Polyamide reverse osmosis (RO) membrane modified through bulk doping of CNO, and preparation method and application thereof

A technology of reverse osmosis membrane and polyamide, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of decreased rejection rate, poor chlorine resistance, shortened membrane service life, etc., and achieve flux improvement, Membrane performance is stable and the effect of prolonging the service life

Inactive Publication Date: 2019-01-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current polyamide reverse osmosis membrane has poor chlorine resistance. Under the action of free chlorine, the cross-linked aromatic polyamide on the polyamide reverse osmosis membrane is chlorinated and degraded, resulting in a gradual decline in the rejection rate of the polyamide reverse osmosis membrane and a reduction in membrane efficiency. service life

Method used

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  • Polyamide reverse osmosis (RO) membrane modified through bulk doping of CNO, and preparation method and application thereof
  • Polyamide reverse osmosis (RO) membrane modified through bulk doping of CNO, and preparation method and application thereof
  • Polyamide reverse osmosis (RO) membrane modified through bulk doping of CNO, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Clean the polysulfone (PS) ultrafiltration membrane (molecular weight cut-off 30000) with pure water and use it as a support layer for subsequent use;

[0031] (2) Configure an aqueous m-phenylenediamine (MPD) solution with a mass fraction of 2.0%; disperse 0.005 g / L of CNO in the MPD solution by ultrasonication for one hour to obtain a CNO-MPD aqueous phase solution;

[0032] (3) Configuration of the oil phase solution: the configuration mass fraction is 0.1% trimesoyl chloride (TMC) n-hexane solution;

[0033] (4) Preparation of CNO-modified polyamide reverse osmosis membrane: Take out the PS membrane and fix it on a glass plate, dry the water with an air knife, pour the CNO-MPD aqueous phase solution on the surface of the PS membrane, and pour off the excess after 5 minutes The water phase solution was blown dry with an air knife, and then the oil phase solution was poured on the membrane surface, reacted for 1 minute, and poured off the excess oil phase solution...

Embodiment 2

[0043] (1) Clean the polysulfone (PS) ultrafiltration membrane (molecular weight cut-off 30000) with pure water and use it as a support layer for subsequent use;

[0044] (2) Configure a m-phenylenediamine (MPD) aqueous solution with a mass fraction of 2.0%; disperse 0.01 g / L of CNO in the MPD solution by ultrasonication for one hour to obtain a CNO-MPD aqueous phase solution;

[0045] (3) Configuration of the oil phase solution: the configuration mass fraction is 0.1% trimesoyl chloride (TMC) n-hexane solution;

[0046] (4) Preparation of CNO-modified polyamide reverse osmosis membrane: Take out the PS membrane and fix it on a glass plate, dry the water with an air knife, pour the CNO-MPD aqueous phase solution on the surface of the PS membrane, and pour off the excess after 5 minutes The water phase solution was blown dry with an air knife, and then the oil phase solution was poured on the membrane surface, reacted for 1 minute, and poured off the excess oil phase solution. ...

Embodiment 3

[0056] (1) Clean the polysulfone (PS) ultrafiltration membrane (molecular weight cut-off 30000) with pure water and use it as a support layer for subsequent use;

[0057] (2) Configure a m-phenylenediamine (MPD) aqueous solution with a mass fraction of 2.0%; disperse 0.02 g / L of CNO in the MPD solution by ultrasonication for one hour to obtain a CNO-MPD aqueous phase solution;

[0058] (3) Configuration of the oil phase solution: the configuration mass fraction is 0.1% trimesoyl chloride (TMC) n-hexane solution;

[0059] (4) Preparation of CNO-modified polyamide reverse osmosis membrane: Take out the PS membrane and fix it on a glass plate, dry the water with an air knife, pour the CNO-MPD aqueous phase solution on the surface of the PS membrane, and pour off the excess after 5 minutes The water phase solution was blown dry with an air knife, and then the oil phase solution was poured on the membrane surface, reacted for 1 minute, and poured off the excess oil phase solution. ...

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Abstract

The invention belongs to the technical field of functional materials, and relates to a polyamide reverse osmosis (RO) membrane modified through bulk doping of CNO, and a preparation method and application thereof. The preparation method is characterized in that the CNO is added into an aqueous solution for interfacial polymerization reaction of a polyamide RO membrane to prepare the CNO-hybridizedmodified polyamide RO membrane. The polyamide RO membrane and the preparation method and application thereof have the advantages that the CNO, which is rich in oxygen-containing groups and has high water dispersibility and potential oxidation resistance, is added into a polyamide membrane separation layer through bulk doping, so that the chlorine resistance of the prepared hybrid membrane is greatly improved, and the service life of the membrane is prolonged; and the modified polyamide membrane prepared through the method achieves a higher flux, a basically unchanged retention rate, high chlorine resistance, and high stability in use.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a polyamide reverse osmosis membrane modified by bulk doping with CNO and its preparation method and application. Background technique [0002] Polyamide reverse osmosis membranes are widely used in ultrapure water preparation, seawater desalination and brackish water desalination, etc. However, the current polyamide reverse osmosis membrane has poor chlorine resistance. Under the action of free chlorine, the cross-linked aromatic polyamide on the polyamide reverse osmosis membrane is chlorinated and degraded, resulting in a gradual decline in the rejection rate of the polyamide reverse osmosis membrane and a reduction in membrane efficiency. service life. Therefore, the modification of chlorine resistance of polyamide reverse osmosis membrane is one of the hotspots of modification research. Contents of the invention [0003] The object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D61/02C02F1/44
CPCB01D61/025B01D67/0006B01D71/56B01D2325/30C02F1/441Y02A20/131
Inventor 董立峰邵斐斐于立岩董红周徐纯威仪展
Owner QINGDAO UNIV OF SCI & TECH
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