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Strong anti-pollution composite gradient ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane, anti-pollution technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of low flux recovery rate, low separation efficiency, blocked membrane pores, etc., and achieve simple and repeatable preparation process. Good, high water flux effect

Active Publication Date: 2020-08-28
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a strong anti-pollution composite gradient ultra- Filter membrane and its preparation method

Method used

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  • Strong anti-pollution composite gradient ultrafiltration membrane and preparation method thereof
  • Strong anti-pollution composite gradient ultrafiltration membrane and preparation method thereof
  • Strong anti-pollution composite gradient ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Grafting Fe on the surface of GO 3 o 4 : In an aqueous solution, 50 mg of graphene oxide GO was uniformly dispersed by ultrasound to prepare a 1 mg / mL GO dispersion, then 0.25 g of NHS / EDC catalyst was added, and stirred at 20°C for 30 min. Then add 50mg of Fe 3 o 4 , stirred at room temperature for 24 hours, centrifuged, washed with water, and dried to obtain GO-Fe 3 o 4 nanohybrid.

[0033] Preparation of PSf-based composite gradient ultrafiltration membrane: 0.3wt% GO-Fe 3 o 4 , 0.3wt% FAS was ultrasonically uniformly dispersed in DMAc (N,N-dimethylacetamide) solution with a concentration of 19% polysulfone PSf, and 3% PVP-K30 porogen was added at the same time. After defoaming for 8 hours, pour the casting solution on the glass plate, scrape the film, and control the thickness to 200 μm, then place the NdFeB permanent magnet with a coercive force of 868KA / m at 5cm above the glass plate, and then place it 60s later. The glass plate was immersed in deionized w...

Embodiment 2

[0036] Grafting Fe on the surface of GO 3 o 4 : In an aqueous solution, 50 mg of graphene oxide GO was uniformly dispersed by ultrasound to prepare a 1 mg / mL GO dispersion, then 0.25 g of NHS / EDC catalyst was added, and stirred at 20°C for 30 min. Then add 50mg of Fe 3 o 4 , stirred at room temperature for 24 hours, centrifuged, washed with water, and dried to obtain GO-Fe 3 o 4 nanohybrid.

[0037] Preparation of PSf-based composite gradient ultrafiltration membrane: 0.3wt% GO-Fe 3 o 4 , 0.3wt% FOS is ultrasonically uniformly dispersed in the DMAc solution with a concentration of 19% polysulfone PSf, and 3% PVP-K30 porogen is added at the same time. On the glass plate, scrape the film, the thickness is controlled at 200μm, then place the NdFeB permanent magnet with a coercive force of 868KA / m at 5cm above the glass plate, and then immerse the glass plate in deionized water for 60s to prepare PSf / GO-Fe 3 o 4 / FOS composite gradient ultrafiltration membrane. The pur...

Embodiment 3

[0039] GO surface grafted with CoFe 2 o 4 : In an aqueous solution, 50 mg of graphene oxide GO was uniformly dispersed by ultrasound to prepare a 1 mg / mL GO dispersion, then 0.25 g of NHS / EDC catalyst was added, and stirred at 20°C for 30 min. Then add 50mg of CoFe 2 o 4 , stirred at room temperature for 24 hours, centrifuged, washed with water, and dried to obtain GO-CoFe 2 o 4 nanohybrid.

[0040] Preparation of PSf-based composite gradient ultrafiltration membrane: 0.3wt% GO-CoFe 2 o 4 , 0.3wt% FAS is ultrasonically dispersed in a DMAc solution with a concentration of 19% polysulfone PSf, and 3% PEG2000 porogen is added at the same time. On the scraping film, the thickness is controlled at 200 μm, and then a NdFeB permanent magnet with a coercive force of 868KA / m is placed 5cm above the glass plate, and the glass plate is immersed in deionized water after 60s to prepare PSf / GO -CoFe 2 o 4 / FAS composite gradient ultrafiltration membrane. The pure water flux of th...

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Abstract

The invention discloses a strong anti-pollution composite gradient ultrafiltration membrane and a preparation method thereof. According to the ultrafiltration membrane, magnetic nanoparticles are chemically bonded to the surface of graphene oxide to form a graphene oxide-magnetic nanoparticle hybrid; and then the graphene oxide-magnetic nanoparticle hybrid, organofluorosilane and a pore-foaming agent are uniformly dispersed in a polymer polysulfone PSf solution, and a solution casting film-forming method is adopted to prepare the through magnetic field assisted non-solvent induced phase inversion. The defects that in the ultrafiltration separation process of a traditional polymer membrane material, organic pollutants are prone to adhesion, membrane holes are blocked, the separation efficiency is low, cleaning is not easy, and the flux recovery rate is low can be overcome.

Description

technical field [0001] The invention belongs to the technical field of functional high-resolution membrane materials, and specifically relates to a gradient ultrafiltration membrane based on magnetic field induction and in-situ hydrolysis and a preparation method thereof, that is, a strong anti-pollution composite gradient ultrafiltration membrane and a preparation method thereof. Background technique [0002] The security and scarcity of water resources have been recognized as one of the important factors for basic human survival and global development. Nearly 80% of wastewater is discharged directly without treatment worldwide, seriously threatening human health and natural ecosystems. Traditional water purification technologies such as flocculation, adsorption, and distillation have severely limited their practical applications due to their complex processes, high energy consumption, and high cost. In order to pursue a more economical and practical high-efficiency water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/06B01D71/02B01D69/12B01D67/00B01D61/14C02F1/44
CPCB01D71/021B01D71/68B01D71/024B01D71/02B01D71/06B01D69/12B01D67/0079B01D61/145C02F1/444B01D2325/46Y02A20/131
Inventor 王炳涛胡盈盈滕志伟舒婷
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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