Charcoal preparation method and application thereof

A technology of biochar and banana peel, applied in the direction of carbon preparation/purification, separation methods, chemical instruments and methods, etc., can solve the problems of limited pore size and low carbonization temperature of banana peel, achieve rich pore size, increase specific surface area, stable strong effect

Inactive Publication Date: 2018-04-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the carbonization temperature is low, and without other pore expansion treatment, the pore size of banana peel is still limited
[0005] It can be seen that there are still some limitations in the biochar prepared based on banana peels.

Method used

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  • Charcoal preparation method and application thereof
  • Charcoal preparation method and application thereof
  • Charcoal preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing biochar, comprising the steps of:

[0028] (1) Wash the surface of the banana peel, soak it in 10wt% sodium hydroxide solution at 50°C for 10h, the concentration of the banana peel in the solution is 1000mg / mL, and freeze-dry it at -51°C for 24h;

[0029] (2) under the Ar atmosphere that air velocity is 200sccm, the banana peel after step (1) is calcined at 1000 ℃ for 5h;

[0030] (3) Under a nitrogen atmosphere with an air velocity of 50 sccm, the carbonized material obtained after calcining was ball milled for 4 hours with a ball with a diameter of 20 mm, the ball-to-material ratio was 5:1, and the rotating speed was 30 rpm, and then passed through a 200-mesh sieve;

[0031] (4) The undersize was acid-washed in 1M hydrochloric acid, washed with water to pH=7, and collected by centrifugation to obtain biochar.

[0032] figure 1 It is a scanning electron microscope (SEM) picture of the biochar obtained in Example 1. The specific surface area of...

Embodiment 2

[0035] A method for preparing biochar, comprising the steps of:

[0036] (1) Wash the surface of the banana peel, soak it in 5wt% ammonium bicarbonate solution at 40°C for 0.5h, the concentration of the banana peel in the solution is 100mg / mL, and freeze-dry it at -51°C for 24h;

[0037] (2) under the Ar atmosphere that air velocity is 50sccm, the banana peel after step (1) is calcined at 500 ℃ for 10h;

[0038] (3) Under a nitrogen atmosphere with an air velocity of 300 sccm, the carbonized material obtained after calcining in step (2) was ball-milled for 10 h with a ball with a diameter of 10 mm, the ball-to-material ratio was 10:1, and the rotating speed was 50 rpm, and then passed through 100 mesh screen;

[0039] (4) The undersize was acid-washed in 2M hydrochloric acid, washed with water to pH=7, and collected by centrifugation to obtain biochar.

[0040] figure 2 It is a scanning electron microscope (SEM) picture of the biochar obtained in Example 2. The nitrogen c...

Embodiment 3

[0043] The preparation method of biochar comprises the following steps:

[0044] (1) Clean the surface of the banana peel, soak it in 20wt% urea solution at 10°C for 3h, the concentration of the banana peel in the solution is 800mg / mL, and freeze-dry it at -51°C for 12h;

[0045] (2) N at an air velocity of 100 sccm 2 Under the atmosphere, the banana peel treated in step (1) was calcined at 800°C for 4h;

[0046] (3) Under the ammonia gas atmosphere whose air velocity is 200 sccm, the carbonized material obtained after calcining in step (2) is ball-milled for 8 hours with a ball with a diameter of 10 mm, the ball-to-material ratio is 10:1, and the rotating speed is 60 rpm. Mesh sieve;

[0047] (4) The undersize was acid-washed in 2M nitric acid, washed with water to pH=7, and collected by centrifugation to obtain biochar.

[0048] image 3 It is a scanning electron microscope (SEM) picture of the biochar obtained in Example 3. The biochar has a large specific surface area...

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Abstract

The invention discloses a charcoal preparation method and an application thereof and belongs to the field of biological material preparation. The method specifically comprises the following steps: firstly, soaking cleaned banana peel in a solution with a pore forming agent, performing freeze-drying, calcining in an inert atmosphere, performing ball-milling in a nitrogen-containing atmosphere, screening, and finally performing acid pickling, water washing and centrifugal collection, thereby obtaining charcoal. As the pore forming agent is used before the banana peel is carbonized, a carbonizedmaterial is relatively rich in pore; the carbonized material is further subjected to ball milling in the presence of a nitrogen-containing gas, so that not only is the specific surface area of the carbonized material increased, but also a nitrogen source is introduced into the charcoal; the prepared charcoal material is good in stability, can be applied to filtration of granules and organic matters in the atmosphere and adsorption of organic matters in water, can be used as a supercapacitor electrode material, and in addition can be repeatedly used.

Description

technical field [0001] The invention belongs to the field of biological material preparation, and in particular relates to a preparation method and application of biochar. Background technique [0002] Banana peel is rich in sugar, protein, fat and various inorganic elements, and contains many pores and fibrous structures. This kind of fibrous structure can form natural mesopores (2-50nm) and Large pores (> 50nm), become a very good adsorption material and filter material. [0003] The patent "CN106147781A" (a method for preparing a solidifying agent for repairing heavy metal-contaminated soil) discloses a soil stabilizing agent mixed with carbonized banana peel and acidified sepiolite. But in this method, the processing degree to banana peel is not enough, and the concentration of 3% sodium hydroxide solution is low, can only have certain activation to banana peel, can't effectively make pores to banana peel at high temperature. [0004] The patent "CN102895952B" (a po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/32H01G11/44H01G11/86B01D46/00B01D53/02C02F1/28C02F101/30
CPCB01D46/0036B01D53/02B01D2253/102B01D2257/70C02F1/283C02F2101/30H01G11/32H01G11/44H01G11/86Y02E60/13
Inventor 杨兰黄国和陈嘉佩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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