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Magnetic biochar based on iron-enriched plants, and preparation method and application thereof

A technology for enriching plants and biochar is applied in the fields of biofuels, chemical instruments and methods, alkali metal oxides/hydroxides, etc., to achieve the effects of simple preparation steps, easy industrial production, and environmental friendliness

Active Publication Date: 2020-04-21
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Purpose of the invention: Aiming at the problem that the preparation of magnetic biochar in the prior art requires the addition of additional magnetic agents, the present invention provides a magnetic biochar based on iron-enriched plants. The present invention contains a large amount of iron through iron-enriched plants. During the pyrolysis process, iron-containing substances are directly converted into magnetic substances, carbonization and magnetization occur simultaneously, and magnetic biochar is obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The iron-enriched plant Imperata imperata was collected from the field, washed with deionized water, air-dried at room temperature, dried in an oven at 50°C for 15 hours, crushed and passed through an 80-mesh sieve to obtain the biomass powder of the iron-enriched plant. Put the above-mentioned biomass powder into the high-temperature pyrolysis carbonization device of an electric furnace, and carry out high-temperature pyrolysis carbonization under a nitrogen atmosphere. The pyrolysis temperature is 500°C, the heating rate is 10°C / min, and the pyrolysis time is 3 hours. Wash with deionized water and absolute ethanol, and dry at 60°C to obtain magnetic biochar.

Embodiment 2

[0036] The iron-enriched plant Imperata imperata was collected from the field, washed with deionized water, air-dried at room temperature, dried in an oven at 105°C for 15 hours, crushed and passed through an 80-mesh sieve to obtain the biomass powder of the iron-enriched plant. Put the above-mentioned biomass powder into the high-temperature pyrolysis carbonization device of an electric furnace, and carry out high-temperature pyrolysis carbonization under a nitrogen atmosphere. The pyrolysis temperature is 500°C, the heating rate is 10°C / min, and the pyrolysis time is 3 hours. Wash with deionized water and absolute ethanol, and dry at 50°C to obtain magnetic biochar.

Embodiment 3

[0038] The iron-enriched plant Imperata Imperata was collected from the field, washed with deionized water, air-dried at room temperature, dried in an oven at 80°C for 12 hours, crushed and passed through an 80-mesh sieve to obtain the biomass powder of the iron-enriched plant. Put the above-mentioned biomass powder into the high-temperature pyrolysis carbonization device of an electric furnace, and carry out high-temperature pyrolysis carbonization under a nitrogen atmosphere. The pyrolysis temperature is 500°C, the heating rate is 10°C / min, and the pyrolysis time is 3 hours. Wash with deionized water and absolute ethanol, and dry at 80°C to obtain magnetic biochar.

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Abstract

The invention discloses a magnetic biochar based on iron-enriched plants, and a preparation method and an application thereof. The magnetic biochar based on iron-enriched plants is obtained by directly carrying out high-temperature pyrolysis carbonization or hydrothermal carbonization on the iron-enriched plants. A large amount of iron is accumulated in the iron-enriched plants, and typical iron-enriched plants such as cogongrass are subjected to a high-temperature pyrolysis carbonization or hydrothermal carbonization process to obtain biochar. In the carbonization process, iron enriched in other forms in the plants is converted into magnetic iron oxide, so that the obtained biochar is magnetic biochar, magnetization and carbonization can be synchronously completed without additionally adding a magnetizing agent, no secondary pollution is generated in the preparation process, and the operation is simple. The magnetic biochar can effectively remove heavy metal pollutants in undergroundwater, and has a wide application prospect in the field of underground water heavy metal pollution treatment.

Description

technical field [0001] The invention belongs to the technical field of biochar, and in particular relates to a magnetic biochar based on iron-enriched plants, a preparation method and application thereof. Background technique [0002] As an environmentally friendly material, biochar has been widely used in the fields of waste recycling, soil quality control, and environmental pollution remediation. In recent years, in order to overcome the shortcomings of biochar such as difficult recovery, difficult regeneration, and small adsorption capacity in the actual utilization process, the preparation and application of magnetic biochar (Magnetic biochar) has attracted extensive attention. [0003] The methods for preparing magnetic biochar are usually divided into the following categories: [0004] (1) Impregnating biomass or biochar with a magnetic agent such as iron salt, and then directly pyrolyzing the impregnated biomass or biochar to obtain magnetic biochar. For example, Mu...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F1/48C02F101/20
CPCB01J20/20B01J20/08B01J20/28009C02F1/281C02F1/48C02F2101/20Y02E50/10
Inventor 魏巍许一琳张梦佳杨潇彭祥雯韩睿明李时银王国祥
Owner NANJING NORMAL UNIVERSITY
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