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Method for preparing oxidized graphene compound nanofiltration membrane through freeze drying technology

A composite membrane and technology technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as structural defects, small permeation flux contribution, and reduced separation selectivity, so as to achieve structural stability and improve membrane efficiency. Osmotic flux, simple operation effect

Inactive Publication Date: 2018-12-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both methods have their own deficiencies, such as small molecule chemical cross-linking contributes little to the improvement of permeation flux; physical blending to introduce nanoparticles (template) filling is difficult to realize the controllable construction of nanotransport channels and particle agglomeration causes structural defects Reduce the separation selectivity and other issues

Method used

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  • Method for preparing oxidized graphene compound nanofiltration membrane through freeze drying technology
  • Method for preparing oxidized graphene compound nanofiltration membrane through freeze drying technology

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Experimental program
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Effect test

Embodiment 1

[0023] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane with a membrane pore size of 0.1 μm and a membrane area of ​​10 cm 2 , the selected GO dispersant is deionized water, and the concentration of graphene oxide dispersion is 0.001g / L.

[0024] Preparation method of f-GO film

[0025] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0026] (2) Disperse a certain amount of GO powder in deionized water, and use ultrasonic centrifugation to prepare a GO dispersion with a concentration ratio of 0.001g / L;

[0027] (3) Assemble the GO dispersion prepared in (2) onto the treated alumina-based membrane by suction filtration deposition, the suction filtration pressure is 0.1MPa, and the suction filtration time is 1min;

[0028] (4) Put the wet-state oxidized GO...

Embodiment 2

[0031] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane with a membrane pore size of 0.1 μm and a membrane area of ​​10 cm 2 , the selected GO dispersant is deionized water, and the concentration of GO dispersion is 0.5g / L.

[0032] Preparation method of f-GO film

[0033] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0034] (2) Disperse a certain amount of GO powder in deionized water, and use ultrasonic centrifugation to prepare a GO dispersion with a concentration ratio of 0.5g / L;

[0035] (3) Assemble the GO dispersion prepared in (2) onto the treated alumina-based membrane by suction filtration deposition, the suction filtration pressure is 0.1MPa, and the suction filtration time is 1min;

[0036] (4) Put the wet GO composite membrane prepared in...

Embodiment 3

[0039] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane with a membrane pore size of 0.1 μm and a membrane area of ​​10 cm 2 , the selected graphene oxide dispersant is deionized water, and the concentration of GO dispersion is 0.003g / L.

[0040] Preparation method of f-GO film

[0041] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0042] (2) Disperse a certain amount of GO powder in deionized water, and use ultrasonic centrifugation to prepare a GO dispersion with a concentration ratio of 0.003g / L;

[0043] (3) Assemble the GO dispersion prepared in (2) onto the treated alumina-based membrane by suction filtration deposition, the suction filtration pressure is 0.1MPa, and the suction filtration time is 1min;

[0044] (4) Put the wet GO composite membra...

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Abstract

The invention discloses a method for preparing an oxidized graphene compound nanofiltration membrane through a freeze drying technology and belongs to the field nanofiltration membrane separation. Themethod comprises the following steps: pretreating a porous base membrane and removing surface impurities; respectively dispersing GO powder into deionized water and utilizing ultrasonic and centrifugal modes to prepare GO dispersion liquid; utilizing a suction filtration deposition mode to assemble GO to the surface of the porous base membrane to prepare a wet-state GO composite membrane; for theobtained wet-state GO membrane, utilizing a dry air blowing mode to regulate a water content in the membrane; under the low temperature condition, completely ice crystallizing water in the GO membrane and then sublimating and drying to prepare a novel GO nanofiltration (f-GO) membrane. The oxidized graphene compound nanofiltration membrane can be applied to removing dye and high-valence salt in water and small molecules in an organic system and has good separability and stability.

Description

technical field [0001] The invention relates to a method for preparing a graphene oxide (GO) composite nanofiltration membrane by freeze-drying technology, and belongs to the field of nanofiltration membrane separation. Background technique [0002] Nanofiltration technology is considered to be an effective means of separating high-priced salts and small organic molecules in a liquid phase system because of its advantages of simple operation, high efficiency and energy saving, and no secondary pollution. Nanofiltration membranes are the key to nanofiltration technology. At present, among all nanofiltration membrane materials, polymer membranes are the most widely used, mainly due to their simple preparation process, high mechanical strength, and easy assembly into integrated membrane modules, which are easy to use on a large scale. However, polymer nanofiltration membranes still have disadvantages such as poor chemical and thermal stability, easy fouling, and low lifetime. ...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/04B01D69/06B01D69/12B01D71/02
CPCB01D61/027B01D67/0039B01D69/04B01D69/06B01D69/12B01D71/021B01D71/024B01D71/025B01D71/027
Inventor 安全福张文海金成刚王乃鑫纪树兰
Owner BEIJING UNIV OF TECH