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Preparation method of high-performance reverse osmosis membrane for promoting growth of polyamide nano vesicles

A nanovesicle, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as death and human dehydration

Active Publication Date: 2020-10-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once a person drinks this high-concentration water for a long time, it will lead to extreme dehydration of the human body and eventually lead to death

Method used

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  • Preparation method of high-performance reverse osmosis membrane for promoting growth of polyamide nano vesicles
  • Preparation method of high-performance reverse osmosis membrane for promoting growth of polyamide nano vesicles
  • Preparation method of high-performance reverse osmosis membrane for promoting growth of polyamide nano vesicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 2.2 wt% of m-phenylenediamine was dissolved in ultrapure water, 4 wt% of camphorsulfonic acid was added, and an appropriate amount of triethylamine was added to adjust the pH of the aqueous phase solution to 10.0. After adding 0.01 wt% potassium perfluorobutane sulfonate, a magnetic stirrer was used to disperse the solute molecules in the aqueous phase solution uniformly to obtain a clear aqueous phase solution. 0.11wt% trimesoyl chloride was added to the Isopar-G oil phase solvent, and it was sonicated with an ultrasonic instrument to obtain a clear and transparent oil phase solution.

[0077] Pour the above-prepared aqueous phase solution on the surface of the polysulfone ultrafiltration membrane, let it stand for 2 minutes, pour off the excess water phase on the surface of the polysulfone ultrafiltration membrane, and use a nitrogen air knife to purge the surface of the polysulfone ultrafiltration membrane to remove Water drops and droplets. Subsequently, the above ...

Embodiment 2

[0079] The preparation steps of the membrane were repeated in Example 1, the only difference being that "during the preparation of the aqueous phase solution, the concentration of potassium perfluorobutanesulfonate was replaced by 0.05wt%", and the rest of the steps were the same as in Example 1, and the final preparation A polyamide reverse osmosis membrane is obtained. The film number is designated as M-0.05.

Embodiment 3

[0081] The preparation steps of the membrane were repeated in Example 1, the only difference being that "during the preparation of the aqueous phase solution, the concentration of potassium perfluorobutane sulfonate was replaced by 0.1 wt%", and the rest of the steps were the same as in Example 1, and the final preparation A polyamide reverse osmosis membrane is obtained. The film number is designated as M-0.1.

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Abstract

The invention discloses a preparation method of a high-performance reverse osmosis membrane for promoting the growth of polyamide nano vesicles. A polysulfone ultrafiltration membrane is selected as asupport bottom membrane, and interfacial polymerization reaction of a water-phase amine monomer and an oil-phase polybasic acyl chloride monomer is carried on the surface of the support bottom membrane to compound with a polyamide ultrathin layer, thereby forming a reverse osmosis membrane; and the permeation selectivity of the reverse osmosis membrane is optimized by regulating and controlling parameter conditions in the interfacial polymerization process. On the basis, potassium perfluorobutyl sulfonate is introduced into an aqueous phase solution to promote the growth of polyamide nano vesicles supporting the surface of the bottom membrane and increase the surface roughness of the membrane, so that the permeation flux of the membrane is improved, and the performance of the reverse osmosis membrane is further optimized. According to the reverse osmosis membrane prepared by the method, the permeation flux of the membrane can be remarkably improved while the salt rejection rate is notlost. The invention provides a new reference way for development of a polyamide reverse osmosis membrane with high rejection rate and high flux.

Description

technical field [0001] The invention relates to a method for preparing a high-performance reverse osmosis membrane to promote the growth of polyamide nanovesicles. Background technique [0002] The earth is rich in water resources, but the water from low-lying oceans accounts for 96.54%. The concentration of inorganic salts in seawater is as high as 3.5%, and there are a large number of bacteria and microorganisms in it. Once people drink this high-concentration water for a long time, it will lead to extreme dehydration of the human body and eventually lead to death. The fresh water resources that can be used by people on the earth account for only 2.53% of the total water volume. It is a major challenge to turn desalination of seawater into water that people can drink. In addition, the current problem of environmental water pollution is becoming more and more serious. For example, the waste liquid discharged from chemical plants needs to be purified and discharged to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00B01D61/02
CPCB01D71/64B01D69/02B01D67/0006B01D61/025B01D2325/36
Inventor 宋潇潇胡向阳周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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