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Hydrothermal synthesis method of alpha-MnO2 with high purity and large specific surface area

A technology of hydrothermal synthesis and hydrothermal kettle, applied in separation methods, chemical instruments and methods, manganese oxide/hydroxide, etc., can solve the problems of short life, untimely replacement of filters, secondary pollution, etc., and achieve high performance Excellent and good formaldehyde degradation activity effect

Active Publication Date: 2019-11-22
GUANGDONG MIDEA WHITE GOODS TECH INNOVATION CENT CO LTD +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the purification odor in air purification products is still absorbed by ordinary activated carbon filter, which has a short life and often causes secondary pollution due to untimely replacement of the filter.

Method used

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  • Hydrothermal synthesis method of alpha-MnO2 with high purity and large specific surface area
  • Hydrothermal synthesis method of alpha-MnO2 with high purity and large specific surface area
  • Hydrothermal synthesis method of alpha-MnO2 with high purity and large specific surface area

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preparation example Construction

[0032] an α-MnO 2 The hydrothermal synthesis method comprises the following operations:

[0033] 1) Prepare a reducing agent solution with a molar concentration of 0.05-2M;

[0034] 2) Add permanganate into the reducing agent solution, the molar ratio of permanganate to the reducing agent is 1: (1.5-15), preferably 1: (1.5-2), and mix evenly to obtain a mixed solution ;

[0035] 3) Put the mixed solution in a hydrothermal kettle, and carry out a hydrothermal synthesis reaction at 120-200°C;

[0036] 4) After the reaction is completed, separate the solid and liquid to obtain α-MnO 2 .

[0037] In some examples of hydrothermal synthesis methods, the following operations are included:

[0038] 1) Prepare a reducing agent solution with a molar concentration of 0.05-1M;

[0039] 2) adding permanganate into the reducing agent solution, the molar ratio of permanganate to the reducing agent is 1: (1.5-15), and mixing evenly to obtain a mixed solution;

[0040] 3) Put the mixed ...

Embodiment 1

[0056] 1) preparing a reducing agent solution with a molar concentration of 0.5M, wherein the reducing agent is glucose;

[0057] 2) adding permanganate into the reducing agent solution, the molar ratio of permanganate to the reducing agent is 1:6, and mixing evenly to obtain a mixed solution;

[0058]3) Put the mixed solution in a hydrothermal kettle, and conduct a hydrothermal synthesis reaction at 140° C. for 12 hours;

[0059] 4) After the reaction is completed, separate the solid and liquid to obtain α-MnO 2 .

Embodiment 2

[0061] 1) preparing a reducing agent solution with a molar concentration of 0.05M, the reducing agent being manganese sulfate;

[0062] 2) adding permanganate into the reducing agent solution, the molar ratio of permanganate to the reducing agent is 1:1.5, and mixing evenly to obtain a mixed solution;

[0063] 3) Put the mixed solution in a hydrothermal kettle, and conduct a hydrothermal synthesis reaction at 180° C. for 10 hours;

[0064] 4) After the reaction is completed, separate the solid and liquid to obtain α-MnO 2 .

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Abstract

The invention discloses a method for synthesizing alpha-MnO2. By controlling the variety of a reducing agent, a dosage ratio and reaction conditions, the alpha-MnO2 with high crystal form purity can be unexpectedly obtained and the prepared alpha-MnO2 has a very high specific surface area, and compared with other manganese dioxide on the market, can efficiently degrade formaldehyde with a stable degradation efficiency.

Description

technical field [0001] The present invention relates to a preparation method of a material, in particular to a kind of α-MnO 2 hydrothermal synthesis method. Background technique [0002] Formaldehyde is one of the most important indoor pollutants, mainly from various wood-based panels and interior decoration materials. At present, the purification odor in air purification products is still absorbed by ordinary activated carbon filters, which have a short life and often cause secondary pollution due to untimely replacement of filters. [0003] Manganese dioxide is a well-known substance capable of removing formaldehyde at room temperature, and is widely used in the preparation of formaldehyde-removing materials. Studies have shown that manganese dioxide can catalyze the oxidation of formaldehyde to decompose it into carbon dioxide and water. The crystal structure of manganese dioxide is complex, and there are five main crystals such as α, β, and γ, and more than 30 kinds ...

Claims

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Application Information

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IPC IPC(8): C01G45/02B01D53/86B01D53/72
CPCC01G45/02B01D53/8668C01P2006/80C01P2006/12C01P2002/72C01P2004/61B01D2258/06
Inventor 杨翠霞
Owner GUANGDONG MIDEA WHITE GOODS TECH INNOVATION CENT CO LTD
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