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Magnetic carbon composite material for remedying heavy metal contaminated soil and preparation method thereof

A composite material and soil-contaminated technology, applied in the field of magnetic carbon composite materials and preparation, can solve the problems of poor acid resistance and complicated preparation process, and achieve the effects of strong acid resistance, soil improvement and fertility increase

Inactive Publication Date: 2021-03-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method for preparing a magnetic carbon composite material for remediating heavy metal-contaminated soil, which is used to solve the problems of complex preparation process and poor acid resistance of magnetic materials in soil remediation applications , at the same time, the present invention will also provide a magnetic carbon composite material for repairing heavy metal polluted soil

Method used

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  • Magnetic carbon composite material for remedying heavy metal contaminated soil and preparation method thereof
  • Magnetic carbon composite material for remedying heavy metal contaminated soil and preparation method thereof

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Effect test

Embodiment 1

[0038] A method for preparing a magnetic carbon composite material for repairing heavy metal-contaminated soil, comprising the steps of:

[0039] S1. Preparation of modified raw materials:

[0040] S11. Preparation of magnetically modified biochar material: FeCl 2 • 4H 2 O and FeCl 3 •6H 2 Under the protection of nitrogen, O is mixed according to the molar ratio of 1:1 to form an iron salt mixture, and then add biochar and water to mix evenly, so that the biochar can absorb ferrous and ferric salts, and naturally filter out the liquid to obtain Adsorb the biochar of ferrous iron salt and ferric salt, then add dropwise ammonia water with a mass concentration of 25%, the reaction temperature is 60°C, and the reaction time is 2h; after washing with water, a magnetically modified biochar material is obtained;

[0041] S12. Preparation of β-cyclodextrin modified starch: add β-cyclodextrin and tapioca starch into water to make a suspension, heat up and stir to gelatinize (gelati...

Embodiment 2

[0047] A method for preparing a magnetic carbon composite material for repairing heavy metal-contaminated soil, comprising the steps of:

[0048] S1. Preparation of modified raw materials:

[0049] S11. Preparation of magnetically modified biochar material: FeCl 2 • 4H 2 O and FeCl 3 •6H 2 Under the protection of nitrogen, O is mixed according to the molar ratio of 1:1 to form an iron salt mixture, and then add biochar and water to mix evenly, so that the biochar can absorb ferrous and ferric salts, and naturally filter out the liquid to obtain Adsorb the biochar of ferrous iron salt and ferric salt, then add dropwise ammonia water with a mass concentration of 25%, the reaction temperature is 70°C, and the reaction time is 3h; after washing with water, a magnetically modified biochar material is obtained;

[0050] S12. Preparation of β-cyclodextrin modified starch: add β-cyclodextrin and tapioca starch into water to make a suspension, heat up and stir for gelatinization (g...

Embodiment 3

[0056] A method for preparing a magnetic carbon composite material for repairing heavy metal-contaminated soil, comprising the steps of:

[0057] S1. Preparation of modified raw materials:

[0058] S11. Preparation of magnetically modified biochar material: FeCl 2 • 4H 2 O and FeCl 3 •6H 2 Under the protection of nitrogen, O is mixed according to the molar ratio of 1.1:1 to form a mixture of iron salts, and then add biochar and water to mix evenly, so that the biochar can absorb ferrous salts and ferric salts, and naturally filter out the liquid. Obtain biochar that adsorbs ferrous salts and ferric salts, then add ammonia water with a mass concentration of 25% dropwise, the reaction temperature is 60°C, and the reaction time is 2h; after washing with water, a magnetically modified biochar material is obtained;

[0059] S12. Preparation of β-cyclodextrin modified starch: add β-cyclodextrin and tapioca starch into water to make a suspension, heat up and stir to gelatinize (g...

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Abstract

The invention relates to the technical field of soil remediation materials, and discloses a magnetic carbon composite material for remedying heavy metal contaminated soils and a preparation method thereof. The preparation method includes the steps that bivalent ferric salt and trivalent ferric salt are mixed, then biomass charcoal and water are added and mixed evenly, the bivalent ferric salt andthe trivalent ferric salt are adsorbed by the biomass charcoal, and liquid is filtered out naturally; the biochar that adsorbs bivalent ferric salt and trivalent ferric salt is obtained, then ammoniawater is added, a reaction is carried out to generate ferroferric oxide, and washing with water is carried out to obtain a magnetic modified biochar material; and the magnetic modified biochar material and beta cyclodextrin modified starch are uniformly stirred and mixed, and granulating is carried out to form the magnetic soil remediation material. The problems that an existing magnetic materialis complex in preparation process and poor in acid resistance in soil remediation application are solved. The beta cyclodextrin modified starch is compounded with the magnetic modified biochar material, so that the adsorption capacity of heavy metal ions in soil can be improved, the remediation efficiency of the soil is improved, and meanwhile, the magnetic soil remediation material has relativelygood acid resistance, so that the magnetic soil remediation material can be recycled after heavy metals are removed by dilute acid washing after being recycled.

Description

technical field [0001] The invention relates to the technical field of soil repair materials, in particular to a magnetic carbon composite material for repairing heavy metal polluted soil and a preparation method thereof. Background technique [0002] Soil is an important material basis for human social production activities and an indispensable natural resource that is difficult to regenerate. There are many reasons for soil pollution, such as industrial sludge, agricultural garbage, sewage irrigation, pollutant deposition in the atmosphere, heavy use of mineral fertilizers and pesticides containing heavy metals, and so on. [0003] Polluted soil will lead to crop yield reduction, and may even cause excessive pollutants in agricultural products, which will endanger human health. In addition, with the acceleration of economic development and urbanization, the site pollution caused by industrial and mining enterprises is also very serious. Due to changes and adjustments in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C09K17/40B09C1/00
CPCB01J20/06B01J20/20B01J20/24B01J20/28009B09C1/00C09K17/40
Inventor 陈庆陈巧和司文彬白涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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