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Multifunctional load type nanometer multilayer composite membrane, and preparation method and application thereof

A nano-multi-layer, load-type technology, applied in the field of membrane separation, can solve the problems of low internal concentration polarized water flux, easy deposition on the membrane surface, and large bending degree of membrane pores, so as to improve the solute retention rate and permeability. The effect of fast passing rate and high porosity

Active Publication Date: 2021-06-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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. Severe liquefaction and low water flux
During the operation of the composite membrane, dyes, proteins and other substances in the water body are easy to deposit on the surface of the membrane, causing serious membrane pollution, which is difficult to remove

Method used

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  • Multifunctional load type nanometer multilayer composite membrane, and preparation method and application thereof

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preparation example Construction

[0025] As another aspect of the technical solution of the present invention, it also relates to a preparation method of a multifunctional supported nano-multilayer composite film, which includes:

[0026] (1) Applying the first mixed reaction system including polydimethylsiloxane prepolymer, curing agent, fluorocarbon material and first solvent to the surface of the substrate to obtain a super-hydrophobic rough substrate;

[0027] (2) reacting the second mixed reaction system comprising polymer resin, vinyl monomer, catechol compound, amine polymer and second solvent to obtain a uniform casting solution, and applying the uniform casting solution to On the superhydrophobic rough substrate obtained in step (1), a polymer microporous support layer is prepared;

[0028] (3) fully contacting the polymer microporous support layer obtained in step (2) with the acid chloride solution to react to form an aminated cross-linked transition layer to obtain an aminated cross-linked transiti...

Embodiment 1

[0083] Mix 2wt% polydimethylsiloxane (PDMS) prepolymer, 0.2wt% hexamethoxymethylmelamine resin, 0.1wt% fluorinated graphite and ethyl acetate, and spray evenly on the surface of the glass plate to obtain superhydrophobic Rough glass plate; add 5wt% polyvinylidene fluoride, 10wt% acrylic acid, 1wt% dopamine, 1wt% polyethyleneimine, 83wt% N,N-dimethylacetamide into the reaction kettle, and react at 25°C for 72h to obtain Uniform casting film solution, which is uniformly scraped on a super-hydrophobic rough glass plate, immersed in water, taken out to obtain a polymer microporous support film; immersed in 0.1wt% trimesoyl chloride n-hexane solution, reacted for 0.5 minutes, Obtain an aminated cross-linked transition layer; immerse in 0.5wt% citric acid, 0.5wt% ferric chloride, 0.1wt% graphite phase nitrogen carbide, 98.9wt% ethylene glycol, and heat in a microwave oven for 0.5 minutes under the condition of 900W , to obtain nano-hybrid multi-skinned layers.

[0084] After testin...

Embodiment 2

[0086]Mix 20wt% polydimethylsiloxane (PDMS) prepolymer, 2wt% hexamethylene diisocyanate trimer, 10wt% fluorinated graphene and 68wt% chloroform, and spray evenly on the surface of the glass plate to obtain Superhydrophobic rough glass plate; add 35wt% polysulfone, 35wt% hydroxyethyl methacrylate, 10wt% tannic acid, 10wt% polyetheramine, 10wt% triethyl phosphate into the reaction kettle, and react at 100°C for 4h, Obtain a uniform casting film solution, scrape it evenly on a super-hydrophobic rough glass plate, immerse it in ethanol, take it out, and obtain a polymer microporous support film; immerse it in the acetone solution of 10wt% terephthaloyl chloride, and react for 10 minutes , to obtain an aminated cross-linked transition layer; immersed in 20wt% citric acid, 10wt% iron sulfate, 5wt% graphite phase nitrogen carbide, and 65wt% water, heated in a microwave oven for 10 minutes under 600W to obtain a nano-hybrid multi-skin layer.

[0087] After testing, when using 1mol / L s...

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Abstract

The invention discloses a multifunctional load type nano multilayer composite membrane, and a preparation method and application thereof. The composite membrane comprises a polymer microporous supporting layer, an amination cross-linked transition layer and a nano-hybridized multifunctional skin layer. The preparation method comprises the following steps: preparing and generating the polymer microporous support layer on a super-hydrophobic rough substrate, and then preparing the aminated cross-linked transition layer and the nano-hybridized multi-skin layer in sequence. The polymer microporous membrane in the multifunctional load type nano multilayer composite membrane is high in porosity, large in aperture and high in water molecule permeation rate, and meanwhile, the super-hydrophobic rough surface prevents reverse circulation of water molecules; the aminated cross-linked transition layer is compact and has no defect, so that the separation performance of the membrane material is improved, and active sites are provided for loading of the nano material; and the nano-hybridized multifunctional skin layer can catalytically degrade small molecular substances, has a sterilization / bacteriostasis effect, prolongs the service life of the membrane material, complements advantages of multiple layers, couples multiple functions, and can realize seawater desalination, sewage purification, oil-water separation and the like.

Description

technical field [0001] The invention relates to a forward osmosis membrane, in particular to a multifunctional loaded nano-multilayer composite membrane and its preparation method and application, 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. Severe liquefaction and low water flux. During the operation of the composite membrane, dyes,...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D17/02B01D67/00B01D69/02B01D69/10C02F1/00C02F1/44C02F1/50C02F103/08C02F101/30
CPCB01D17/02B01D67/0079B01D69/02B01D69/10B01D69/12B01D69/125B01D2325/10B01D2325/48C02F1/00C02F1/445C02F1/50C02F2101/308C02F2103/08C02F2303/20Y02A20/131
Inventor 朱丽静曾志翔宋海明王刚
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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