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A method for preparing loose nanofiltration membranes based on interfacial polymerization

A technology of interfacial polymerization and nanofiltration membranes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve membrane wetting and other problems, and achieve the effects of improving permeability, stability and high retention

Active Publication Date: 2020-08-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a method for preparing a new type of loose nanofiltration membrane based on interfacial polymerization, which overcomes the problem of membrane wetting encountered in the application process of the composite nanofiltration membrane in the prior art

Method used

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  • A method for preparing loose nanofiltration membranes based on interfacial polymerization
  • A method for preparing loose nanofiltration membranes based on interfacial polymerization
  • A method for preparing loose nanofiltration membranes based on interfacial polymerization

Examples

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Effect test

Embodiment 1

[0027] Take 12.9ml polyethylene glycol-400 and add it to 85ml N-methylpyrrolidone, make it mix well. Then add 19g of PVDF to the above solution while stirring, stir for 10 hours in a water bath at a constant temperature of 60°C to dissolve the polymer completely, and leave it at room temperature for 12 hours to obtain a homogeneous casting solution after defoaming; scrape the casting solution with a scraper Prepare a flat support film on a clean glass plate, stay in the air for 30s, then place the scraped flat support film in a deionized water coagulation bath until it solidifies into a PVDF flat support film; soak the film in deionized water for 24h, during Constantly replace the deionized water to completely remove the residual solvent in the membrane. Weigh 2g of piperazine and dissolve it in 100ml of deionized water to prepare a water-phase monomer, then disperse 0.1g of nanometer silicon dioxide into the above-mentioned water-phase monomer solution, and sonicate for 30min...

Embodiment 2

[0030] Take 10.2ml polyethylene glycol-600 and add it to 165ml N,N-dimethylformamide, make it mix well. Then add 40g of PSF into the above solution while stirring, stir for 12 hours in a water bath at a constant temperature of 70°C to dissolve completely, and let stand at room temperature for 12 hours to obtain a uniform casting solution after defoaming; use a spatula to cast PSF into a film Prepare a flat support film on a clean PTFE plate with liquid scraping, stay in the air for 10s, and then place the scraped flat support film in a deionized water coagulation bath until it solidifies into a PSF flat support film; put the film in deionized water Soak for 24 hours, during which the deionized water was constantly replaced to completely remove the residual solvent in the membrane. Weigh 1.5g of m-phenylenediamine and dissolve it in 100ml of deionized water to obtain a water phase monomer, then disperse 0.05g of graphene oxide nanosheets into the above water phase monomer solut...

Embodiment 3

[0033] Take 5g of polyvinylpyrrolidone and dissolve it in 81ml of N,N-dimethylacetamide, after it is completely dissolved, add 10g of PES into the above solution while stirring, and stir for 10 hours at a water bath temperature of 80°C to make it completely dissolve , standing at room temperature for 12 hours to obtain a uniform casting solution; use a scraper to scrape the PES casting solution on a clean PTFE plate to prepare a flat support film, stay in the air for 30s, and then scrape the scraped flat support film Place it in a deionized water coagulation bath until it solidifies into a PES flat support membrane; soak the membrane in deionized water for 24 hours, and constantly replace the deionized water during this period to completely remove the residual solvent in the membrane. Weigh 0.025g of p-phenylenediamine and dissolve it in 100ml of deionized water to prepare a water phase monomer, then disperse 5g of montmorillonite nanoparticles into the above water phase monome...

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Abstract

The invention discloses a method for preparing a loose nanofiltration membrane based on interfacial polymerization. The method comprises the following steps: preparing a polymer casting solution, dispersing nanoparticles in an aqueous phase monomer and an oil phase monomer, and preparing a flat plate support membrane; immersing the flat plate support membrane in the water phase monomer, then pouring the oil phase monomer into the aqueous phase monomer, and loading a nano membrane onto the surface of the flat plate support membrane after the two phase monomers are subjected to an interfacial polymerization reaction. The composite nanofiltration membrane prepared by the method has a loose structure on the surface; nano materials are embedded into a polyamide nano thin layer during the interfacial polymerization reaction; on the one hand, the hydrophilicity of the surface of the membrane can be improved; on the other hand, in the process of polycondensation, polyamide is simultaneously grown around the materials in the direction perpendicular to the nano materials to form such a sandwich structure; upper and lower polyamide layers can protect the nano materials from being damaged under high operating pressure; the structure of the polyamide nano membrane is regulated; meanwhile, the structural stability, permeability and retention property of the nanofiltration membrane are improved.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a method for preparing loose nanofiltration membranes based on interfacial polymerization. Background technique [0002] The research on nanofiltration membranes can be traced back to the late 1980s, developed rapidly in the 1990s, and began industrial application in the early 21st century. Nanofiltration membrane has the advantages of high efficiency, safety and environmental protection, low operating pressure, low operating cost, high recovery rate, and no regeneration pollution. It can remove impurities such as hardness, chroma, small molecular organic matter, and particulate pollutants in water. Pharmaceutical industry, food industry, fuel chemical industry and auxiliary industry, environmental protection industry, biotechnology industry and other water treatment fields are widely used, such as desalination and concentration, starch sugar purification and concentration, ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D69/10B01D69/12B01D67/00
CPCB01D61/027B01D67/0011B01D67/0079B01D69/02B01D69/10B01D69/125B01D2325/36
Inventor 李淼吴晓娜刘翔
Owner TSINGHUA UNIV
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