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Method for preparing CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of CoFe-PBA@PVDF PVDF composite membrane

A technology of self-assembly and composite membranes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of uneven distribution of inorganic nanoparticles, membrane pollution, etc., achieve excellent antifouling performance, solve poor compatibility, good The effect of mechanical properties

Pending Publication Date: 2022-02-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of uneven distribution of inorganic nanoparticles in the membrane channel and membrane surface and membrane pollution by using delayed phase transition induced in-situ metal self-assembled membrane technology

Method used

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  • Method for preparing CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of CoFe-PBA@PVDF PVDF composite membrane
  • Method for preparing CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of CoFe-PBA@PVDF PVDF composite membrane
  • Method for preparing CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of CoFe-PBA@PVDF PVDF composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] PVDF 4.2g, PVP 0.1g, Co(NO 3 ) 2 ·6H 2 O 1g, DMAC with a volume of 30mL of casting solution was stirred evenly at 50°C, then left to remove air bubbles, scraped the film with a 200μm film scraper on a flat-panel film scraper, and quickly put potassium ferricyanide at a concentration of 30mg / mL, in a coagulation bath with DMAC:Water ratio of 1:4, phase inversion is achieved at room temperature. After the membrane is formed and the coordination of the surface inorganic particles is completed, the excess coagulation bath liquid on the surface and the unstable Prussian blue analog (PBA) on the surface are washed with deionized water, and soaked in deionized water for 12 hours to obtain CoFe-PBA@ The PVDF composite membrane is marked as M4.

[0028] The surface morphology characteristics of the prepared CoFe-PBA@PVDF composite film and the quartz film before modification were observed by scanning electron microscope (SEM). figure 1 is the SEM image of the prepared membr...

Embodiment 2

[0032] PVDF 4.2g, PVP 0.1g, Co(NO 3 ) 2 ·6H 2 O 0.5g, DMAC with a volume of 30mL of casting solution is stirred evenly at 50°C, and then left to remove air bubbles, scrape the film with a 200μm scraper on a flat-panel film scraper, and quickly add potassium ferricyanide at a concentration of 30mg / mL, in a coagulation bath with DMAC:Water ratio of 1:4, phase inversion is achieved at room temperature. After the membrane is formed and the coordination of the surface inorganic particles is completed, the excess coagulation bath liquid on the surface and the unstable Prussian blue analog (PBA) on the surface are washed with deionized water, and soaked in deionized water for 12 hours to obtain CoFe-PBA@ The PVDF composite membrane is marked as M3.

Embodiment 3

[0034] PVDF 4.2g, PVP 0.1g, Co(NO 3 ) 2 ·6H 2 O 1.5g, DMAC with a volume of 30mL of casting solution is stirred evenly at 50°C, then let it stand to remove air bubbles, scrape the film with a 200μm scraper on a flat-panel film scraper, and quickly add potassium ferricyanide at a concentration of 30mg / mL, in a coagulation bath with DMAC:Water ratio of 1:4, phase inversion is achieved at room temperature. After the membrane is formed and the coordination of the surface inorganic particles is completed, the excess coagulation bath liquid on the surface and the unstable Prussian blue analog (PBA) on the surface are washed with deionized water, and soaked in deionized water for 12 hours to obtain CoFe-PBA@ The PVDF composite membrane is marked as M5.

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Abstract

The invention belongs to the technical field of preparation of environmental functional materials, and discloses a method for preparing a CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of the CoFe-PBA@PVDF composite membrane. The PVDF composite membrane with efficient oil-water emulsion separation and anti-fouling properties is prepared by regulating and controlling the surface distribution of inorganic nanoparticles on the membrane and the pore size of the membrane. The obtained PVDF composite membrane has super-hydrophilicity, underwater super-oleophobicity, good water / oil separation performance, anti-fouling performance and self-cleaning function. The separation efficiency for oil-in-water emulsion corresponding to dichloroethane, petroleum ether, methylbenzene, soybean oil and normal hexane reaches up to 99.8%. The in-situ growth of PBA on the surface of the membrane can greatly reduce the blockage of the emulsion to pores and channels on the surface of the membrane by virtue of an advanced oxidation method of persulfate PMS. Due to the excellent catalytic performance of PBA, the composite membrane can effectively degrade organic dye. In an experiment of cross flow for 1 hour, the removal rate of MB is kept to be 99% or above.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a CoFe-PBA@PVDF composite membrane and a preparation method and application thereof. Background technique [0002] The shortage of water resources and the aggravation of water pollution are environmental problems that restrict the progress of human society and economic development. Sewage treatment is one of the important ways to realize the efficient utilization of water resources. Membrane treatment technology is widely used in various fields due to its advantages of energy saving and high cost performance. However, the surface fouling of the membrane has always been the bottleneck problem restricting the wide application of membrane technology. Therefore, improving the surface antifouling performance of the membrane is one of the main strategies to obtain high-performance membranes, and the microstructure and antifouling ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/12C02F1/44C02F1/72C02F101/30
CPCB01D71/34B01D67/0079B01D69/12C02F1/44C02F1/725B01D2325/36B01D2325/10B01D2325/24C02F2101/308
Inventor 王璐璐樊静秋刘杰叶健张瑞龙戴江栋
Owner JIANGSU UNIV
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