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Preparation method of composite membrane for efficiently filtering micro-pollutants in water

A high-efficiency filtration and composite membrane technology, applied in the direction of water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of reducing adsorption effect and easy loss, and achieve simple preparation process, low cost and high application value Effect

Active Publication Date: 2019-01-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because β-cyclodextrin is a hydrophilic small molecular substance, which is easily lost during the process of film formation as an additive, greatly reducing the adsorption effect

Method used

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  • Preparation method of composite membrane for efficiently filtering micro-pollutants in water
  • Preparation method of composite membrane for efficiently filtering micro-pollutants in water
  • Preparation method of composite membrane for efficiently filtering micro-pollutants in water

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preparation example Construction

[0020] A method for preparing a composite membrane for efficiently filtering micro-pollutants in water, comprising the steps of:

[0021] (1) Mix the film-forming polymer, functionalized β-cyclodextrin, porogen, cross-linking agent and solvent according to a certain mass ratio, dissolve it by mechanical stirring at 40-100°C, react for 5-10 hours and vacuumize After defoaming, the casting solution is obtained. The mass ratio of each component is as follows: 10-30% for film-forming polymer; 1-10% for functionalized β-cyclodextrin; 10-20% for porogen; 0.5-5% for cross-linking agent; 35-78.5%;

[0022] (2) The film casting solution is coated by a film scraping machine or extruded from a hollow fiber spinneret, immersed in a coagulation bath to solidify and form, and form a polymer primary film;

[0023] (3) The polymer primary membrane is thoroughly washed in deionized water to obtain a composite membrane, which is used for adsorption and removal of micro-pollutants in water.

...

Embodiment 1

[0036] Mix the polyvinylidene fluoride, amino β-cyclodextrin, polyethylene glycol, polyethyleneimine and N,N-dimethylacetamide according to the concentration requirements of the corresponding numbers in Table 1.1, stir mechanically for 5 hours, and fully After dissolving, defoam and filter to obtain the casting solution, and let it stand for 30 minutes. The film casting liquid is coated by a film scraping machine, immersed in a coagulation bath mixed with pure water and N,N-dimethylacetamide to solidify and form, and washed with water at 25°C to obtain a sheet-shaped composite film, which is further fully cleaned with deionized water. Then stand and dry in the air to obtain a composite membrane with a pore diameter of 10 nm. Test its water flux, BSA rejection rate. The adsorption properties of organic micro-pollutants bisphenol A (BPA) and dinaphthol (2-NO) were tested.

[0037] Table 1.1: Preparation conditions of polyvinylidene fluoride / amino β-cyclodextrin composite membr...

Embodiment 2

[0043] Mix polyvinyl chloride, carboxyl β-cyclodextrin, polyvinylpyrrolidone, glutaraldehyde and N,N-dimethylformamide according to the concentration requirements of the corresponding numbers in Table 2.1, and stir mechanically for 6 hours. After fully dissolving, After defoaming and filtering, the casting solution was obtained and left to stand for 30 minutes. Extrude the casting liquid through the hollow fiber spinneret, immerse it into a coagulation bath mixed with pure water and N,N-dimethylformamide to solidify and form it, wash it with water at 25°C to obtain a hollow fiber composite membrane, and further use deionized Wash thoroughly with water, and then let it dry in the air to obtain a composite membrane with a pore size of 1 μm. Test its water flux, E. coli retention rate. The adsorption properties of organic micropollutant dichlorophenol (2,4-DCP) and plasticizer 4,4'-dihydroxydiphenylsulfone (BPS) were tested.

[0044] Table 2.1: Preparation conditions of polyvin...

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Abstract

The invention discloses a preparation method of a composite membrane for efficiently filtering micro-pollutants in water. The preparation method comprises: dissolving functionalized beta-cyclodextrinas a film forming additive, a film forming polymer, a pore forming agent and a cross-linking agent in a solvent according to a set ratio to prepare a film casting solution, and preparing the compositemembrane capable of efficiently filtering organic micro-pollutants by using an immersion precipitation phase transformation method through the moderate in-situ cross-linking of the functionalized beta-cyclodextrin in the film casting solution. According to the present invention, the composite membrane maintains the high water permeability, has the high removal rate on micro-contaminants in water,can remove planktons, algae, bacteria, proteins, colloids, viruses and other pollutants through filtering, and can remove antibiotics, hormones, plasticizers and other organic small molecule micro-pollutants through adsorption; the preparation process is simple, controllable and low in cost; and the composite membrane can be widely used in household water purification, sewage treatment, water purification and other separation fields, is the efficient and stable water treatment material, and has wide application value.

Description

technical field [0001] The invention relates to a method for preparing a composite membrane for efficiently filtering micro-pollutants in water, relates to adsorption and membrane separation technology, and belongs to the field of functional membrane materials. Background technique [0002] In recent years, human water quality has improved. With the development of economy and the acceleration of modernization, human material and cultural levels have been significantly improved, and the fineness of life has also been improved. People's requirements for water quality are also getting higher and higher, including drinking water. and domestic water. Therefore, the requirements for water treatment have also increased significantly, and water treatment technology needs to be improved urgently. At present, water treatment technologies mainly include flocculation sedimentation method, membrane separation method, centrifugal separation method and so on. The flocculation-sedimentati...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D67/00C02F1/44C02F1/28C02F101/30
CPCB01D67/0009B01D69/02B01D69/125B01D2325/12B01D2325/36C02F1/286C02F1/44C02F2101/30
Inventor 朱利平张斌方传杰王章慧徐又一
Owner ZHEJIANG UNIV
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