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Application of graphene oxide nanofiltration membrane under high operation pressure

A technology of operating pressure and graphene, applied in the direction of membrane technology, semipermeable 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: 2020-09-11
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 graphene oxide nanofiltration membrane under high operation 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...

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 defoaming 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...

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Abstract

The invention discloses an application of a graphene oxide nanofiltration membrane under high operation pressure. The application is characterized by comprising the following steps: carrying out operation on a graphene oxide nanofiltration membrane under the operation pressure of more than 0.2 MPa, wherein the graphene oxide nanofiltration membrane comprises a support body and a separation layer,the support body is an organic / inorganic hybrid membrane containing a hydrophilic molecular sieve and a polymer, the separation layer is formed by interfacial polymerization of aminated graphene oxideand an acyl chloride compound, and the support body and the aminated graphene oxide are cross-linked through acyl chloride. The application provided by the invention can meet the application requirements of the graphene oxide nanofiltration membrane under high operation pressure, and has higher 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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IPC IPC(8): B01D69/10B01D67/00B01D61/02
CPCB01D61/027B01D67/0079B01D69/10B01D69/105
Inventor 穆效平
Owner 庄秀萍
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