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Preparation method of graphene-carbon nano-tube composite nanofiltration membrane with high flux

A carbon nanotube composite and graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low water flux of graphene nanofiltration membrane, and achieve good thermal stability and chemical stability. Stability, easy cost, good effect of anti-fouling performance

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

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Problems solved by technology

However, due to the restricted relationship between permeability and selectivity, the water flux of the existing graphene nanofiltration membranes is low.

Method used

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  • Preparation method of graphene-carbon nano-tube composite nanofiltration membrane with high flux
  • Preparation method of graphene-carbon nano-tube composite nanofiltration membrane with high flux

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preparation example Construction

[0023] A preparation method of graphene-carbon nanotube composite nanofiltration membrane, comprising the following specific steps:

[0024] (1) Disperse carboxylated carbon nanotubes in deionized water, then add partially reduced graphene oxide to the above-mentioned carbon nanotube dispersion, and obtain a mixed dispersion after ultrasonic dispersion. The concentration of the carboxylated carbon nanotubes 0.08-0.8mg / L, the concentration of partially reduced graphene oxide is 0.15-1.5mg / L;

[0025] (2) Then pour the mixed dispersion prepared in step 1 into a suction filter bottle with a porous support membrane, and perform suction filtration for 0.1 to 10 hours to obtain a composite nanofiltration membrane;

[0026] (3) The composite nanofiltration membrane prepared in step 2 is vacuum-dried at 40-100° C. to obtain a high-flux graphene-carbon nanotube composite nanofiltration membrane.

[0027] The partially reduced graphene oxide in the step 1 is obtained through the follow...

Embodiment 1

[0036] 1. Preparation of partially reduced graphene oxide:

[0037] 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.

[0038] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 5.6g / L.

[0039] 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;

[0040] 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.

[0041] 2. Disperse 24 μg of carboxylated carbon nanotubes in 300ml of deionized water, and then ultrasonically disperse for 30 minutes; then add 900 μl of the partially reduced graphene oxide solution prepared in step 1 to the above dispersion, and in the resulting mixed solution, The concentration of carbon nanotubes was 0.08 mg / L,...

Embodiment 2

[0046] 1. Preparation of partially reduced graphene oxide:

[0047] 1.1 Prepare graphene oxide solution with hummer.

[0048] 1.2 Measure the concentration of the graphene oxide solution prepared in step 1.1 to be 7.5g / L.

[0049] 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;

[0050] 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.

[0051] 2. Disperse 240 μg of carboxylated carbon nanotubes in 300ml of deionized water, and then ultrasonically disperse for 30 minutes; then add 90 μl of the partially reduced graphene oxide solution prepared in step 1 to the above dispersion, and in the resulting mixed solution, The concentration of carbon nanotubes was 0.8 mg / L, and the solubility of partially reduced graphene oxide was 0.15 mg / L, followed by ultrasonic di...

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Abstract

The invention discloses a graphene-carbon nano-tube composite nanofiltration membrane with high flux and a preparation method of the graphene-carbon nano-tube composite nanofiltration membrane. The composite nanofiltration membrane is prepared by uniformly depositing a full-carbon selective separation layer on a porous polymer supporting layer by using the method disclosed by the invention, wherein the full-carbon selective separation layer is formed by compounding and assembling graphene and a carbon nano-tube. By using the method disclosed by the invention, the carbon nano-tube 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 high in water flux, good in pollution resistance, high in retention rate (approach to 100%) of organic dyes, relatively high in salt removing rate of the organic dyes and capable of keeping relatively high flux under the conditions of high operation pressure and high salinity. 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-carbon nanotube 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] Most of the existing nanofiltration membranes are composite structure membranes, that is, a layer of polymer skin with selective separation is formed on the porous support layer. Most o...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/12B01D67/00
Inventor 高超韩燚姜炎秋
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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