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A modification method of biochar and its application in soil remediation

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

Inactive Publication Date: 2020-11-24
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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  • A modification method of biochar and its application 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 with oxygen-limited pyrolysis to form biochar and pulverize it, and fill the muffle furnace with Nitrogen protection;

[0020] 2) prepare the aqueous solution of maleic acid, polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of described maleic acid, 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 biochar is 6 times of the mass of biochar, filter after soaking for 5 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 aqueo...

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 in a muffle furnace at 600°C for 1 hour with oxygen-limited pyrolysis to form biochar and pulverize it, and fill the muffle furnace with Nitrogen protection;

[0027] 2) prepare the aqueous solution of maleic acid, polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of described maleic acid, 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 aqueous s...

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 in a muffle furnace at 600°C for 1 hour with oxygen-limited pyrolysis to form biochar and pulverize it, and fill the muffle furnace with Nitrogen protection;

[0034] 2) prepare the aqueous solution of maleic acid, polyethylene glycol, the content of maleic acid and polyethylene glycol in the aqueous solution of described maleic acid, 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 percent content is 10% hydrogen peroxide, the quality of hydrogen peroxide used for soaking biochar is 6 times of the mass of biochar, soaked for 8 minutes, filtered, and the solid phase is soaked in the aqueous solution of maleic acid and polyethylene glycol, maleic acid The quality of acid and polyethylene glycol aqueous solutio...

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Abstract

The invention discloses a method for modifying biochar, comprising: 1) pyrolyzing wheat straw and fresh whole cattail plants into biochar with limited oxygen and pulverizing them; 2) first soaking the prepared biochar in hydrogen peroxide, and then Soak in an aqueous solution of maleic acid and polyethylene glycol, cool and filter to obtain solid phase A; 3) disperse solid phase A in ethanol to form a suspension, add 2, 2, 6, 6-tetramethylpiperidine-nitrogen-oxide, methacrylic acid to obtain solid phase B; 4) solid phase B is soaked in an aqueous solution of acetic acid, and potassium periodate is added to the solution to obtain solid phase C; 5) The solid phase C was soaked in the mixture of dimethylformamide and N-methylpyrrolidone to obtain the modified biochar. The invention optimizes the modification process of biochar, adopts wheat straw and cattail as composite biochar, and optimizes the modification on the basis of the composite biochar, so that the Cd repair effect of biochar is very significant, and after being applied to cadmium-contaminated soil , significantly reducing the toxicity of heavy metals in the 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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Patent Type & Authority Patents(China)
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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