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Modified separation membrane for membrane distillation, and preparation method and application thereof

A separation membrane and membrane distillation technology, which is applied in semipermeable membrane separation, chemical instruments and methods, and membranes, can solve problems such as easy wetting and easy pollution of separation membranes, and achieve high salt cut-off rate, stable permeation flux, The effect of broadening the modification pathway

Active Publication Date: 2020-05-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a modified separation membrane for membrane distillation in view of the defects and deficiencies of the separation membrane used in membrane distillation that are easy to pollute and wet easily in the prior art

Method used

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  • Modified separation membrane for membrane distillation, and preparation method and application thereof
  • Modified separation membrane for membrane distillation, and preparation method and application thereof
  • Modified separation membrane for membrane distillation, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A modified separation membrane for membrane distillation, the specific modification process is as follows:

[0048] (1) Fix a commercially dry polyvinylidene fluoride diaphragm (0.45 μm) on a metal clamp with a diameter of 14 cm, and perform surface plasma activation on the diaphragm, with a power of 28w and an irradiation time of 10 minutes;

[0049] (2) Dissolve 0.440g of sodium acetate and 0.428g of sodium periodate in 100mL of pure water, and adjust the pH to 5.0, add 0.1g of dopamine and stir for 2 minutes, and use the prepared solution to perform single-phase reaction on the activated polyvinylidene fluoride membrane. For the coating of the hydrophilic layer, the whole system was reacted on a shaker at 30 rpm for 2 hours. And rinse with deionized water for 5 minutes;

[0050] (3) Configure 1% polyethyleneimine (molecular weight: 800Da) solution, adjust pH=5.0, coat the membrane with polycation electrolyte solution, and react the whole system on a shaker at 30 rpm...

Embodiment 2

[0054] A modified separation membrane for membrane distillation, the specific modification process is as follows:

[0055] (1) Dissolve 10 g of chitosan powder and 10 mL of glacial acetic acid in 1 L of pure water, and keep stirring until the chitosan is completely dissolved.

[0056] (2) Fix a commercially dry polyvinylidene fluoride diaphragm (0.45 μm) on a metal clamp with a diameter of 14 cm, and perform surface plasma activation on the diaphragm, with a power of 28w and an irradiation time of 10 minutes;

[0057] (3) Dissolve 0.440g sodium acetate, 0.428g sodium periodate, and 40mL chitosan solution in 60mL pure water, and adjust the pH to 5.0, add 0.1g catechol and stir for 2 minutes, and use the prepared solution to The activated polyvinylidene fluoride membrane is coated with a hydrophilic layer on one side, and the whole system is reacted on a shaker at 30 rpm for 2 hours, and rinsed with deionized water for 5 minutes;

[0058] (4) Configure 1% polyethyleneimine (mol...

Embodiment 3

[0062] Example 3 adopts the same preparation method as that of Example 2, except that the molecular weight of polyethyleneimine is 750,000Da.

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Abstract

The invention discloses a modified separation membrane for membrane distillation, and a preparation method and an application thereof. The modified separation membrane is prepared by the following steps: S1, performing surface activation on a polyvinylidene fluoride hydrophobic membrane, and preparing a dopamine solution or a plant polyphenol-chitosan solution; S2, performing surface hydrophilic layer coating modification on an activated polyvinylidene fluoride hydrophobic membrane by adopting the dopamine solution or the plant polyphenol-chitosan solution, and carrying out cleaning with water; S3, immersing the polyvinylidene fluoride membrane modified in the step S2 into a polycation electrolyte solution for coating modification, and carrying out cleaning with water; and S4, circularly repeating the steps S2 and S3 for 1-4 times, then repeating the step S2, and carrying out cleaning so as to obtain the modified separation membrane. The modified separation membrane provided by the invention simultaneously has a super-hydrophilic surface layer and a hydrophobic mass transfer layer, can treat pollutants containing low surface energy and keep long-term stable operation, and has highsalt rejection rate, stable permeation flux and high effluent quality.

Description

technical field [0001] The invention relates to the technical field of separation membranes for membrane distillation, and more specifically, to a modified separation membrane for membrane distillation and its preparation method and application. Background technique [0002] Membrane distillation technology is a new type of membrane separation process that uses a hydrophobic microporous membrane as the separation medium (separation membrane) and uses the vapor pressure difference on both sides of the membrane as the driving force. Application prospects. Compared with other separation technologies, membrane distillation technology has unique advantages: 1) The membrane distillation process only allows water vapor to pass through and retains all non-volatile substances, which can almost 100% repel ions and non-volatile molecules, and produce high-quality water; 2) Compared with reverse osmosis, the membrane distillation process is not affected by the osmotic pressure of brine...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/34B01D69/02B01D67/00C02F1/44
CPCB01D67/009B01D67/0093B01D69/02B01D71/34B01D71/82B01D2325/36B01D2325/38C02F1/447Y02A20/131
Inventor 赵姗姗陶铸孟凡刚
Owner SUN YAT SEN UNIV
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