Fe3O4 ceramsite, preparation method and applications thereof

A technology of ferroferric oxide and ceramsite, which is applied in the direction of chemical instruments and methods, applications, ceramic products, etc., can solve the problem of degradation of airborne endotoxin without microwave radiation, achieve good application prospects, high reflection loss, and easy preparation Effect

Active Publication Date: 2020-02-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some researchers have used the thermal and non-thermal effects of microwaves to inactivate bioaerosols, there has been no research on combining microwave technology with microwave-absorbing fillers to improve their inactivation performance.
In addition, so far, there is no research on the degradation of airborne endotoxin by microwave radiation

Method used

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  • Fe3O4 ceramsite, preparation method and applications thereof
  • Fe3O4 ceramsite, preparation method and applications thereof
  • Fe3O4 ceramsite, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A microwave reaction device for removing bioaerosols, comprising a shell, a quartz tube 3 fixedly arranged in the shell, and quartz wool filled between the quartz tube 3 and the shell, the top of the quartz tube 3 is fixed with The infrared temperature measurement module 5 is fixed with a magnetron 6 for generating microwaves at the bottom, and a porous sieve plate 8 is arranged inside the quartz tube 3 to divide the quartz tube 3 into an upper chamber and a lower chamber. The side wall of the chamber is provided with an air inlet 1 communicating with it, the upper chamber is used for filling wave-absorbing filler and at least one air outlet 2 communicating with it is provided on the side wall, and the housing is provided with There is an observation port 7 for observing the wave-absorbing filler.

[0038] As a preferred manner, the number of the gas outlets 2 is two, which are respectively located at different heights of the quartz tube 3 .

[0039] As a preferred met...

Embodiment 2

[0045] Weigh 40g of ferric oxide powder, 10g of bentonite, NaHCO 3 0.25g, mix thoroughly and add water and mix thoroughly. Use the above-mentioned mixed materials to make a single pellet with a diameter of 5-10mm, put it in an oven at 150°C for 30 minutes, then put it into a muffle furnace, bake it at 200°C for 30 minutes, and naturally cool to room temperature to obtain tetraoxide Tri-iron ceramsite with a porosity of 4.7%.

[0046] The above-mentioned ferroferric oxide ceramsite is packed into the reaction device of embodiment 1 as a microwave filler, the total power of the magnetron 6 with a set frequency of 2.45GHz is 700W, and the initial concentration of treatment is 10 5.8 CFU / m 3About Escherichia coli bioaerosol (Escherichia coli CMCC1.3373), when described Escherichia coli bioaerosol is under the condition of 20 seconds residence time in the reaction device of embodiment 1, the Escherichia coli biogas of export Sol concentration is 10 1.7 CFU / m 3 About, inactivat...

Embodiment 3

[0048] Weigh 80g of ferric oxide powder, 20g of bentonite, NaHCO 3 0.5g, mix thoroughly and add water and mix thoroughly. Use the above-mentioned mixed materials to make a single pellet with a diameter of 5-10mm, put it in an oven at 150°C for 30 minutes, then put it into a muffle furnace, bake it at 200°C for 30 minutes, and naturally cool to room temperature to obtain tetraoxide Tri-iron ceramsite with a porosity of 4.7%.

[0049] The above-mentioned ferroferric oxide ceramsite is packed into the reaction device of embodiment 1 as a microwave filler, the total power of the magnetron 6 with a set frequency of 2.45GHz is 700W, and the initial concentration of treatment is 10 6.1 CFU / m 3 About Bacillus subtilis bioaerosol (Bacillus subtilis CMCC1.4255), when described Bacillus subtilis bioaerosol residence time is under the condition of 20 seconds in the reaction device of embodiment 1, the Bacillus subtilis organism of export Aerosol concentration is 10 2.9 CFU / m 3 About,...

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Abstract

The invention discloses Fe3O4 ceramsite, a preparation method and applications thereof. The preparation method comprises: 1, weighing Fe3O4 powder and bentonite according to a mass ratio of (7-9):2, adding NaHCO3 accounting for 0.4-0.6% of the total mass of the Fe3O4 powder and the bentonite, completely mixing, adding water, and uniformly blending; 2, preparing a single pellet with a diameter of 5-10 mm from the mixture obtained in the step 1 by using a pelletizer; 3, drying the pellet prepared in the step 2 for 20-40 min at a temperature of 120-180 DEG C; and 4, sealing the dried pellet, roasting the pellets at 150-250 DEG C for 20-40 min, and naturally cooling to a room temperature of 20-30 DEG C to obtain the Fe3O4 ceramsite. According to the invention, the Fe3O4 ceramsite can be used as a wave-absorbing material so as to be used for microwave radiation inactivation of biological aerosols.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a ferroferric oxide ceramsite and a preparation method and application thereof. Background technique [0002] There are a large number of microorganisms and their secretions (biological particles) in the air, including: bacteria, viruses, chlamydia, mycoplasma, fungal spores, algae and plant cells (including pollen), insects (including mites) and their fragments and secretions The two-phase dispersion system formed by these biological particles suspended in the air and the air is called bioaerosol. The aerodynamic equivalent diameter of the bioaerosol is between 0.5-100 μm, and the equivalent diameter of the bacteria-carrying particles is generally between 4-20 μm, among which the bacteria-carrying particles with an equivalent diameter of 1-5 μm can directly invade the alveoli and cause the initial lung infection. Harmful to human health. [0003] Endotoxin is a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/26B01D39/06C09K3/00
CPCC04B38/009C04B38/02C04B35/26B01D39/06C09K3/00C04B2235/349C04B38/0074
Inventor 王灿张郅巍路思艺
Owner TIANJIN UNIV
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