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A kind of hydrophilic/hydrophobic conversion polyelectrolyte/titanium dioxide composite nanofiltration membrane and its preparation method

A composite nanofiltration membrane and polyelectrolyte technology, applied in the field of hydrophilic/hydrophobic conversion composite nanofiltration membrane and its preparation, and composite nanofiltration membrane, to achieve the effect of easy operation

Active Publication Date: 2017-05-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to make the same membrane not only realize the nanofiltration separation of its aqueous solution system, but also realize the solvent-resistant nanofiltration separation of non-aqueous organic solvent system is still a challenge.

Method used

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  • A kind of hydrophilic/hydrophobic conversion polyelectrolyte/titanium dioxide composite nanofiltration membrane and its preparation method
  • A kind of hydrophilic/hydrophobic conversion polyelectrolyte/titanium dioxide composite nanofiltration membrane and its preparation method
  • A kind of hydrophilic/hydrophobic conversion polyelectrolyte/titanium dioxide composite nanofiltration membrane and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of pre-assembled layers

[0026] First, immerse the pretreated ultrafiltration base membrane with a negative charge on the surface in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 20 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 20 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;

[0027] (2) Hydrophilic polyelectrolyte / TiO 2 Preparation of Composite Nanofiltration Membrane

[0028] The pre-assembled layer prepared in step (1) was soaked in a concentration of 0.15g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after 20min, fu...

Embodiment 2

[0033] (1) Preparation of pre-assembled layers

[0034] First, immerse the pretreated ultrafiltration base membrane with a negative charge on the surface in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 30 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 30 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;

[0035] (2) Polyelectrolyte / TiO 2 Preparation of Composite Nanofiltration Membrane

[0036] The pre-assembled layer prepared in step (1) was soaked in a concentration of 0.10g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after 30min, fully wash w...

Embodiment 3

[0043] (1) Preparation of pre-assembled layers

[0044] First, immerse the ultrafiltration base membrane with a negative charge on the surface after pretreatment in a cationic polyelectrolyte solution with a concentration of 5.0 g / L, assemble the cationic polyelectrolyte, take it out for 15 minutes, and wash it fully with deionized water; then soak the membrane Assemble the anionic polyelectrolyte in an anionic polyelectrolyte solution with a concentration of 5.0 g / L, take it out for 15 minutes, and wash it fully with deionized water, so that the obtained pair of cationic polyelectrolyte and anionic polyelectrolyte are used as a pre-assembled layer;

[0045] (2) Hydrophilic polyelectrolyte / TiO 2 Preparation of Composite Nanofiltration Membrane

[0046] The pre-assembled layer prepared in step (1) is soaked in a concentration of 0.05g / L positively charged titanium dioxide (TiO 2 ) The concentration of nanoparticles is 5.0g / L in the cationic polyelectrolyte, take it out after ...

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Abstract

The invention discloses a hydrophilic / hydrophobic transition polyelectrolyte / titanium dioxide composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membranes. According to the key technology, PDDA-TiO2 nano particles, cationic polyelectrolyte and anionic polyelectrolyte are utilized, ultrafiltration membranes such as polysulfone and polyacrylonitrile serve as supporting base membranes, and the composite nanofiltration capable of conducting hydrophilic / hydrophobic intelligent transition is prepared by adopting the method of combining ion exchange and electrostatic layer-by-layer self-assembly. The method is easy to operate and is a green preparation method, and the obtained composite nanofiltration membrane is even in structure; meanwhile, the prepared hydrophilic / hydrophobic transition composite nanofiltration membrane can be used for removing water and dye, such as xylenol orange and methyl blue, of an organic solvent system, and a good application effect is achieved.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane capable of realizing hydrophilic / hydrophobic conversion at the same time, in particular to a hydrophilic / hydrophobic conversion composite nanofiltration membrane realized by a counter ion exchange method and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Due to its special charging performance and "nano-scale pores", nanofiltration membranes can effectively intercept organic substances with a molecular weight cut-off of about 150-500 and salt ions above divalent, so they are widely used in hard water softening, removal of a small amount of organic substances in water, Dye purification and desalination, separation and purification of organic substances with different molecular weights and many other industrial fields. For the separation system using water as the solvent, conventional nanofiltration membranes can be used. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/02B01D69/12B01D67/00
Inventor 秦振平任晓燕郭红霞王乃鑫张国俊
Owner BEIJING UNIV OF TECH
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