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Ferro-manganese humic acid modified biochar, preparation method thereof and application of biochar

A biochar and humic acid technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve environmental hazards, unsuitable for arsenic-contaminated soil treatment, and unsuitable for cadmium-contaminated soil treatment, etc., to achieve Good practical prospect, simple and easy effect

Inactive Publication Date: 2019-07-26
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Cadmium in soil mainly exists as Cd(II) cation, and arsenic in soil mainly exists as anion AsO 4 3- (As(V)) exists in the form of (As(V)), and the soil environment conditions required to inactivate its mobility and reduce plant effectiveness are just the opposite. The methods and materials used for arsenic-contaminated soil are not suitable for the treatment of cadmium-contaminated soil
Therefore, it is very challenging to prepare a passivator that can remediate both cadmium-contaminated soil and arsenic-contaminated soil.
[0006] Rice husk is one of the products of rice cultivation. Most of the rice straw is burned on the spot, and the smoke from the burning has caused further harm to the local environment.

Method used

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  • Ferro-manganese humic acid modified biochar, preparation method thereof and application of biochar
  • Ferro-manganese humic acid modified biochar, preparation method thereof and application of biochar
  • Ferro-manganese humic acid modified biochar, preparation method thereof and application of biochar

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Experimental program
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Effect test

Embodiment 1

[0038] Rice husk was selected as the biomass raw material, and the rice husk was air-dried and crushed. Each 1g of crushed rice husk was soaked in 10mL of 2% potassium permanganate solution for 24 hours. The pyrolyzed product was passed through a 100-mesh sieve to obtain biochar loaded with manganese oxides, and a concentration of 5 g / L Fe was added dropwise to 1 g of biochar loaded with manganese oxides. 2+ Solution 20mL, after stirring for 15min, add 34mL alkaline sodium humate solution (the alkaline sodium humate preparation method: 1g sodium humate is dissolved in 0.1mol / L sodium hydroxide solution, and then use 0.45 micron Membrane filtration solution), stirring for 1 hour, aging the mixed solution at 70°C for 12 hours, separating the solid from the liquid, drying the solid, and passing through a 100-mesh sieve to obtain the ferromanganese humate modified biochar.

Embodiment 2

[0040] Straw was selected as the biomass raw material, and the straw was air-dried and crushed. Each 1 g of the crushed straw was soaked in 6 mL of 2% potassium permanganate solution for 24 hours. After filtration, it was pyrolyzed at 400 °C for 3 hours without oxygen. The pyrolyzed product was passed through a 100-mesh sieve to obtain biochar loaded with manganese oxides, and a concentration of 5 g / L Fe was added dropwise to 1 g of biochar loaded with manganese oxides. 2+ Solution 15mL, after stirring for 15min, add 30mL alkaline sodium humate solution (the alkaline sodium humate preparation method: 1g sodium humate is dissolved in 0.1mol / L sodium hydroxide solution, and then use 0.45 micron Membrane filtration solution), stirring for 1 hour, aging the mixed solution at 70°C for 10 hours, separating the solid from the liquid, drying the solid, and passing through a 100-mesh sieve to obtain the ferromanganese humate modified biochar.

Embodiment 3

[0042] Animal feces were selected as the biomass raw material, and the animal feces were air-dried and pulverized. Each 1g of pulverized animal feces was soaked in 15mL of 2% potassium permanganate solution for 24 hours. After filtering, it was pyrolyzed at 900°C for 4 hours without oxygen. The pyrolyzed product was passed through a 100-mesh sieve to obtain biochar loaded with manganese oxides, and a concentration of 5 g / L Fe was added dropwise to 1 g of biochar loaded with manganese oxides. 2+ Solution 25mL, after stirring for 15min, add 40mL alkaline sodium humate solution (the alkaline sodium humate preparation method: 1g sodium humate is dissolved in 0.1mol / L sodium hydroxide solution, and then use 0.45 micron Membrane filtration solution), stirring for 1 hour, aging the mixed solution at 70° C. for 14 hours, separating the solid from the liquid, drying the solid, and passing through a 100-mesh sieve to obtain the ferromanganese humic acid modified biochar.

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Abstract

The invention discloses a ferro-manganese humic acid modified biochar, a preparation method thereof and an application of the biochar. Biomasses soaked by potassium permanganate solution are dried andpyrolyzed and then loaded with ferric oxide and humic acid to prepare the ferro-manganese humic acid modified biochar which can be used for removing cadmium and arsenic in polluted water and achieving in-situ remediation of cadmium and arsenic polluted soil.

Description

technical field [0001] The invention belongs to the technical field of preparation of environment-friendly materials, and in particular relates to an iron-manganese humic acid-modified biochar, a preparation method and application thereof. Background technique [0002] Chemical, metal smelting and electroplating industries discharge a large amount of waste water containing heavy metals into the environment during the production process, and incidents of cadmium and arsenic pollution of water bodies often occur. How to effectively treat water bodies containing heavy metals has become one of the important issues in the field of water environment. The heavy metal pollution in soil in my country has affected the quality of cultivated land, food safety and even human health, and the polluted area has been increasing. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", which showed that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28B09C1/08C02F101/20
CPCB01J20/06B01J20/20B01J20/24B09C1/08C02F1/283C02F2101/20
Inventor 颜昌宙郭建华罗专溪陈珍芳
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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