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Preparation method of alumina/oxidized graphene/polyvinyl alcohol composite nanofiltration membrane

A composite nanofiltration membrane, polyvinyl alcohol technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of poor pure water flux and interception effect, and achieve the effect of improving salt interception rate

Active Publication Date: 2019-09-27
SANDA FILM SCI & TECH XIAMEN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few applications in the preparation of nanofiltration membranes. At present, pure graphene oxide and graphene oxide composite nanofiltration membranes are relatively poor in pure water flux and retention.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Prepare graphene oxide solution with improved Hummers method: get a 1000mL beaker, wash and dry, add 3g flake graphite, slowly add 360mL concentrated sulfuric acid (98%H 2 SO 4 ) and 40mL concentrated phosphoric acid (95%H 3 PO 4 ), then slowly add 18g potassium permanganate (KMnO 4 ); the beaker was moved to a 50°C oil bath and stirred for 12h. Take out the beaker and let it cool down to room temperature naturally. The reaction solution was slowly poured into 400mL dilute hydrogen peroxide (containing 18ml 30% H 2 o 2 ) on ice cubes, the solution turned bright yellow;

[0025] (2) The above-mentioned graphene oxide (GO) solution is cross-flow filtered with a 0.05 μm tubular ceramic membrane for impurity removal, and the graphene oxide solution after impurity removal is obtained; the basic principle is to use the pore size of the ceramic membrane to sieve Function, that is, the filter pore size of the ceramic tubular membrane is smaller than the size of the G...

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Abstract

The invention discloses a preparation method of an alumina / oxidized graphene / polyvinyl alcohol composite nanofiltration membrane. The preparation method comprises following steps: Hummers method is adopted to prepare oxidized graphene, homogeneous precipitation method is adopted to cover an formed oxidized graphene layer with an amorphous nanometer alumina thin layer uniformly so as to obtain a monomer used for layer by layer self assembling; polyethersulfone is taken as a substrate, is coated with a layer of polyvinyl alcohol, and is coated with a layer of the nanometer alumina / oxidized graphene composite monomer, alternative coating of the above two monomers is carried out so as to obtain the nanometer alumina / oxidized graphene / polyvinyl alcohol composite nanofiltration membrane. The surface of the nanometer alumina / oxidized graphene / polyvinyl alcohol composite nanofiltration membrane contains a large amount of hydrophilic groups such as hydroxyl and carboxyl, so that pure water flux is high; and at the same time, the film surface is negatively charged, so that film layer salt retention rate is increased.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation, and in particular relates to a preparation method of aluminum oxide / graphene oxide / polyvinyl alcohol composite nanofiltration membrane. Background technique [0002] Nanofiltration, developed in the 1980s, is a new type of pressure-membrane-driven process. The pore size range of nanofiltration membrane is between 0.5-2nm, which is a kind of separation membrane between ultrafiltration membrane and reverse osmosis membrane. At present, the main preparation methods of nanofiltration membranes include interfacial polymerization method, phase inversion method, charging method and blending method, etc. Among them, interfacial polymerization method is the most widely used method at present. The interfacial polymerization method is mainly to form an ultra-thin polyamide functional layer through the polymerization reaction of the polyamine monomer in the water phase and the po...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D69/10
CPCB01D67/0088B01D69/02B01D69/125B01D69/10B01D61/027B01D2325/14B01D2325/36
Inventor 陈云强洪昱斌方富林蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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