A method for preparing microporous activated carbon from semi-dry silage straw

A semi-dry silage, activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of low utilization rate of mature plants, few microporous activated carbon, and no effective utilization, etc., and is conducive to adsorption. Removal, good economic value and environmental benefit, low cost effect

Active Publication Date: 2018-10-12
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activated carbon prepared by the prior art is mostly mixed with mesopores and micropores, and there are few special microporous activated carbons.
[0003] Agricultural stalks are used as biomass energy, except for a small part as feed, most of them are disposed of by open burning at the edge of the field, which has not been effectively used, not only wasting energy, but also polluting the atmosphere
Similar to agricultural straw, wetland plants such as reeds and cattails have extremely low utilization rate of harvested mature plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Pre-treatment of raw materials: After the corn is mature and the fruit is harvested, harvest the corn stalks (avoid rainy days), crush the stalks into 20mm pieces, and dry them in a sunny and ventilated place to reduce the moisture to 50%. dry silage. The method of semi-dry silage is: put the straw into the silage jar for compaction, seal it with a plastic film, and then store it in a mud seal, control the temperature at 20°C to ensure microbial fermentation, keep away from light and ensure sealing, and silage for 20 days. After opening, the stalks are yellow-green, soft and slightly moist, and have a sour taste of strong wine, which proves the success of the semi-dry silage.

[0020] Preparation of activated carbon: put semi-dry silage corn stalks in an oven at 80°C, dry them to constant weight, and grind them to 60 meshes with a pulverizer. Put the raw material into 85% phosphoric acid solution for immersion for 10 hours, and the mass ratio of raw material to phospho...

Embodiment 2

[0024] Reed stalks are used as raw materials, and the pretreatment method of the raw materials is consistent with that of Example 1. The semi-dry silage reed stalks were dried in an oven at 90°C to constant weight, crushed to 80 mesh with a pulverizer, and soaked in a phosphoric acid solution with a mass fraction of 85% for 12 hours. The mass ratio of raw materials to phosphoric acid was 1:2. The impregnated raw materials were placed in a muffle furnace, carbonized and activated at 600 °C for 60 min, and cooled naturally to room temperature. Rinse with deionized water until the pH is 7.0, perform suction filtration, separate the solid from the liquid, and dry the solid in an oven at 90°C to constant weight to obtain semi-dry silage reed microporous activated carbon.

[0025] Experimental results: The carboxyl groups and phenolic hydroxyl groups of activated carbon prepared by using semi-dry silage straw increased significantly. According to Boehm titration, the total acid gr...

Embodiment 3

[0027] Pre-treatment of raw materials: Harvest the cattail stalks (avoid rainy days), crush the stalks into 30mm pieces, and dry them in a sunny and ventilated place to reduce the moisture content to 40% for semi-dry silage. The method of semi-dry silage is: put the straw into the silage jar for compaction, seal it with a plastic film, and then store it in a mud seal, control the temperature at 20°C to ensure microbial fermentation, keep away from light and ensure sealing, and silage for 25 days. After opening, the stalks are yellow-green, soft and slightly moist, and have a sour taste of strong wine, which proves the success of the semi-dry silage.

[0028] Preparation of activated carbon: semi-dry silage of cattail stalks was dried in an oven at 100°C until constant weight, and then pulverized to 100 mesh with a pulverizer. Put the raw material into 85% phosphoric acid solution for 12 hours, and the mass ratio of raw material to phosphoric acid is 1:1. The impregnated raw m...

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Abstract

The invention relates to a method for preparing micropore activated carbon through semi-dried silaging straw. The method comprises the following steps of: (1) taking fresh plant straw, crushing the taken plant straw to 20-30mm, airing the crushed plant straw until the water content is 40-55%, and performing semi-dried silaging; (2) drying the semi-dried silaged straw to reach constant weight, performing crushing, and putting the crushed straw into phosphoric acid for impregnation; (3) putting the impregnated straw into a muffle furnace for carbonization activation, and performing cooling; and (4) performing washing with deionized water until the pH value is neutral, performing suction filtration, and performing drying so as to obtain the micropore activated carbon. According to the method disclosed by the invention, requirements for a semi-dried silaging technique adopted by the method are low, the operation is easy, the production technology is simple, the production cost is low, the prepared micropore activated carbon has many micropores which can reach 78.2%, the adsorptive property is good, acidic functional groups exist, and the adsorption and the removal of pollutants such as antibiotics and the like are facilitated.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing microporous activated carbon by using semi-dry silage straw. Background technique [0002] Activated carbon is a porous carbon material with developed pore structure and specific surface area. It is mainly composed of carbon elements, and also contains hydrogen, oxygen, sulfur, nitrogen and other elements, as well as some inorganic minerals. The adsorption of activated carbon is determined by the developed pore structure, specific surface area, and surface functional groups. Therefore, increasing the porosity can significantly improve the adsorption effect of activated carbon on pollutants. Among the various surface functional groups contained in activated carbon, the main ones that have an important impact on the adsorption performance of activated carbon are oxygen-containing functional groups and nitrogen-containing functional groups, such as ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/342
CPCC01P2006/12C01P2006/14
Inventor 徐景涛武道吉聂晨曦赵聪聪王静薛维娜丁国村
Owner SHANDONG JIANZHU UNIV
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