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Preparation method of multifunctional synergistic hierarchical pore air purification membrane

A technology of air purification and multi-stage pores, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problem of low capture effect of ultrafine particles, achieve good application prospects, efficient synergistic purification, and mild reaction conditions Effect

Inactive Publication Date: 2020-04-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the fiber diameter of polyethylene / polypropylene composite nonwovens is micron-scale, the capture effect on ultrafine particles in the air is low, the PM filtration efficiency is only 71.73, and the removal of formaldehyde is only about 40% at room temperature. Rate

Method used

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  • Preparation method of multifunctional synergistic hierarchical pore air purification membrane
  • Preparation method of multifunctional synergistic hierarchical pore air purification membrane
  • Preparation method of multifunctional synergistic hierarchical pore air purification membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 1.58 g KMnO 4 Place in 50 mL deionized water, stir at room temperature until KMnO 4 Dissolve completely and form KMnO 4 solution, and then added 8 mL of n-butanol, after stirring, the reactant was placed in a constant temperature water bath device, and reacted at a constant temperature of 40 °C for 2 h. Then, the reaction mixture was suction-filtered, the solid was separated and collected, and washed three times with deionized water. Finally, the collected brown MnO 2 The solid was dried in a vacuum oven at 60 °C for 24 h.

[0029] The MnO prepared in this example 2 TEM figure 2 (a-c)) and X-ray diffraction ( figure 2 (d)) analysis. from figure 2 (a-c) It can be observed that MnO 2 The nanoparticles are spherical, assembled from nanosheets with unclear boundaries, and have obvious lattice fringes, and the fringe spacing is about 0.7 nm, which is similar to that of birnessite-type δ-MnO 2 corresponding to the (001) crystal plane; from figure 2 (d) Ob...

Embodiment 2

[0031] Weigh 3.16 g KMnO 4 Place in 50 mL deionized water, stir at room temperature until KMnO 4 Dissolve completely and form KMnO 4 solution, and then added 8 mL of n-butanol, after stirring, the reactant was placed in a constant temperature water bath device, and reacted at a constant temperature of 60 °C for 0.5 h. Then, the reaction mixture was suction-filtered, the solid was separated and collected, and washed three times with deionized water. Finally, the collected brown MnO2 The solid was dried in a vacuum oven at 60 °C for 24 h.

[0032] Take the MnO prepared above 2 Nanoparticles 0.3 g solid was ground into a fine powder in an agate mortar and added to 7.2 g N,N - in dimethylformamide, placed in a sonicator for 30 min to make MnO 2 fully dispersed in N,N -Add 1.8 g of tetrahydrofuran and 1 g of polystyrene particles to dimethylformamide, stir at room temperature until the polystyrene is completely dissolved, and prepare a spinning solution with a mass fraction o...

Embodiment 3

[0035] Weigh 2.37 g KMnO 4 Place in 50 mL deionized water, stir at room temperature until KMnO 4 Dissolve completely and form KMnO 4 solution, and then added 8 mL of n-butanol, after stirring, the reactant was placed in a constant temperature water bath device, and reacted at a constant temperature of 25 °C for 3 h. Then, the reaction mixture was suction-filtered, the solid was separated and collected, and washed three times with deionized water. Finally, the collected brown MnO 2 The solid was dried in a vacuum oven at 60 °C for 24 h.

[0036] Take the MnO prepared above 2 0.05 g of nanoparticles was ground into a fine powder in an agate mortar and added to 1.6 g N,N - in dimethylformamide, placed in a sonicator and sonicated for 5 min to make MnO 2 fully dispersed in N,N -Add 2.4 g of tetrahydrofuran and 1 g of polystyrene particles to dimethylformamide, stir at room temperature until the polystyrene is completely dissolved, and prepare a spinning solution with a poly...

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Abstract

The invention discloses a preparation method of a multifunctional synergistic hierarchical pore air purification membrane. The air purification membrane is a polystyrene hierarchical pore nano fiber membrane loaded with MnO2 of a 2D layered structure in pore channels, and the preparation method belongs to the technical field of separation membrane preparation. Based on an oxidation-reduction reaction mechanism of n-butyl alcohol in a potassium permanganate aqueous solution, layered birnessite MnO2 with high catalytic activity is synthesized; the obtained MnO2 is packed to mesoporous channels of single polystyrene nano fibers by one step by utilizing electrostatic spinning technology, thereby preparing the polystyrene hierarchical pore nano fiber membrane with the hierarchical pore structure and loaded with MnO2 in the pore channels. The preparation method disclosed by the invention is simple and applicable in process and low in cost, and the integrated efficient treatment of PM2.5 andformaldehyde gas in indoor air can be realized by utilizing the large specific surface area, high porosity and high gas permeability of the hierarchical pore structure and the abundant surface activeoxygen species and high catalytic activity of the layered MnO2.

Description

technical field [0001] The invention belongs to the technical field of air purification membrane preparation, in particular to a multifunctional air purification loaded layered manganese dioxide (MnO 2 ) preparation method of polystyrene hierarchical porous nanofiber membrane. Background technique [0002] Due to the acceleration of urbanization and the development of science and technology, people's lifestyles have undergone great changes. People spend more than 90% of their time indoors such as offices, schools, shopping malls, public transportation facilities, etc. Therefore, indoor air quality (IAQ) is closely related to our health. The composition of indoor air pollution is complex and diverse, not only containing PM2.5 which is easy to penetrate the lungs, but also volatile organic pollutants such as formaldehyde gas. Although ventilation systems and central air conditioning have been installed in some modern commercial buildings to improve indoor air quality. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00B01D53/86B01D53/44B01D46/54
CPCD04H1/728D01D5/0015B01D53/8687B01D46/543B01D2257/708B01D2258/06
Inventor 仲兆祥胡敏殷铃惠周慧娴邢卫红
Owner NANJING UNIV OF TECH
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