Corn cob modified activated carbon adsorption material for soil heavy metals and preparation method of adsorption material
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An adsorption material and corn cob technology, applied in the field of soil pollution ecological restoration, to achieve the effects of promoting crop growth, easy operation, and increasing soil fertility
Active Publication Date: 2020-02-04
竹溪县环境监测站
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[0004] In view of the above-mentioned existing problems, the purpose of the present invention is to solve the defects existing in the existing soil heavy metal pollution treatment materials, using corncobs
Method used
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preparation example Construction
[0024] A kind of preparation method of corncob modified activated carbon soil heavy metal adsorption material, corncob is dried, after potassium permanganate solution, sodium hydroxide solution and potassium hydroxide solution are prepared, described preparation method is according to the following steps:
[0025] a. Take the dried corncob and immerse it in the potassium permanganate solution with a concentration of 0.5wt%-2wt% for 30 minutes, take it out, dry it, and put the corncob uniformly adsorbed with potassium permanganate under nitrogen atmosphere at 3~8℃ Heating at a heating rate of 1 / min to 250-350°C and holding for 40-80 minutes to obtain corn cob charcoal;
[0026] b. Immerse the corn cob charcoal obtained in step a in a sodium hydroxide or potassium hydroxide solution with a concentration of 0.5wt%-2wt% for 30min, then take it out and dry it.
[0027] In the above-mentioned preparation step a, the corn cob is immersed in the potassium permanganate solution with a ...
Embodiment 1
[0031] a. Take the dried corncobs and immerse them in 0.5wt% potassium permanganate solution for 30 minutes, take them out, dry them, and put the corncobs uniformly adsorbed with potassium permanganate under a nitrogen atmosphere at a heating rate of 3°C / min Heating to 350°C and keeping it warm for 80 minutes to obtain corn cob charcoal;
[0032] b. Immerse the corncob charcoal obtained in step a in a 0.5 wt% sodium hydroxide or potassium hydroxide solution for 30 minutes, then take it out and dry it.
Embodiment 2
[0034] a. Take the dried corncobs and immerse them in 1wt% potassium permanganate solution for 30 minutes, take them out, dry them, and then heat the corncobs evenly adsorbed with potassium permanganate under a nitrogen atmosphere at a heating rate of 6°C / min To 300 ℃, keep warm for 60 minutes to obtain corncob charcoal;
[0035] b. Immerse the corn cob charcoal obtained in step a in a 1wt% concentration of sodium hydroxide or potassium hydroxide solution for 30 minutes, then take it out and dry it.
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Abstract
The invention relates to a corn cob modified activated carbon adsorption material for soil heavy metals and a preparation method of the adsorption material, and belongs to the technical field of soilpollution ecological restoration. The corn cob modified activated carbon adsorption material for the heavy metals has a porous carbon material with a corn cob structure, and is prepared by the following steps: after dried corn cob adsorbs a potassium permanganate solution, performing drying, performing pyrolysis in a nitrogen protective atmosphere to obtain corn cob-shaped biochar, dipping the corn cob-shaped biochar into a sodium hydroxide or potassium hydroxide solution, and performing drying to obtain the corn cob modified activated carbon adsorption material for the heavy metals. The adsorption material has a volume and strength similar to those of the corn cob, is very convenient for landfilling and recycling when soil is ploughed, has a good adsorption effect on the heavy metals in the soil, high efficiency and less time consumption, can permanently remove the heavy metals that contaminate the soil, does not cause secondary pollution to the soil after being used for multiple times, and can enhance soil fertility; and the preparation method provided by the invention has a simple process and simple operation, and is convenient for large-scale industrial production and application.
Description
technical field [0001] The invention relates to a corn cob modified activated carbon used for soil heavy metal adsorption, and belongs to the technical field of soil pollution ecological restoration. Background technique [0002] In recent years, soil pollution has become increasingly serious, which has seriously affected the yield and quality of agricultural products. Heavy metal pollution is a major aspect of soil pollution. Protecting cultivated land and ensuring food safety have become the focus of people's attention. There are endless researches on the prevention and control of heavy metals in soil and technological restoration, but in general, there are basically two types of treatment for heavy metal pollution at home and abroad: one is "removal", which removes heavy metals from the environmental medium; the other is "fixation". ", change the existing form of heavy metal elements, reduce their activity and bioavailability, and passivate heavy metals. At present, th...
Claims
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