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Method for modifying biochar, and application of modified biochar in soil remediation

A biochar and modification technology, applied in the field of soil remediation, can solve the problem of late heavy metal pollution in the soil, and achieve the effect of reducing the toxicity of heavy metals and achieving a significant effect of Cd remediation.

Inactive Publication Date: 2019-07-12
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic soil heavy metal pollution research started late, but developed rapidly

Method used

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  • Method for modifying biochar, and application of modified biochar in soil remediation

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Effect test

Embodiment 1

[0018] A method for modifying biochar, comprising the steps of:

[0019] 1) Mix wheat straw and fresh whole cattail plant at a weight ratio of wheat straw: cattail = 1:1, place in a muffle furnace at 600°C for 1 hour to generate biochar and pulverize it, and fill the muffle furnace with Nitrogen protection;

[0020] 2) configure the aqueous solution of maleic acid and polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of maleic acid and polyethylene glycol is respectively maleic acid 100g / L, polyethylene glycol 5g / L. The prepared biochar was first soaked in H 2 o 2 The mass percentage content is 10% hydrogen peroxide, the quality of the hydrogen peroxide used for soaking the biochar is 6 times of the mass of the biochar, after soaking for 5 minutes, filter, and then soak the solid phase in the aqueous solution of maleic acid and polyethylene glycol, maleic acid The quality of acid and polyethylene glycol aqueous solution is 6 ti...

Embodiment 2

[0025] A method for modifying biochar, comprising the steps of:

[0026] 1) Mix wheat straw and fresh whole cattail plant at a weight ratio of wheat straw: cattail = 1:2, place it in a muffle furnace for 1 hour at 600°C with limited oxygen and pyrolyze it into biochar and pulverize it, then fill the muffle furnace with Nitrogen protection;

[0027] 2) configure the aqueous solution of maleic acid and polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of maleic acid and polyethylene glycol is respectively maleic acid 130g / L, polyethylene glycol 8g / L. The prepared biochar was first soaked in H 2 o 2 The mass percentage content is 10% hydrogen peroxide, the quality of hydrogen peroxide used for soaking biochar is 6 times of the mass of biochar, filter after soaking for 6 minutes, and then soak the solid phase in the aqueous solution of maleic acid and polyethylene glycol, maleic acid The quality of acid and polyethylene glycol aque...

Embodiment 3

[0032] A method for modifying biochar, comprising the steps of:

[0033] 1) Mix wheat straw and fresh whole cattail plant at a weight ratio of wheat straw: cattail = 1:2, place it in a muffle furnace for 1 hour at 600°C with limited oxygen and pyrolyze it into biochar and pulverize it, then fill the muffle furnace with Nitrogen protection;

[0034] 2) configure the aqueous solution of maleic acid and polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of maleic acid and polyethylene glycol is respectively maleic acid 180g / L, polyethylene glycol 12g / L. The prepared biochar was first soaked in H 2 o 2 The mass percentage content is 10% hydrogen peroxide, the quality of hydrogen peroxide used for soaking biochar is 6 times of the mass of biochar, filter after soaking for 8 minutes, and then soak the solid phase in the aqueous solution of maleic acid and polyethylene glycol, maleic acid The quality of acid and polyethylene glycol aqu...

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Abstract

The invention discloses a method for modifying biochar. The method comprises the following steps: 1) carrying out oxygen-limited pyrolysis on wheat straws and fresh whole-plant Typha orientalis into biochar, and crushing the biochar; 2) immersing the prepared biochar in hydrogen peroxide first, then immersing the biochar in an aqueous solution of maleic acid and polyethylene glycol, and cooling and filtering the obtained solution to obtain a solid phase A; 3) dispersing the solid phase A in ethanol to form a suspension, and adding 2,2,6,6-tetramethylpiperidine-nitrogen-oxide and methacrylic acid to the suspension in order to obtain a solid phase B; 4) immersing the solid phase B in an aqueous solution of acetic acid, and adding potassium periodate to the obtained solution in order to obtain a solid phase C; and 5) immersing the solid phase C in a mixed solution of dimethylformamide and N-methylpyrrolidone in order to obtain modified biochar. The modification process of the biochar is optimized, the wheat straws and the Typha orientalis are used as the composite biochar, and the composite biochar is optimized and modified, so the modified biochar has a very significant Cd repairingeffect, and significantly reduces the toxicity of heavy metals in soil after being applied to the cadmium contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, and in particular relates to a biochar modification method and its application in soil restoration. Background technique [0002] At present, the situation of heavy metal pollution in my country's soil is increasing day by day, not only the degradation of soil fertility, but also the reduction of crop yield and quality, and even endangering human health. Therefore, the restoration of heavy metal pollution in soil should not be underestimated. The characteristics of heavy metal pollution are: stealth, persistence, enrichment, irreversibility and non-obvious pollution phenomenon. At present, the more common remediation methods for soil pollution include physical remediation, biological remediation, chemical remediation, and combined remediation. The soil remediation technologies adopted by the "Superfund" project in the United States are mainly in-situ soil gas extraction (SVE) technology...

Claims

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Application Information

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IPC IPC(8): C09K17/04C09K17/40B09C1/08
CPCB09C1/08C09K17/04C09K17/40
Inventor 李林陈文洪翟佳豪曾志高荆晓玲舒长莉王玲
Owner JIANGXI NORMAL UNIV
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