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ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as preparation method and application thereof

A composite nanofiber, ZIF-8 technology, applied in the direction of textiles, papermaking, non-woven fabrics, etc., to achieve the effects of reducing loss, easy recycling, and easy reaction conditions

Inactive Publication Date: 2016-09-21
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, we consider that PVA can be used as the immobilizing agent of ZIF-8, and there is no report of PVA as the immobilizing agent of ZIF-8 in the prior art

Method used

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  • ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as preparation method and application thereof
  • ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as preparation method and application thereof
  • ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Preparation of 3wt%ZIF-8 / PVA porous nanofiber membrane

[0038] 200mL methanol solution containing 2.6g zinc nitrate hexahydrate and 200mL methanol solution containing 6.0g 2-methylimidazole were magnetically stirred and mixed at room temperature for 20h at room temperature, and the stirring speed was 1000rpm to prepare ZIF-8 nanoparticles, which were centrifuged at 5000rpm for 20min and used After washing with methanol, the obtained nanocrystals were vacuum-dried at 40° C. for 24 hours to obtain ZIF-8 nanoparticles.

[0039]Get 0.036g of the obtained ZIF-8 nanoparticles and mix them with 1.2g polyvinyl alcohol (PVA), then dissolve them in 18.764g deionized water, stir on a magnetic stirrer for 20min to fully swell, then heat and stir in a water bath at 80°C for 2h, the stirring speed 350rpm. Cool to room temperature to obtain a uniformly dispersed spinning solution.

[0040] The resulting electrospinning solution was placed in a 10mL syringe for electro...

Embodiment 2

[0041] Embodiment 2: Preparation of 1wt%ZIF-8 / PVA porous nanofiber membrane

[0042] A 200mL methanol solution containing 2.933g zinc nitrate hexahydrate and a 200mL methanol solution containing 6.489g 2-methylimidazole were magnetically stirred and mixed at room temperature for 22 hours at a stirring speed of 1100rpm to obtain ZIF-8 nanoparticles, centrifuged at 7000rpm for 15min and used After washing with methanol, the obtained nanocrystals were dried in vacuum at 50° C. for 20 h to obtain ZIF-8 nanoparticles.

[0043] Get 0.014g of the obtained ZIF-8 nanoparticles and mix them with 1.4g polyvinyl alcohol (PVA) and then dissolve them in 18.596g deionized water, stir on a magnetic stirrer for 30min to fully swell, then heat and stir in a water bath at 85°C for 2.5h, and stir The speed is 370rpm. Cool to room temperature to obtain a uniformly dispersed spinning solution.

[0044] The resulting electrospinning solution was placed in a 10mL syringe for electrospinning, the sp...

Embodiment 3

[0045] Embodiment 3: Preparation of 2wt% ZIF-8 / PVA porous nanofibrous membrane

[0046] 200mL methanol solution containing 3.4g zinc nitrate hexahydrate and 200mL methanol solution containing 7.0g 2-methylimidazole were magnetically stirred and mixed at room temperature for 24h at room temperature, and the stirring speed was 1200rpm to obtain ZIF-8 nanoparticles. Centrifuge at 8000rpm for 10min and use methanol After washing, the obtained nanocrystals were vacuum-dried at 60° C. for 12 hours to obtain ZIF-8 nanoparticles.

[0047] Get 0.032g of the obtained ZIF-8 nanoparticles and mix them with 1.6g polyvinyl alcohol (PVA) and then dissolve them in 18.368g deionized water, stir on a magnetic stirrer for 40min to fully swell, then heat and stir in a water bath at 90°C for 3h, the stirring speed 400rpm. Cool to room temperature to obtain a uniformly dispersed spinning solution.

[0048] The resulting electrospinning solution was placed in a 10mL syringe for electrospinning, th...

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Abstract

The invention discloses a ZIF-8 / poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as a preparation method and application thereof, belonging to the technical field of preparation of functional nanofiber membranes. The method comprises the following steps of: (1) carrying out hybrid reaction on a methanol solution of soluble zinc salt and a methanol solution of 2-methylimidazole under room temperature and purifying an obtained reaction liquid after reaction ends, thus obtaining nano ZIF-8; (2) mixing obtained nano ZIF-8 with PVA, dissolving the mixture in deionized water, stirring the mixture to swell, then carrying out stirring heating reaction and cooling the reactant to the room temperature after reaction ends, thus obtaining an electrostatic spinning solution; and (3) putting the obtained electrostatic spinning solution in an injector to carry out electrostatic spinning, thus obtaining the ZIF-8 / PVA composite nanofiber membrane. The method not only has the effect of overcoming the defect that the ZIF-8 material is difficult to recover and industrially apply in a water phase but also has better selective adsorption property and can be applied to sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional nanofiber membranes, and in particular relates to a ZIF-8 / polyvinyl alcohol composite nanofiber membrane and its preparation method and application. Background technique [0002] With the development of the printing and dyeing industry, printing and dyeing wastewater has become one of the most important sources of water and soil pollution, and one of the most difficult industrial wastewater to treat. High chroma dye wastewater seriously affects the water quality, and will have toxic effects on organisms and even "three causes" effects. Traditional dye wastewater is usually treated by physical and chemical processes. However, these technologies usually have some defects in dye removal, such as high cost, secondary pollution, non-recyclable, and cannot be widely used in dye wastewater. Adsorption technology is widely used to treat large-scale industrial wastewater due to its high ...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4309D01F6/50D01F1/10
CPCD04H1/728D01F1/10D01F6/50D04H1/4309
Inventor 程建华范笑笑张鹏陈杰峰谢明容
Owner SOUTH CHINA UNIV OF TECH
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