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Acid soil remediation agent, preparation and application thereof

A soil remediation agent and remediation agent technology, applied in application, soil conditioning materials, other chemical processes, etc., can solve problems such as secondary pollution, and achieve the effect of reducing soil cation loss

Active Publication Date: 2020-02-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an acidic soil remediation agent and its preparation and application, which overcomes the defect that the use of strong acid and strong alkali in the prior art is easy to cause secondary pollution. In the present invention, it is based on attapulgite and red mud Materials, chemically modified to prepare functional nanomaterials, which can not only increase soil pH, but also inhibit the loss of basic cations in the soil, and can fundamentally inhibit soil acidification. It has the characteristics of obvious effect and environmental friendliness, and has broad application prospects.

Method used

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  • Acid soil remediation agent, preparation and application thereof
  • Acid soil remediation agent, preparation and application thereof
  • Acid soil remediation agent, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix attapulgite (100 mesh) and red mud (100 mesh) according to the mass ratio of 1:3, and add them to water to obtain a mixed solution with a concentration of 100 g / L;

[0042] (2) Add sodium polyacrylate (5 g / L) to the mixed solution obtained in (1), and stir at room temperature (300 rpm) for 3 hours;

[0043] (3) Add N-hydroxysuccinimide (2 g / L) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to the mixed solution obtained in (2) Salt (1 gram / liter), and pH is adjusted to 8.5 with sodium carbonate and sodium bicarbonate buffer solution, stir at room temperature (300rpm) 8 hours;

[0044] (4) Add polyethyleneimine (molecular weight 1600, 10 g / L) to the solution obtained in (3), stir at room temperature (300 rpm) for 10 hours, filter, wash with 200 mL of water 3 times, and dry at 50 ° C , crushed to 100 mesh to obtain an acidic soil remediation agent;

[0045] (5) Spread the restoration agent evenly on the surface of the soil (pH6) according to 50 ...

Embodiment 2

[0047] (1) Mix attapulgite (150 mesh) and red mud (150 mesh) according to the mass ratio of 2:4, and add it to water to obtain a mixed solution with a concentration of 200 g / L;

[0048] (2) Add sodium polyacrylate (7.5 g / liter) to the mixed solution obtained in (1), and stir at room temperature (400 rpm) for 4 hours;

[0049] (3) Add N-hydroxysuccinimide (3 g / L) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to the mixed solution obtained in (2) Salt (2 grams per liter), and the pH is adjusted to 9 with sodium carbonate and sodium bicarbonate buffer solution, stirred at room temperature (400rpm) for 9 hours;

[0050] (4) Add polyethyleneimine (molecular weight 1700, 15 g / L) to the solution obtained in (3), stir at room temperature (400 rpm) for 11 hours, filter, wash 4 times with 300 mL of water, and dry at 60 ° C , crushed to 150 mesh to obtain an acidic soil remediation agent;

[0051] (5) Spread the repairing agent evenly on the surface of the soil (pH 5)...

Embodiment 3

[0053] (1) Mix attapulgite (200 mesh) and red mud (200 mesh) according to the mass ratio of 3:5, and add it to water to obtain a mixed solution with a concentration of 300 g / L;

[0054] (2) Add sodium polyacrylate (10 g / L) to the mixed solution obtained in (1), and stir at room temperature (500 rpm) for 5 hours;

[0055] (3) Add N-hydroxysuccinimide (4 g / L) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to the mixed solution obtained in (2) Salt (3 grams per liter), and adjust the pH to 9.5 with sodium carbonate and sodium bicarbonate buffer solution, stir at room temperature (500rpm) for 10 hours;

[0056] (4) Add polyethylenimine (molecular weight 1800, 20 g / L) to the solution obtained in (3), stir at room temperature (500 rpm) for 12 hours, filter, wash 5 times with 400 mL of water, and dry at 70 ° C , crushed to 200 mesh to obtain an acidic soil remediation agent;

[0057] (5) Spread the restorative agent evenly on the surface of the soil (pH4) according...

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Abstract

The invention relates to an acid soil remediation agent, preparation and application thereof. Attapulgite and red mud are used as base materials to prepare a functionalized nano material through chemical modification. The obtained soil remediation agent can improve the pH of soil, also can inhibit loss of salt-based cations in the soil, and can fundamentally inhibit soil acidification, has the characteristics of obvious effect, environmental friendliness and the like, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of soil remediation agent and its preparation and application, in particular to an acidic soil remediation agent and its preparation and application. Background technique [0002] There are more than 200 million mu of acidic soil in my country, and the degree of soil acidification is intensifying. Acidified soils are mainly distributed in the south of my country. The root cause of soil acidification is that the base dissolves and the soil becomes aluminous soil. Rainy conditions in the south can easily lead to basic cations in the soil (free Ca 2+ , Mg 2+ 、K + 、Na + ) leaching loss, so the adsorption sites on the surface of the soil colloid are easily absorbed by the external input and the H secreted by the plant root system + occupied, these H + Al in the soil 3+ released and hydrolyzed to produce H + , exacerbating soil acidification. Soil acidification will lead to the loss of trace elements in the soil, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00C09K101/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 蔡冬清王冬芳吴正岩宋新山
Owner DONGHUA UNIV
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