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Carbon nano tube-polymer composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and carbon nanotube technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of water flux and desalination rate decline, and achieve a good industrial production base and production cost The effect of low, mild reaction conditions

Inactive Publication Date: 2010-11-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorine resistance performance of the composite membrane is improved, but the water flux and desalination rate are decreased to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0030] (1) Preparation of oil phase solution: Dissolve trimesoyl chloride with a concentration of 0.6 wt / v% in n-hexane;

[0031] (2) Preparation of aqueous phase solution: triethanolamine with a concentration of 6wt / v%, 0.3 wt / v% sodium lauryl sulfate, 0.6 wt / v% NaOH / Na 2 CO 3 (mass ratio 1:2) dissolved in deionized water, then added carbon nanotubes with a concentration of 0.05wt / v%, and ultrasonically dispersed for 20 minutes;

[0032] (3) The wet polysulfone supporting membrane is immersed in the oil phase solution, the immersion time is respectively 0 and 30 minutes, after taking out, roll the supporting membrane surface with a rubber roller, and squeeze dry;

[0033] (4) immerse the supporting film in the aqueous phase solution, the reaction time is 35 minutes, and take it out;

[0034] (5) Immerse the support film in the oil phase solution, and the reaction time is 35 minutes. After the composite film is naturally dried in the air for 1 minute, it is heat-treated ...

Embodiment 3-5

[0039] (1) preparation of oil phase solution: with embodiment 1-2;

[0040] (2) Preparation of aqueous phase solution: triethanolamine with a concentration of 6wt / v%, 0.3 wt / v% sodium lauryl sulfate, 0.6 wt / v% NaOH / Na 2 CO 3 (Mass ratio 1:2) Dissolve in deionized water, then add carbon nanotubes at a concentration of 0.01~0.04wt / v%, and ultrasonically disperse them evenly for 20 minutes;

[0041] (3) Immerse the wet polysulfone supporting membrane into the oil phase solution for 30 minutes, take it out, roll the supporting membrane surface with a rubber roller, and squeeze it dry;

[0042] (4) With embodiment 1-2.

[0043] These several examples are to investigate the effect of the concentration of carbon nanotubes in the water phase on the performance of the membrane.

[0044] Example

[0045] It can be seen from Examples 3-5 that with the increase of the concentration of carbon nanotubes in the water phase, the pure water flux and the desalination rate of sodiu...

Embodiment 6-9

[0047] (1) preparation of oil phase solution: with embodiment 1-2;

[0048] (2) preparation of aqueous phase solution: with embodiment 1-2;

[0049] (3) with embodiment 3-5;

[0050] (4) with embodiment 1-2;

[0051](5) Immerse the support membrane in the oil phase solution, and the reaction time is 5-40 minutes. After the composite membrane is naturally dried in the air for 1 minute, it is heat-treated in an oven at 60°C for 30 minutes. Then rinse with deionized water for several times to obtain the carbon nanotube-polyester composite nanofiltration membrane. The prepared composite membrane was stored in water, and its desalination performance was tested under the conditions of different concentrations of different brine solutions and an operating pressure of 0.6 MPa.

[0052] These several examples are to investigate the influence of reaction time on membrane performance in the oil phase.

[0053] Example

[0054] It can be seen from Examples 6-9 that with the ...

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PUM

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Abstract

The invention belongs to the field of membrane technology, and particularly relates to a carbon nano tube-polymer composite nanofiltration membrane and a preparation method thereof. The composite nanofiltration membrane is obtained by forming a layer of aromatic polymer functional cortex loaded with carbon nano tubes on a porous support membrane through the method of the invention. By using the method of the invention, the carbon nano tubes can be effectively loaded in the polymer functional cortex of a composite membrane, and the permeability and the selectivity of the prepared carbon nano tube-polymer composite nanofiltration membrane are superior to those of the membrane prepared by a traditional interfacial polymerization technology. The composite nanofiltration membrane surface functional cortex contains a great amount of carboxyl groups, and has higher permeability and desalinization ratio under a lower operation pressure. The preparation method of the invention has the advantages of simple operation process, mild reaction conditions, lower production cost and good application prospect of industrial production.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a carbon nanotube-polymer composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a membrane process between reverse osmosis and ultrafiltration. It can cut off substances with a molecular weight between 100 and 1000 Da. It is widely used in water softening, solution decolorization, dye desalination and concentration, and purification and concentration of biochemical substances. , resulting in certain economic and social benefits. Therefore, the preparation and application of nanofiltration membranes have attracted much attention and attention. Improving the permeability and selectivity of membranes has always been the goal of continuous exploration by researchers at home and abroad. However, for general polymer membranes, it is difficult to optimize both permeability and selectivity at the same time. Th...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00B01D69/10
Inventor 吴慧青汤蓓蓓武培怡
Owner FUDAN UNIV
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