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Preparation method of polyamide composite nanofiltration membrane containing modified carbon nano tube

A composite nanofiltration membrane and carbon nanotube technology, applied in the field of membrane separation, can solve the problems of non-polar organic solvents that are difficult to disperse, limit the application of carbon nanotubes, and be difficult to disperse, so as to achieve easy industrial production and application, improve defects, The effect of enhancing the interaction force

Inactive Publication Date: 2013-11-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, its surface is complete and smooth, with very few dangling bonds, poor wettability with other substances, insoluble in solvents, difficult to disperse in most polymers, and easy to aggregate into bundles in solutions, which greatly limits carbon Applications of nanotubes in various aspects
At present, after chemical modification of carbon nanotubes, carbon nanotubes can be better dispersed in polar solvents, such as water, tetrahydrofuran (THF), N,N-dimethylformamide (DMF), etc., but basically Difficult to disperse in non-polar organic solvents

Method used

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  • Preparation method of polyamide composite nanofiltration membrane containing modified carbon nano tube
  • Preparation method of polyamide composite nanofiltration membrane containing modified carbon nano tube
  • Preparation method of polyamide composite nanofiltration membrane containing modified carbon nano tube

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Take 1g of multi-walled carbon nanotubes (average diameter of 10-30 nanometers, length of 1-2 microns), add 75mL 98% sulfuric acid and 25mL 65% nitric acid (volume ratio 3:1), ultrasonic dispersion at 50 ℃ for 60 minutes, and then 80 The reaction was carried out in a water bath at ℃ for 2 hours, the reaction product was added with 2000 mL of pure water and then filtered with a water membrane with a pore size of 0.22 μm, washed until the filtrate had a pH value of 7, and dried under vacuum at 80 ℃. Scrape the dried carboxylated carbon tube from the wall of the beaker and grind it into powder for later use. The obtained carboxylated carbon tubes are carbon nanotubes treated with mixed acid. See the scanning electron micrograph figure 1 . Dissolve 0.1g of SDS (sodium dodecyl sulfate) in 5mL of water, add 0.1g of carboxylated carbon tube and 1.5g of MMA (methyl methacrylate), sonicate for 30min, and take 0.015g of it and recrystallize it with ethanol. The purified AIBN was ...

Embodiment 2-5

[0042] Example 2-5: The concentration of piperazine in the aqueous medium was adjusted, as shown in Table 1, and the remaining reaction conditions were the same as in Example 1.

[0043] The PMMA-MWNTs aromatic polyamide hybrid nanofiltration membrane prepared in Examples 1-5 was tested for water flux and sodium sulfate rejection. The results are shown in Table 1.

[0044] Examples 1-5 are to investigate the effect of piperazine concentration in the aqueous medium on the water flux and salt rejection rate of the PMMA-modified carbon tube composite nanofiltration membrane.

[0045] Table 1

[0046]

Embodiment 6-9

[0047] Examples 6-9: The concentration of trimesoyl chloride in the organic phase was changed, as shown in Table 2, and the remaining reaction conditions were the same as in Example 1.

[0048] The PMMA-MWNTs aromatic polyamide hybrid nanofiltration membrane prepared in Examples 6-9 was tested for water flux and sodium sulfate rejection. The results are shown in Table 2. Examples 6-9 are to investigate the influence of the concentration of trimesoyl chloride in the oil phase medium on the water flux and salt rejection rate of the PMMA-modified carbon tube composite nanofiltration membrane.

[0049] Table 2

[0050]

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Abstract

The invention discloses a preparation method of a polyamide composite nanofiltration membrane containing a modified carbon nano tube, wherein the preparation method comprises the following steps: applying a mixed acid H2SO4 / HNO3 to process the carbon nano tube so as to prepare a carboxylation nano tube, taking the carboxylation nano tube and methyl methacrylate as raw materials and grafting polymethyl methacrylate with a micro-emulsion polymerization method under effects of a surfactant and AIBN in order to implement lipophilic non-polar treatment to a multi-wall carbon nano tube to obtain PMMA-MWNTs. The membrane prepared in the invention has the advantages of high water flux, high desalinization rate, simple preparation operation and mild reaction conditions and can be applied for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a hybrid nanofiltration composite membrane containing PMMA modified carbon nanotubes and a preparation method thereof. Background technique [0002] Nanofiltration is similar to reverse osmosis and ultrafiltration, both of which are membrane processes driven by pressure. The interfacial polymerization method is a method for preparing ultra-thin composite membranes, which has been successfully applied to reverse osmosis and nanofiltration composite membranes. Carbon nanotubes have a unique structure with a high aspect ratio and one-dimensional tubular shape, and have great potential for application in the field of composite materials. The application of carbon nanotubes in the preparation of pressure-driven membranes will greatly optimize the separation performance of pressure-driven membranes. The "Desalination and water treatment" magazine prepares carbon nan...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56B01D67/00
Inventor 沈江南李健俞昌朝王利祥曾淦宁
Owner ZHEJIANG UNIV OF TECH
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