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Graphene oxide composite nanofiltration membrane with ion selection and separation, and preparation method of composite nanofiltration membrane

A graphene composite, ion-selective technology, applied in the field of nanofiltration membrane, can solve the problem of no combination of GO and nanofiltration membrane, and achieve the improvement of hydrophilicity and ion transmission rate, low removal rate, and high water flux. Effect

Inactive Publication Date: 2018-08-10
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no method to effectively combine GO with nanofiltration membranes in the prior art

Method used

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  • Graphene oxide composite nanofiltration membrane with ion selection and separation, and preparation method of composite nanofiltration membrane
  • Graphene oxide composite nanofiltration membrane with ion selection and separation, and preparation method of composite nanofiltration membrane
  • Graphene oxide composite nanofiltration membrane with ion selection and separation, and preparation method of composite nanofiltration membrane

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preparation example Construction

[0039] The embodiment of the present invention also provides a preparation method of a graphene oxide composite nanofiltration membrane with ion-selective separation, comprising the following steps:

[0040](1) Preparation of the polymer intermediate layer: the integrity of the polymer intermediate support layer is crucial to forming a good separation layer. The present invention adopts the method of slit extrusion quantitative coating, selects the non-woven support layer diaphragm, and The polymer feed liquid is evenly coated on the surface of the non-woven support layer membrane, and the non-woven support is adjusted by adjusting the distance between the coating head and the non-woven support layer membrane and the feeding amount of the polymer feed liquid. The thickness of the non-woven fabric support layer is then cleaned and shaped through the gel tank, cleaning tank and quenching tank to obtain the bottom film of the polymer intermediate layer. Then, soak the bottom film...

Embodiment 1

[0043] Preparation of polymer interlayer:

[0044] The method of slit extrusion quantitative coating is used to evenly coat the polymer liquid on the surface of the support layer, and the thickness of the support layer is adjusted by adjusting the distance between the coating head and the support layer and the feeding amount, and then passes through the gel tank, The cleaning tank and the quenching tank clean and shape the membrane to obtain the polymer intermediate layer, and then soak the prepared bottom film in deionized water for later use.

[0045] Preparation of functionalized nanoscale separation layer:

[0046] First, 0.6% PIP, 2.5% acid absorbent and 1.5% humectant, pH = 11 water phase solution was ultrasonically treated for 30 minutes to make it fully mixed;

[0047] The oil phase monomer is 0.15% trimesoyl chloride, and the solvent is IsoparE.

[0048] Immerse one side of the base film in the aqueous phase solution for 10 seconds, remove the surface water phase by...

Embodiment 2

[0050] Preparation of polymer interlayer:

[0051] The method of slit extrusion quantitative coating is used to evenly coat the polymer liquid on the surface of the support layer, and the thickness of the support layer is adjusted by adjusting the distance between the coating head and the support layer and the feeding amount, and then passes through the gel tank, The cleaning tank and the quenching tank clean and shape the membrane to obtain the polymer intermediate layer, and then soak the prepared bottom film in deionized water for later use.

[0052] Preparation of functionalized nanoscale separation layer:

[0053] First, 0.6% PIP, 100ppm graphene oxide, 2.5% acid absorbent and 1.5% humectant, pH = 11 aqueous phase solution was subjected to ultrasonic treatment for 30 minutes to make it fully mixed;

[0054] The oil phase monomer is 0.15% trimesoyl chloride, and the solvent is IsoparE.

[0055] Immerse one side of the bottom film in the aqueous phase solution for 10 seco...

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Abstract

The invention provides a graphene oxide composite nanofiltration membrane with ion selection and separation, and a preparation method of the composite nanofiltration membrane. The graphene oxide composite nanofiltration membrane is a composite membrane and comprises a non-woven fabric support layer, a polymer interlayer and a functionalized nanoscale separation layer, and the non-woven fabric support layer, the polymer interlayer and the functionalized nanoscale separation layer are sequentially arranged from bottom to top. The functionalized nanoscale separation layer comprises a monolithic-layer nano graphene oxide; the non-woven fabric support layer is a functionalized non-woven fabric and has an integral multi-layer structure; and the material of the polymer interlayer is polysulfone,and the section pore structure is an asymmetrical spongy and finger-like pore structure. According to the invention, the monolithic-layer nano graphene oxide is introduced in an interfacial polymerization process, so that the hydrophilicity and the ion transmission rate of the nanofiltration membrane surface are improved; moreover, the morphology of the monolithic-layer nano graphene oxide is a lamellar fold structure, so that a surface morphology of a fold structure is provided to the nanofiltration membrane, and the surface area of the nanofiltration membrane is improved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a graphene oxide composite nanofiltration membrane with ion selective separation and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis. The preparation of high rejection, high flux and antifouling nanofiltration membrane has always been a research hotspot. However, how to achieve a balance between flux and rejection The balance has always been a problem. [0003] In recent years, GO (graphene oxide, graphene oxide) has been a research hotspot due to its special structure and properties. GO is a derivative of graphene, which has roughly the same structure as graphene, except that a large number of oxygen-containing hydrophilic functional groups, such as -OH, -O -, -COOH, -C=O, etc., so it has good dispersibility in water. GO membrane has ultra-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/56B01D71/68C02F5/00C02F103/02C02F1/44
Inventor 陈亦力张翠苗胡蕊蕊朱宏伟裴志强顾辉
Owner BEIJING ORIGIN WATER FILM TECH