Nanofiltration membrane material with multi-scale surface structure and its preparation method and application

A surface structure and multi-scale technology, applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor anti-fouling effect of nanofiltration membranes, influence of nanofiltration membrane performance, and reduction of roughness, etc., to achieve design and Strong operability, removal of surface pollutants, and improvement of anti-fouling effects

Active Publication Date: 2022-04-26
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-ionic hydrophilic polymer containing ether bonds in the main chain is embedded in the polyamide layer through secondary interfacial polymerization, and the surface of the modified membrane is smooth and the roughness is reduced. Although the nanofiltration membrane prepared by the above method can improve Fouling resistance of the membrane, but the introduction of non-ionic hydrophilic groups will significantly reduce the number of residual carboxyl groups on the surface, so the hydrophilicity of the membrane is reduced, and the performance of the nanofiltration membrane is affected
[0006] English literature (Nature Communications 2018, 9:2004) reported a novel TFC nanofiltration membrane design method, which preloaded nanoparticles as sacrificial template materials onto the supported porous membrane through a nanostructure-mediated interfacial polymerization process. , these preloaded nanoparticles will form rough and irregular nanostructures on the surface of the support film, so interfacial polymerization occurs on the rough surface with nanoscale roughness, and the nanoparticles are hydrolyzed after polymerization to form a thin The nanoscale shrinkage structure PA active layer, although this fold structure is conducive to improving the flux of the nanofiltration membrane, but the nanofiltration membrane prepared by this method has poor antifouling effect to a certain extent

Method used

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  • Nanofiltration membrane material with multi-scale surface structure and its preparation method and application
  • Nanofiltration membrane material with multi-scale surface structure and its preparation method and application
  • Nanofiltration membrane material with multi-scale surface structure and its preparation method and application

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preparation example Construction

[0039] The present invention also provides a method for preparing a nanofiltration membrane material with a multi-scale surface structure, comprising the following steps:

[0040] S1. Dispersing the polymer nanofibers in a mixed solvent of an organic solvent and deionized water to obtain a nanofiber suspension, which is sealed and stored for later use;

[0041] S2. Applying the nanofiber suspension obtained in step S1 to the surface of the fabric substrate by using wet non-woven technology, and drying at room temperature to obtain a nanofiber coating film with a surface periodic texture structure;

[0042] S3. Dissolving a predetermined amount of piperazine and triethylamine in water to prepare an aqueous phase solution; dissolving trimesoyl chloride in n-hexane to prepare an oil phase solution; then coating the nanofibers obtained in step S2 The membrane is successively immersed in the water phase solution and the oil phase solution to carry out interfacial polymerization rea...

Embodiment 1

[0049] This embodiment provides a nanofiltration membrane material with a multi-scale surface structure and a preparation method thereof.

[0050] The nanofiltration membrane material is composed of a nanofiber coating membrane with periodic twill and a polypiperazine amide nanofiltration separation layer loaded on the surface of the nanofiber coating membrane; the nanofiber coating membrane is composed of a fabric whose surface periodic texture structure is twill The substrate and the ethylene vinyl alcohol copolymer nanofiber coating loaded on the surface of the fabric substrate and wrapped and covered by the polypiperazine amide nanofiltration separation layer.

[0051] Specifically, the preparation method of the nanofiltration membrane material comprises the following steps:

[0052] S1. Disperse the ethylene vinyl alcohol copolymer nanofibers prepared by electrospinning in a mixed solvent with a mass ratio of ethanol and deionized water of 1:1, and stir to form nanofiber ...

Embodiment 2～6 and comparative example 1

[0059] Embodiments 2 to 6 respectively provide a method for preparing a nanofiltration membrane material with a multi-scale surface structure. Compared with Example 1, the difference is that the texture and nanofibers of the woven fabric used in step S2 are changed. The coating thickness and coating density of the suspension, and the rest of the steps are the same as in Example 1, and will not be repeated here.

[0060] Comparative example 1 then provides a kind of preparation method of nanofiltration membrane material, compared with embodiment 1, difference is that the woven fabric used in step S2 is changed into non-woven fabric, all the other steps are consistent with embodiment 1 , which will not be repeated here.

[0061] In order to compare the performance difference of the nanofiltration membrane material prepared by each embodiment and comparative example, the water permeability, Na 2 SO 4 The interception rate and flux recovery rate are tested, the precompression pr...

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Abstract

The invention provides a nanofiltration membrane material with a multi-scale surface structure, a preparation method and an application thereof. By using a woven fabric with a surface periodic texture as a substrate, and using a wet-laid non-woven technology to load a polymer nanofiber coating on the surface of the woven fabric, a nanofiber coating film with a surface periodic texture structure is formed; The polypiperazine amide nanofiltration separation layer is prepared by the polymerization method, and it is wrapped and covered with the polymer nanofiber coating, so that the polypiperazine amide nanofiltration separation layer has a surface periodic texture structure and a peak-valley structure at the same time, forming a multi-scale surface. Structured nanofiltration membrane materials. Through the above method, the present invention can endow the nanofiltration membrane material with a multi-scale surface structure, effectively improve its permeability and anti-fouling property, so that it can be applied to the nanofiltration field of tangential flow liquid; and the preparation of the nanofiltration membrane material The process is simple, highly controllable, easy for large-scale preparation, and can meet the needs of actual industrial production and application.

Description

technical field [0001] The invention relates to the technical field of membrane filtration, in particular to a nanofiltration membrane material with a multi-scale surface structure and a preparation method and application thereof. Background technique [0002] Due to rapid population and economic growth, water pollution and water scarcity have evolved into a global challenge. Among all existing desalination technologies, pressure-driven membrane-based technologies, such as reverse osmosis (RO) and nanofiltration (NF), are the most energy-efficient and technologically mature. Nanofiltration membranes can intercept polyvalent salts and organic molecules, and have the characteristics of low energy consumption and high flux, making them an ideal water treatment technology. Therefore, nanofiltration membranes can be widely used in the purification and softening of production and domestic water , Material recycling, treatment of domestic wastewater, industrial wastewater, etc. ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D69/00B01D61/02B01D69/12
CPCB01D69/00B01D61/027B01D69/12B01D2325/36B01D69/081
Inventor刘轲王栋马思琪刘念程盼胡威郭启浩程芹
OwnerWUHAN TEXTILE UNIV