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Magnetic biochar as well as preparation method and application thereof in adsorption of heavy metals in soil

A biochar and heavy metal technology, which is applied in the directions of alkali metal compounds, chemical instruments and methods, and the restoration of polluted soil, can solve the problems of soil heavy metal Cd-As composite pollution, etc., and achieves improved stabilization efficiency, low price, and preparation simple method effect

Pending Publication Date: 2022-03-22
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a kind of magnetic biochar and its preparation method and its application in the adsorption of soil heavy metals, so as to solve the problem of soil heavy metal Cd-As compound pollution

Method used

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  • Magnetic biochar as well as preparation method and application thereof in adsorption of heavy metals in soil
  • Magnetic biochar as well as preparation method and application thereof in adsorption of heavy metals in soil
  • Magnetic biochar as well as preparation method and application thereof in adsorption of heavy metals in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of magnetic biochar, comprising the following steps:

[0032] Step 1: After washing the corn stalks, dry them at 65° C. until the quality is constant, remove the outer crust, crush them and pass them through a 1 mm sieve to obtain corn stalk powder.

[0033] Step 2: Take 100g of processed corn stalk powder and immerse it in 2L of anaerobic water (boil ultrapure water for 10min) containing 0.1mol / L Fe 2+ and 0.2mol / L Fe 3+ in the mixed solution. Adjust the pH to 12 by adding 5 mol / L NaOH solution, and stir continuously for 30 min during the adjustment process to make it evenly mixed. Seal the mouth of the container with plastic wrap, put it in a water bath at 60°C for 2 hours, and then let it stand at room temperature for 24 hours. Washed with water, filtered, and dried at 65°C for later use.

[0034] Step 3: Fill the crucible with the corn stalk powder treated in Step 2, and after compacting, flush it with nitrogen gas and anaerobic gas, pyrolyz...

Embodiment 2

[0038] The MBC prepared in Example 1 was used to carry out stabilization and remediation experiments on the heavy metal-contaminated soil in Huludao. The intermediate pollution characteristics of the heavy metal-contaminated soil in Huludao are shown in Table 1 below.

[0039] Table 1 Intermediate pollution characteristics of heavy metal polluted soil in Huludao

[0040] Heavy metal element content mg / kg Cd As Total 29.77 39.93 Effective content 19.98 7.58

[0041] Take 200g of in-situ heavy metal polluted dry soil samples in Huludao, add MBC with mass percentages of 0%, 1%, 3%, and 5% in turn, mix well, add 60ml of deionized water to make the moisture content of the soil samples reach 30%. Use the weighing method to supplement the lost water to maintain the water content, and put it into a constant temperature incubator at 25°C for 30 days. After 30 days, soil samples were taken, dried in the shade, and ground to analyze the concentration of t...

Embodiment 3

[0045] Using the MBC prepared in Example 1, the stabilization and remediation experiments were carried out on Huludao heavy metal-contaminated soil with different water contents.

[0046] Take 50g of in situ heavy metal polluted dry soil samples in Huludao, add MBC in an amount of 5% by mass, set 15%, 70% moisture content, soil pH conditions are shown in Table 2.

[0047] Table 2

[0048] Soil moisture content 15％ 70％ Soil pH 8.17 8.19

[0049] Add 7.5ml and 35ml deionized water to the two treatments, mix well, and use the weighing method to supplement the lost water every day. Placed in a constant temperature incubator at 25°C for 30 days. After 30 days, soil samples were taken, dried in the shade, and ground to analyze the concentration of the effective state of heavy metals. The stabilization effect of heavy metal cadmium arsenic is as follows: Figure 4-5 shown.

[0050] Depend on Figure 4-5 It can be seen that under the conditions of 15% and ...

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Abstract

The invention relates to the technical field of biochar preparation, in particular to magnetic biochar as well as a preparation method and application thereof to adsorption of heavy metals in soil. The preparation method comprises the following steps: washing corn straws, drying, removing peels, grinding and sieving to obtain corn straw powder for later use; soaking the treated corn straw powder in an aqueous solution containing Fe2 and Fe3 +, adjusting the pH to be alkaline for 30 minutes continuously, sealing the opening of a container for reaction, standing at room temperature, washing with water, filtering and drying for later use; and filling the treated biomass material into a crucible, compacting, filling nitrogen for anaerobic treatment, pyrolyzing, cooling, grinding and sieving to obtain the magnetic biochar. The magnetic biochar can realize synchronous stabilization of heavy metal Cd-As in soil, the effective state contents of the two elements in the soil are obviously reduced, and the stabilization efficiency is obviously improved.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a magnetic biochar, a preparation method thereof and an application in adsorbing heavy metals in soil. Background technique [0002] With the development of modern industry, expansion of industrial areas, mining and smelting of metal mines, and spraying of chemical fertilizers and pesticides, the problem of heavy metal pollution in soil has become increasingly serious, seriously threatening national food security, living environment safety, and human health. Among them, the heavy metals cadmium (Cd) and arsenic (As) are two kinds of elements with strong toxicity and easy to be absorbed and enriched by crops. Due to the difference in chemical properties and occurrence forms of Cd and As in the soil, the treatment process In China, it is often difficult to achieve joint restoration. [0003] At present, soil heavy metal remediation methods can be divided into chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B09C1/00
CPCB01J20/06B01J20/20B01J20/28009B09C1/00
Inventor 侯伟王一李晓军王松
Owner LIAONING UNIVERSITY
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