Preparation method of polydopamine modified imidazolyl nano particle composite nanofiltration membrane

A composite nanofiltration membrane and nanoparticle technology, applied in the field of membrane separation, can solve the problems of limited scale production and application, difficult control of membrane structure and performance, complex synthesis and dispersion stability methods, etc., and achieve good pollution resistance, The effect of performance optimization and good stability

Active Publication Date: 2020-11-13
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis and dispersion stability of inorganic nanomaterials and the method of directly constructing films using them as nano-units are relatively complicated, and the structure and properties of the obtained films are not easy to control, which greatly limits their large-scale production and application.

Method used

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  • Preparation method of polydopamine modified imidazolyl nano particle composite nanofiltration membrane
  • Preparation method of polydopamine modified imidazolyl nano particle composite nanofiltration membrane

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preparation example Construction

[0023] The preparation method of the polydopamine-modified imidazole-based nanoparticle composite nanofiltration membrane described in this embodiment comprises the following steps:

[0024] 1) Dissolve 0.02-0.5 parts by mass of aromatic polyamine monomer molecules in 100 parts by mass of acidic aqueous solution, and then add 0.02-0.2 parts by mass of aldehyde compounds and 0.2-0.6 parts by mass of dicarbonyl compounds to the above-mentioned Mix evenly in an acidic aqueous solution, polycondense at 60-120°C for 1-72 hours, centrifuge, wash with deionized water, and freeze-dry to obtain imidazole-based nanoparticle powder;

[0025] 2) Dispersing 0.01 to 0.5 parts by mass of imidazole-based nanoparticles in 100 parts by mass of an alkaline aqueous solution, then adding 0.005 to 1.0 parts by mass of dopamine, and passing oxygen into it for oxidative polymerization to obtain polydopamine-modified imidazole-based nanoparticles aqueous dispersion;

[0026] 3) Dip-coat the surface o...

Embodiment 1

[0028]0.02g 2,4,6-tris(4-aminophenyl)-1,3,5-triazine was dissolved in 100g mass percent concentration of 10% glacial acetic acid aqueous solution, then 0.02g formaldehyde and 0.2g acetone The aldehyde was added to the above-mentioned glacial acetic acid aqueous solution and mixed evenly, polycondensed at 60°C for 72 hours, centrifuged at 5000 rpm for 40 minutes, washed with deionized water, and freeze-dried to obtain imidazole-based nanoparticle powder; then 0.01g The above-mentioned organic nanoparticles are dispersed in 100 g of an aqueous sodium hydroxide solution with a concentration of 0.001% by mass, 0.005 g of dopamine is added, and oxygen is passed through to oxidize and polymerize at 15° C. for 24 hours to obtain an aqueous dispersion of polydopamine-modified imidazole-based nanoparticles;

[0029] Dip-coat the surface of the polysulfone ultrafiltration membrane in the aqueous dispersion of the above-mentioned polydopamine-modified imidazole-based nanoparticles for 0.5...

Embodiment 2

[0032] 0.5g 2,4,6-tris(4-aminophenyl)-1,3,5-triazine was dissolved in 100g mass percent concentration of 50% glacial acetic acid aqueous solution, then 0.2g formaldehyde and 0.6g acetone The aldehyde was added to the above-mentioned glacial acetic acid aqueous solution and mixed evenly, polycondensed at 120°C for 1 hour, centrifuged at 8000 rpm for 20 minutes, washed with deionized water, and freeze-dried to obtain imidazole-based nanoparticle powder; then 0.5g The above-mentioned organic nanoparticles were dispersed in 100 g of an aqueous sodium hydroxide solution with a concentration of 0.01% by mass, 1.0 g of dopamine was added, oxygen was passed through and oxidatively polymerized at 35° C. for 1 hour to obtain an aqueous dispersion of polydopamine-modified imidazole-based nanoparticles;

[0033] The surface of the polysulfone ultrafiltration membrane was dip-coated in the aqueous dispersion of the above-mentioned polydopamine-modified imidazole-based nanoparticles for 4 ho...

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Abstract

The invention discloses a preparation method of a polydopamine modified imidazolyl nano particle composite nanofiltration membrane. The preparation method comprises the following steps: taking aromatic polyamine monomer molecules, an aldehyde compound and a dicarbonyl compound as reaction raw materials, carrying out polycondensation in an acidic aqueous solution to form imidazolyl nano particles,adding dopamine into an alkaline aqueous dispersion of the imidazolyl nano particles, carrying out oxidative polymerization to obtain polydopamine-modified imidazolyl nano particles, and finally, preparing the composite nanofiltration membrane on a porous ultrafiltration membrane by virtue of a surface coating-interface crosslinking method. The prepared polydopamine modified imidazolyl nano particle composite nanofiltration membrane has high permeation selectivity and strong anti-pollution stability, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a preparation method of a polydopamine-modified imidazole-based nanoparticle composite nanofiltration membrane. Background technique [0002] With the acceleration of the industrialization process of human society and the rapid increase in population, problems such as environmental pollution and water shortage have become increasingly prominent. As a new separation technology with high efficiency, environmental protection and energy saving, membrane separation has been more and more widely used in the fields of water purification, wastewater treatment, chemical separation, and resource material recycling. 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D61/02B01D61/14B01D65/10C02F1/44C02F101/34C02F101/38
CPCB01D69/12B01D61/027B01D69/125B01D61/145B01D65/102C02F1/444C02F1/442C02F2101/38C02F2101/40C02F2101/34
Inventor 计艳丽刘壮壮叶润峰高从堦
Owner ZHEJIANG UNIV OF TECH
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