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Methanal purifying agent adopting visible light photocatalysis and preparation method of methanal purifying agent

A visible light and purifying agent technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as unsatisfactory effects, low formaldehyde efficiency, and inability to efficiently utilize visible light, and improve the purification efficiency of formaldehyde. , the effect of large environmental benefits and economic benefits

Active Publication Date: 2015-05-13
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to TiO 2 The wavelength of maximum light absorption is 387.5nm, namely TiO 2 It can only effectively absorb the ultraviolet part of the light (only 4% in sunlight), so TiO 2 Formaldehyde-like purifiers cannot efficiently use visible light, which makes their efficiency in purifying formaldehyde lower
Although photoactive compounds (such as erythrosine B, thionine, and transition metal oxides) were adsorbed on TiO by chemisorption or physisorption 2 Surface and other means can expand its excitation wavelength range, but the effect is not ideal

Method used

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  • Methanal purifying agent adopting visible light photocatalysis and preparation method of methanal purifying agent
  • Methanal purifying agent adopting visible light photocatalysis and preparation method of methanal purifying agent
  • Methanal purifying agent adopting visible light photocatalysis and preparation method of methanal purifying agent

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Embodiment 1

[0028] Embodiment 1 of the present invention provides a preparation method of a visible light photocatalyzed formaldehyde purifying agent, which comprises the following steps:

[0029] Preparation of powdered bismuth vanadate:

[0030] dissolving bismuth salt and chelating agent in acid to obtain a first solution; dissolving soluble vanadate in an alkaline solution to obtain a second solution; adding the second solution to the first solution to adjust the Ph value to acidity to obtain Yellow suspension: subjecting the yellow suspension to hydrothermal treatment, then performing solid-liquid separation, washing and drying the solid matter to obtain powdered bismuth vanadate. Further, the first solution is: Bi(NO 3 ) 3 ·5H 2 O and EDTA were sequentially dissolved in 2M HNO under the condition of magnetic stirring 3 In the solution, wherein the molar ratio of EDTA and Bi is 0.2:1; the second solution is: the NH 4 VO 3 Dissolve in 2M KOH under magnetic stirring; add the seco...

example 1

[0037] Step 1: Preparation of BVO powder

[0038]0.01mol Bi(NO 3 ) 3 ·5H 2 O and 0.002mol EDTA (EDTA:Bi=0.2:1) were successively dissolved in 15ml 2M HNO under the condition of magnetic stirring 3 , to obtain the first solution; 0.01mol NH 4 VO 3 Dissolve in 10 ml 2M KOH under magnetic stirring to obtain a second solution. Then, under the condition of magnetic stirring, the second solution was added dropwise to the first solution, with 2M KOH or 2M HNO 3 Adjust pH=4 to obtain a yellow suspension.

[0039] Afterwards, the yellow suspension was transferred to a hydrothermal kettle (volume 100ml) and sealed, and placed in an electric blast drying oven at 160°C for 20h. Finally, the suspension in the hydrothermal kettle was centrifuged, washed three times with deionized water and once with absolute alcohol, and then dried in an electric blast drying oven at 60°C to obtain a yellow powder.

[0040] Through the XRD pattern ( figure 1 ) It can be seen that the yellow powder ...

example 2

[0047] Step 1: Preparation of BVO powder

[0048] 0.01mol Bi(NO 3 ) 3 ·5H 2 O and 0.005mol EDTA (EDTA:Bi=0.5:1) were successively dissolved in 15ml 2M HNO under the condition of magnetic stirring 3 , the resulting solution is named A solution; 0.01mol NH 4 VO 3 The solution obtained by dissolving in 10 ml 2M KOH under the condition of magnetic stirring is named B solution. Then, under the condition of magnetic stirring, the B solution was added dropwise to the A solution, with 2M KOH and 2M HNO 3 Adjust pH=7 to obtain a yellow suspension.

[0049] Afterwards, the yellow suspension was transferred to a hydrothermal kettle (volume 100ml) and sealed, and placed in an electric blast drying oven at 200°C for 10 hours. Finally, the suspension in the hydrothermal kettle was centrifuged, washed three times with deionized water and once with absolute alcohol, and then dried in an electric blast drying oven at 60°C to obtain a yellow powder.

[0050] Through the XRD pattern ( ...

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Abstract

The invention relates to a methanal purifying agent adopting visible light photocatalysis and a preparation method of the methanal purifying agent. The methanal purifying agent comprises pucherite and titanium dioxide, wherein the pucherite is loaded into the titanium dioxide, the mass ratio of the pucherite to the titanium dioxide is (0.6:100)-(0.67:100), and the crystalline phase of the pucherite is a monoclinic phase. According to the invention, the pucherite and the titanium dioxide are combined, through the synergy effect of the pucherite and the titanium dioxide, methanal can be effectively degraded within the ranges of the visible lights and ultraviolet rays, so that higher methanal purifying efficiency is achieved, and the methanal purifying agent is more suitable for practical usage.

Description

technical field [0001] The invention relates to a purifying agent and a preparation method thereof, in particular to a visible light photocatalyzed formaldehyde purifying agent and a preparation method thereof. Background technique [0002] With the improvement of people's living standards and the diversification of interior decoration materials, indoor air pollution is also intensified. As one of the important factors of indoor air pollution, formaldehyde can cause acute and chronic poisoning of the respiratory tract, throat and other organs, reduce the immune function of the body, cause neurasthenia, and memory loss. The World Health Organization (WHO) issued the No. 153 "Formaldehyde Carcinogenic" Bulletin, pointing out that formaldehyde can not only cause nasal cavity cancer and sinus cancer, but also has strong but insufficient evidence to show that it can also cause leukemia. Indoor formaldehyde comes from materials used in interior decoration or furniture, such as pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01D53/86B01D53/72
Inventor 刘振森何捷聂卿萧瑛徐伟伟崔敬轩
Owner CHINA BUILDING MATERIALS ACAD
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