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Preparation method of anti-pollution ultrafiltration membrane

An ultrafiltration membrane and anti-pollution technology, applied in the field of ultrafiltration membranes, can solve the problems of easy pollution, fast decay, membrane pollution, etc., and achieve the effects of improving anti-pollution ability, improving performance, and improving pure water flux.

Active Publication Date: 2021-09-07
HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophilicity of most ultrafiltration membranes is not good at present, so the membrane fouling problem is serious during use, resulting in low flux and fast attenuation of ultrafiltration membranes, and easy contamination, which greatly limits the application of ultrafiltration membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A process for preparing ultrafiltration membranes stain, comprising the steps of:

[0027] Sl, the polyether sulfone 1g, 1g of the polyimide was dissolved in a concentration of 5% by mass sulfuric acid solution was acidified 5h, filtered and dried; then placed in a solution of sodium carbonate concentration of 10% by mass, the immersion 2h, filtered after washing and drying; then treatment polyether sulfone, a polyimide was added to 10gN, N- dimethylformamide, at a rate of 600r / min was stirred 6h, to give a first solution;

[0028] S2, the modified nano 0.02g of lanthanum oxide, cerium oxide modified nano 0.03g added to the first solution, prior to the temperature of 30 deg.] C at a stirring rate of 600r / min was stirred for 4h, then at a frequency of 60KHz ultrasonic 20min, the vacuum degree under 0.01Mpa, vacuum defoaming 30min to give a second solution;

[0029] S3, the second solution was poured on a glass plate with a doctor blade scraped nascent membrane, the nasce...

Embodiment 2

[0034] A process for preparing ultrafiltration membranes stain, comprising the steps of:

[0035] Sl, the polyether sulfone 1g, 2g mass of the polyimide was dissolved at a concentration of 8% sulfuric acid solution was acidified 5h, filtered and dried; then placed in a solution of sodium carbonate concentration of 12% by mass, the immersion 2h, filtered after washing and drying; then treatment polyether sulfone, a polyimide was added to 12gN, N- dimethylformamide, at a rate of 600r / min was stirred 6h, to give a first solution;

[0036] S2, the modified nano 0.03g of lanthanum oxide, cerium oxide modified nano 0.04g added to the first solution, prior to the temperature of 35 ℃ stirring rate at 700r / min was stirred for 5h, and then at a frequency of 70KHz ultrasonic 25min, the vacuum degree under 0.03Mpa, vacuum defoaming 45min to give a second solution;

[0037] S3, the second solution was poured on a glass plate with a doctor blade scraped nascent membrane, the nascent membran...

Embodiment 3

[0042] A process for preparing ultrafiltration membranes stain, comprising the steps of:

[0043] Sl, the polyether sulfone 1g, 3g concentration of soluble polyimide solution was acidified 5h 10% sulfuric acid, filtered and dried; then placed in a solution of sodium carbonate concentration of 15% by mass, the immersion 2h, filtered after washing and drying; then treatment polyether sulfone, a polyimide was added to 10gN, N- dimethylformamide, at a rate of 600r / min was stirred 6h, to give a first solution;

[0044] S2, the modified nano 0.05g of lanthanum oxide, cerium oxide modified nano 0.06g added to the first solution, prior to the temperature of 40 ℃ stirring rate at 800r / min was stirred for 6h, then at a frequency of 80KHz ultrasonic 25min, the vacuum degree under 0.05Mpa, vacuum defoaming 60min to give a second solution;

[0045] S3, the second solution was poured on a glass plate with a doctor blade scraped nascent membrane, the nascent membrane was allowed to stand bef...

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Abstract

The invention proposes a method for preparing an anti-pollution ultrafiltration membrane. By adding modified nano-lanthanum oxide and modified nano-cerium oxide to the film-forming material, the modified nano-lanthanum oxide and modified nano-cerium oxide have a large The specific surface area can improve the performance of the ultrafiltration membrane, and both lanthanum oxide and cerium oxide are rare earth oxides. Applying them to the ultrafiltration membrane can greatly improve the pure water flux of the ultrafiltration membrane and the flux recovery rate is high. Experiments have shown that the pure water flux of the ultrafiltration membrane prepared by adding modified nano-lanthanum oxide and modified nano-cerium oxide can reach more than 170L / m2 h, and the flux recovery rate can reach more than 90%. greatly improved; the present invention adds modified nano-lanthanum oxide and modified nano-cerium oxide, there is a synergistic effect between these two oxides, compared with a single ultrafiltration membrane prepared by adding nano-lanthanum oxide or nano-cerium oxide. Water flux is greatly improved.

Description

Technical field [0001] The present invention relates to membrane technology, and in particular relates to a method for preparing an ultrafiltration membrane contamination. Background technique [0002] Polymer membrane ultrafiltration membrane is one of the earliest developed in the 1960s ultrafiltration device to achieve industrialization. Ultrafiltration membrane of a wide range of industrial applications, has become one of the new chemical unit operations. Ultrafiltration membrane technology is widely used in various separation and purification process electronic, chemical, pharmaceutical, food and other industries. However, at present most of the hydrophilic membrane is not good, so in the course of the film serious pollution problems, leading to low membrane flux and decay quickly, easily contaminated, which greatly limits the application of ultrafiltration membranes. [0003] Based on this, it is necessary to provide a method for preparing a stain ultrafiltration membrane. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/68
CPCB01D67/0093B01D69/02B01D69/12B01D71/68B01D2323/08B01D2323/10B01D2325/36
Inventor 陈泉学
Owner HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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