Modified biochar, preparation method and application thereof

A technology of biochar modification, which is applied in the field of environmental soil treatment, can solve problems such as difficult to achieve effects, and achieve the effects of enhancing synchronous solidification and stabilization, enhancing adsorption capacity, and enriching surface functional groups

Inactive Publication Date: 2021-01-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the soil environment, it is difficult to achieve good results by remediating complex pollution with the original physical, chemical, plant and microbial methods. Therefore, how to reasonably combine various remediation technologies is the real Breakthroughs have been made in soil pollution remediation, which has become a research hotspot at this stage

Method used

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  • Modified biochar, preparation method and application thereof
  • Modified biochar, preparation method and application thereof
  • Modified biochar, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of modified biochar:

[0035] S1. After drying the peanut shells, break them into solid particles below 1mm, then mix the peanut shell powder with deionized water and filter to obtain the impregnated peanut shell powder, let it stand for soaking for 24 hours, and then filter it with a funnel for 30 minutes. The product was dried in an electric blast drying oven at 110°C for 2 hours;

[0036] S2. 5g peanut shell powder after the deionized water immersion obtained is mixed with 100mL potassium permanganate solution (0.1mol / L) and 100mL ferric chloride solution (0.05mol / L) to obtain a mixture, and the mixture is heated at 550° C. Carry out carbonization. The carbonization time is 16 hours. After carbonization, the pyrolysis product peanut shell biochar is obtained. The pyrolysis product is cooled to room temperature (25° C.) and then dried. The drying time is 18 hours and the drying temperature is 110° C.;

[0037] S3. Take 3 g of the above-mentioned peanu...

Embodiment 2

[0043] (1) Preparation of modified biochar:

[0044] S1. After drying the peanut shells, break them into solid particles below 1mm, then mix the peanut shell powder with deionized water and filter to obtain the impregnated peanut shell powder, let it stand for soaking for 24 hours, and then filter it with a funnel for 30 minutes. The product was dried in an electric blast drying oven at 110°C for 2 hours;

[0045] S2. 5g peanut shell powder after the deionized water immersion obtained is mixed with 100mL potassium permanganate solution (0.15mol / L) and 100mL ferric chloride solution (0.10mol / L) to obtain a mixture, and the mixture is heated at 650°C Carry out carbonization. The carbonization time is 18 hours. After carbonization, the pyrolysis product peanut shell biochar is obtained. The pyrolysis product is cooled to room temperature (25° C.) and then dried. The drying time is 18 hours and the drying temperature is 110° C.;

[0046] S3. Get the above-mentioned peanut shell b...

Embodiment 3

[0052] (1) Preparation of modified biochar:

[0053] S1. After drying the peanut shells, break them into solid particles below 1mm, then mix the peanut shell powder with deionized water and filter to obtain the impregnated peanut shell powder, let it stand for soaking for 24 hours, and then filter it with a funnel for 30 minutes. The product was dried in an electric blast drying oven at 110°C for 2 hours;

[0054] S2. 5g peanut shell powder after the deionized water immersion obtained is mixed with 100mL potassium permanganate solution (0.2mol / L) and 100mL ferric chloride solution (0.10mol / L) to obtain a mixture, and the mixture is heated at 700°C Carry out carbonization, the carbonization time is 20h, after carbonization, the pyrolysis product peanut shell biochar is obtained, and the pyrolysis product is cooled to room temperature (25°C) and then dried, the drying time is 18h, and the drying temperature is 120°C;

[0055] S3. Get the above-mentioned peanut shell biochar 6g ...

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Abstract

The invention provides modified biochar, a preparation method and application thereof. According to the modified biochar, biomass is used as a raw material, and is subjected to carbonization pyrolysisthrough mixing modification with potassium permanganate and ferric chloride to prepare iron-manganese oxide loaded biochar, and the biochar is modified with chitosan to obtain the modified biochar, wherein the raw material is one of straw, rice straw, rice husk, peanut shell, corncob, camellia oleifera shell and cottonseed hull. According to the invention, the prepared modified biochar is large in specific surface area, developed in pore and multiple in surface oxygen-containing functional groups; the modified biochar is applied to treatment of heavy metal organic matter contaminated soil, onthe basis of promoting adsorption of heavy metal and organic matter in the contaminated soil, a good solidification and stabilization effect can be achieved on the heavy metal organic matter; and themodified biochar material can stably exist in the soil for a long time, and has long-term restoration.

Description

technical field [0001] The invention belongs to the field of environmental soil treatment, in particular to a modified biochar and its preparation method and application. Background technique [0002] Pollutants in the current soil environment are tending to be diversified and complex, and the types of pollutants entering the ecosystem are increasing exponentially with time. compound pollutants. In the field of combined soil pollution research, the problem of heavy metal-organic combined pollution is particularly prominent, and has gradually become the focus of current research. [0003] At present, the main remediation methods for heavy metal-organic compound polluted soil include: (1) Physical and chemical remediation: use physical and chemical methods such as incineration, landfill or solvent elution, thermal desorption, adsorption and concentration to remove pollutants from the soil remove. (2) Phytoremediation: Using plants to accumulate or remove pollutants. (3) Mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B09C1/00
CPCB01J20/06B01J20/20B01J20/22B01J20/24B01J2220/4806B01J2220/4812B01J2220/4825B09C1/00
Inventor 李海波李赓李英华王丽欣张宸溪许佳宁邓宁灿张文馨
Owner NORTHEASTERN UNIV
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