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Silicon dioxide nanofiber membrane loaded with ZIF-8 and used for purifying air

A technology of silica and air purification, applied in the direction of textiles, papermaking, non-woven fabrics, etc., can solve the problems of large volume, high filtration efficiency, large air flow, etc., achieve high filtration efficiency, efficient capture, and long service life Effect

Active Publication Date: 2017-12-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this filter is that it is bulky, and the larger air flow and higher filtration efficiency cannot be combined at the same time.

Method used

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  • Silicon dioxide nanofiber membrane loaded with ZIF-8 and used for purifying air
  • Silicon dioxide nanofiber membrane loaded with ZIF-8 and used for purifying air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Configure a polyvinyl alcohol aqueous solution with a concentration of 10wt%, dissolve it in pure water; configure silica gel (the molar ratio of tetraethyl orthosilicate, water, and phosphoric acid is 1:10:0.01), and add phosphoric acid dropwise into tetraethyl orthosilicate Stir at room temperature for 10 hours for hydrolysis and polycondensation; take an equal mass of polyvinyl alcohol aqueous solution and silica gel and stir and mix evenly to obtain a spinning solution. The prepared spinning solution was filled in a syringe with a No. 21 flat needle for electrospinning. The injection speed was 1.0ml / h, the voltage was 18kV, the receiving distance was 20cm, and the reciprocating speed of the slide table was 3m / min. The humidity is 45%, and the relative temperature is 20°C. The collection device is a drum collector to obtain a hybrid film. The hybrid film was dried in a vacuum oven at 100°C for 2 hours to remove residual moisture; it was calcined in a muffle furnace, ...

Embodiment 2

[0032] Configure a polyvinyl alcohol aqueous solution with a concentration of 14wt%, dissolve it in pure water; configure silica gel (the molar ratio of tetraethyl orthosilicate, water, and phosphoric acid is 1:10:0.01), and add phosphoric acid dropwise into tetraethyl orthosilicate Stir at room temperature for 4 hours for hydrolysis and polycondensation; take an equal mass of polyvinyl alcohol aqueous solution and silica gel and stir and mix evenly to obtain a spinning solution. The prepared spinning solution was filled in a syringe with a No. 21 flat needle for electrospinning. The injection speed was 0.5ml / h, the voltage was 15kV, the receiving distance was 15cm, and the reciprocating speed of the slide table was 5m / min. The humidity is 50%, and the relative temperature is 30°C. The collection device is a drum collector to obtain a hybrid film. The hybrid membrane was dried in a vacuum oven at 60°C for 4 hours to remove residual moisture; it was calcined in a muffle furnace...

Embodiment 3

[0035]Configure a polyvinyl alcohol aqueous solution with a concentration of 8wt%, dissolve it in pure water; configure silica gel (the molar ratio of tetraethyl orthosilicate, water, and phosphoric acid is 1:11:0.01), and add phosphoric acid dropwise into tetraethyl orthosilicate Stir at room temperature for 6 hours for hydrolysis and polycondensation; take an equal mass of polyvinyl alcohol aqueous solution and silica gel and stir and mix evenly to obtain a spinning solution. Fill the prepared spinning solution into a syringe with a No. 21 flat needle for electrospinning. The injection speed is 1.5ml / h, the voltage is 25kV, the receiving distance is 30cm, and the reciprocating speed of the slide table is 4m / min. The humidity is 30%, and the relative temperature is 15°C. The collection device is a drum collector to obtain a hybrid film. The hybrid film was dried in a vacuum oven at 70°C for 8 hours to remove residual moisture; it was calcined in a muffle furnace, and the temp...

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Abstract

The invention discloses a preparation method of a silicon dioxide nanofiber membrane loaded with a zeolite imidazate framework structural material (ZIF-8) and used for purifying air, a blend spinning solution is prepared by a polyving akohol solution and silica gel, and the silicon dioxide nanofiber membrane is prepared through electrostatic spinning, vacuum drying and high-temperature calcination; a methanol solution of zinc nitrate hexahydrate and a methanol solution of 2-methylimidazole are subjected to back-diffusion on the two sides of the silicon dioxide membrane respectively, and the silicon dioxide nanofiber membrane loaded with the zeolite imidazate framework structural material (ZIF-8) is obtained. According to the silicon dioxide nanofiber membrane loaded with the ZIF-8 and used for purifying the air, the cost is low, the technology is simple and practical, and the PM 2.5 is efficiently gathered in the air purification process by the aid of the high specific surface area of the zeolite imidazate framework structural material (ZIF-8).

Description

technical field [0001] The invention belongs to the technical field of nanofiber composite membrane preparation, in particular to a method for preparing a silica nanofiber composite membrane loaded with zeolite imidazolate framework material (ZIF-8) for air purification. Background technique [0002] Airborne particulate matter (PM) pollution greatly affects people's quality of life and poses a serious threat to public health. There are two main types of air filters available: one is a porous membrane filter, which is similar to a water filtration filter, this type of air filter is made by creating pores in a solid substrate, with a very small pore size Particles with smaller sizes can be filtered, but have a lower porosity (about 30%). Therefore, despite its high filtration efficiency, the pressure drop is large. The other is a fiber air filter, which traps particulate matter through a physical barrier and adhesion. This type of filter has a porosity of about 70% and is ...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/42
CPCD04H1/42D04H1/728D10B2505/04
Inventor 仲兆祥朱秋昀姚忠
Owner NANJING UNIV OF TECH
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