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Preparation method and application of biochar for reducing enrichment effect of vegetables on Pb (II) in soil

A biochar and soil technology, applied in the preparation/purification of carbon, restoration of polluted soil, chemical instruments and methods, etc., can solve the problems of easy migration of exchangeable lead, ecological environment hazards, and difficulty in migration, etc. The effect of enrichment, pollution reduction, and cheap raw materials

Inactive Publication Date: 2020-04-10
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead exists in different forms in polluted soil, and each form has different impacts on the ecological environment. Lead in the form of residues in the soil can exist stably, is not easy to migrate, and has the least harm to the ecological environment. Exchangeable lead is easy to migrate, and its biological toxicity is the most harmful to the ecological environment. Therefore, the treatment suitable for Pb(II) in water is not suitable for the soil treatment of crops and vegetables.

Method used

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  • Preparation method and application of biochar for reducing enrichment effect of vegetables on Pb (II) in soil
  • Preparation method and application of biochar for reducing enrichment effect of vegetables on Pb (II) in soil
  • Preparation method and application of biochar for reducing enrichment effect of vegetables on Pb (II) in soil

Examples

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Effect test

Embodiment 1

[0021] (1) Wash and dry the corn stalks, cut them into 8cm-12cm straw sections, soak the corn stalk sections with 10% potassium hydroxide solution for 24 hours, and dry them at 60°C to constant weight;

[0022] (2) Put the soaked straw section in step (1) into a tube-type atmosphere furnace, fill the tube-type furnace with nitrogen gas, and use a program to raise the temperature at a constant rate of 10 °C / min. At 700 °C, there is no Oxygen carbonization for 180min, cooling to room temperature in the furnace;

[0023] (3) The biochar obtained in step (2) was ground, passed through a 100-mesh sieve, washed with deionized water until neutral, dried, and then passed through a 100-mesh sieve to obtain modified corn stalk biochar, marked as KBC700.

Embodiment 2

[0043] (1) Wash and dry the corn stalks, cut them into 8cm-12cm straw sections, soak the corn stalk sections with 10% potassium hydroxide solution for 24 hours, and dry them at 60°C to constant weight;

[0044] (2) Put the soaked straw section in step (1) into a tube-type atmosphere furnace, fill the tube-type furnace with nitrogen gas, and use a program to raise the temperature at a constant rate of 10 °C / min. At 600 °C, there is no Oxygen carbonization for 180min, cooling to room temperature in the furnace;

[0045] (3) The biochar obtained in step (2) was ground, passed through a 100-mesh sieve, washed with deionized water until neutral, dried, and then passed through a 100-mesh sieve to obtain the modified corn stalk biochar, marked as KBC600.

Embodiment 3

[0047] (1) Wash and dry the corn stalks, cut them into 8cm-12cm straw sections, soak the corn stalk sections with 10% potassium hydroxide solution for 24 hours, and dry them at 60°C to constant weight;

[0048] (2) Put the soaked straw section in step (1) into a tube-type atmosphere furnace, fill the tube-type furnace with nitrogen gas, and use a program to raise the temperature at a constant speed of 10 °C / min. At 500 °C, there is no Oxygen carbonization for 180min, cooling to room temperature in the furnace;

[0049] (3) The biochar obtained in step (2) was ground, passed through a 100-mesh sieve, washed with deionized water until neutral, dried, and then passed through a 100-mesh sieve to obtain modified corn stalk biochar, marked as KBC500.

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Abstract

The invention discloses a preparation method and application of biochar for reducing enrichment effect of vegetables on Pb (II) in soil. The preparation method comprises the following steps: cleaningcorn straw, drying, cutting into sections, soaking in a potassium hydroxide solution, carrying out anaerobic carbonization at 500-700 DEG C for 180 minutes, grinding, sieving with a 100-mesh sieve, washing with deionized water to neutrality, drying and sieving with a 100-mesh sieve, thereby obtaining the modified biochar. When the modified biochar is applied to Pb (II) contaminated soil, exchangeable lead in the soil can be remarkably reduced and residual lead is increased so that the mobility and the bioavailability of Pb (II) are reduced. The corn straw is effectively utilized, the raw materials are sufficient and easy to obtain, the modification process is simple and the operability is high; the biochar can be widely applied to micro-polluted soil, the enrichment effect of the vegetables on Pb (II) is reduced, the food safety is improved and the biochar has multiple environmental protection significance.

Description

technical field [0001] The invention relates to a preparation method and application of biochar for reducing the enrichment effect of vegetables on Pb(II) in soil. Background technique [0002] Lead is the most documented toxic substance among all known toxic substances. Lead can damage the nervous system, causing peripheral neuritis, motor and sensory disturbances. In addition, lead flows into the brain tissue with the blood, damages the cerebellum and cerebral cortex cells, interferes with metabolic activities, causes insufficient supply of nutrients and oxygen, causes swelling of small capillary endothelial cells in the brain, and then develops into diffuse brain damage. People who are often exposed to low concentrations of lead will experience headaches, dizziness, fatigue, memory loss and insomnia when the blood lead reaches 60-80 micrograms per 100 milliliters, often accompanied by digestive system symptoms such as loss of appetite, constipation and abdominal pain. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C01B32/05B09C1/00
CPCB01J20/20C01B32/05B09C1/00
Inventor 刘淼温泉原帅
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE