Sliver-titanium composite film loaded wood base material capable of degrading formaldehyde under visible light irradiation, and preparation method of sliver-titanium composite film loaded wood base material

A composite film and visible light technology, which is applied in separation methods, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve problems such as low catalytic efficiency, small wavelength range of light absorption, and difficult recycling. Achieve the effects of improving catalytic efficiency, easy process control, and expanding the absorption range

Inactive Publication Date: 2015-12-09
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing method for photocatalytic degradation of formaldehyde with a single catalyst has small absorption wavelength range, low catalytic efficiency, difficult recovery, and cannot fundamentally solve the problem of a part of formaldehyde release, and provides a method for degrading formaldehyde under visible light irradiation Wood-based material supported by silver-titanium composite film and preparation method thereof

Method used

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  • Sliver-titanium composite film loaded wood base material capable of degrading formaldehyde under visible light irradiation, and preparation method of sliver-titanium composite film loaded wood base material
  • Sliver-titanium composite film loaded wood base material capable of degrading formaldehyde under visible light irradiation, and preparation method of sliver-titanium composite film loaded wood base material

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specific Embodiment approach 1

[0023] Specific Embodiment 1: The silver-titanium composite film-loaded wood-based material described in this embodiment can degrade formaldehyde to a concentration of 0.12 mg / m under visible light with a wavelength of 400 nm to 800 nm. 3 within;

[0024] The wood-based material supported by the silver-titanium composite film that degrades formaldehyde under visible light irradiation is first dipped into the silver-ammonia solution to react with the wood loaded with titanium dioxide. After the reaction, the wood A is taken out to obtain the remaining silver-ammonia solution, and then the wood A is Immersing in an aqueous glucose solution for reaction, then adding the remaining silver ammonia solution to the aqueous glucose solution impregnated with wood A to continue the reaction to obtain wood B, and finally washing and drying wood B to obtain;

[0025] The concentration of the aqueous glucose solution is 0.001mol / L˜10mol / L.

[0026] In this embodiment, the concentration of ...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the titanium dioxide-loaded wood is prepared according to the following steps: mix boric acid, ammonium fluorotitanate and distilled water, stir evenly to obtain a mixed solution, and then Add a hydrochloric acid solution with a concentration of 0.001 mol / L to 10 mol / L dropwise into the mixed solution until the pH of the mixed solution is 3, and then immerse the wood in the mixed solution with a pH of 3. Hydrothermal reaction in a vacuum oven for 5h to 20h. After the reaction, wash the reacted wood with deionized water and dry it in an oven to obtain titanium dioxide-loaded wood;

[0033] The concentration of the boric acid in the mixed solution is 0.5mol / L-2mol / L; the concentration of the ammonium fluorotitanate in the mixed solution is 0.2mol / L-1.8mol / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the described silver ammonia solution is prepared according to the following steps: under stirring conditions, the mass percentage is 20%~40% ammoniacal liquor Add it dropwise to silver nitrate aqueous solution with a concentration of 0.1mol / L-2mol / L until clear and transparent to obtain silver ammonia solution. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a sliver-titanium composite film loaded wood base material for degrading formaldehyde under visible light irradiation, and a preparation method of the sliver-titanium composite film loaded wood base material, and relates to a wood base material capable of degrading formaldehyde under visible-light photocatalysis, and a preparation method of the wood base material. The sliver-titanium composite film loaded wood base material solves the problems that the conventional photocatalytic formaldehyde degradation method using single catalyst has the defects of small light-absorbing wavelength range, low catalytic efficiency and difficulty in recycle. The material is capable of degrading formaldehyde under the irradiation of visible light with wavelength of 400nm-800nm to reduce the concentration of formaldehyde to below 0.12mg/m3. Titanium dioxide loaded wood is firstly soaked in a Tollens' reagent to react; after the reaction, wood A is taken out of the Tollens' reagent, and the residual Tollens' reagent is obtained; the wood A is soaked in a glucose aqueous solution to react, and then the residual Tollens' reagent is added into the glucose aqueous solution in which the wood A is soaked to continue the reaction; and finally, performing washing and drying to obtain the sliver-titanium composite film loaded wood base material. The preparation method comprises: 1, preparing the titanium dioxide loaded wood; and 2, carrying out an impregnation reaction.

Description

technical field [0001] The invention relates to a wood-based material for visible light photocatalytic degradation of formaldehyde and a preparation method thereof. Background technique [0002] Formaldehyde is one of the important pollutants in the indoor environment. Studies have shown that formaldehyde can be degraded by adsorbents or catalysts, such as: activated carbon, titanium dioxide, zinc oxide, etc. However, a single catalyst has a wide band gap and can only absorb ultraviolet light with a wavelength less than 400nm. The range of light absorption improves the catalytic efficiency of the catalyst, and metal elements such as silver are combined with titanium dioxide to reduce the recombination of electrons and holes, thereby improving the efficiency of photocatalytic degradation of formaldehyde. In addition, some powder or granular catalysts are difficult to recycle, which hinders the development of environmental purification technology. As a natural organic materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01D53/86B01D53/72
Inventor 李坚詹先旭高丽坤甘文涛肖少良
Owner NORTHEAST FORESTRY UNIVERSITY
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