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
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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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