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Preparation method of soil heavy-metal stabilizer

A heavy metal stabilizer and soil technology, which is applied in the restoration of polluted soil, chemical instruments and methods, and other chemical processes, can solve the problems of difficult adsorption of heavy metals, strong hydrophobicity, etc., achieve carbon sequestration, short repair time, Eases the effect of absorption

Active Publication Date: 2015-04-29
银发环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the surface of biochar has obvious porous characteristics, large specific surface area and high surface energy, it is difficult to adsorb heavy metals on most surfaces due to the lack of polar functional groups on the surface of biochar and strong hydrophobicity.

Method used

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  • Preparation method of soil heavy-metal stabilizer
  • Preparation method of soil heavy-metal stabilizer
  • Preparation method of soil heavy-metal stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. Preparation of activated biochar:

[0032] Take corncobs and place them in an oven to dry at 60°C, crush them to 200 mesh, impregnate them with 0.5mol / L NaOH solution for 18 hours, and then 3 N / min 2 Under protection, burn at 500°C for 4 hours, cool to room temperature, wash with distilled water, and dry to obtain activated biochar;

[0033] b. Preparation of activated organic composite biochar:

[0034] The sodium dithiocarbamate derivative solution with a concentration of 10mmol / L was mixed with activated biochar at a weight ratio of 1:100, and balanced and oscillated at a speed of 60r / min for 6 days under dark conditions, and then Centrifuge at 2000r / min for 15min, remove the supernatant, collect the precipitated mixture, and dry to obtain a soil metal stabilizer.

[0035] In order to verify the technical effect of the present invention, polluted soil around a smelter was taken as a sample, crushed and screened. The following tests were specially made, and the...

Embodiment 2

[0041] a. Preparation of activated biochar:

[0042] Take the straw and place it in an oven to dry at 50°C, crush it to 200 mesh, impregnate it with a 0.1mol / L KOH solution for 24 hours, and 3 N / min 2 Under protection, burn at 200°C for 4 hours, cool to room temperature, wash with distilled water, and dry to obtain activated biochar;

[0043] b. Preparation of activated organic composite biochar:

[0044] The sodium pyrrolidine dithiocarbamate solution with a concentration of 1mmol / L was mixed with activated biochar at a weight ratio of 1:120, and balanced and oscillated at a speed of 60r / min for 5 days under dark conditions, and then Centrifuge at 2000r / min for 15min, remove the supernatant, collect the precipitated mixture, and dry to obtain a soil metal stabilizer.

[0045] In order to verify the technical effect of the present invention, polluted soil around a smelter was taken as a sample, crushed and screened. The following tests were specially made, and the test res...

Embodiment 3

[0051] a. Preparation of activated biochar:

[0052] Take rice husk and banana stem and mix them evenly at a weight ratio of 2:1, place them in an oven and dry them at 40°C, crush them to 200 mesh, and use a concentration of 1mol / L Mg(OH) 2 The solution was soaked for 3 hours, and then the air velocity was 150cm 3 N / min 2 Under protection, burn at 700°C for 4 hours, cool to room temperature, wash with distilled water, and dry to obtain activated biochar;

[0053] b. Preparation of activated organic composite biochar:

[0054] Mix the sodium bibenzyl dithiocarbamate solution with a concentration of 20mmol / L and the activated biochar at a weight ratio of 1:80, balance and shake at a speed of 60r / min for 7 days under dark conditions, and then Centrifuge at 2000r / min for 15min, remove the supernatant, collect the precipitated mixture, and dry to obtain a soil metal stabilizer.

[0055] In order to verify the technical effect of the present invention, polluted soil around a sme...

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Abstract

The invention relates to a preparation method of a soil heavy-metal stabilizer, and belongs to the technical field of soil remediation and treatment. The preparation method comprises the following steps of a, preparing active charcoal, namely, drying organic matter, crushing, immersing by an alkali salt solution, and then firing under the protection of N2 so as to obtain the active charcoal; and b, preparing active organic composite charcoal, namely, mixing a sodium dithiocarbamate derivative solution with the active charcoal, carrying out balance vibration under a dark condition, then centrifuging, collecting a precipitate mixture, and drying so as to obtain the soil heavy-metal stabilizer. The preparation method of the soil heavy-metal stabilizer has the advantages that adsorption and fixing effects for heavy metal in soil are obvious; the absorption of heavy metal in soil cy plants or crops can be relieved effectively; the hazard of taking in heavy metal from crops by human beings is reduced.

Description

technical field [0001] The invention belongs to the technical field of soil restoration and management, and in particular relates to a preparation method of a soil heavy metal stabilizer. Background technique [0002] In recent years, heavy metal pollution incidents have occurred frequently, and the problem of heavy metal soil pollution has become increasingly serious. According to the "2014 National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources, the total soil exceeding the standard rate in the country reached 16.1%, and the point exceeding standard rate of cultivated land soil reached 19.4%. The area of ​​soil pollution is increasing year by year and has not been effectively controlled. Heavy metal soil pollution has become one of the most important environmental problems in my country, and the situation is particularly severe. [0003] For the remediation and treatment of heavy metal soil, st...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00
CPCB01J20/20B01J20/3085B01J2220/42B09C1/00
Inventor 吴文卫吴迪周丹丹魏东尚正蓉
Owner 银发环保股份有限公司
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