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Application of a graphene oxide nanofiltration membrane under high operating pressure

A technology of operating pressure and graphene, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as limiting the application range of graphene nanofiltration membranes, and achieve the goal of improving water flux and acyl chloride. degree of effect

Active Publication Date: 2021-10-15
庄秀萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, for using graphene directly as nanofiltration membrane, the products prepared in the prior art can only be used in the low pressure range, generally no more than 0.2Mpa, thus limiting the scope of application of graphene nanofiltration membrane

Method used

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  • Application of a graphene oxide nanofiltration membrane under high operating pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of support by blending method

[0023] Mix PVDF, dimethylacetamide, polyethylene glycol, and NaA molecular sieve (silicon-aluminum ratio of 1) according to the mass ratio of 10:120:1:3, stir, and stand for degassing to form a casting solution, and cast it on the glass After scraping the film on the sheet, put it in water to solidify to form a film, soak it in deionized water, dry at 60°C, and then form a film as a support for later use;

[0024] (2) Modification of the acid chloride of the support

[0025] Immerse the surface of the support prepared in step (1) in n-hexane containing 0.5wt% isophthaloyl chloride for 2 hours. After the immersion, remove the surface solution and dry it at 60°C;

[0026] (3) Preparation of graphene oxide nanofiltration membrane

[0027] The modified support prepared in step (2) was immersed in an amino-modified graphene oxide aqueous solution (0.5wt%, adjusted to PH to 11 with NaOH) for 10 minutes, and then impregnated ag...

Embodiment 2

[0029] (1) Preparation of support by blending method

[0030] Mix PVDF, dimethylacetamide, polyethylene glycol, and ZSM-5 molecular sieve (silicon-aluminum ratio of 40) according to the mass ratio of 10:120:1:3, stir, stand for defoaming, and form a casting solution, and After scraping the film on the glass sheet, put it in water to solidify to form a film, soak it in deionized water, dry it at 60°C, and then form a film as a support for later use;

[0031] (2) Modification of the acid chloride of the support

[0032] Immerse the surface of the support prepared in step (1) in n-hexane containing 0.5wt% isophthaloyl chloride for 2 hours. After the immersion, remove the surface solution and dry it at 60°C;

[0033] (3) Preparation of graphene oxide nanofiltration membrane

[0034] The modified support prepared in step (2) was immersed in an amino-modified graphene oxide aqueous solution (0.5wt%, adjusted to PH to 11 with NaOH) for 10 minutes, and then impregnated again in an a...

Embodiment 3

[0036] (1) Preparation of support by blending method

[0037] Mix PVDF, dimethylacetamide, polyethylene glycol, and NaY molecular sieve (silicon-aluminum ratio of 6) according to the mass ratio of 10:120:1:3, stir, and stand for degassing to form a casting solution, and cast it on the glass After scraping the film on the sheet, put it in water to solidify to form a film, soak it in deionized water, dry at 60°C, and then form a film as a support for later use;

[0038] (2) Modification of the acid chloride of the support

[0039] Immerse the surface of the support prepared in step (1) in n-hexane containing 0.5wt% isophthaloyl chloride for 2 hours. After the immersion, remove the surface solution and dry it at 60°C;

[0040] (3) Preparation of graphene oxide nanofiltration membrane

[0041] The modified support prepared in step (2) was immersed in an amino-modified graphene oxide aqueous solution (0.5wt%, adjusted to PH to 11 with NaOH) for 10 minutes, and then impregnated ag...

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Abstract

The invention discloses the application of a graphene oxide nanofiltration membrane under high operating pressure, which is characterized in that: the graphene oxide nanofiltration membrane is carried out at an operating pressure greater than 0.2MPa, and the graphene oxide nanofiltration membrane includes A support and a separation layer, the support is an organic / inorganic hybrid membrane comprising hydrophilic molecular sieves and polymers, the separation layer is formed by interfacial polymerization of aminated graphene oxide and acid chloride compounds, and the The above-mentioned support body and the aminated graphene oxide are cross-linked by acid chloride. The application provided by the invention can meet the application requirements of the graphene oxide nanofiltration membrane under high operating pressure, and has high application potential.

Description

technical field [0001] The invention relates to the application of a nanofiltration membrane, in particular to the application of a graphene oxide nanofiltration membrane under high operating pressure. Background technique [0002] Nanofiltration technology is a membrane separation technology separated from reverse osmosis technology, and is a continuation and development branch of ultra-low pressure reverse osmosis technology. For a long time in the past, nanofiltration membranes were called ultra-low pressure reverse osmosis membranes or selective reverse osmosis membranes or loose reverse osmosis membranes. Japanese scholars have specifically defined the separation performance of nanofiltration membranes: membranes with operating pressure ≤ 1.50mPa, molecular weight cut-off 200-1000, and NaCl rejection ≤ 90% can be considered as nanofiltration membranes. Now, nanofiltration technology has been separated from reverse osmosis technology and has become an independent separa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D67/00B01D61/02
CPCB01D61/027B01D67/0079B01D69/10B01D69/105
Inventor 穆效平
Owner 庄秀萍
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