A preparation method of doped inorganic/organic nanoparticle forward osmosis membrane

A technology of inorganic nanoparticles and forward osmosis membrane, applied in the field of osmosis membrane, can solve the problems of low membrane strength, low rejection rate and easy agglomeration

Active Publication Date: 2019-03-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The organic forward osmosis membrane produced by the existing method has poor hydrophilicity, large internal concentration polarization, small permeation flux, low rejection rate and poor antibacterial property, low strength of the membrane, and poor practical performance
[0005] Due to the high surface energy and large specific surface area of ​​inorganic nanoparticles, they are prone to agglomeration, which has an adverse effect on the structure and performance of the hybrid membrane, and the interaction between the organic and inorganic phases is weak. Inorganic nanoparticles are easy to lose, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0124] The present invention provides a kind of preparation method of described forward osmosis membrane, described method comprises the steps:

[0125] 1) providing a casting solution, which comprises a film-forming agent, inorganic / organic hybrid nanoparticles A-g-B and an organic solvent;

[0126] 2) Coating the casting solution on the substrate and curing it to obtain the forward osmosis membrane.

[0127] In the present invention, the organic solvent is not particularly limited.

[0128] Representatively, the organic solvents include (but are not limited to): 1,4-dioxane, acetone, methanol, lactic acid, N-methylpyrrolidone, N,N-dimethylacetamide, polyethylene glycol Alcohol 400, triethyl phosphate, or combinations thereof.

[0129] In another preferred example, in step 1), the film-forming agent is first dissolved in the organic solvent, and then the inorganic / organic hybrid nanoparticles A-g-B are added to the film-forming agent-dissolved The casting solution is formu...

Embodiment 1

[0164] Embodiment 1 prepares forward osmosis membrane 1

[0165] Using triacetate cellulose as a polymer, 13.1% (V%) triacetate cellulose and 0.9% (V%) SiO 2 - g-PHEMA inorganic / organic hybrid nanoparticles added to a mixture consisting of 57.8% (V%) 1,4-dioxane, 19.6% (V%) acetone and 8.6% (V%) methanol In the solvent, stir at a temperature of 60°C for 9 hours to dissolve and form SiO with a content of 0.9% (V%) 2 - Casting solution of g-PHEMA. Let it stand for more than 24 hours to completely defoam, stir the casting solution evenly and apply it on the substrate after standing for defoaming, and use a scraper to scrape evenly on the substrate to form a bottom film layer. The bottom film layer on the substrate is left to stand in the air for 30 seconds, and then the bottom film layer is put into a gel bath (the composition of the gel bath is deionized water) to form a film with a dense skin layer through phase inversion gel, The membrane was heat-treated in a water bath at...

Embodiment 2

[0179] Embodiment 2 prepares forward osmosis membrane 2

[0180] Using cellulose diacetate as polymer, 12.2% (V%) cellulose diacetate and 0.8% (V%) poly(acrylamine hydrochloride)-graphene nanosheets were added to the 55.1% (V%) 1,4-dioxane, 20.6% (V%) of acetone, 7.2% (V%) of methanol and 4.2% (V%) of lactic acid mixed into a mixed solvent, stirred at a temperature of 70 ° C Dissolving in 24 hours to form a casting solution of 0.9% (V%) poly(allylamine hydrochloride)-graphene nanosheets.

[0181] Let it stand for more than 24 hours to completely defoam, ultrasonically disperse for 30 minutes, stir the casting solution evenly, after standing for defoaming, apply it on the substrate, and use a scraper to scrape evenly on the substrate to form a bottom film layer. The bottom film layer on the substrate is left to stand in the air for 15 seconds, then the bottom film layer is put into a gel bath to form a film with a dense skin layer through phase inversion gel, and the prepared ...

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Abstract

The present invention relates to a forward osmosis membrane doped with inorganic / organic hybrid nanoparticles A-g-B, and specifically discloses a method comprising: (i) a bottom film layer, and doped in the bottom film layer Inorganic / organic hybrid nanoparticles A-g-B; and (ii) an optional forward osmosis membrane for supporting the substrate of the bottom membrane layer. The forward osmosis membrane of the present invention has excellent properties such as good hydrophilicity, large permeation flux, high rejection rate, excellent antibacterial performance, high strength, good stability, and can effectively reduce internal concentration polarization.

Description

technical field [0001] The invention relates to the field of permeable membranes, in particular to a forward osmosis membrane doped with inorganic / organic hybrid nanoparticles A-g-B. Background technique [0002] FO (Forward Osmosis) technology is an osmosis-driven membrane process with low energy consumption, low pollution, high recovery, etc. It has realistic or potential application prospects in seawater desalination, wastewater treatment, energy generation, food processing, drug concentration, etc. . However, the lack of efficient FO membrane materials greatly restricts the development of FO technology. The membrane materials currently used in the FO process all have an asymmetric structure, consisting of a thin selective separation layer and a porous support layer. In the FO process, there are both external concentration polarization and internal concentration polarization, especially the internal concentration polarization. As a result, the actual water flux of the F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D69/10B01D71/68B01D71/16B01D69/12B01D67/00B01D61/00C02F1/44
Inventor 薛立新张安将赵秀兰盛建芳
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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