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Biochar with high electron exchange capacity, and preparation method thereof

A technology of exchange capacity and biochar, applied in the fields of electron exchangers, biofuels, chemical instruments and methods, etc., can solve the problems such as no modification or activation method of electron exchange capacity, many drugs added, and complicated processes, so as to promote biological Transformation rate and microbial activity, energy saving, simple operation effect

Active Publication Date: 2020-07-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, a series of methods have been developed at home and abroad for directional modification or activation of biochar. For example, the Chinese invention patent with publication number CN109499542A discloses a preparation method and application of a modified biochar composite material modified by magnetic hydrotalcite. The Chinese invention patent with the publication number CN108262022A discloses a modified biochar and its preparation method. Although the existing technology exists to regulate the characteristics of biochar by controlling the temperature, the purpose of modification is to improve the adsorption performance of biochar. Modification or activation method of exchange capacity
In addition, none of the existing technologies optimize the composition of biomass at the front end from the perspective of biochemical composition, but only make biochar matrix through pyrolysis of biomass and then carry out subsequent modification or activation process. More complex and energy-intensive

Method used

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  • Biochar with high electron exchange capacity, and preparation method thereof
  • Biochar with high electron exchange capacity, and preparation method thereof
  • Biochar with high electron exchange capacity, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The biomass raw material to prepare biochar is a mixture of thatch grass and Mendong grass, and its biomass composition is tested: the cellulose content is 63% dw, the starch content is 0%, and the lignin content is 13% dw, which is a cellulosic biomass. substance.

[0038] If the target biochar whose electron exchange ability is electron-donating ability is directional prepared, it is not necessary to optimize the thatch grass, and the whole amount of thatch grass is directly ground and passed through a 200-mesh sieve, and fully mixed to obtain the biomass to be pyrolyzed; Biomass samples were pyrolyzed at 300°C for 1 hour, 400°C for 1 hour, and 500°C for 30 minutes. During the pyrolysis process, inert gas was continuously introduced to keep the oxygen concentration below 10ppm. After the pyrolysis was completed, the target Biochar A1, B1, C1.

[0039] If the target biochar whose electron exchange ability is the ability to obtain electrons is directional prepared, the...

Embodiment 2

[0042] The biomass raw material to prepare biochar is a mixture of potatoes and flour, and its biomass composition was tested: the starch content is 74% dw, the cellulose content is 1% dw, and the lignin content is 2%, which is starchy biomass.

[0043] If the target biochar whose electron exchange capacity is electron-donating capacity is directional prepared, there is no need to optimize the biomass raw material, and the biomass raw material is directly ground and passed through a 200-mesh sieve, and fully mixed evenly to obtain the biomass to be pyrolyzed; then The biomass sample to be pyrolyzed was pyrolyzed at 700°C for 30 minutes. During the pyrolysis process, the inert gas was continuously introduced to keep the oxygen concentration below 10 ppm. After the pyrolysis was completed, the target biochar A2 was obtained.

[0044] If the target biochar whose electron exchange capacity is the ability to obtain electrons is directional prepared, there is no need to optimize the ...

Embodiment 3

[0047] The biomass raw material to prepare biochar is pine wood, and its biomass composition was tested: the lignin content is 36% dw, the cellulose content is 30% dw, and the starch content is 0%, which is lignin biomass. The electron exchange ability of the obtained target biochar can only be the biochar with electron ability. Therefore, there is no need to optimize the pine wood, and the pine wood is directly ground and passed through a 200-mesh sieve, and fully mixed to obtain the biomass to be pyrolyzed; then three samples of the biomass to be pyrolyzed are taken and pyrolyzed at 500°C for 1 hour respectively , pyrolysis at 600°C for 1 hour, and pyrolysis at 700°C for 30 minutes. During the pyrolysis process, the inert gas was continuously introduced to keep the oxygen concentration below 10ppm. After the pyrolysis was completed, the target biochars A3, B3, and C3 were obtained respectively.

[0048] The electron exchange capacity, surface redox functional group content a...

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Abstract

The invention discloses a biochar with a high electron exchange capacity, and a preparation method thereof, and belongs to the field of environmental engineering materials. The method comprises the following steps: testing biochemical components contained in a biomass raw material to be used for preparing biochar; determining whether the biomass raw material needs to be optimally blended or not according to the electron exchange capacity of the target charcoal and the composition of the biomass raw material; if optimal blending is needed, determining the optimal formula direction according tothe composition of the biomass raw material, and then adding a proper biomass optimal blending biomass raw material, grinding the optimally blended mixture; if optimal blending is not needed, directlygrinding the biomass raw material, sieving the ground raw material in a full amount, and fully and uniformly mixing to obtain biomass to be pyrolyzed; and finally, selecting corresponding pyrolysis temperature and pyrolysis time for pyrolysis according to the composition of the biomass to be pyrolyzed and the electron exchange capacity of the target biochar, and pyrolyzing so as to obtain the target biochar with high electron exchange capacity. The method disclosed by the invention is low in energy consumption and can be used for directionally preparing the biochar with high electron exchangecapacity.

Description

technical field [0001] The invention specifically relates to a biochar with high electron exchange capacity and a preparation method thereof, belonging to the field of environmental engineering materials. Background technique [0002] Studies have found that biochar can promote the biotransformation of organic pollutants, such as the degradation of polychlorinated biphenyls [Wu, S., et al. Redox-active oxygen-containing functional groups in activated carbonfacilitate microbial reduction of ferrihydrite. Environmental Science & Technology. 2017, 51(17):9709-9717.], Anaerobic digestion of organic waste [Cruz Viggi, C., et al. Enhancing methane production from food waste fermentate using biochar: The added value of electrochemical testing in pre-selecting the most effective type of biochar. Biotechnology for Biofuels.2017,10(1):303.] and biomethane oxidation [Zhang,X., et al.Biochar-mediated anaerobic oxidation of methane.Environmental Science & Technology.2019,53:6660-6668.], ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02B01J47/015C02F3/00C02F101/30
CPCB01J47/015C02F3/00C02F2101/30C10B53/02Y02E50/10
Inventor 何品晶李莎莎邵立明吕凡章骅郝丽萍
Owner TONGJI UNIV
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