Efficient and stable magnetic nanofiber membrane and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-12427485-B2
Application number	US-202218055602-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	Mar 11, 2022
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

The present disclosure provides an efficient and stable magnetic nanofiber membrane and a preparation method and use thereof, and belongs to the technical field of composites. The preparation method includes the following steps: dissolving polyacrylonitrile or polystyrene, nZVI particles, and n-octyltrimethylammonium bromide in N,N-dimethylformamide, and mixing uniformly to obtain a spinning solution; subjecting the spinning solution to electrospinning; and vacuum-drying a resulting fiber membrane to obtain the efficient and stable magnetic nanofiber membrane. In the present disclosure, the magnetic nanofiber membrane has a high specific surface area, a desirable porosity, an excellent mechanical strength, and satisfactory magnetic properties. The membrane effectively exerts a synergistic effect of the nZVI particles and an organic polymer material carrier, avoids easy oxidation of a catalyst surface and easy particle agglomeration, enhances a catalytic activity of the magnetic nanofiber membrane, and improves an efficiency in organic wastewater treatment.

First claim

What is claimed is:

1. A preparation method of an efficient and stable magnetic nanofiber membrane, comprising the following steps:
dissolving polyacrylonitrile or polystyrene, nanoscale zero-valent iron (nZVI) particles, and n-octyltrimethylammonium bromide in N,N-dimethylformamide, and mixing uniformly to obtain a spinning solution; subjecting the spinning solution to low-temperature electrospinning using a receiver at −196° C. and −180° C.; and vacuum-drying a resulting fiber membrane to obtain the efficient and stable magnetic nanofiber membrane.

2. The preparation method according to claim 1 , wherein the polyacrylonitrile has an average molecular weight of 200,000 to 300,000, and the polystyrene has an average molecular weight of 40,000 to 50,000.

3. The preparation method according to claim 1 , wherein the spinning solution has 100 g/L to 350 g/L of the polyacrylonitrile or the polystyrene by concentration, has the nZVI particles and the polyacrylonitrile or the polystyrene at a mass ratio of (1-3):(3-4), and has 1 mmol/L to 2 mmol/L of the n-octyltrimethylammonium bromide.

4. The preparation method according to claim 1 , wherein the nZVI particles have a particle size of 10 nm to 100 nm.

5. The preparation method according to claim 1 , wherein during the electrospinning, the membrane is immersed in a low-temperature source of liquid nitrogen.

6. The preparation method according to claim 1 , wherein the electrospinning is conducted at a voltage of +10 kV to +20 kV and −3 kV to −1 KV under an ambient humidity of 20% to 50% for 25 min to 60 min with a spacing of 3 cm to 9 cm between a receiver and a needle tip, and a low-temperature source is poured into the receiver.

7. The preparation method according to claim 1 , wherein the vacuum-drying is conducted at 25° C. and a vacuum degree of 0 for 6 h to 9 h.

Assignees

• Univ Beijing Normal

Inventors

• Yang Yi
• Zhu Huiqi
• Xu Xuhui
• Bao Lulu
• Xu Ruikun
• Long Yuxi
• Zheng Chenyang
• Lin Haowen
• Wang Yinuo
• Liu Minyi
• Li Ying
• You Xintong

Classifications

• C02F2201/48

  Devices for applying magnetic or electric fields · CPC title

• C02F2103/005

  Black water originating from toilets · CPC title

• C02F2101/30

  Organic compounds · CPC title

• C02F1/48

  with magnetic or electric fields (C02F1/46 takes precedence) · CPC title

• C02F1/44

  by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)} · CPC title