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Preparing method for high-throughput acid-resistant nanofiltration membrane

A nanofiltration membrane and high-flux technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low flux, achieve the effect of improving membrane flux, increasing flux, and simple film-forming process

Inactive Publication Date: 2017-11-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there are few research reports on acid-resistant nanofiltration membranes, and their fluxes are all small, such as the acid-stable membrane mentioned in patent CN105289305A, which obtains a flux of 1.7LMH at a pressure of 4.1bar, Kah P.Lee The flux of the acid-resistant nanofiltration membrane mentioned in the article published by Journal of Membrane Science in 2015 is 2.0-3.0LMH / bar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 2.5g of polyethyleneimine with a molecular weight of 600, 5g of triethylamine, add deionized water to 500ml, fully disperse and stir for 24 hours; weigh 1.5g of cyanuric chloride, dissolve it in 500ml of n-hexane alkane solvent, fully stirred for 24 hours; weighed 0.15g of sodium dodecylsulfonate solution, dissolved it in 500ml of deionized water, and fully stirred for 24 hours. Soak the polysulfone ultrafiltration membrane soaked in deionized water first in aqueous solution A for 5 minutes, then in aqueous solution B for 5 minutes, and finally in aqueous solution A for 5 minutes, take it out and dry it in the air. Immerse it in the oil phase solution at 30°C for 2 minutes, wash it with n-hexane solution, and then clean it with deionized water, heat it at 60°C and 100°C successively, and measure its flux, which is 3.2 LMH / bar.

Embodiment 2

[0024] Weigh 2.5g of polyethyleneimine with a molecular weight of 600, 0.01g of aminated graphene, and 5g of triethylamine, add deionized water to 500ml, fully disperse and stir it for 24 hours; weigh 1.5g of cyanuric chloride, Dissolve it in 500ml of n-hexane solvent and stir it fully for 24 hours; weigh 0.15g of sodium dodecylbenzenesulfonate solution, dissolve it in 500ml of deionized water, and stir it fully for 24 hours. Soak the polyethersulfone ultrafiltration membrane soaked in deionized water first in aqueous solution A for 5 minutes, then in aqueous solution B for 10 minutes, and finally in aqueous solution A for 5 minutes, take it out and dry it , immerse it in the oil phase solution at 30°C for 2 minutes, wash it with n-hexane solution, and then clean it with deionized water, heat it at 60°C and 100°C successively, and measure its flux. The nanofiltration membrane without graphene increased the flux by 40%.

Embodiment 3

[0026] Take by weighing 2.5g molecular weight polyvinylamine of 1800, 0.05g aminated graphene, 2g triethylamine, add deionized water to 500ml, fully disperse and stir it for 24 hours; take by weighing 1.5g cyanuric chloride, It was dissolved in 500ml of n-hexane solvent, fully stirred for 24 hours; 0.25g of sodium dodecylsulfonate solution was weighed, dissolved in 500ml of deionized water, and fully stirred for 24 hours. Soak the polysulfone ultrafiltration membrane soaked in deionized water in water phase solution A for 10 minutes, then immerse it in water phase solution B for 5 minutes, and finally immerse it in water phase solution A for 5 minutes, dry it in the air, Immerse it in the oil phase solution at 30°C for 30s, wash it with toluene solution, and then clean it with deionized water, heat it at 60°C and 100°C successively, and measure its flux. The nanofiltration membrane improves the flux by 80%.

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Abstract

The invention discloses a preparing method for a high-throughput acid-resistant nanofiltration membrane, and belongs to the technical field of membrane preparing. The preparing method includes the steps that polyethyleneimine, aminated graphene and an acid-binding agent are sequentially added into deionized water, and a water-phase solution A is prepared; a surfactant is added into deionized water, and a water-phase solution B is prepared; cyanuric chloride is dissolved into an organic solvent, and an oil-phase solution is prepared; an ultrafiltration basement membrane is in contact with the water-phase solution A and then is in contact with the water-phase solution B, and then is in contact with the water-phase solution A and reacted, redundant solutions are removed, then the product is in contact with the oil-phase solution and is reacted with the oil-phase solution for a period, the product is washed with deionized water, heat treatment is carried out, then the product is preserved with deionized water, and the acid-resistant nanofiltration membrane with the improved throughput is obtained. The nanofiltration membrane prepared with the method has the advantages of being high in throughput and good in salt rejection effect, operation is easy, industrialization is easy to achieve, and the preparing method has broad application prospects.

Description

technical field [0001] The invention relates to a preparation method of a high-flux nanofiltration membrane, in particular to a preparation method of a high-flux acid-resistant nanofiltration membrane, and belongs to the technical field of membrane preparation. Background technique [0002] Nanofiltration is a membrane separation technology that has emerged in recent years. Due to its own characteristics, it has a high removal effect on organic matter with a molecular weight between 200 and 1000 Da, and can retain some ions that are beneficial to the human body. At present, nanofiltration has been widely used in water purification, industrial wastewater treatment and other fields. Among them, nanofiltration technology is widely used in strong acid environment, such as strong acid to be treated liquid (industrial acid extraction waste liquid, acid cleaning liquid, electroplating industry Heavy metal recovery, acid recovery, biomass separation and water purification in acid-co...

Claims

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Application Information

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IPC IPC(8): B01D71/00B01D69/02B01D67/00B01D61/00
CPCB01D61/027B01D67/0079B01D69/02B01D71/00B01D2325/30B01D2325/36
Inventor 赵长伟俞灵王军侯得印曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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