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Method for degrading formaldehyde in air by using nano titanium dioxide photocatalyst

A technology of nano-titanium dioxide and photocatalyst, which is applied in the field of air purification, can solve the problems of low degradation efficiency and ineffective formaldehyde removal effect, and achieve the effects of improving the effect, improving the quality of formaldehyde degradation, and increasing the flow resistance

Inactive Publication Date: 2022-03-15
GUANGXI TEACHERS EDUCATION UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many air purification devices have been applied to nano-titanium dioxide photocatalysts, but there are generally phenomena such as ineffective removal of formaldehyde and low degradation efficiency.

Method used

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  • Method for degrading formaldehyde in air by using nano titanium dioxide photocatalyst
  • Method for degrading formaldehyde in air by using nano titanium dioxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of method of nano-titanium dioxide photocatalyst degradation formaldehyde in the air, as Figure 1-2 shown, including the following steps:

[0037] S1, Preparation of Formaldehyde Degradation Part 7

[0038] Prepare nano-titanium dioxide paint first, and then spray nano-titanium dioxide paint on the carrier pellet 71, so that the outer surface of the carrier pellet 71 forms a titanium dioxide coating 72 with a thickness of 0.5 mm, and formaldehyde degradation piece 7 is obtained.

[0039] Preferably, the preparation process of nano titanium dioxide coating is as follows:

[0040] S11. Mix the two according to the volume ratio of absolute ethanol and deionized 10:3 to obtain solution A; specifically, deionized is 30ml, and absolute ethanol is 100ml;

[0041] S12. Mix the two according to the volume ratio of the butyl titanate solution and the concentrated hydrochloric acid of 20:1, then add dehydrated alcohol three times the volume of the butyl tit...

Embodiment 2

[0058] Embodiment 2: a kind of method of nano-titanium dioxide photocatalyst degradation formaldehyde in the air, the difference with embodiment 1 is that the preparation process of nano-titanium dioxide coating is as follows:

[0059] S11. Mix the two according to the volume ratio of absolute ethanol and deionized 10:3 to obtain solution A; specifically, deionized is 30ml, and absolute ethanol is 100ml;

[0060] S12. Mix the two according to the volume ratio of the butyl titanate solution and the concentrated hydrochloric acid of 20:1, then add dehydrated alcohol three times the volume of the butyl titanate solution, and mix evenly to obtain the B solution; specifically, the concentrated hydrochloric acid is 5ml, butyl titanate solution is 100ml, absolute ethanol is 300ml;

[0061] S13. Slowly pour the A solution into the B solution under the strong stirring of a magnetic heating stirrer to obtain a gel-like material;

[0062] S14. Sealing and aging the above-mentioned gel-l...

Embodiment 3

[0065] Embodiment 3: a kind of method of nano-titanium dioxide photocatalyst degradation formaldehyde in the air, the difference with embodiment 1 is that the preparation process of nano-titanium dioxide coating is as follows:

[0066] S11. Mix the two according to the volume ratio of absolute ethanol and deionized 10:3 to obtain solution A; specifically, deionized is 30ml, and absolute ethanol is 100ml;

[0067] S12. Mix the two according to the volume ratio of the butyl titanate solution and the concentrated hydrochloric acid of 20:1, then add dehydrated alcohol three times the volume of the butyl titanate solution, and mix evenly to obtain the B solution; specifically, the concentrated hydrochloric acid is 5ml, butyl titanate solution is 100ml, absolute ethanol is 300ml;

[0068] S13. Slowly pour the A solution into the B solution under the strong stirring of a magnetic heating stirrer to obtain a gel-like material;

[0069] S14. Sealing and aging the above-mentioned gel-l...

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Abstract

The invention discloses a method for degrading formaldehyde in air by using a nano titanium dioxide photocatalyst, and belongs to the technical field of air purification, the method comprises the following steps: S1, preparation of a formaldehyde degradation piece: firstly preparing a nano titanium dioxide coating, then spraying the nano titanium dioxide coating on a carrier ball, and then drying to obtain the formaldehyde degradation piece; a titanium dioxide coating with the thickness ranging from 0.1 mm to 5 mm is formed on the outer surface of the carrier small ball, and the formaldehyde degradation part is obtained; s2, mounting of a formaldehyde degradation part: mounting the formaldehyde degradation part in the step S1 into an air purification device, and then putting the air purification device into the air; and S3, formaldehyde degradation: starting the air purification device to enable air to circularly flow through a formaldehyde degradation part in the air purification device so as to degrade formaldehyde in the air. The contact area and contact time of air and the titanium dioxide coating are increased, the formaldehyde removal effect is good, and the degradation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of air purification, more specifically, it relates to a method for degrading formaldehyde in air by a nano-titanium dioxide photocatalyst. Background technique [0002] Photocatalyst is a general term for semiconductor materials with photocatalytic function represented by nano-scale titanium dioxide. Titanium dioxide is an N-type semiconductor with a discontinuous energy band structure consisting of a low-energy valence band filled with electrons and a high-energy band containing holes. There is a forbidden band between the valence band and the conduction band. When light is irradiated, electrons with negative valence are excited, cross the forbidden band and enter the conduction band, and at the same time generate corresponding holes in the valence band to form electron-hole pairs, and move to different positions on the particle surface under the action of an electric field. The electron-hole pairs interac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72B01J21/06B01J35/00B01J35/08B01J35/10B01J37/02
CPCB01D53/007B01D53/8668B01J21/063B01J37/0215B01D2257/704B01D2258/06B01D2259/804B01J35/51B01J35/60B01J35/39
Inventor 贾国庆韦良汪颉温丽珍杨显德杨晶
Owner GUANGXI TEACHERS EDUCATION UNIV
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