Silver-activated carbon composite material and preparation method thereof

A composite material and activated carbon technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problem of unsatisfactory formaldehyde removal effect, save filter material preparation costs, simplify filter material preparation steps, and reduce operational hazards low effect

Active Publication Date: 2021-03-16
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there is technology to load Ag on the activated carbon carrier to form a composite adsorption material, but the composite formed material is not ideal for the removal of formaldehyde.

Method used

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  • Silver-activated carbon composite material and preparation method thereof
  • Silver-activated carbon composite material and preparation method thereof
  • Silver-activated carbon composite material and preparation method thereof

Examples

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preparation example Construction

[0022] In a typical implementation of the present application, a method for preparing a silver-activated carbon composite material is provided, the preparation method comprising: step S1, mixing the silver salt solution and activated carbon for impregnation and reduction treatment to obtain a suspension; step S2 , carry out gradient drying on the suspension to obtain silver-activated carbon composite materials, the temperature of gradient drying is between 40-120°C, the total time is 1-24h, gradient drying includes multiple drying sections, and the drying temperature of each drying section gradually increases high.

[0023] In the process of preparing the silver-activated carbon composite material, the present invention adopts a gradient drying method, keeps a certain time at a lower temperature for the first gradient drying treatment, and then gradually raises the temperature for drying. The problem of unstable load caused by long-term low-temperature drying and negative impa...

Embodiment 1

[0037] 1) Weigh 0.02g of silver nitrate, dissolve it in 50mL of deionized water, shading and stirring to dissolve, after the dissolution is completed, add 1g of activated carbon and continue to stir, stir at a stirring rate of 500r / min for 30min, stop stirring and let stand for 60min.

[0038] 2) Suction filter and wash the suspension obtained above to obtain a solid precipitate, and then dry the obtained solid precipitate, which is the activated carbon filter material, using a gradient drying method. The specific process is: 60 ° C for 2 hours →Dry at 80°C for 2h→Dry at 100°C for 2h. After drying, cool to room temperature and seal and store to obtain a silver-activated carbon composite catalyst.

Embodiment 2

[0040] The difference from Example 1 is that the specific drying process is: drying at 80°C for 0.5h→drying at 120°C for 0.5h.

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Abstract

The invention provides a silver-activated carbon composite material and a preparation method thereof. The preparation method comprises the steps that S1, a silver salt solution and activated carbon are mixed for dipping reduction treatment, and suspension liquid is obtained; and S2, the suspension liquid is subjected to gradient drying so as to obtain the silver-activated carbon composite material, wherein a gradient drying temperature ranges from 40 DEG C to 120 DEG C, the total gradient drying time ranges from 1 h to 24 h, gradient drying comprises a plurality of drying sections, and the drying temperature of each drying section is gradually increased. By means of the gradient drying method, the problems that load is unstable due to long-time low-temperature drying, silver ion reductionis negatively affected due to direct high-temperature drying, and the structure of activated carbon is damaged in the prior art are solved. Therefore, firm loading of nano-silver on the activated carbon is guaranteed, the porous performance of the activated carbon is effectively guaranteed, and the formaldehyde removal performance of the composite material is obviously improved compared with the formaldehyde removal performance of a composite material obtained through single-temperature drying.

Description

technical field [0001] The invention relates to the technical field of methanol removal materials, in particular to a silver-activated carbon composite material and a preparation method thereof. Background technique [0002] Formaldehyde (HCHO) is a common volatile organic compound in indoor air, which seriously endangers human health. Therefore, the removal and treatment of formaldehyde pollution in indoor air has very important research significance. The main component used in air purifier filters today is activated carbon. For pure activated carbon filter materials, formaldehyde is mainly removed by adsorption, and the service life is limited by the amount of adsorption saturation. Moreover, once activated carbon reaches adsorption saturation, it may produce toxic substances, which are harmful to the human body. healthy. Studies have shown that formaldehyde can be completely converted into non-toxic and harmless CO through catalytic oxidation technology 2 and H 2 O, an...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01D53/86B01D53/72
CPCB01D53/8668B01D2255/104B01D2257/708B01J23/50
Inventor 金星王贤波刘江胡康泽林萍
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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