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Preparation method of macromolecular modified self-supporting carbon nanotube assembling membrane

A technology of carbon nanotubes and polymers, which is applied in the field of membrane separation, can solve the problems of reduced service life, reduced film thickness, and reduced membrane strength, and achieves the effects of increased permeation flux, reduced thickness, and reduced use

Inactive Publication Date: 2017-03-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the vacuum-assisted self-assembly method also has certain disadvantages. For example, due to the reduction of film thickness, the strength of the film is also reduced, which reduces the service life of the film.

Method used

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  • Preparation method of macromolecular modified self-supporting carbon nanotube assembling membrane
  • Preparation method of macromolecular modified self-supporting carbon nanotube assembling membrane
  • Preparation method of macromolecular modified self-supporting carbon nanotube assembling membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, preparation of polyethyleneimine modified self-supporting carbon nanotube assembly film, the preparation process is as follows:

[0028] Step 1. Preparation of polyethyleneimine-modified carbon nanotube solution: Dissolve 0.6g polyethyleneimine in 40mL water. After fully dissolving, polyethyleneimine solution is obtained, and 0.04g polyethyleneimine is added to the polyethyleneimine solution. The carboxylated carbon nanotubes were subjected to ultrasonic reaction for 0.5h, and the obtained polyethyleneimine-modified carbon nanotube solution was left to stand for 12h, centrifuged, and the upper layer solution was taken to obtain a polyethyleneimine-modified carbon nanotube solution.

[0029] Step 2. Preparation of self-supporting carbon nanotube assembly film: Dilute the polyethyleneimine-modified carbon nanotube solution obtained in step 1 with deionized water until the carbon nanotube concentration is 1 mg / L, and take 120 mL of the diluted solution. Vacuu...

Embodiment 2

[0031] Example 2, preparation of polyvinyl alcohol modified self-supporting carbon nanotube assembly film, the preparation process is basically the same as in Example 1, the difference is that the polymer material is changed from polyethyleneimine to polyvinyl alcohol, and finally obtained The polyvinyl alcohol-modified self-supporting carbon nanotube assembly film with a film thickness of about 2 μm is denoted as: PVA@CNT.

[0032] The PVA@CNT ultrafiltration membrane prepared in Example 2 was analyzed by an electron microscope, and the membrane pores were evenly distributed, the film-forming performance was good, and it had a high membrane porosity. Due to the introduction of hydrophilic polyvinyl alcohol, the hydrophilicity of the prepared polyacrylic acid modified self-supporting carbon nanotube assembly film was significantly improved, as shown in Figure 4 . The permeation flux of the prepared polyvinyl alcohol-modified carbon nanotube ultrafiltration membrane is as fol...

Embodiment 3

[0033] Example 3, preparation of polyacrylic acid modified self-supporting carbon nanotube assembly film, the preparation process is basically the same as in Example 1, the difference is that the polymer material therein is replaced by polyacrylic acid from polyethyleneimine, and finally the film thickness is about Polyacrylic acid modified self-supporting carbon nanotube assembly film with a thickness of 2 μm is denoted as: PAA@CNT.

[0034] The PAA@CNT ultrafiltration membrane prepared in Example 3 was analyzed by an electron microscope, and the membrane pores were evenly distributed, the film-forming performance was good, and it had a high membrane porosity. Due to the introduction of hydrophilic polyacrylic acid, the hydrophilicity of the prepared polyacrylic acid modified self-supporting carbon nanotube assembly film was significantly improved, as shown in Figure 7 . The permeation flux of the prepared polyacrylic acid modified carbon nanotube ultrafiltration membrane i...

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Abstract

The invention discloses a preparation method of a macromolecular modified self-supporting carbon nanotube assembling membrane. The method mainly comprises the following steps: carrying out ultrasonic reaction through utilizing a mutual effect between a macromolecular material and carbon nanotubes and taking water as a solvent; centrifuging and separating to obtain a macromolecular modified carbon nanotube solution; diluting the prepared macromolecular modified carbon nanotube solution with de-ionized water; filtering in vacuum to a micro-filtration membrane of mixed cellulose with the pore diameter of 0.22 microns; after drying, removing a base membrane to obtain the macromolecular modified self-supporting carbon nanotube assembling membrane with the membrane thickness of 1mu.m to 3mu.m and the permeation flux of 3100Lm<-2>h<-1>bar<-1> to 4600Lm<-2>h<-1>bar<-1>. A preparation process is simple and easy to operate; compared with a traditional phase inversion ultra-filtration membrane, the membrane thickness of prepared ultra-filtration membrane is greatly reduced and the utilization of raw materials is reduced; compared with other ultra-filtration membranes which are prepared by vacuum replication and self-assembling, the membrane strength is improved to the great extent; the ultra-filtration membrane prepared by the method can be used for separating oil-containing wastewater.

Description

technical field [0001] The invention relates to a preparation method of polymer modified self-supporting carbon nanotube assembly film. It belongs to the technical field of membrane separation. Background technique [0002] Membranes are widely found in nature. In organisms, the membrane is the permanent basis of all life activities. In the practice of life and production, people have already unconsciously contacted and applied the membrane process. The "Huainanzi" of the Han Dynasty in my country has a description of making tofu. Earliest record. Although it has existed extensively and permanently in nature, especially in organisms, human beings have only known about membranes for more than 200 years. In 1960, membrane and membrane technology began to attract extensive attention from academic, technical and industrial circles, and quickly set off a climax of research and development of various separation membranes and membrane processes, and modern membrane science and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/14B01D71/02B01D71/38B01D71/58
CPCB01D67/0079B01D61/145B01D71/021B01D71/38B01D71/58
Inventor 姜忠义刘亚楠苏延磊曹佳琳张润楠
Owner TIANJIN UNIV
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