Charcoal and preparation method thereof as well as method for removing lead in water by using charcoal

A technology of biochar and water body, applied in the direction of chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of high cost, complicated preparation of raw materials, unfavorable for industrial production, etc., and achieve low cost, good adsorption effect, removes the effect that is noticeable

Inactive Publication Date: 2018-02-06
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of raw materials by this method is complicated, and the cost is high, which is unfavorable for industrial production

Method used

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  • Charcoal and preparation method thereof as well as method for removing lead in water by using charcoal
  • Charcoal and preparation method thereof as well as method for removing lead in water by using charcoal

Examples

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preparation example Construction

[0025] A kind of preparation method of biochar that one embodiment of the present invention proposes, it comprises the following steps:

[0026] 1) Washing the caragana, drying, pulverizing, and extruding to obtain the caragana segment;

[0027] 2) Under the condition of atmosphere protection, the temperature of the caragana section is programmed, pyrolyzed, and cooled to obtain a crude product; the crude product is pulverized and sieved to obtain biochar; wherein, the pyrolysis temperature is 550- 680°C.

[0028] Among them, caragana is rich in cellulose, cellulose and lignin, etc., and the prepared biochar has high adsorption performance. Caragana segments crushed and then extruded compared with Caragana segments directly cut into segments, the former has better thermal conductivity and higher degree of pyrolysis, and the prepared biochar has better performance of adsorbing lead ions.

[0029] As a preference of the above embodiment, the length of the caragana section in t...

Embodiment 1

[0040] 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.

[0041] After adding the prepared biochar in an amount of 2g / L to the water body with a pH of 7 and a lead concentration of 200ppm, immediately seal the water body, shake it on a constant temperature shaker at 25°C for 4 hours, filter, and take the supernatant to measure Pb 2+ content.

[0042] The specific surface area, the percentage content of phenolic hydroxyl groups, and the removal rate of lead in water of the biochar of this embodiment are shown in Table 1.

Embodiment 2

[0044] 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.

[0045] After adding the prepared biochar in an amount of 2g / L to the water body with a pH of 7 and a lead concentration of 200ppm, immediately seal the water body, shake it on a constant temperature shaker at 25°C for 4 hours, filter, and take the supernatant to measure Pb 2+ content.

[0046] The specific surface area, the percentage content of phenolic hydroxyl groups, and the removal rate of lead in water of the biochar of this embodiment are shown in Table 1.

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Abstract

The invention relates to charcoal and a preparation method thereof and a method for removing lead in water by using the charcoal. The method comprises the following steps: 1) washing caragana microphylla, drying, crushing, extruding molding, and thus obtaining caragana microphylla sections; 2) under an atmosphere protection condition, heating, pyrolysing and cooling the caragana microphylla sections to obtain a crude product; crushing the crude product, and sieving to obtain charcoal, wherein the pyrolysis temperature is 550 to 680 DEG C. The charcoal prepared in the invention is wide in source of raw material caragana microphylla, low in cost, capable of converting waste into treasure and reducing the production cost and simple and easy in preparation method; the raw material caragana microphylla in the invention is rich in cellulose and lignin, so that the adsorption performance of the prepared charcoal for the lead in water is high, and the lead removal rate is 89.42 to 99.87 percent; moreover, the charcoal of the invention is convenient to recover and free from causing secondary pollution.

Description

technical field [0001] The invention relates to a biochar, in particular to a biochar, a preparation method thereof and a method for removing lead in a water body. Background technique [0002] Lead is currently one of the most common heavy metal elements that are most harmful to humans and plants. Lead has low solubility in soil and long residence time. It is a non-degradable environmental pollutant. After accumulating in topsoil, it not only affects the yield and quality of crops, but also transforms into more toxic compounds under the action of some microorganisms. It enters the human body through the food chain and affects human health. After entering the human body, lead is mainly stored in bones, and a small amount is distributed in kidneys, nerves and muscle tissues. Acute lead poisoning can cause symptoms such as headache, dizziness, anemia, lethargy, limb aches and abdominal cramps, while chronic lead poisoning can cause It can cause symptoms such as neurasthenia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F101/20
Inventor 郑纪勇王彤彤周晓燕张兴昌
Owner NORTHWEST A & F UNIV
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