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Preparation method of high-performance polyelectrolyte-carbon nanotube nanocomposite pervaporation membrane

A technology of nanocomposites and polyelectrolytes, which is applied in the field of preparation of high-performance polyelectrolyte-carbon nanotube nanocomposite pervaporation membranes, can solve the problems of poor membrane stability and reduced membrane permeability, and achieve uniform structure and high separation Effects of Factors and Fluxes

Active Publication Date: 2010-04-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the good water solubility of a single polyelectrolyte, the stability of the membrane is poor; the stability of the membrane is improved to a certain extent through the cross-linking reaction, but the permeability of the membrane is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1 mass part of sodium carboxymethyl cellulose was vacuum-dried at 50°C for 10 h, and 0.5 mass parts of dried carboxymethyl cellulose sodium was dissolved in 200 mass parts of water at a magnetic stirring speed of 300 rpm to form carboxymethyl cellulose Sodium solution, add 0.08 parts by mass of hydrochloric acid. 0.8 parts by mass of chitosan was vacuum-dried at 50° C. for 10 h, 0.4 parts by mass of chitosan after drying was dissolved in 200 parts by mass of water at a magnetic stirring speed of 300 rpm to form a chitosan solution, and 0.08 parts by mass of hydrochloric acid was added. 0.04 parts by mass of carbon nanotubes are dispersed in the chitosan solution under ultrasonic (100W power); under 800rpm stirring speed, the chitosan solution containing carbon nanotubes is added dropwise in the sodium carboxymethyl cellulose solution to obtain chitosan The sugar / sodium carboxymethylcellulose-carbon nanotube nanocomposite was washed with absolute ethanol and dried at 60°...

Embodiment 2

[0021] 25 parts by mass of sodium carboxymethylcellulose were vacuum-dried at 80°C for 6 hours, and 10 parts by mass of sodium carboxymethylcellulose after drying was dissolved in 10,000 parts by mass of water at a magnetic stirring speed of 300 rpm to form carboxymethylcellulose Sodium solution, add 2.5 parts by mass of hydrochloric acid. 20 parts by mass of chitosan were vacuum-dried at 80° C. for 6 hours, 10 parts by mass of dried chitosan was dissolved in 10,000 parts by mass of water at a magnetic stirring speed of 300 rpm to form a chitosan solution, and 2.5 parts by mass of hydrochloric acid was added. 2.5 parts by mass of carbon nanotubes are dispersed in the chitosan solution under ultrasonic (100W power); under 800rpm stirring speed, the chitosan solution containing carbon nanotubes is added dropwise in the sodium carboxymethyl cellulose solution to obtain chitosan The sugar / sodium carboxymethylcellulose-carbon nanotube nanocomposite was washed with absolute ethanol ...

Embodiment 3

[0023] 1 mass part of sodium polyacrylate was vacuum-dried at 60°C for 8 hours, 0.5 mass part of dried sodium polyacrylate was dissolved in 200 mass parts of water at a magnetic stirring speed of 300 rpm to prepare a sodium polyacrylate solution, and 0.08 mass part of hydrochloric acid was added. 0.8 parts by mass of polyallylamine was vacuum-dried at 60°C for 8 hours, and 0.4 parts by mass of the dried polyallylamine was dissolved in 200 parts by mass of water at a magnetic stirring speed of 300 rpm to form a polyallylamine solution. 0.08 parts by mass of hydrochloric acid was added. 0.04 parts by mass of carbon nanotubes are dispersed in the polyallylamine solution under ultrasonic (100W power); under 800rpm stirring speed, the polyallylamine solution containing carbon nanotubes is added dropwise in the sodium polyacrylate solution to obtain polyacrylic acid. The allylamine / sodium polyacrylate-carbon nanotube nanocomposite was washed with absolute ethanol and dried at 70° C....

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Abstract

The invention discloses a preparation method of a polyelectrolyte-carbon nanotube nanocomposite separation membrane. The preparation method comprises the following steps of: drying anionic polyelectrolyte and cationic polyelectrolyte in vacuum, then respectively dissolving into water, and adding hydrochloric acid; dispersing a carbon nanotube in a cationic polyelectrolyte solution under the stirring and ultrasonic conditions; dripping the cationic polyelectrolyte solution dispersed with the carbon nanotube into an anionic polyelectrolyte solution under the stirring and ultrasonic conditions to obtain a series of polyelectrolyte-silicon dioxide nanocomposites; drying the polyelectrolyte-silicon dioxide nanocomposites in vacuum and then adding into water together with sodium hydroxide, stirring, dissolving, standing, defoaming and then obtaining a membrane casting solution; evenly scraping the membrane casting solution of the sodium polyelectrolyte-silicon dioxide nanocomposites onto a polyacrylonitrile porous membrane, and drying to obtain the polyelectrolyte-carbon nanotube nanocomposite separation membrane. The invention has cheap and easily-obtained raw materials, simple preparation method and excellent mechanical and separation properties.

Description

technical field [0001] The invention relates to the fields of preparation of polyelectrolyte nanomaterials and membrane separation, in particular to a method for preparing a high-performance polyelectrolyte-carbon nanotube nanocomposite pervaporation membrane. Background technique [0002] Combining inorganic nanomaterials with organic polymer materials can improve the thermodynamic stability and mechanical strength of polymer materials. Inorganic nano-polymer composite membrane is a new research direction in the field of membrane separation. Among many polymer nano-hybrid materials, the research on carbon nanotubes as polymer nano-fillers has lasted for a long time. Due to the unique physical and chemical properties and potential application prospects of carbon nanotubes, people are paying more and more attention to them. At present, the application of carbon nanotubes in many aspects such as high-performance materials, energy utilization, and catalysis has been studied i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/00B01D69/12B01D61/36
Inventor 安全福刘涛赵强钱锦文
Owner ZHEJIANG UNIV
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