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Porous charcoal adsorbent and preparation method of same

An adsorbent and porous carbon technology, applied in the field of porous carbon adsorbent and its preparation, can solve the problems of poor physical strength, low content of surface active components, unsatisfactory adsorption effect, etc., and achieves mild conditions, simple preparation process, and reaction controllable effects

Inactive Publication Date: 2018-12-07
马鞍山中粮生物化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the high porosity and large specific surface area of ​​corn by-products, and the surface of lignin, cellulose, hemicellulose and other ingredients contained in corn by-products contains active functional groups such as hydroxyl and carboxyl groups, people use them as Adsorbents are used to treat dyes and heavy metal ions in wastewater. However, if they are used directly, the adsorption effect is not ideal. The reason is that the content of surface active components is relatively small, and for corn by-products, its physical strength is relatively poor , fragile during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of porous carbon adsorbent, comprises the following steps:

[0022] 1) Take 5 parts of biomass powder obtained after drying and pulverizing corn stalks, corn silk and corncobs to 200 mesh, the volume ratio is 6:1, the volume fraction is 85% acetic acid and the volume fraction is 10% nitric acid 2 parts of mixed solution, 5 parts of nitric acid with a concentration of 3mol / L, and 3 parts of manganese nitrate solution with a volume fraction of 30%;

[0023] 2) Soak the biomass powder in a mixed acid solution for 30 minutes and wash it 3 times with ethanol with a volume fraction of 95%;

[0024] 3) Carbonizing the cleaned biomass powder at 400° C. for 3 hours in a nitrogen environment and washing it with water to obtain a carbon matrix;

[0025] 4) Acidify the carbon substrate with nitric acid for 10 h, then dry it, soak the carbon substrate in manganese nitrate solution for 24 h, and then calcinate at 400° C. for 1 h.

Embodiment 2

[0027] The preparation method of porous carbon adsorbent, comprises the following steps:

[0028] 1) Weigh 3 parts of biomass powder obtained after drying and pulverizing corn stalks, corn silk and corn cobs to 100 mesh, the volume ratio is 6:1, the volume fraction is 85% acetic acid and the volume fraction is 10% nitric acid 1 part of mixed solution, 5 parts of nitric acid with a concentration of 1mol / L, and 3 parts of manganese nitrate solution with a volume fraction of 20%;

[0029] 2) Soak the biomass powder in a mixed acid solution for 20 minutes and wash it twice with ethanol with a volume fraction of 95%;

[0030] 3) Carbonizing the cleaned biomass powder at 200° C. for 2 hours in a nitrogen environment and washing it with water to obtain a carbon matrix;

[0031] 4) Acidify the carbon substrate with nitric acid for 10 h, then dry it, soak the carbon substrate in manganese nitrate solution for 12 h, and then calcinate at 300° C. for 1 h.

Embodiment 3

[0033] The preparation method of porous carbon adsorbent, comprises the following steps:

[0034] 1) Weigh 5 parts of biomass powder obtained after drying and crushing corn stalks, corn silk and corn cobs to 100-300 mesh, the volume ratio is 8:1, the volume fraction is 85% acetic acid and the volume fraction is 10% 2 parts of mixed solution of nitric acid, 8 parts of nitric acid with a concentration of 3mol / L, and 5 parts of manganese nitrate solution with a volume fraction of 50%;

[0035] 2) Soak the biomass powder in a mixed acid solution for 30 minutes and wash it 3 times with ethanol with a volume fraction of 95%;

[0036] 3) Carbonizing the cleaned biomass powder at 500° C. for 5 hours in a nitrogen environment and washing it with water to obtain a carbon matrix;

[0037] 4) The carbon substrate was acidified with nitric acid for 15 hours and then dried, and the carbon substrate was soaked in manganese nitrate solution for 36 hours and then calcined at 400° C. for 1.5 h...

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Abstract

The invention discloses a porous charcoal adsorbent produced from, by weight, 3-5 parts of biomass powder, 1-2 parts of mixed acid liquid, 5-8 parts of nitric acid, and 3-5 parts of a manganese nitrate solution. A method includes: weighing the raw materials, soaking the biomass powder in the mixed acid liquid and washing the biomass powder with 95 vol% ethanol for 2-3 times; carbonizing the cleaned biomass powder and washing the carbonized product with water, thus preparing a carbon substrate; acidifying the carbon substrate with the nitric acid and drying the carbon substrate, and soaking thecarbon substrate in the manganese nitrate solution; finally calcining the carbon substrate to prepare the porous charcoal adsorbent. In the invention, adsorption effect and large specific surface area of the active charcoal and catalytic effect of the manganese oxide are effectively combined, so that the product has great adsorption effect and catalytic activity, can effectively reduce concentration of organic waste gas and finally degrades the harmful gas.

Description

technical field [0001] The invention belongs to the field of adsorbent preparation, and in particular relates to a porous carbon adsorbent and a preparation method thereof. Background technique [0002] In decoration and industrial production, a large amount of volatile harmful gases, such as benzene, toluene, xylene and other benzene series, will be discharged into the air. Benzene series are particularly harmful to the human body. At present, benzene series compounds have been identified as strong carcinogens by the World Health Organization. Especially in the process of industrial production and processing, the volatile organic waste gas pollutants produced have the characteristics of large emissions, low concentrations, and complex components. [0003] The fundamental way to remove organic waste gas is to adopt non-polluting technology, use less or no harmful raw materials, control waste gas emissions, and recycle or harmlessly treat organic waste gas. According to dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/86B01D53/88
CPCB01D53/86B01D53/88B01J20/20B01J20/28054B01J20/3078B01D2257/40
Inventor 唐宏泉汪建军刘贤顺
Owner 马鞍山中粮生物化学有限公司
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