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Preparation method of magnetic biochar material

A biochar, magnetic technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of unsatisfactory heavy metal ion adsorption and secondary pollution, etc.

Pending Publication Date: 2021-07-30
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on the relatively small specific surface area, pore volume, and pore size of the original biochar, the adsorption effect of biochar on heavy metal ions in the soil is not ideal, and there are technical problems that it is difficult to separate and recover and easily cause secondary pollution.

Method used

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  • Preparation method of magnetic biochar material

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preparation example Construction

[0023] As one of the embodiments of the present invention, a method for preparing a magnetic biochar material comprises the following steps: using crop straw as a raw material, after pretreatment, sequentially impregnating with iron salt, freeze-drying, high-temperature pyrolysis, and post-treatment to obtain the Magnetic biochar materials.

[0024] Preferably, the pretreatment of the crop straws specifically includes: the crop straws are washed and preliminarily crushed, then heated and soaked in an alkaline solution, washed and dried, crushed and sieved.

[0025] Preferably, the crop stalks are washed and preliminarily crushed to a length less than 5 cm, then placed in a sodium carbonate solution with a mass fraction of 5-10% at 50-80° C. for 10-60 minutes, heated and soaked for 10-60 minutes, and then taken out to dry.

[0026] Before iron salt impregnation, the use of alkaline solution to heat and impregnate the crop straw has the following effects: on the one hand, it can...

Embodiment 1

[0037] (1) Raw material pretreatment: take corn stalks as raw materials, wash and dry them, and then crush them to a length of less than 5 cm, then place them in a sodium carbonate solution with a mass fraction of 5%, heat them to 80°C, soak them at a constant temperature for 30 minutes, and take them out to dry Dry;

[0038] (2) Ferric salt impregnation: take ferric chloride and ferrous chloride, be dissolved in water according to the ratio of 1:2 according to molar ratio and prepare the ferric salt mixed solution that the total concentration of iron ions is 1.5mol / L, will pass through step ( 1) The pretreated crop stalks are soaked in the iron salt mixed solution for 24 hours, then taken out and aired until the water content is 20%;

[0039] (3) Freeze-drying: vacuum freeze-dry the crop stalks impregnated in step (2), grind and pulverize them, the freeze-drying temperature is -20°C, the vacuum degree is 5 Pa, and the freeze-drying time is 20 minutes;

[0040] (4) Place the cr...

Embodiment 2

[0042] With embodiment 1, difference is, omit the mass fraction in the step (1) and be the sodium carbonate solution heating soaking step of 5%.

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Abstract

The invention provides a preparation method of a magnetic biochar material, and relates to the technical field of biochar preparation, and the magnetic biochar material is obtained by pretreating crop straw as a raw material and then sequentially carrying out ferric salt impregnation, freeze drying, high-temperature pyrolysis and post-treatment. The magnetic biochar material is prepared by performing freeze-drying treatment on crops impregnated with ferric salt and then performing high-temperature pyrolysis, and due to the fact that ferric salt solution is adsorbed in the crop raw materials, in the freeze-drying process, a large number of pore structures are generated in the crops in the sublimation process of moisture components in the crop raw materials; therefore, the pore structure of the raw material is further increased while the adsorption capacity of the ferric salt is ensured, the prepared biochar material has larger specific surface area and adsorption capacity, and the technical problem that the specific surface area of biochar is reduced due to loading of the ferric salt is avoided. Therefore, the biochar material can be separated and recycled after adsorbing pollutants such as heavy metals, and the problem of secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a preparation method of a magnetic biochar material. Background technique [0002] Soil heavy metal pollution has brought prominent ecological environment and food safety problems, and has attracted widespread attention. Heavy metals accumulate in the soil, causing soil degradation and lower crop yield and quality. Heavy metals cannot be biodegraded, they will accumulate in plants, and be enriched in human and animal bodies through the food chain, posing a threat to human and animal health. Therefore, how to effectively remove heavy metals in soil is a technical problem that needs to be solved in today's society. [0003] Biochar is a kind of porous carbon formed by pyrolysis of biomass raw materials, such as livestock and poultry manure, animal bones, waste wood chips, sludge and crop straw, etc. under low or anaerobic conditions. It has the characteristics of high...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/32
CPCB01J20/20B01J20/28009B01J20/3071B01J20/3021B01J20/3078B01J20/3236B01J2220/4825
Inventor 兰宇曹殿云杨萍孟军陈温福韩晓日
Owner SHENYANG AGRI UNIV
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