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Manganese dioxide composite material, and preparation method and application thereof

A technology of manganese dioxide and composite materials, applied in the field of materials, can solve problems such as low conversion rate, limited practical application, and unsatisfactory conversion rate, and achieve the effects of easy operation, good application prospects, and accelerated catalytic oxidation speed

Active Publication Date: 2018-08-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transition metal oxides, especially manganese oxides, have been proven to degrade formaldehyde. However, the conversion rate of manganese dioxide to formaldehyde at room temperature is very low, which seriously limits its practical application.
[0004] Researchers have taken a lot of measures to improve the catalytic performance of manganese dioxide, for example, doping manganese dioxide with transition metals, etc. However, the conversion rate of manganese dioxide to formaldehyde at room temperature is still not ideal, such as Tian et al. Prepared MnO x -CeO 2 The conversion rate of mixed oxides to formaldehyde is only 27% (HCHO: 580ppm) (Appl.Catal.B:Environ., 2006,62,265) at 60°C and the space velocity is 21L / gcat h. Doped MnO 2 , when the doping ratio is 1:10, the conversion rate of formaldehyde is only ~23% at 50°C and the space velocity is 90L / gcat h (Appl.Catal.B:Environ.,2017,211,212 )

Method used

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  • Manganese dioxide composite material, and preparation method and application thereof
  • Manganese dioxide composite material, and preparation method and application thereof
  • Manganese dioxide composite material, and preparation method and application thereof

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preparation example Construction

[0046] The present invention further provides a preparation method of manganese dioxide composite material, comprising:

[0047] S1, providing permanganate, a saccharide compound and a solvent in which both the permanganate and the saccharide compound can be dissolved; and

[0048] S2, mixing the permanganate, the saccharide compound and the solvent to form a reaction solution, and reacting the reaction solution at 40°C to 100°C to obtain the manganese dioxide composite material.

[0049] In step S1, the permanganate may include at least one of potassium permanganate, sodium permanganate, calcium permanganate, lithium permanganate, barium permanganate, zinc permanganate and magnesium permanganate A sort of. Preferably, the permanganate may be at least one of potassium permanganate, sodium permanganate and calcium permanganate. More preferably, the permanganate may be potassium permanganate.

[0050] The saccharide compound may be at least one of monosaccharides, disaccharid...

Embodiment 1

[0065] Weigh 1.2g of potassium permanganate and dissolve it in an Erlenmeyer flask containing 100mL of water, then weigh 0.18g of glucose and add it to the above solution, and place the Erlenmeyer flask containing the reaction solution in a water bath at 80°C for 15 minutes to react. After the reaction, the solid in the Erlenmeyer flask was centrifugally washed, dried at 105° C. for 12 h, and ground to obtain manganese dioxide composite material powder (GLC-MnO 2 ).

[0066] For the GLC-MnO 2 Characterize the performance, the results are as follows Figure 1 to Figure 6 and shown in Table 1.

[0067] Static degradation test of formaldehyde:

[0068] Weigh GLC-MnO 2 100mg, placed in the plexiglass reactor of 3.5L, and described catalyzer is sealed with airtight lid, pours a certain amount of formaldehyde into the plexiglass reactor, makes the formaldehyde concentration after equilibrium be about 200ppm. Open the sealing cover, make the catalyst and formaldehyde contact eac...

Embodiment 2

[0075] Weigh 1.2g of potassium permanganate and dissolve it in an Erlenmeyer flask containing 100mL of water, then weigh 0.34g of sucrose and add it to the above solution, and place the Erlenmeyer flask containing the reaction solution in a water bath at 80°C for 15min. After the reaction, the solid in the Erlenmeyer flask was centrifugally washed, dried at 105° C. for 12 h, and ground to obtain manganese dioxide composite material powder (AC-MnO 2 ).

[0076] For the AC-MnO 2 Characterize the performance, the results are as follows Figure 1 to Figure 6 and shown in Table 1.

[0077] Adopt the method identical with embodiment 1 to carry out the static degradation test of formaldehyde, the result is as follows Figure 7 shown.

[0078] Adopt the method identical with embodiment 1 under 55% relative humidity, formaldehyde initial concentration is 1.0mg / m 3 Carry out the dynamic degradation test of formaldehyde under the condition of condition, the result is as follows Fi...

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Abstract

The invention discloses a manganese dioxide composite material. The manganese dioxide composite material is composed of delta-MnO2 nano sheets and nano secondary particles assembled by nano carbon, wherein the nano secondary particles have a porous structure. The invention also provides a preparation method of the manganese dioxide composite material and an application of the manganese dioxide composite material in removing formaldehyde. The manganese dioxide composite material provided by the invention can rapidly catalyze the degradation of formaldehyde at a low temperature / room temperature,and the removal rate of formaldehyde is high. The preparation method of the manganese dioxide composite material provided by the invention is simple and is easy to operate, and the production cost islow.

Description

technical field [0001] The invention relates to the field of materials, in particular to a manganese dioxide composite material and its preparation method and application. Background technique [0002] As an important chemical raw material, formaldehyde is widely used in various fields of life, especially decoration, decoration materials and furniture. Therefore, formaldehyde is widely exposed to indoor environments such as our life, work, and leisure. Formaldehyde in indoor environments pollution is widely concerned by the public. Based on a large number of human and animal experiments, the International Agency for Research on Cancer found that formaldehyde is extremely harmful to the human body and classified it as a class I carcinogen. Therefore, the level of formaldehyde in indoor air directly affects the health of people who have been active indoors for a long time. healthy. Aiming at the characteristics of low concentration and long release cycle of formaldehyde, peo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/02B01D53/86B01D53/72B01J35/00
CPCB01D53/8668B01J23/34B01D2259/4508B01J35/40
Inventor 张彭义刘芳高乐乐
Owner TSINGHUA UNIV
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