Renewable ultrathin multilayer composite forward osmosis membrane as well as preparation method and application thereof

A multi-layer composite, forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of prolonging the membrane production process, increasing the cost, poor affinity of amine monomer aqueous solution, etc., to shorten the membrane production process, increase the cost, and improve the water The effect of flux

Active Publication Date: 2021-06-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the affinity between the hydrophobic PE diaphragm and the aqueous solution of amine monomers polymerized by interfacial polymerization is very poor, and it is difficult to directly prepare the

Method used

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  • Renewable ultrathin multilayer composite forward osmosis membrane as well as preparation method and application thereof

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preparation example Construction

[0026] As another aspect of the technical solution of the present invention, it also relates to a preparation method of a renewable ultra-thin multi-layer composite forward osmosis membrane, which includes:

[0027] (1) Make the PE microporous membrane fully contact with the oil phase solution containing the acid chloride monomer first, and then fully contact with the water phase solution containing the amine monomer after drying, and make the acid chloride monomer and the amine monomer in the The surface of the PE microporous membrane is subjected to interfacial polymerization and heat treatment to generate a micro-crosslinked polyamide layer to obtain a micro-crosslinked polyamide layer / PE microporous membrane;

[0028] (2) Make the micro-crosslinked polyamide layer / PE microporous membrane obtained in step (1) fully contact with the mixed solution containing polyphenolic compounds and cage polysilsesquioxane (POSS for short), and react to form crosslinking Hydrogel superhydr...

Embodiment 1

[0068] (1) Immerse the PE microporous membrane in n-hexane solution with a concentration of 0.1g / L trimesoyl chloride, take it out after soaking for 0.5min, brush off the surface liquid, and immerse it in an aqueous solution with a concentration of 0.1g / L m-phenylenediamine , take it out after reacting for 0.5min, and heat treatment at 30°C for 1min to form a slightly cross-linked polyamide layer;

[0069] (2) Submerge the membrane prepared in step (1) in a mixed aqueous solution composed of 0.2g / L catechol and 0.2g / L POSS, take it out after 0.5h, and wash to obtain a superhydrophilic hybrid layer;

[0070] (3) Immerse the membrane prepared in step (2) in an aqueous solution of 0.01g / L ferric chloride, take it out after 0.5h, wash it, heat it in a microwave at 300°C for 10s, take it out, wash it, and obtain an adsorption catalytic functional layer, Obtain a renewable ultra-thin multi-layer composite forward osmosis membrane.

[0071] After testing, when the forward osmosis me...

Embodiment 2

[0073] (1) Immerse the PE microporous membrane in an acetone solution with a concentration of 50g / L terephthaloyl dichloride, take it out after soaking for 30 minutes, brush off the surface liquid, and immerse it in an aqueous solution with a concentration of 100g / L o-phenylenediamine, and react for 30 minutes After taking it out, heat treatment at 90°C for 30 minutes to form a slightly cross-linked polyamide layer;

[0074] (2) Submerge the membrane prepared in step (1) in a mixed aqueous solution composed of 10g / L dopamine and 10g / L POSS, take it out after 48h, and wash to obtain a superhydrophilic hybrid layer;

[0075] (3) Immerse the membrane prepared in step (2) in an aqueous solution of 10g / L cobalt chloride, take it out after 48 hours, wash it, heat it in microwave at 100°C for 600s, take it out, wash it, and obtain an adsorption catalytic functional layer, and obtain a renewable Ultra-thin multi-layer composite forward osmosis membrane.

[0076] After testing, when t...

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Abstract

The invention discloses a renewable ultrathin multilayer composite forward osmosis membrane as well as a preparation method and application thereof. The forward osmosis membrane comprises a PE microporous supporting layer, a micro-crosslinked polyamide layer, a super-hydrophilic hybrid layer and an adsorption catalysis functional layer. The preparation method comprises the following steps: performing interfacial polymerization reaction on an acyl chloride monomer and an amine monomer on the surface of a PE microporous membrane, performing heat treatment to generate a micro-crosslinked polyamide layer, reacting with a mixed solution containing a polyphenol compound and polyhedral oligomeric silsesquioxane to generate a super-hydrophilic hybrid layer, and fully contacting with a metal compound aqueous solution, and reducing metal irons through microwave heatingto generate the super-hydrophilic hybrid layer. The concentration polarization of the PE microporous support membrane is not obvious, the solute rejection rate of the micro-crosslinked polyamide layer is high, the water molecule permeation resistance of the super-hydrophilic hybrid layer is weak, the pollutant removal capacity of the adsorption catalysis functional layer is high, the high-performance and renewable forward osmosis membrane is obtained, and seawater desalination, sewage purification, pollutant catalytic degradation and the like can be achieved.

Description

technical field [0001] The invention relates to a forward osmosis membrane, in particular to a reproducible ultra-thin multilayer composite forward osmosis membrane and a preparation method thereof, as well as the application of the forward osmosis membrane, belonging to the technical field of membrane separation. Background technique [0002] Composite forward osmosis membranes are currently the most widely studied forward osmosis membranes, usually including classic ultrafiltration base membranes such as polysulfone (PSf) and polyethersulfone (PES) prepared by non-solvent-induced phase separation, polyethers prepared by interfacial polymerization, etc. Amide active layer. At present, the classic ultrafiltration basement membrane is usually thick (usually greater than 50 µm), low porosity (surface porosity is only 0.3 ~ 1.3%), membrane pores are curved (sponge-like pores at the top), and the inner concentration difference is extremely high. phenomenon is serious. Moreover...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D71/56B01D71/26B01D71/02B01D69/12B01D61/00C02F1/44
CPCB01D61/002B01D69/125B01D71/022B01D71/26B01D71/56B01D71/76B01D2325/36C02F1/445C02F2103/08Y02A20/131
Inventor 朱丽静曾志翔宋海明张文辉
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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