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Flexible aluminum-magnesium composite oxide nanofiber membrane and preparation method and application thereof

A composite oxide and nanofiber membrane technology, applied in chemical instruments and methods, alkali metal oxide/hydroxide, fiber treatment, etc., can solve the problems of fiber strength decline, damage to fiber structure integrity, etc., and achieve removal rate Fast, uniform and controllable fiber diameter distribution, and convenient operation

Active Publication Date: 2019-12-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both magnesium oxide and aluminum oxide are excellent heavy metal adsorbents. However, the preparation of flexible aluminum-magnesium composite oxide nanofiber membranes based on electrospinning technology has not been reported. The size of the crystal grains continues to grow, and they aggregate and connect with each other, destroying the integrity of the fiber structure, resulting in a significant decrease in fiber strength. As an adsorbent for environmental restoration, it has a wide range of applications, high safety, and unique It has the characteristics of less pollution and convenient recycling and separation, providing a new strategy for environmental restoration

Method used

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  • Flexible aluminum-magnesium composite oxide nanofiber membrane and preparation method and application thereof
  • Flexible aluminum-magnesium composite oxide nanofiber membrane and preparation method and application thereof
  • Flexible aluminum-magnesium composite oxide nanofiber membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of a flexible aluminum-magnesium composite oxide nanofiber membrane

[0049] (1) 2.5 parts by mass of aluminum isopropoxide, 0.59 parts by mass of crystalline aluminum chloride, 0.6 parts by mass of magnesium nitrate hexahydrate and 0.56 parts by mass of yttrium nitrate hexahydrate are added to 14 parts by volume of ethanol water (v:v=2:1 ) solution, add acetic acid to adjust the pH value to 2-3, keep stirring until the solution is clear, then add 1.0 parts by mass of PVP (M w =1300000) as a spinning aid, stirred until completely dissolved, and hydrolyzed for 12 hours to obtain a stable sol spinning solution.

[0050] (2) Take the above-mentioned sol-spinning solution and inject it into the syringe, and carry out electrospinning to obtain the precursor xerogel fiber film. The spinning process conditions are as follows: the voltage is 16KV; the spinning solution ejection rate is 1.0mL / h; Distance: 17cm; ambient temperature: 25°C; ambient humidity:...

Embodiment 2

[0053] Example 2: Preparation of a flexible aluminum-magnesium composite oxide nanofiber

[0054] (1) 2.5 parts by mass of aluminum isopropoxide, 0.59 parts by mass of crystalline aluminum chloride, 0.6 parts by mass of magnesium nitrate hexahydrate and 0.088 parts by mass of yttrium chloride hexahydrate are added to 25 parts by volume of ethanol water (v:v=2: 1) In the solution, add hydrochloric acid to adjust the pH value to 2-3, keep stirring until the solution is clear, then add 0.6 parts by mass of PEO (M w =1000000) as a spinning aid, stirred until completely dissolved, and hydrolyzed for 6 hours to obtain a stable sol spinning solution.

[0055] (2) Take the above-mentioned sol-spinning solution and inject it into the syringe, and carry out electrospinning to obtain the precursor xerogel fiber film. The spinning process conditions are as follows: the voltage is 22KV; the spinning solution ejection rate is 0.5mL / h; Distance: 20cm; ambient temperature: 20°C; ambient humi...

Embodiment 3

[0058] Example 3: Preparation of a flexible aluminum-magnesium composite oxide nanofiber

[0059] (1) Add 3.75 parts by mass of aluminum isopropoxide, 1.475 parts by mass of crystalline aluminum chloride, 0.72 parts by mass of magnesium chloride hexahydrate and 0.42 parts by mass of yttrium nitrate hexahydrate to 14 parts by volume of ethanol water (v:v=1:1) In the solution, add nitric acid to adjust the pH value to 2-3, keep stirring until the solution is clarified, then add 0.8 parts by mass of PVP (M w =1300000) as a spinning aid, stirred until completely dissolved, and hydrolyzed for 10 hours to obtain a stable sol spinning solution.

[0060] (2) Take the above-mentioned sol-spinning solution and inject it into the syringe, and carry out electrospinning to obtain the precursor xerogel fiber film. The spinning process conditions are as follows: the voltage is 18KV; the spinning solution ejection rate is 0.9mL / h; Distance: 18cm; ambient temperature: 27°C; ambient humidity: ...

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Abstract

The invention belongs to the technical field of inorganic nanofiber materials, discloses a flexible aluminum-magnesium composite oxide nanofiber membrane, a preparation method thereof and an application thereof in the field of environmental treatment and repair, and particularly suitable for the field of heavy metal adsorption. According to the flexible aluminum-magnesium composite oxide nanofibermembrane, an aluminum source and a magnesium source are used as raw materials, yttrium salt is used as a doping agent, acid is used as a hydrolysis catalyst, at least one of polyvinylpyrrolidone andpolyoxyethylene is used as a spinning assistant, and xerogel fibers are obtained in a solvent system by combining a sol-gel method with an electrostatic spinning technology and then subjected to segmental calcination to obtain the membrane. The flexible aluminum-magnesium composite oxide nanofiber membrane prepared by combining the sol-gel method with the electrostatic spinning technology has theadvantages of large specific surface area, high porosity, excellent mechanical property and good flexibility, has the characteristics of high adsorption rate, high removal rate and the like as an adsorption material, avoids the defects of easy agglomeration, difficult recovery and the like of a powder adsorbent, and can be applied to the field of environmental treatment and repair.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanofiber materials, and in particular relates to a flexible aluminum-magnesium composite oxide nanofiber film and its preparation method and application in the field of environmental governance and restoration, and is especially suitable for the field of heavy metal adsorption. Background technique [0002] With the rapid development of my country's mining, chemical, pesticide, dyestuff, metallurgy and battery industries, a large amount of waste containing heavy metals is directly or indirectly discharged into the environment. Since heavy metals cannot be biodegraded and easy to aggregate, they can enter the human body through the food chain. , has caused a serious threat to human health and the balance of the ecosystem. Therefore, the prevention, control and treatment of heavy metal pollution has become an environmental problem that needs to be solved urgently in the environmental protection of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4209D01D5/00D01F9/08B01J20/08B01J20/28
CPCD04H1/728D04H1/4209D01D5/0069D01D5/0076D01D5/0092D01F9/08B01J20/08B01J20/041B01J20/28038
Inventor 章莉娟杨谦庾明茂黄悦
Owner SOUTH CHINA UNIV OF TECH
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