Method for efficiently improving electron exchange capacity of biochar

A technology of exchange capacity and biochar, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of limited improvement of biochar's electron exchange capacity, differences that have not yet reached orders of magnitude, and insignificant improvement effect. The effect of reducing the consumption of activating agents, improving the application value and reducing the discharge of secondary pollutants

Active Publication Date: 2021-04-02
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent with the publication number CN 111363573A improves the electronic exchange capacity of raw material biochar by optimizing the biomass raw material and adjusting the corresponding pyrolysis temperature, but this method is still limited in improving the electronic exchange capacity of biochar. Reaching an order of magnitude difference; the paper (Chacon, F.J., et al., Enhancing biocharredox properties through feedstock selection, metal preloading and post-pyrolysis treatments. Chemical Engineering Journal, 2020, 395) studied a variety of biochar activation methods to enhance raw material biochar The electronic exchange capacity of charcoal, which also uses KOH as an activator, but this method only loads it on the surface of biochar without subsequent pyrolysis treatment, and the improvement effect is not significant, and can only reach 2-3% of that before activation. times

Method used

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  • Method for efficiently improving electron exchange capacity of biochar
  • Method for efficiently improving electron exchange capacity of biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028](1) Pinemaking 15h at 400 ° C for 15 hours to obtain raw materials to be activated, the supply electronics of raw material bio is 0.0217 mmol / g, the electronic ability is 0.1679 mmol / g, the BET specific surface area is 3.8m2 / g;

[0029](2) The raw material to be activated is immersed in water in water in a ratio of 1: 3, and then water is filtered, then the above process is repeated three times, and then bioaccha is placed in air and dried at 105 ° C for 12h. Then, the ball grinds the bio-carbon particle size at 25 to 75 microns;

[0030](3) A mixture of solid hydroxide after the biocarbon treatment after step (2) is not less than 85%, wherein the mass ratio of the activator and the biocarbon is (2 to 12): 1, after mixing Heat stirring at 80 ° C until the black colloidal mud was formed, and the mud was pinched with 1 h at 700 ° C, and the pyrolysis process continued to pass into nitrogen to ensure an oxygen atmosphere;

[0031](4) After the mud constant temperature in step (3) is ...

Embodiment 2

[0033]The activated bio-carbon is prepared by the same method as in Example 1, which is only that the raw material to be activated is obtained by pyrolysis of 5 h at 800 ° C for 5 h. The supply of raw material bio is 0.0197 mmol / g, The electronic ability is 0.1496mmol / g, the BET specific surface area is 11m2 / g.

[0034]When the mass ratio of the biophero treated after the step (2) is 2, 4, 6, 8, 10, 12, respectively, the electronics of the activated biocompansion obtained by the present embodiment is 0.6645, respectively. 0.5267, 0.8429, 0.80937, 0.9472 and 0.8092 mmol / g, the electronic capabilities were 1.8354, 2.7869, 5.1752, 4.8356, 4.7358 and 3.892 mmol / g, Bet specific surface area is 1065, 1976, 2681, 3183, 2985, and 3041m, respectively, respectively, respectively.2 / g.

Embodiment 3

[0036]The activated biocarbon was prepared by the same method as in Example 1, which is only that the raw material to be activated is obtained by pyrolysis of 2 h at 500 ° C trimming branches at 500 ° C, and the electronics of raw material bio is 0.0247 mmol. / g, the electronic ability is 0.1827mmol / g, the BET specific surface area is 2.4m2 / g.

[0037]When the mass ratio of the biophero treated after the step (2) is 2, 4, 6, 8, 10, 12, respectively, the electronics of the activated biopco obtained by the present embodiment is 0.5023, respectively. 0.5513, 10.8946, 1.0090, 1.1823 and 0.7519 mmol / g, the electronic capacity is 2.3324, 3.9975, 5.9133, 4.2917, 4.9980 and 3.6301 mmol / g, Bet specific surface area is 1633, 2224, 2598, 3564, 3035, and 2836m, respectively.2 / g.

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Abstract

The invention discloses a method for efficiently improving the electron exchange capacity of biochar, and belongs to the technical field of environmental engineering materials. The method comprises the following steps: firstly, cleaning and drying to-be-activated raw material charcoal, and then conducting ball-milling to a certain particle size range; secondly, adding water into the treated charcoal and an activating agent in a designed mass ratio, conducting mixing, heating and stirring until black colloidal slurry is formed, pyrolyzing the slurry at a constant temperature, and continuously introducing inert gas in the pyrolysis process to ensure an oxygen-free atmosphere; and finally, carrying out constant-temperature pyrolysis on the slurry, carrying out acid leaching, and conducting cleaning and drying to obtain the activated charcoal. According to the method, the electron exchange capacity of the low-grade raw material charcoal can be remarkably improved, so that the high-grade activated charcoal is obtained, and compared with an unactivated charcoal raw material, the electron donating capacity of the activated charcoal can be improved by about 50 times to the maximum extent,and the electron obtaining capacity can be improved by more than 30 times to the maximum extent.

Description

Technical field[0001]The present invention relates to a method of efficiently improving biocarbon electronic exchange capabilities, belonging to the technical field of environmental engineering materials.Background technique[0002]In recent years, bio-carbon is used as electronic donor, electronic receptor or electronic delivery channels, is applied to pollutants degradation, metal (ion) fixed / transfer, nutrient conversion, soil repair, etc. in biological and non-biological sectors. A number of studies have found that biocarbon exchange capacity, especially for electronic ability, is a key factor affecting the above application. However, the electron exchange capacity of biochane is affected by the preparation of raw materials and pyrolysis process parameters (such as pyrolysis temperature and time) of biocarbon, and the electronic exchange capacity of biochane obtained in each study is significantly different. In addition to optimizing the raw material ratio and pyrolysis process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/378C01B32/318
CPCC01B32/348C01B32/378C01B32/318
Inventor 吕凡卢学敏何品晶李莎莎章骅邵立明
Owner TONGJI UNIV
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