Preparation method of graphene-cyclodextrin composite nanofiltration membrane with high pollution resistance

A composite nanofiltration membrane, graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as performance and service life decline, achieve low cost, good anti-fouling performance, water flow The effect of high volume recovery rate

Active Publication Date: 2015-01-14
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high anti-fouling performance, especially for protein pollutants, which has a high anti-fouling performance against the problem that the graphene nanofiltration membrane is easily polluted by protein pollutants during use, resulting in a decrease in performance and service life. Preparation method of good graphene-cyclodextrin composite nanofiltration membrane

Method used

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preparation example Construction

[0017] The preparation method of graphene-cyclodextrin composite nanofiltration membrane specifically comprises the following steps:

[0018] (1) After dispersing partially reduced graphene oxide in deionized water and ultrasonically dispersing, cyclodextrin was added to obtain a mixed dispersion. The concentration of the partially reduced graphene oxide was 0.15-1.5 mg / L, and the concentration of cyclodextrin The concentration is 0.05-4.5mg / L; the loading of cyclodextrin needs to be controlled: if the loading of cyclodextrin is too small, the antifouling performance of the obtained nanofiltration membrane will not be improved significantly; if the loading of cyclodextrin is too large, the excessive cyclodextrin On the contrary, dextrin will provide a large number of sites for pollutant adsorption, and will increase the surface roughness of the membrane, which is not conducive to the antifouling performance of the membrane.

[0019] (2) Then pour the mixed dispersion prepared ...

Embodiment 1

[0031] 1. Preparation of partially reduced graphene oxide:

[0032] 1.1 Use hummer to prepare graphene oxide solution. For the preparation method, refer to Z. Xu, Y. Zhang, P. Li, C. Gao, ACS Nano 2012, 6, 7103.

[0033] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 5.6g / L.

[0034] 1.3 Add water to the graphene oxide solution prepared in step 1.1, and dilute it into a graphene oxide solution with a concentration of 0.5g / L;

[0035] 1.4 Heat the graphene oxide solution prepared in step 1.3 to reflux at 90° C. for 3 hours to obtain a partially reduced graphene oxide solution with a solubility of 0.5 g / L.

[0036] 2. Evenly disperse 0.6 mL of the partially reduced graphene oxide solution in 300 mL of deionized water, add 0.6 mg β-cyclodextrin to obtain a mixed dispersion, the concentration of the partially reduced graphene oxide is 1 mg / L, and the cyclodextrin The concentration of dextrin is 2mg / L;

[0037] 3. Then pour 300 mL of the ...

Embodiment 2

[0041] 1. Preparation of partially reduced graphene oxide:

[0042] 1.1 Prepare graphene oxide solution with hummer.

[0043] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 7.5g / L.

[0044] 1.3 Add water to the graphene oxide solution prepared in step 1.1, and dilute it into a graphene oxide solution with a concentration of 0.5g / L;

[0045]1.4 Heat the graphene oxide solution prepared in step 1.3 to reflux at 120° C. for 1 hour to obtain a partially reduced graphene oxide solution with a solubility of 0.5 g / L.

[0046] 2. ultrasonically disperse 90 μL of the partially reduced graphene oxide solution prepared in step 1 in 300 mL of deionized water, add 450 μg α-cyclodextrin, 450 μg β-cyclodextrin and 450 μg γ-cyclodextrin to obtain a mixed dispersion, the The concentration of partially reduced graphene oxide is 0.15 mg / L, and the concentration of cyclodextrin is 4.5 mg / L;

[0047] 3. Then pour 300 mL of the dispersion into a suction f...

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Abstract

The invention discloses a graphene-cyclodextrin composite nanofiltration membrane with high pollution resistance and a preparation method of the graphene-cyclodextrin composite nanofiltration membrane, belonging to the technical field of membranes. The composite nanofiltration membrane is prepared by uniformly depositing a selective separation layer on a porous polymer supporting layer by using the method disclosed by the invention, wherein the selective separation layer is formed by compounding and assembling graphene and cyclodextrin. By using the method disclosed by the invention, the cyclodextrin can be effectively intercalated among graphene sheet layers which are compactly stacked. The nanofiltration membrane prepared by using the preparation method disclosed by the invention is good in pollution resistance, high in water flux, high in retention rate (approach to 100%) of organic dyes, relatively high in salt removing rate of the organic dyes and favorable in pollution resistance to organic pollutants such as proteins and polysaccharides. The preparation method disclosed by the invention is simple and easy, strong in controllability, relatively low in production cost and free of pollution so as to have favorable application prospects in the nanofiltration field.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a graphene-cyclodextrin composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a pressure-driven separation membrane with a molecular weight cut-off between 200-1000Da. Nanofiltration technology has the characteristics of low energy consumption, low investment, low maintenance cost, easy operation, high reliability and high throughput. It can replace reverse osmosis in many occasions. Therefore, nanofiltration membrane and nanofiltration technology have been used in the food chemical industry, It has been widely used in pharmaceutical industry, sewage treatment, desalination industry and other fields. [0003] The anti-fouling performance of nanofiltration membrane is an important factor that needs to be investigated in the practical use of nanofiltration membrane. Membrane fouling is usually ca...

Claims

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Application Information

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IPC IPC(8): B01D71/74B01D69/12B01D67/00
Inventor 高超韩燚姜炎秋
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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