Stable-structure high-performance graphene oxide nanofiltration composite membrane and preparation method thereof

A structurally stable, graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing the service life of composite nanofiltration membranes, impairing the separation performance of composite nanofiltration membranes, etc., and achieve excellent structure. Effects of stability, high water flux

Inactive Publication Date: 2017-05-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the inconsistent swelling degree of the two layers of materials will also cause the separation layer to peel off from the support layer, which will damage the separation performance of the composite nanofiltration membrane and reduce the service life of the composite nanofiltration membrane.

Method used

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  • Stable-structure high-performance graphene oxide nanofiltration composite membrane and preparation method thereof
  • Stable-structure high-performance graphene oxide nanofiltration composite membrane and preparation method thereof
  • Stable-structure high-performance graphene oxide nanofiltration composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of polyethersulfone porous support layer: Blend 12.8g polyethersulfone, 12.8g polyethylene glycol and 54.4g N,N-dimethylformamide into a 250mL three-necked flask, and stir at 65°C for 6h , stand for defoaming, scrape the film with a glass rod, place the obtained liquid film in a gel water bath at room temperature, and transform it into a porous support layer through non-solvent-induced phase inversion. The effective area of ​​the film is 27.2cm 2 , soak the polyethersulfone porous membrane in deionized water, and set aside.

[0030] Dissolve 0.1 g of dopamine in 50 mL of tris aqueous solution with a concentration of 6 g / L to prepare a 2 g / L dopamine aqueous phase solution for subsequent use.

[0031] Disperse 0.163 mg of graphene oxide in 50 mL of deionized water to prepare a graphene oxide aqueous solution for subsequent use.

[0032] Soak the polyethersulfone porous membrane obtained in the above step (1) in a 2g / L dopamine aqueous solution, control the s...

Embodiment 2-4

[0035] The volume of the graphene oxide aqueous solution was changed, and the rest are the same as in Example 1. The test results of its flux and selectivity are shown in Table 1.

[0036]

[0037] Example 1-4 is to investigate the influence of the amount of graphene oxide aqueous solution on the performance of the prepared GO-PDA / PES nanofiltration membrane.

example 5-7

[0039] Embodiment 5-7 except that the concentration of dopamine aqueous solution is changed, all the other are the same as embodiment 3

[0040]

[0041]

[0042] Examples 8-10 are to investigate the influence of the concentration of the dopamine aqueous solution on the performance of the prepared GO-PDA / PES nanofiltration composite membrane.

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Abstract

The invention relates to stable-structure high-performance graphene oxide nanofiltration composite membrane and a preparation method thereof; the composite membrane comprises a polyethersulfone porous layer, a dopamine layer and a graphene oxide layer sequentially from bottom to top, wherein the polyethersulfone porous layer is 200-800 Mum in thickness, the dopamine layer is 1-50 Mum in thickness, and the graphene oxide layer is 10-200 Mum in thickness. The very high adherence of the polydopamine layer is utilized for the first time, the thin graphene oxide layer high in throughput and good in selectivity is deposited to the polyethersulfone porous support layer, and good structure stability is imparted to the nanofiltration membrane. The nanofiltration composite membrane prepared by using the method has high water throughput, high reception rat and good structure stability.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane separation, in particular to a method for preparing a structurally stable graphene nanofiltration composite membrane. Background technique [0002] Membrane separation technology uses membrane as the separation medium and external pressure or chemical potential difference as the driving force to realize the separation of mixtures. Nanofiltration membrane separation technology is a new pressure-driven membrane separation technology between reverse osmosis and ultrafiltration, with a pore size range of 0.5-2nm. The pore size characteristics of the nanofiltration membrane endow it with the advantage of high-efficiency interception of organic molecules with a molecular weight of more than 200Da under low pressure. In addition, compared with traditional separation technology, nanofiltration membrane separation technology has the advantages of low energy consumption and simple operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D61/00B01D67/00B01D71/02B01D71/68
CPCB01D69/12B01D61/027B01D67/0079B01D69/02B01D71/021B01D71/68
Inventor 陈建新王重斌李志远韩健吴洪
Owner HEBEI UNIV OF TECH
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