A method for photocatalytic removal of formaldehyde by zinc/antimony two-component supported nano-silicon carbide material

A nano-silicon carbide, two-component technology, applied in physical/chemical process catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of low specific surface area of ​​materials, low photoelectric conversion efficiency, cumbersome preparation process, etc. Enhanced sensitivity, shortened degradation time, and strong adsorption

Active Publication Date: 2021-06-18
安徽誉望之子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these photocatalysts, especially TiO 2 The catalytic activity is the highest and the stability is the best, but its photoelectric conversion efficiency is low (it has good catalytic effect only in the ultraviolet range, and the effect is poor under visible light) and the catalyst is easy to deactivate, so it limits TiO 2 catalytic applications
Due to non-TiO 2 The catalytic system has excellent photocatalytic efficiency, which has aroused the interest of many researchers, such as Zn 2 SnO 4 System (Transformation process and photocatalytic activities of hydrothermally synthesized Zn 2 SnO 4 nanocrystals, J. Phys. Chem. C 112(2008) 4159–4167), but the specific surface area of ​​the prepared materials is often relatively low, and the preparation process is relatively cumbersome

Method used

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  • A method for photocatalytic removal of formaldehyde by zinc/antimony two-component supported nano-silicon carbide material
  • A method for photocatalytic removal of formaldehyde by zinc/antimony two-component supported nano-silicon carbide material
  • A method for photocatalytic removal of formaldehyde by zinc/antimony two-component supported nano-silicon carbide material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of aminated nano silicon carbide particles:

[0038] 1) Put 10.0g of nano-silicon carbide particles (model DK-SiC-001, without any pretreatment) into 100ml of toluene solution, then add 0.3g of vinyl tris(β-methoxyethoxy)silane in nitrogen Reflux reaction under atmosphere for 2-5h;

[0039] 2) Cool down to room temperature, filter, wash with 30ml of acetone, and dry under reduced pressure at 60°C to obtain silanized surface-modified nano-silicon carbide particles;

[0040] 3) Place all the silanized surface-modified nano-silicon carbide particles obtained in step 2) in a mixed solution of 10ml of concentrated nitric acid and concentrated sulfuric acid (concentrated nitric acid and concentrated sulfuric acid are equal in weight) and immerse in ultrasonic for 24 hours, then filter and wash with water until the filtrate becomes After neutralization, dry under reduced pressure at 60°C to obtain nitrated nano-silicon carbide;

[0041] 4) Put nitrated nano-silic...

Embodiment 2

[0043] The preparation of zinc / antimony two-component supported nano-silicon carbide material with high specific surface area comprises the following steps:

[0044] 1) Put zinc sulfate heptahydrate (2.88g, 10mmol) and potassium antimony tartrate trihydrate into the aqueous solution, then add hexadecyltrimethylammonium bromide and stir for 10-30min to obtain the first mixed solution (by molar ratio Calculation, the molar ratio of zinc sulfate heptahydrate: potassium antimony tartrate trihydrate: cetyltrimethylammonium bromide is 3:1:0.4);

[0045] 2) Add aminated nano-silicon carbide particles (SiC-N) to the first mixed solution, raise the temperature to 60-80°C, stir and disperse evenly, then slowly add potassium hydroxide aqueous solution dropwise, adjust the pH to 10-11, and precipitate solid particles to deposit on The surface of the nano-silicon carbide particles and the inside of the pore diameter, and then heat-preserved and stirred for 24 hours to obtain a black mixtur...

Embodiment 3

[0057] Formaldehyde wastewater degradation test: Dilute commercially available 37.0-40.0wt% formaldehyde aqueous solution with water to prepare formaldehyde aqueous solutions with different concentrations (10000mg / L, 600mg / L, 20mg / L), and use 600mg / L formaldehyde to test catalyst performance:

[0058] 1) Prepare 1L aqueous solution containing 600mg / L formaldehyde, adjust the pH to 9-10 with sodium hydroxide, then add nano-silicon carbide particles (DK-SiC-001), aminated nano-silicon carbide particles (SiC-N), Non-aminated modified zinc-antimony double hybrid nano-silicon carbide material (Cat-SiC / zinc / antimony), zinc hybrid nano-silicon carbide material (Cat-SiC-N / zinc) or nano-carbonization of zinc-antimony double hybrid Each 1g of silicon material (Cat-SiC-N / zinc / antimony) was stirred evenly to obtain the formaldehyde wastewater solution to be treated;

[0059] 2) Raise the temperature of the formaldehyde wastewater solution to be treated to 45°C, place it under a 30W ultrav...

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Abstract

The invention belongs to the technical field of eco-environmental protection materials, and in particular relates to a method for photocatalytically removing formaldehyde with a zinc / antimony dual-component loaded nano-silicon carbide material. In the present invention, zinc sulfate is used as a zinc precursor, potassium oxyantimony tartrate is used as an antimony precursor, and a catalytic material with a high specific surface area is formed by hydrothermally loading on aminated modified nano-silicon carbide particles, which can be used for catalytic degradation Indoor formaldehyde gas, car formaldehyde gas, formaldehyde wastewater and phenolic resin wastewater.

Description

technical field [0001] The invention belongs to the technical field of eco-environmental protection materials, and in particular relates to a method for photocatalytically removing formaldehyde with a zinc / antimony dual-component loaded nano-silicon carbide material. Background technique [0002] Formaldehyde (formaldehyde) belongs to highly volatile organic compounds (volatile organic chemicals, Vocs). It is a colorless gas with a pungent odor at room temperature. It is easily soluble in water. It is a small molecule aldehyde compound with relatively active chemical properties. Once the personnel exposure exceeds the allowable amount, it will cause strong irritation to the eyes and respiratory mucosa, and high concentration exposure can cause liver damage and immune damage and other toxic effects. Formaldehyde is a highly toxic protoplasmic poison that destroys biological cell proteins. It can combine with amino groups of proteins to denature and solidify proteins. Epidemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/228B01J35/10B01J37/03B01J37/10B01J37/08C02F1/30C02F1/32B01D53/86B01D53/72C02F101/34
CPCB01D53/8668B01J27/228B01J35/0013B01J35/004B01J35/1014B01J35/1038B01J35/1042B01J37/035B01J37/082B01J37/10C02F1/30C02F1/32C02F2101/34C02F2305/10
Inventor 吕桂兰张孝顺文婷婷董晓娜季辉
Owner 安徽誉望之子科技有限公司
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