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Intelligent membrane based on supermolecule and preparation method thereof

A smart membrane, supramolecular technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc.

Active Publication Date: 2015-12-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the preparation and application of supramolecular structures for smart membranes has not been reported.

Method used

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  • Intelligent membrane based on supermolecule and preparation method thereof
  • Intelligent membrane based on supermolecule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Weigh 7.5g of EVAL, dissolve it in 30g of dimethyl sulfoxide solvent, add 7.5g of octanol, and fully stir at 60°C for 6h to obtain a homogeneous and transparent casting solution. After vacuum or static defoaming, pour the casting solution on a glass plate and scrape it with a scraper to form a film. Then put the glass plate with the casting solution into pure water at 25°C, and immerse the ethylene-vinyl alcohol copolymer film prepared by the immersion precipitation phase inversion method in pure water for two days, take it out and dry it for later use. The obtained film thickness was 130 μm.

[0021] (2) Immerse the EVAL film obtained in step (1) into the acetone solution of benzophenone with a concentration of 0.1g / L, and place the EVAL film coated with benzophenone on the quartz glass plate after 2h During this time, use a dropper to absorb an appropriate amount of N,N-dimethylaminoethyl methacrylate and evenly drop it on the surface of the film, then sandwich i...

Embodiment 2

[0025] (1) Weigh 5g of polysulfone into a 500mL round bottom flask, add 180mL of chloroform at the same time, and stir until the polysulfone is completely dissolved. Then add 4.2mL of paraformaldehyde, 17.5mL of trimethylchlorosilane, and 0.2mL of tin tetrachloride, mix well, raise the temperature to 50°C, and react for 40h under magnetic stirring. After the reaction is completed, the obtained solution is concentrated by rotary evaporation and precipitated in absolute ethanol, washed and then vacuum-dried for future use. The obtained product is chloromethylated polysulfone (CMPSf).

[0026] Put CMPSf, polyethylene glycol (molecular weight 400), and N-N dimethylacetamide into a three-necked flask at a mass ratio of 16:10:74, and heat and stir at 60°C until a homogeneous and transparent solution is obtained . After vacuum or static defoaming, pour the casting solution on the glass plate and scrape it with a scraper to form a film. Then put the glass plate with the casting solu...

Embodiment 3

[0031] (1) Weigh 10g of PVDF and dissolve it in 40g of DMAC solvent, stir well at 80°C for 6h to obtain a homogeneous and transparent casting solution. After vacuum or static defoaming, pour the casting solution on a glass plate and scrape it with a scraper to form a film. Then put the glass plate with the casting liquid into pure water at 25°C, and use the immersion precipitation phase inversion method to prepare the PVDF porous membrane. Soak it in pure water for two days, take it out and dry it for later use. The obtained film thickness was 150 μm.

[0032] (2) Place the film obtained in step (1) in a methanol solution of 1 g / L benzophenone and let it stand for 1 h to allow the benzophenone to fully react on the surface of the film, then take out the film and dry it at room temperature for 1 h , so that the benzophenone monomer is attached to the surface of the PVDF membrane, the PVDF membrane is put into the ultraviolet irradiation device, pre-irradiated for 10 minutes, ...

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Abstract

The invention provides an intelligent membrane comprising a supramolecular structure and polymer materials and a preparation method of the intelligent membrane. The intelligent membrane comprises a basilemma of which the surface has a polycation graft chain, and a supramolecular structure of porphyrin, wherein the basilemma is obtained by the membrane surface grafting modification, and can interact with the porphyrin to realize porphyrin load and the supramolecular structure. When the pH of material liquid is less than 1.2, the porphyrin forms a J-aggregated supramolecular structure, the water flux of the membrane is smaller, and reject rate is high; when the pH of the material liquid is greater than 4.0, the porphyrin forms an H-aggregated supramolecular structure, the water flux of the membrane is greater, and reject rate is low. When the pH of the material liquid gradually changes from the pH less than1.2 to the pH greater than 4.0, the J-aggregated supramolecular structure is gradually transformed into the H-aggregated supramolecular structure, the water flux of the membrane is increased, the reject rate is lowered, the process is reversible, and the intelligent membrane has pH-responsiveness. The intelligent membrane and the preparation method thereof can be applied to the relevant fields of separation and purification, water treatment, chemical sensors and the like.

Description

technical field [0001] The invention relates to an intelligent membrane material, in particular to an intelligent membrane composed of a supramolecular structure and a polymer material and a preparation method thereof. It can be applied to related fields such as separation and purification, water treatment, chemical sensor and the like. Background technique [0002] Membrane technology is an efficient fluid separation technology, which plays an increasingly important role in energy saving, clean production and circular economy. In membrane separation, membrane materials occupy a very important position. Different from traditional separation membranes, smart membranes contain groups or segments that respond reversibly to environmental stimuli, so that the structure of the membrane reversibly changes with these stimuli, resulting in changes in membrane properties such as pore size, hydrophilicity / hydrophobicity, etc. Change, thereby controlling the flux of the membrane and i...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00
Inventor 赵莉芝张玉忠刘满满
Owner TIANJIN POLYTECHNIC UNIV
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