Preparation method of ultra-low-pressure and high-flux metal-organic nano particle assembly nanofiltration membrane

A nanoparticle assembly, metal-organic technology, applied in nanotechnology, chemical instruments and methods, membranes, etc., can solve the problem of poor stability of the separation layer and support layer, increase the frequency of membrane cleaning and replacement, and reduce membrane permeability selectivity, etc. problem, achieve good industrial application prospects, simple method, easy to control the effect

Active Publication Date: 2019-04-12
ZHEJIANG UNIV OF TECH
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Problems solved by technology

When nanocomposite membranes are dealing with special feed-liquid systems, the poor stability of the separation layer and the support layer, or the interlayer peeling caused by weak interfacial forces, and the fouling and clogging of the membrane will all lead to the permeation selectivity of the membrane. Reduce, increase the frequency of membrane cleaning and replacement, and increase operating costs

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  • Preparation method of ultra-low-pressure and high-flux metal-organic nano particle assembly nanofiltration membrane

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preparation example Construction

[0014] A method for preparing a nanofiltration membrane assembled with ultra-low pressure and high flux metal-organic nanoparticles, comprising the following steps:

[0015] (1) Dissolving 0.1 to 3 parts by mass of polyamine molecules, 0.1 to 1 parts by mass of metal salts and 0.05 to 0.25 parts by mass of dopamine in 100 parts by mass of an alkaline aqueous solution, and passing oxygen into it for oxidative polymerization, Obtain an aqueous dispersion of organic nanoparticle seeds loaded with metal ions;

[0016] (2) Immerse the porous support membrane in the above-mentioned aqueous dispersion of nanoparticle seeds at 15 to 25°C for 10 to 60 minutes, take out and remove the excess aqueous dispersion on the surface of the membrane, self-assemble the nanoparticles into a membrane, and then use organic The ligand solution is impregnated, and the nanoparticles grow in situ to form a nascent film assembled by metal-organic nanoparticles;

[0017] (3) Interfacially cross-link the ...

Embodiment 1

[0021] Get 0.1g piperazine, 0.1g zinc nitrate and 0.05g dopamine and dissolve in 100g mass percentage concentration and be 0.01wt% sodium hydroxide aqueous solution, feed oxygen, polymerize at 15 ℃ for 8 hours, obtain the organic nanoparticle of loading zinc ion Seed water dispersion, immerse the polysulfone ultrafiltration membrane in the above water dispersion at 15°C for 60 minutes, take out and remove the excess water dispersion on the surface of the membrane, the nanoparticle seeds self-assemble into a film, and then use the mass percentage concentration of 0.2% 2-methylimidazole methanol solution was soaked at 25°C for 0.5 hour, and the nanoparticles grew in situ to form a nascent film assembled by metal-organic nanoparticles. The interfacial crosslinking reaction was carried out at 15° C. for 10 minutes in n-hexane trimelliticoyl chloride solution, solidified at 45° C. for 30 minutes, and washed with deionized water to obtain a nanofiltration membrane assembled with meta...

Embodiment 2

[0024] Take 1g of m-phenylenediamine, 1g of zinc nitrate and 0.25g of dopamine and dissolve them in 100g of a mass percent concentration of 0.1wt% sodium hydroxide aqueous solution, feed oxygen, and polymerize at 25°C for 0.5 hours to obtain organic nanoparticles loaded with zinc ions Seed water dispersion, immerse the polysulfone ultrafiltration membrane in the above water dispersion at 25°C for 10 minutes, take out and remove the excess water dispersion on the surface of the membrane, the nanoparticle seeds self-assemble into a film, and then use the mass percentage concentration of 4% 2-methylimidazole methanol solution was immersed at 15°C for 6 hours, and the nanoparticles grew in situ to form a nascent film assembled by metal-organic nanoparticles. In the benzenetricarboxylic acid chloride n-hexane solution, the interfacial crosslinking reaction was carried out at 25° C. for 1 minute, solidified at 65° C. for 10 minutes, and washed with deionized water to obtain a nanofil...

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Abstract

The invention discloses a preparation method of an ultra-low-pressure and high-flux metal-organic nano particle assembly nanofiltration membrane. Polyamine molecules and polyoxometalates serve as rawmaterials, dopamine serves as a biomimetic adhesive, and organic nano particle seeds loaded with metal ions are generated in a water solution through oxidation polymerization; the surface of a poroussupport membrane is coated with an aqueous dispersion of the nano particle seeds, and a membrane is formed through assembly; the membrane is soaked with an organic ligand solution, metal-organic nanoparticles are formed on the surface of the membrane, and finally, through interface crosslinking, the high-permselectivity and high-stability metal-organic nano particle assembly nanofiltration membrane is obtained. The metal-organic nano particle assembly nanofiltration membrane prepared by using the preparation method has the advantages that the structure and the characteristics of the membranecan be controlled, the operation pressure is low, the water flux is high, the separation selectivity is high, and the preparation method is simple and suitable for industrialized application.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a method for preparing a nanofiltration membrane assembled with ultra-low pressure and high flux metal-organic nanoparticles. Background technique [0002] With the rapid development of modern industry and the rapid increase of population, the problems of energy shortage and environmental pollution have become increasingly prominent. Promoting energy conservation and emission reduction and developing a low-carbon economy have become the main theme of social development. Membrane separation industry is known as one of the industries with the "most potential for development". As a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, nanofiltration has the advantages of low operating pressure, no chemical reaction, no phase change, and high separation efficiency. It has become one of the hot spots in the research and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B82Y40/00C02F1/44C02F101/30C02F101/36C02F101/38
CPCB01D61/027B01D67/0079B01D69/125B01D2323/30B01D2323/46B82Y40/00C02F1/44C02F2101/308C02F2101/36C02F2101/38C02F2101/40
Inventor 计艳丽顾冰心高从堦
Owner ZHEJIANG UNIV OF TECH
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