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Nanofiber membrane with heavy metal absorption function and preparation method thereof

A nanofiber membrane and heavy metal technology, which is applied in the field of membrane materials, can solve the problems of limited adsorption capacity of metal ions, and achieve the effects of high-efficiency adsorption of heavy metal ions, large specific surface area, and simple separation

Active Publication Date: 2013-04-24
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials of this product are abundant and easy to obtain, but the adsorption capacity for metal ions is limited, and after the adsorption of metal ions, hemicellulose needs to be collected and processed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method comprises the following steps:

[0026] Preparation of a nanofiber membrane with heavy metal adsorption function:

[0027] A Preparation of Polyolefin Copolymer Nanofibrous Membranes

[0028] The preparation adopts the preparation method of Chinese Patent Publication No. CN 101553607A, that is, PVA-co-PE and cellulose acetate butyrate (CAB) are uniformly mixed according to a mass ratio of 1:4, and dried. After being melted and extruded by a twin-screw extruder, after collection, the CAB was extracted by refluxing acetone at 60°C for 72 hours to obtain nanofibers with a fiber diameter of ≤200 nm.

[0029] The PVA-co-PE nanofibers extracted with acetone are dispersed in a certain solvent with a mass fraction of 1% to 5% to prepare a nanofiber suspension. Then, the nanofiber suspension is formed on various fiber fabrics by high pressure air forming technology to obtain PVA-co-PE nanofiber membrane.

[0030] Preparation of B activated PVA-co-PE nan...

Embodiment 1

[0047] According to the above method, the prepared PVA-co-PE nanofiber membrane was immersed in 2 mol / L sodium hydroxide and stirred uniformly, the immersion temperature was 25°C, and the immersion time was 35 min. After taking out, it was immersed in a 10% mass fraction of cyanuric chloride solution of 1,4-dioxane and stirred evenly, the immersion temperature was 50°C, and the immersion time was 120min, taken out, cleaned and dried to obtain an active PVA- co-PE nanofiber membrane.

[0048] The preparation concentration is 5mol / L sodium hydroxide solution, take 30ml of sodium hydroxide solution as solvent, prepare the solution of iminodiacetic acid with concentration of 5mol / L, and immerse the obtained active PVA-co-PE nanofiber membrane in iminodiacetic acid. The solution of diacetic acid was stirred evenly, the immersion temperature was 50°C, and the immersion time was 2 hours. After taking out, it was washed three times with 0.1 mol / L sodium hydroxide solution and water, ...

Embodiment 2

[0050] According to the above method, the prepared PVA-co-PE nanofiber membrane was immersed in a 2 mol / L sodium hydroxide solution and stirred uniformly, the immersion temperature was 50 °C, and the immersion time was 60 min. After taking out, it was immersed in a 1,4-dioxane solution with a mass fraction of 5% cyanuric chloride and stirred evenly, the immersion temperature was 50° C., and the immersion time was 120 min. co-PE nanofiber membrane.

[0051] The preparation concentration is 5mol / L sodium hydroxide solution, take 30ml sodium hydroxide solution as the solvent, prepare the solution of iminodiacetic acid with concentration 0.05mol / L, and immerse the obtained active PVA-co-PE nanofiber membrane in the sub The solution of aminodiacetic acid was uniformly stirred, the immersion temperature was 70°C, and the immersion time was 3 hours. After taking out, it was washed three times with 0.1 mol / L sodium hydroxide solution and water, respectively, to obtain a PVA-co-PE nan...

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Abstract

The invention discloses a nanofiber membrane with a heavy metal absorption function and a preparation method of the nanofiber membrane with the heavy metal absorption function. Polyolefin copolymer is adopted as base material, and the chemical modification nanofiber membrane with the heavy metal absorption function is prepared through surface chemical modification and active molecule solide-phase synthesis process. The nanofiber membrane with the heavy metal absorption function overcomes the shortcomings that the process is complex, cost is high, secondary pollution is prone to being caused, and the like in performance aspect, and effective absorption for heavy metal ions is achieved by means of the principle that amino polyacid complexes the heavy metal ions. Due to the adoption of the solid-phase synthesis process, the amino polyacid is enabled to be well fixed on the surface of the nanofiber membrane and to absorb the heavy metal ions in a repeated recycle mode. The nanofiber membrane with the heavy metal absorption function can be widely applied to the fields of water treatment and the like.

Description

technical field [0001] The invention relates to a nanofiber membrane with heavy metal adsorption function and a preparation method thereof, belonging to the technical field of membrane materials. Background technique [0002] Metallurgy, electronics, chemical industry, textile and other industries are prone to discharge a large amount of heavy metal ion wastewater, which is very harmful to the environment and has become a research topic that the environmental academic community pays close attention to. Heavy metals cannot be decomposed in water and soil, and are easily transmitted through the food chain. After entering the human body, they are prone to accumulation and poisoning. In order to solve the harm caused by heavy metals in wastewater to the environment, a large number of heavy metal adsorbents have been invented and applied. The Chinese patent publication number is CN101954268A, the publication date is January 26, 2011, and the name of the invention is a preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D69/02B01D67/00C02F1/28C02F1/44C02F101/20
Inventor 王栋陆莹吴志红赵青华李沐芳
Owner WUHAN TEXTILE UNIV
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