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A composite separation membrane with non-directional nanochannels and its preparation method

A nano-channel, non-directional technology, applied in the field of separation membrane preparation and modification, can solve the problems of ineffective utilization of graphene oxide modified separation membrane, poor stability of graphene oxide separation membrane, etc., to improve water flux and desalination rate. , to avoid irreversible effects, to ensure the effect of stability

Active Publication Date: 2019-11-15
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the prior art, the object of the present invention is to solve the problem that the graphene oxide separation membrane has poor stability and the graphene oxide modified separation membrane cannot effectively utilize two-dimensional nanochannels, and the graphite oxide with two-dimensional nanochannels The ene core-shell structure is embedded in the composite membrane, providing a stable and effective use of graphene oxide two-dimensional nanochannel separation membrane embedded with the core-shell structure and its preparation method

Method used

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  • A composite separation membrane with non-directional nanochannels and its preparation method
  • A composite separation membrane with non-directional nanochannels and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Take 100 ml of 0.01 mg / ml graphene oxide solution, add 0.5 g of chitosan microspheres with an average particle size of 20 μm, stir at room temperature for 1 h, filter and wash, and freeze-dry to obtain an oxidized core-shell structure.

[0028] (2) Weigh 0.05g of the core-shell structure and disperse it in 76.95g of N,N-dimethylacetamide, then add 5g of polyvinylpyrrolidone and 18g of polyethersulfone, stir at 70°C for 5h, then stand at room temperature for defoaming to obtain Casting solution. A thin layer of casting solution is coated on the non-woven fabric with a stainless steel scraper, and then placed in deionized water for phase inversion to obtain a polyethersulfone porous support layer embedded with a core-shell structure.

[0029](3) The porous support layer is contained in the concentration of 0.1wt% sodium dodecyl sulfonate in 1% m-phenylenediamine aqueous solution for 3 minutes, then the m-phenylenediamine solution is poured off, and the support layer i...

Embodiment 2

[0031] (1) Take 100ml of 0.01mg / ml carboxylated graphene solution, add 0.5g of quaternary ammonium chitosan microspheres with an average particle size of 20 μm, stir at room temperature for 1 hour, filter and wash, and freeze-dry to obtain a core-shell structure.

[0032] (2) Weigh 0.1g of the core-shell structure and disperse it in 76.9g of N,N-dimethylacetamide, then add 5g of polyvinylpyrrolidone and 18g of polysulfone, stir at 70°C for 5h, then stand at room temperature for defoaming to obtain a cast Membrane fluid. A thin layer of casting solution is coated on the non-woven fabric with a stainless steel scraper, and then placed in deionized water for phase inversion to obtain a polyethersulfone porous support layer embedded with a core-shell structure.

[0033] (3) the porous support layer is contained in the concentration of 0.1wt% sodium dodecyl sulfonate in 2% m-phenylenediamine aqueous solution for 3 minutes, then the m-phenylenediamine solution is poured off, and the...

Embodiment 3

[0035] (1) Take 100 ml of 0.01 mg / ml graphene oxide solution, add 0.5 g of aminated chitosan microspheres with an average particle size of 20 μm, stir at room temperature for 1 h, filter and wash, and freeze-dry to obtain a core-shell structure.

[0036] (2) Weigh 0.2g of the core-shell structure and disperse it in 76.8g of N,N-dimethylacetamide, then add 5g of polyvinylpyrrolidone and 18g of polyethersulfone, stir at 70°C for 5h, then stand at room temperature for defoaming to obtain Casting solution. A thin layer of casting solution is coated on the non-woven fabric with a stainless steel scraper, and then placed in deionized water for phase inversion to obtain a polyethersulfone porous support layer embedded with a core-shell structure.

[0037] (3) The porous support layer is contained in the concentration of 0.1wt% sodium dodecyl sulfonate in 3% m-phenylenediamine aqueous solution for 3 minutes, then the m-phenylenediamine solution is poured out, and the support layer is ...

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Abstract

The invention discloses a composite separation membrane provided with non-directional nano-channels and a preparation method of the composite separation membrane. Core-shell structured nanoparticles containing the non-directional nano-channels are inlaid in a porous support layer of the composite separation membrane, the thickness of the porous support layer is 20-80 mu m, and the size of the nanoparticles is 10-50 mu m. The porous support layer is prepared firstly by adding the nanoparticles to a membrane casting solution through blending, and then the composite separation membrane is prepared through interfacial polymerization. The nanoparticles are inlaid in the 20-80-mu m-thick porous support layer instead of being inlaid in a dense layer with the thickness being about 100 nm, so thatstability of the nanoparticles is guaranteed, and irreversible influence of falling off of the nanoparticles on membrane performance is avoided; meanwhile, the nanoparticles bulging out of the surfaceof the porous support layer extend into the dense layer, inlets and outlets of the nano-channels are just exposed out of the membrane surface, and accordingly, water flux and salt rejection rate of the membrane material are increased more effectively.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation and modification, and in particular relates to a separation membrane structure embedded with a core-shell structure and a preparation method thereof. Background technique [0002] Composite separation membrane refers to the reverse osmosis membrane and nanofiltration membrane used in the water treatment process. These two composite membranes generally have a substrate, a porous support layer and a dense layer. The substrate is used to provide mechanical strength, and the porous support layer is used to provide support for the dense layer, usually similar to an ultrafiltration membrane. In order to improve and enhance the flux, antibacterial or anti-pollution performance of the existing composite membranes, researchers generally choose to combine nano-channels with silica, titanium dioxide, nano-silver, molecular sieves, aquaporins, carbon nanotubes, etc. Nanomaterials such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/10B01D71/02B01D71/06
CPCB01D67/0079B01D69/105B01D69/125B01D71/021B01D71/06
Inventor 高学理魏怡王小娟凌琦孙培磊
Owner OCEAN UNIV OF CHINA