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Preparation method of nanofiltration membrane assembled with ultra-low pressure and high flux metal-organic nanoparticles

A nanoparticle assembly, metal-organic technology, applied in nanotechnology, chemical instruments and methods, membranes, etc., can solve problems such as increasing the frequency of membrane cleaning and replacement, increasing operating costs, and membrane fouling and clogging

Active Publication Date: 2021-10-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Preparation method of nanofiltration membrane assembled with ultra-low pressure and high flux metal-organic nanoparticles

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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 method for preparing a nanofiltration membrane assembled with ultra-low pressure and high flux metal-organic nanoparticles. Polyamine molecules and metal salts are used as raw materials, and dopamine is used as a bionic binder, and are oxidized and polymerized in an aqueous solution to form loaded metal ions. The above organic nanoparticle seeds are coated with the above nanoparticle seed aqueous dispersion on the surface of the porous support membrane and assembled into a membrane, and then impregnated with an organic ligand solution to form metal-organic nanoparticles on the membrane surface, and finally crosslinked through the interface , to obtain metal-organic nanoparticle-assembled nanofiltration membranes with high permeability selectivity and good stability. The prepared metal-organic nanoparticle-assembled nanofiltration membrane has the characteristics of controllable membrane structure and performance, low operating pressure, high water flux, good separation selectivity, simple preparation method, suitable for industrial application and the like.

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 Patents(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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