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Preparation method of soil stabilizing agent

A stabilizer and soil technology, applied in the field of soil stabilizer preparation, can solve the problems of unfavorable crop root growth, strong soil reduction effect, accumulation of organic and inorganic reducing substances, etc., so as to adjust soil redox potential and reduce heavy metals The effect of content

Active Publication Date: 2018-12-14
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The soil reduction effect is strong, and it is easy to cause a large amount of organic and inorganic reducing substances to accumulate, which is not conducive to the growth of crop roots, seriously affects root respiration, and causes crop production reduction or death

Method used

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  • Preparation method of soil stabilizing agent
  • Preparation method of soil stabilizing agent

Examples

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Effect test

Embodiment 1

[0024] A method for preparing a soil stabilizer, the operation steps are as follows:

[0025] (1) Dissolve 16 g of sodium carboxymethyl cellulose with a degree of substitution of 0.4 in 400 ml of an aqueous solution to obtain an aqueous solution of sodium carboxymethyl cellulose with a concentration of 40 g / L, and adjust the pH value of the sodium carboxymethyl cellulose aqueous solution with hydrochloric acid Is 5.5;

[0026] (2) Dissolve EDC and NHS in the aqueous solution of sodium carboxymethyl cellulose obtained after adjusting the pH in step (1), and then add the dithiobifunctional crosslinking agent 3,3'-dithiodipropionic acid After stirring and dissolving, let stand for 12h to form a hydrogel. Take out the hydrogel and freeze-dry to a constant vacuum to obtain a soil stabilizer; among them, the amount of EDC and NHS added and the carboxyl content in the sodium carboxymethyl cellulose aqueous solution The molar ratio is 0.5:0.5:2; the molar ratio of the amount of the added ...

Embodiment 2

[0029] A method for preparing a soil stabilizer, the operation steps are as follows:

[0030] (1) Dissolve 12g of sodium carboxymethylcellulose with a degree of substitution of 0.45 in 400ml of aqueous solution to obtain an aqueous solution of sodium carboxymethylcellulose with a concentration of 30g / L, which is adjusted by morpholine ethanesulfonic acid buffer (MES) The pH value of the sodium carboxymethyl cellulose aqueous solution is 5.7;

[0031] (2) Dissolve EDC and NHS in the aqueous solution of sodium carboxymethyl cellulose obtained after adjusting the pH in step (1), and then add the dithiobifunctional crosslinking agent 3,3'-dithiodipropionic acid After stirring and dissolving, let stand for 24 hours to form a hydrogel, take out the hydrogel and freeze-dry until the vacuum degree is constant to obtain the soil stabilizer; among them, the amount of EDC and NHS added and the carboxyl content in the sodium carboxymethyl cellulose aqueous solution The molar ratio is 0.8:0.8:...

Embodiment 3

[0034] A method for preparing a soil stabilizer, the operation steps are as follows:

[0035] (1) Dissolve 10g of sodium carboxymethylcellulose with a degree of substitution of 0.6 in 400ml of aqueous solution to obtain a 25g / L sodium carboxymethylcellulose aqueous solution, and adjust the pH value of the sodium carboxymethylcellulose aqueous solution with hydrochloric acid Is 5.8;

[0036] (2) Dissolve EDC and NHS in the aqueous solution of sodium carboxymethyl cellulose obtained after adjusting the pH in step (1), and then add the dithiobifunctional crosslinking agent 3,3'-dithiodipropionic acid After stirring and dissolving, let stand for 36 hours to form a hydrogel. After dialyzing the obtained hydrogel in water for 2 days, soak it in a 5% mass concentration of plant growth regulator indole acetic acid solution for 2 days, load the plant growth regulator, and then take it out The loaded hydrogel is freeze-dried to a constant vacuum to obtain a soil stabilizer; wherein the mola...

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Abstract

The invention discloses a preparation method of a soil stabilizing agent. The method includes: (1) dissolving sodium carboxymethylcellulose in a water solution to prepare a sodium carboxymethylcellulose water solution, and regulating the pH value thereof; (2) dissolving 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide in the sodium carboxymethylcellulose water solution, adding a dithio bis-functional group crosslinker, stirring the mixture and allowing the mixture to stand for forming hydrogel, and freeze-drying the hydrogel to obtain the soil stabilizing agent. By means of the natural polymer, sodium carboxymethylcellulose, being a base material, the hydrogel having redox responsibility is prepared through a crosslinking reaction. When being applied tosoil, the soil stabilizing agent is reacted with reductive substances in the soil to damage the crosslinking structure, so that cellulose structure can be combined with heavy metal ions in the soil through the thiol functional groups on the surface, thus reducing bioavailability and mobility of the heavy metal ions.

Description

Technical field [0001] The invention belongs to the technical field of heavy metal contaminated soil remediation, and relates to a method for preparing a soil stabilizer. Background technique [0002] In recent years, due to the intensification of human industrial activities and the rapid development of urbanization, serious accumulation and deposition of heavy metals have been caused. Especially in the fields of mining, metallurgy, electroplating, chemical industry, fossil energy combustion and electronic waste recycling, a large number of heavy metal pollutants are deposited into the soil through wind and hydraulic transportation processes, causing soil heavy metal pollution. The heavy metals polluted by the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As), the most toxic and hazardous elements, and the generally toxic zinc (Zn), Elements such as copper (Cu) and nickel (Ni). Heavy metal pollutants are relatively stable in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32B09C1/08A01N43/38A01N43/90A01N37/10A01N25/10A01P21/00C09K101/00
CPCA01N25/10A01N37/10A01N43/38A01N43/90B09C1/08C09K17/32C09K2101/00
Inventor 潘远凤侯肖邦肖惠宁
Owner GUANGXI UNIV
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