GO-PSF composite film selection layer and preparation method and application thereof

A selective layer and composite membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of reducing membrane flux and not using MBR

Pending Publication Date: 2021-04-06
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, composite thin film technology (spin coating, interfacial polymerization, etc.) will reduce the pore size of the base membrane and reduce the membrane flux, so it is not used for MBR

Method used

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  • GO-PSF composite film selection layer and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dry polysulfone in a vacuum oven at 80°C for 10 hours, mix polysulfone (10wt%), GO (0.025 wt%) and solvent dimethylacetamide into the Erlenmeyer flask, apply ultrasonic waves for 120min, and stir with magnetic force at room temperature Dissolve until the dissolved casting solution turns transparent gray, and let it stand for 10 hours. The commercial film (PSF) soaked in glycerol was taken out, and a film was formed on the PSF base film using a 50um and 100um scraper.

Embodiment 2

[0034] Carry out the anti-fouling experiment, and use the diaphragm pump to run for 4-5 hours, so that the membrane is quickly fouled, and the flux is reduced to 66.67% of the initial flux. Prepare 0.2% sodium hypochlorite solution, backwash for 2 minutes, and continue to test the water flux. The flux of the unmodified membrane rises to 77.83% of the initial flux; the flux of the 50um GO-PSF membrane rises to 50% of the initial flux. 88.83%, the flux of 100um GO-PSF membrane rose to the sum of 92.37% of the initial flux. It can be seen that through the preparation of GO-PSF composite membrane, the anti-fouling performance of the membrane is improved.

Embodiment 3

[0036] The dry commercial membrane (PSF) was taken out, and the GO-PSF casting solution was used to form a membrane on the PSF base membrane with a scraper, and the prepared membrane was installed in the pressure filtration experimental device, and the membrane flux was tested by water filtration under a pressure of 0.5 MPa. Compared with the basement membrane, it has decreased by 85.5%, indicating that the membrane pores are seriously blocked and are no longer suitable for MBR.

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Abstract

The invention discloses a preparation method of a GO-PSF composite membrane selection layer, which comprises the following steps: adding polysulfone particles into a dimethylacetamide solution, adding GO particles, carrying out ultrasonic treatment, and carrying out magnetic stirring until the membrane casting solution is grey and transparent; soaking the base membrane in glycerol, and storing for later use; taking out the base membrane, removing redundant glycerol on the surface of the membrane, and keeping the surface of the membrane dry; and forming a membrane on the surface of the treated base membrane by using the membrane casting solution by using a phase inversion method, cleaning, and storing in deionized water. According to the GO-PSF composite film prepared by the invention, the hydrophilicity, the antibacterial property and the anti-pollution capability are improved, and compared with a GO-PSF blended film, the cost is reduced.

Description

technical field [0001] The invention relates to a GO-PSF composite membrane selective layer, a preparation method and application thereof, and belongs to the technical field of sewage treatment. Background technique [0002] Membrane bioreactor (MBR) has become one of the most popular wastewater treatment technologies today. It integrates the biodegradation of pollutants and the membrane separation of microorganisms. The main advantages of MBR are small footprint, low concentration of pollutant discharge, stable operation and good water quality. [0003] MBR will be polluted by microorganisms to varying degrees during operation. Microbial pollution mainly refers to the adsorption and accumulation of microorganisms and their metabolites on the membrane surface to form biofilms. After the microorganisms are adsorbed, they grow and multiply rapidly in the membrane and on the surface of the membrane, resulting in a decrease in the membrane flux. Frequent backwashing is required...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/02B01D69/12B01D69/02B01D67/00C02F3/12
CPCB01D71/68B01D71/021B01D69/12B01D69/02B01D67/0079C02F3/1268B01D2325/48B01D2325/36B01D2323/35B01D2323/08B01D2323/12Y02W10/10
Inventor 周政忠许鑫悦吴琦刚郑涛袁浩然呼和涛力
Owner CHANGZHOU UNIV
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