belongs to the field of technologies for preparing membranes. The method includes sulfonating polyether ether ketone concentrated sulfuric acid, cleaning the polyether ether ketone concentrated sulfuric acid until the polyether ether ketone concentrated sulfuric acid is neutral and drying the polyether ether ketone concentrated sulfuric acid to obtain sulfonated polyether ether ketone; adding 0.01-1 wt% of treated graphene oxide and 0.01-10 wt% of sulfonated polyether ether ketone into N, N-dimethylacetamide (DMAC) to obtain mixtures, placing the mixtures in a cell grinder and treating the mixtures to obtain dispersion liquid; adding additives into the dispersion liquid with the graphene oxide and the sulfonated polyether ether ketone, stirring the additives and the dispersion liquid to obtain first mixtures, then adding dried PMIA [poly(m-phenylene isophthalamide)] into the first mixtures, dissolving the dried PMIA and the first mixtures at the temperature of 80 DEG C to obtain second mixtures, mechanically stirring the second mixtures, carrying out vacuum defoaming on the second mixtures, preserving the second mixtures for standby application and forming the high-throughput and anti-pollution polyisophthaloyl metaphenylene diamine nano-filtration membranes by means of scraping. The method has the advantages that the method is easy to implement, contact angles of the high-throughput and anti-pollution polyisophthaloyl metaphenylene diamine nano-filtration membranes prepared by the aid of the method can be reduced and reach approximately 45 degrees from the original approximately 78 degrees under the condition that the retention rates keep rising, and the hydrophilicity and the anti-pollution performance of the high-throughput and anti-pollution polyisophthaloyl metaphenylene diamine nano-filtration membranes can be greatly improved.

Description

Technical field [0001] The invention relates to a nanofiltration membrane modification method, in particular to a poly(metaphenylene isophthalamide) nanofiltration with high flux and anti-pollution prepared through the synergistic effect of graphene oxide and sulfonated polyether ether ketone The membrane method belongs to the technical field of membrane preparation. Background technique [0002] Nanofiltration has attracted more and more attention due to its unique separation characteristics. Nanofiltration membranes are between reverse osmosis and ultrafiltration membranes in performance. They are especially suitable for separating pollutants and divalents in the molecular weight range of 200-1000. , High-priced inorganic salts, etc., and can retain some of the ions that are beneficial to the human body. It plays a unique role in many fields such as drinking water purification, wastewater treatment, classification and concentration of biochemical products, and food industry, s...

AI Technical Summary

Problems solved by technology

At present, there are many patents on the preparation of modified nanofiltration membranes by adding graphene oxide. However, although the addition of graphene oxide improves the flux of the membrane, the interception of the membrane will also be affected.