Method for preparing magnetic biochar by one-step method

A biochar and magnetic technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of poor biochar adsorption performance, high cost, and complicated preparation process, and achieve improved Adsorption performance, simple method, simple and efficient separation process

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

AI Technical Summary

Problems solved by technology

The preparation process of this kind of biochar is more complicated, the cost is higher, and the adsorption performance of the obtained biochar is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing magnetic biochar in one step, the operation steps are as follows:

[0026] S1: Straw pretreatment: dry the wheat straw until the water content is 9%, after crushing, sieve the particles with a particle size of 60-30 mesh for later use.

[0027] S2: Iron salt impregnation: Add 0.03 mol / L ferric chloride solution to the wheat straw particles described in step S1, adjust the pH to 10 with 0.100 mol / L sodium hydroxide aqueous solution, and keep warm at 25° C. for 8 hours.

[0028] S3: High-temperature pyrolysis: After the impregnated wheat straw particles described in step S2 are suction-filtered, dried at 80°C until the water content is 9.5%, then transferred to an atmosphere furnace, and heated at 20°C under the protection of a nitrogen flow rate of 50mL / min. / min to 800 ° C, pyrolysis 3h.

[0029] S4: Post-treatment: Suction filter the crude magnetic biochar obtained by pyrolysis described in S3, wash it once with 1:1 deionized water, and wash it ...

Embodiment 2

[0031] A method for preparing magnetic biochar in one step, the operation steps are as follows:

[0032] S1: Straw pretreatment: dry the corn stalks until the water content is 9.5%, and then sieve the corn stalks with a particle size of 60-30 mesh for later use.

[0033] S2: Iron salt impregnation: Add 0.04 mol / L ferric chloride solution to the wheat straw particles described in step S1, adjust the pH to 10 with 0.100 mol / L sodium hydroxide aqueous solution, and keep warm at 25° C. for 8 hours.

[0034] S3: High-temperature pyrolysis: After the impregnated wheat straw particles described in step S2 are suction-filtered, dried at 80°C until the water content is 9.5%, then transferred to an atmosphere furnace, and heated at 20°C under the protection of a nitrogen flow rate of 50mL / min. / min to raise the temperature to 850°C, and pyrolyze for 4 hours.

[0035] S4: Post-treatment: Suction filter the crude magnetic biochar obtained by pyrolysis described in S3, wash it once with 1...

Embodiment 3

[0037] A method for preparing magnetic biochar in one step, the operation steps are as follows:

[0038] S1: Straw pretreatment: dry the wheat straw until the water content is 9.5%, after crushing, sieve the particles with a particle size of 60-30 mesh for later use.

[0039] S2: Iron salt impregnation: Add 0.05 mol / L ferric chloride solution to the wheat straw particles described in step S1, adjust the pH to 10 with 0.100 mol / L sodium hydroxide aqueous solution, and keep warm at 25° C. for 8 hours.

[0040] S3: High-temperature pyrolysis: After the impregnated wheat straw particles described in step S2 are suction-filtered, dried at 80°C until the water content is 9.5%, then transferred to an atmosphere furnace, and heated at 20°C under the protection of a nitrogen flow rate of 50mL / min. / min to raise the temperature to 850°C, and pyrolyze for 4 hours.

[0041] S4: Post-treatment: Suction filter the crude magnetic biochar obtained by pyrolysis described in S3, wash it once w...

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Abstract

The invention discloses a method for preparing magnetic biochar by a one-step method. The method comprises the following steps: S1, straw pretreatment: drying and crushing plant straws, and screeningparticles with the particle size of 60-30 meshes for later use; S2, iron salt dipping: adding an iron salt solution into the straw particles in the step S1 for dipping, adjusting the pH value to 10-11with an alkali solution, and then carrying out heat preservation dipping; S3, high-temperature pyrolysis: performing suction filtration on the impregnated particles in the step S2, drying, and transferring into an atmosphere furnace for high-temperature pyrolysis to obtain a magnetic biochar crude product; and S4, post-treatment: carrying out suction filtration, cleaning and drying on the magnetic biochar crude product obtained by pyrolysis in S3 to obtain a magnetic activated carbon finished product. According to the method for preparing the magnetic biochar through the one-step method, plant straw serves as a raw material, pyrolysis and magnetization can be achieved through one step to prepare the magnetic activated carbon, the method is simple, and large-scale production is easy to achieve.

Description

technical field [0001] The invention belongs to the field of activated carbon preparation, and in particular relates to a method for preparing magnetic biochar in one step. Background technique [0002] With the development of agriculture and the improvement of people's living standards, the phenomenon of waste and direct burning of crop straws has become more and more common. According to relevant research, straw waste incineration has become a significant environmental and social problem in China, and the reason why farmers burn straw is that the opportunity cost of harvesting and utilizing straw is too high, and the income is low; straw power generation, straw gasification centralized gas supply The environmental benefits of new straw resource utilization technologies are obvious, but the economic benefits are affected by factors such as technology, raw materials, and markets, and there are uncertainties; the high cost of straw storage and transportation and the imperfect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28009
Inventor 夏常磊葛省波吴英姬蔡力平左世达罗永宏
Owner NANJING FORESTRY UNIV
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