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Biochar based on nitric nitrogen adsorption in soil and preparation method

A technology of biochar and nitrate nitrogen, applied in the restoration of contaminated soil, chemical instruments and methods, and other chemical processes, can solve the problems of unsatisfactory results, low nitrate nitrogen adsorption or removal efficiency, etc., and achieve easy Achieved by carbonization, long-lasting effects, wide-ranging effects

Inactive Publication Date: 2018-01-09
NORTHWEST A & F UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many researches on the adsorption or removal of nitrate nitrogen by biochar in China. From Table 1, it can be seen that the adsorption or removal efficiency of nitrate nitrogen by biochar is low, and the results are not ideal.

Method used

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  • Biochar based on nitric nitrogen adsorption in soil and preparation method
  • Biochar based on nitric nitrogen adsorption in soil and preparation method
  • Biochar based on nitric nitrogen adsorption in soil and preparation method

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preparation example Construction

[0029] Such as figure 1 As shown, the preparation method of biochar based on the adsorption of nitrate nitrogen in soil provided by the embodiment of the present invention comprises the following steps:

[0030] S101: Cut the caragana raw material into knuckle-sized lengths, rinse with distilled water several times, and then dry;

[0031] S102: Fill the raw materials in an iron box or an alumina crucible, seal it with a cover, and put it into a box-type atmosphere furnace for pyrolysis for 2 hours, 3 hours, and 4 hours respectively. The programmed temperature rise time is 1 hour, from room temperature to the target temperature; cool down The time is 1h, from the target temperature to room temperature;

[0032] S103: Introduce nitrogen protection to create an anaerobic environment, pyrolysis temperature is 450°C, 500°C, 550°C, 600°C, 650°C respectively, and cool to room temperature;

[0033] S104: Then crush the biochar material with a pulverizer and pass through an 18-mesh s...

Embodiment 1

[0057] Wash, dry, crush, and extrude Caragana bar to obtain about 3cm caragana section; under the condition of nitrogen protection, put the above Caragana section in an alumina crucible, cover and seal it, and put it into a box-type atmosphere furnace In the process, heat up to 550°C at a rate of 8°C / min and pyrolyze for 1 hour, then cool to room temperature to obtain a crude product; crush the crude product and pass through a 18-mesh sieve to obtain biochar with a particle size of less than 1mm.

[0058] After adding 2 g / L of the prepared biochar into the water body with a pH of 7 and a nitrate nitrogen concentration of 50 ppm, immediately seal the water body, shake it on a constant temperature shaker at 25°C for 4 hours, filter it, and take the supernatant to measure the nitrate concentration. nitrogen content.

[0059] The specific surface area of ​​the biochar in this embodiment, the percentage content of phenolic hydroxyl groups, and the removal rate of nitrate nitrogen i...

Embodiment 2

[0061] Wash, dry, crush and extrude caragana to obtain about 3cm caragana section; under the protection of argon, place the above caragana section in an alumina crucible, cover and seal it, and put it into a box-type atmosphere In the furnace, heat up to 600°C at a rate of 8°C / min and pyrolyze for 1 hour, cool to room temperature to obtain a crude product; crush the crude product and pass through a 18-mesh sieve to obtain biochar with a particle size of less than 1mm.

[0062] After adding 2 g / L of the prepared biochar into the water body with a pH of 7 and a nitrate nitrogen concentration of 50 ppm, immediately seal the water body, shake it on a constant temperature shaker at 25°C for 4 hours, filter it, and take the supernatant to measure the nitrate concentration. nitrogen content.

[0063] The specific surface area of ​​the biochar in this embodiment, the percentage content of phenolic hydroxyl groups, and the removal rate of nitrate nitrogen in water are shown in Table 4....

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Abstract

The invention discloses biochar based on nitric nitrogen adsorption in soil and a preparation method. The preparation method comprises the following steps of oven-drying caragana korshinskii; puttinginto a box-type atmosphere furnace, introducing nitrogen to create an anoxic environment, and pyrolyzing to obtain a crude product; crushing and sieving, so as to prepare efficient-adsorption biocharbased on the nitric nitrogen adsorption in the soil. The raw-material caragana korshinskii used for the biochar can be taken locally in the northwestern region, is low in cost, is easily obtained andis lasting in effect; the biochar can be also used for efficiently adsorbing NO3-N in a water environment and the prepared caragana-korshinskii biochar does not need pretreatment of elution or acidification and the like, and can be directly used.

Description

technical field [0001] The invention belongs to the technical field of novel soil improvement materials, and in particular relates to a biochar based on the adsorption of nitrate nitrogen in soil and a preparation method. Background technique [0002] At present, my country mainly uses nitrogen fertilizer as the main measure to increase agricultural production. However, with the development of agriculture, while a large amount of nitrogen fertilizer is used to increase agricultural income, the nitrogen applied to the soil enters the water body through surface runoff and leaching, causing surface water and groundwater pollution and eutrophication. On the one hand, this has aggravated soil compaction, acidification and increased agricultural input. On the other hand, it has led to water hypoxia and increased algal toxin content, threatening water biodiversity and human health. [0003] At present, the traditional methods for removing nitrate nitrogen are mainly biological met...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00
Inventor 郑纪勇周晓燕王彤彤张应龙张兴昌
Owner NORTHWEST A & F UNIV
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