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Anti-crystallization hydrophobic modified membrane, and preparation method and application thereof

A hydrophobic modification and anti-crystallization technology, which can be used in general water supply conservation, chemical instruments and methods, membrane technology, etc.

Active Publication Date: 2021-08-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The primary purpose of the present invention is to overcome the problems of membrane fouling caused by concentrated crystallization and decrease in flux through the membrane caused by existing membrane modification technology in the process of membrane distilled water treatment, and to provide a method for preparing an anti-crystallization hydrophobic modified membrane

Method used

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  • Anti-crystallization hydrophobic modified membrane, and preparation method and application thereof

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Effect test

Embodiment 1

[0034] A method for preparing an anti-crystallization hydrophobically modified film, comprising the steps of:

[0035] S1. Fully dissolve polyvinylidene fluoride in a mixed solution of N,N-dimethylformamide and acetone. The volume ratio of N,N-dimethylformamide and acetone is 2:1 to obtain polyvinylidene fluoride Mass fraction is 13% solution as spinning solution;

[0036] S2. Electrospinning the spinning solution obtained in S1, the conditions are: the voltage is 15kV, the advancing speed is 1mL / h, the temperature is 25°C, and the relative humidity is 30%, to obtain the nanofiber base film;

[0037] S3. Place the nanofiber base film obtained in S2 in the chamber of a plasma surface cleaning machine for surface cleaning, the conditions are: power 150W, time 10min, vacuum degree is -100kPa, and air is introduced;

[0038] S4. Drop 240 μL of N,N-dimethylformamide and 60 μL of perfluoroalkyldimethylchlorosilane on the bottom of a sealable container, and then place the basement m...

Embodiment 2

[0040] The difference from Example 1 is that in this example, the base film obtained in step S3 was treated for 4 hours in an atmosphere where 255 μL of N,N-dimethylformamide and 45 μL of perfluoroalkyldimethylchlorosilane were heated and volatilized. , The volume ratio of N,N-dimethylformamide to perfluoroalkyldimethylchlorosilane is 17:3.

Embodiment 3

[0042] The difference from Example 1 is that this example uses 225 μL of N,N-dimethylformamide and 75 μL of perfluoroalkyldimethylchlorosilane; N,N-dimethylformamide and perfluoroalkyl The volume ratio of dimethylchlorosilane is 15:5.

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Abstract

The invention discloses an anti-crystallization hydrophobic modified membrane, and a preparation method and application thereof. The method comprises the following steps: placing a surface hydroxylated nanofiber base membrane in a closed environment with N, N-dimethylformamide and perfluoroalkyl dimethyl chlorosilane volatile atmosphere, and treating at 80-140 DEG C for 2-6 hours, wherein the volume ratio of the N, N-dimethylformamide to the perfluoroalkyl dimethyl chlorosilane is (14-18): (2-6). The membrane material is prepared by synchronously performing steam treatment and fluorination modification on the surface-hydroxylated nanofiber-based membrane, and the obtained membrane material has relatively strong anti-crystallization and anti-pollution properties, can maintain the original membrane flux, and can stably run for a long time in the treatment process of the high-salinity water membrane distilled water, slow down the membrane pollution speed, reduce the membrane cleaning cost and improve the water recovery efficiency.

Description

technical field [0001] The invention relates to the technical field of membrane distilled water treatment, and more particularly relates to an anti-crystallization hydrophobically modified membrane and its preparation method and application. Background technique [0002] The membrane distillation process is a membrane separation water treatment technology that uses a hydrophobic membrane as the separation medium and uses the vapor pressure difference on both sides of the membrane as the driving force. However, due to the limited performance of the membrane material, it has not been widely used. Membrane distillation is generally used to treat high-salinity sewage, or use it for desalination of seawater, but the existing membrane materials are easily polluted by inorganic salts in the water during the water treatment process, resulting in salt scale on the membrane surface, and membrane knots. The occurrence of scale will reduce the separation performance of the membrane and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00C02F1/44
CPCB01D71/82B01D69/02B01D67/0088B01D67/009C02F1/447B01D67/0093Y02A20/131
Inventor 黄裕熙梁冬晴孟凡刚
Owner SUN YAT SEN UNIV
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