Anti-biological pollution ultrafiltration membrane based on quaternary ammonium salt composite layered double hydroxide and preparation method thereof

A technology of anti-biological pollution and double hydroxide, which is applied in the field of membrane separation, can solve limitations and other problems, and achieve the effects of high hydrophilicity, environmentally friendly preparation process, and easy industrial scale-up

Active Publication Date: 2022-07-22
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above applications are all limited to the conventional performance of LDH, which makes the use of LDH still have certain limitations

Method used

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  • Anti-biological pollution ultrafiltration membrane based on quaternary ammonium salt composite layered double hydroxide and preparation method thereof
  • Anti-biological pollution ultrafiltration membrane based on quaternary ammonium salt composite layered double hydroxide and preparation method thereof
  • Anti-biological pollution ultrafiltration membrane based on quaternary ammonium salt composite layered double hydroxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of quaternary ammonium salt composite LDH nanosheets: According to the weight ratio of quaternary ammonium salt to LDH nanosheets of 1:2, take 0.2g of cetyltrimethylammonium bromide and 0.4g of MgAl-LDH to disperse In deionized water, the mixture was stirred at room temperature for 8 h, centrifuged, washed and dried to obtain MgAl-LDH nanosheets composited with cetyltrimethylammonium bromide.

[0035] (2) Preparation of casting solution: the weight ratio of quaternary ammonium salt composite LDH nanosheets to polyethersulfone powder is 1:30, the weight ratio of quaternary ammonium salt composite LDH nanosheets to porogen is 1:8, and the quaternary ammonium salt composite LDH nanosheets to porogen The weight ratio of the salt composite LDH nanosheets to the solvent is 1:127, taking 0.6wt% cetyltrimethylammonium bromide composite MgAl-LDH, 18wt% polyethersulfone powder and 5wt% polyvinylpyrrolidone ( Molecular weight of 58000 Da) was added to 76.4 wt% N-me...

Embodiment 2

[0039] (1) Preparation of quaternary ammonium salt composite LDH nanosheets: According to the weight ratio of quaternary ammonium salt to LDH nanosheets of 1:1, take 0.3g of cetyltrimethylammonium bromide and 0.3g of MgAl-LDH to disperse In deionized water, the mixture was stirred at room temperature for 8 h, centrifuged, washed and dried to obtain MgAl-LDH nanosheets composited with cetyltrimethylammonium bromide.

[0040](2) Preparation of casting solution: the weight ratio of quaternary ammonium salt composite LDH nanosheets to polyethersulfone powder is 1:30, the weight ratio of quaternary ammonium salt composite LDH nanosheets to porogen is 1:8, and the quaternary ammonium salt composite LDH nanosheets to porogen The weight ratio of the salt composite LDH nanosheets to the solvent is 1:127, taking 0.6wt% cetyltrimethylammonium bromide composite MgAl-LDH, 18wt% polyethersulfone powder and 5wt% polyvinylpyrrolidone ( Molecular weight of 58000 Da) was added to 76.4 wt% N-met...

Embodiment 3

[0044] (1) Preparation of quaternary ammonium salt composite LDH nanosheets: According to the weight ratio of quaternary ammonium salt to LDH nanosheets of 2:1, take 0.4g of cetyltrimethylammonium bromide and 0.2g of MgAl-LDH to disperse In deionized water, the mixture was stirred at room temperature for 8 h, centrifuged, washed and dried to obtain MgAl-LDH nanosheets composited with cetyltrimethylammonium bromide.

[0045] (2) Preparation of casting solution: the weight ratio of quaternary ammonium salt composite LDH nanosheets to polyethersulfone powder is 1:30, the weight ratio of quaternary ammonium salt composite LDH nanosheets to porogen is 1:8, and the quaternary ammonium salt composite LDH nanosheets to porogen The weight ratio of the salt composite LDH nanosheets to the solvent is 1:127, taking 0.6wt% cetyltrimethylammonium bromide composite MgAl-LDH, 18wt% polyethersulfone powder and 5wt% polyvinylpyrrolidone ( Molecular weight of 58000 Da) was added to 76.4 wt% N-me...

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Abstract

The invention discloses an anti-biological pollution ultrafiltration membrane based on quaternary ammonium salt composite layered double hydroxide (LDH) and a preparation method thereof. The preparation method comprises the following steps: firstly, embedding quaternary ammonium salt into interlayer gaps of LDH nanosheets, then blending the quaternary ammonium salt composite LDH nanosheets, a pore-foaming agent, polyether sulfone powder and a solvent to prepare a membrane casting solution, coating non-woven fabric with the membrane casting solution by using a scraper, and finally immersing the non-woven fabric coated with the membrane casting solution into deionized water for phase inversion, so as to obtain the membrane. The ultrafiltration membrane based on the quaternary ammonium salt composite layered double hydroxide is formed. According to the method, the quaternary ammonium salt and the LDH nanosheets are cheap and easy to obtain, based on microbial cell puncture of the LDH nanosheets and the intracellular release sterilization effect of the quaternary ammonium salt, the obtained ultrafiltration membrane has excellent antibacterial activity and biological pollution resistance, and the quaternary ammonium salt composite LDH nanosheets can also effectively enhance the hydrophilicity, water flux and organic pollution resistance of the membrane; according to the invention, the traditional phase inversion membrane preparation process is not changed, and the quaternary ammonium salt composite LDH nanosheet is simple and convenient to synthesize, cheap in material and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an anti-biological pollution ultrafiltration membrane based on a quaternary ammonium salt composite layered double hydroxide and a preparation method thereof. Background technique [0002] Ultrafiltration membrane separation is widely used in water treatment and is an important technology to deal with water shortage. Membrane fouling, especially biological fouling caused by the adhesion / reproduction of microorganisms on the membrane surface or in the membrane pores, can significantly reduce the water production capacity of ultrafiltration membranes and usually requires frequent chemical cleaning to deal with it. Frequent chemical cleaning may reduce the useful life of membranes and at the same time increase the operating costs of UF water treatment. [0003] The preparation of quaternary ammonium salt-based blend membranes can control the rate of biologic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/14B01D71/68
CPCB01D67/0079B01D69/02B01D61/145B01D71/02B01D71/68B01D2325/48B01D2325/36Y02A20/131
Inventor 戴若彬王志伟邱智伟陈简素璇
Owner TONGJI UNIV
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