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Mercury-polluted soil remediation agent and preparation method thereof

A soil remediation agent and mercury pollution technology, which is applied in the field of soil mercury pollution control, can solve problems such as restrictions on the use of selenium-containing soil remediation agents, and achieve the effects of reducing selenium content in plants, reducing the effect, and reducing risks

Active Publication Date: 2022-02-15
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in these mercury ore polluted areas rich in selenium, the use of selenium-containing soil remediation agents is more restricted.

Method used

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  • Mercury-polluted soil remediation agent and preparation method thereof
  • Mercury-polluted soil remediation agent and preparation method thereof
  • Mercury-polluted soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a mercury-contaminated soil remediation agent (selenosulfur-modified montmorillonite), and its preparation method is as follows:

[0042] Add 0.271 parts by weight of sodium selenite into deionized water. After fully dissolving, add 5.8 parts by weight of sodium sulfide nonahydrate. After fully dissolving, slowly add 150 parts by weight of montmorillonite, stir and react at room temperature for 24 hours, and centrifuge to separate the solid product Dry it in an oven at 105°C, grind it finely, and pass through a 100-mesh sieve to obtain a mercury-contaminated soil remediation agent (selenium-sulfur modified montmorillonite).

[0043] This embodiment also prepares a selenium-modified montmorillonite, and the preparation method is as follows: add sodium selenite 0.271 into deionized water, after fully dissolving, slowly add 150 parts by weight of montmorillonite, stir and react at room temperature for 4 hours, centrifuge, Dry the solid produ...

Embodiment 2

[0045] The present embodiment provides a mercury-contaminated soil remediation agent (Selenium Sulfur Modified Medical Stone), and its preparation method is as follows:

[0046] Add 0.28 parts by weight of sodium selenite into deionized water. After fully dissolving, add 6.5 parts by weight of sodium sulfide nonahydrate. After fully dissolving, slowly add 160 parts by weight of medical stone, stir and react at room temperature for 24 hours, and centrifuge to separate the solid product Dry it in an oven at 105°C, grind it finely, and pass through a 100-mesh sieve to obtain a mercury-contaminated soil remediation agent (selenium-sulfur modified medical stone).

Embodiment 3

[0048] The present embodiment provides a mercury-contaminated soil remediation agent (selenothiol-modified montmorillonite), and its preparation method is as follows:

[0049] Add 0.279 parts by weight of sodium selenite into deionized water, fully dissolve, slowly add 160 parts by weight of montmorillonite, stir and react at room temperature for 4 hours, centrifuge, dry the solid product in an oven at 105 ° C, grind it finely, pass 100 mesh sieve to obtain selenium modified montmorillonite;

[0050] Thioglycolic acid, ethanol and water are configured into a mixed solution at a volume ratio of 1:8:0.5, and the above-mentioned selenium-modified montmorillonite is added to the mixed solution (containing 8.5 parts by weight of thioglycolic acid), stirred and reacted at room temperature for 8 hours, and centrifuged. Wash the solid product with absolute ethanol (no obvious mercapto group odor), dry it in an oven at 80°C, grind it finely, and pass it through a 100-mesh sieve to obta...

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Abstract

The invention provides a mercury-polluted soil remediation agent and a preparation method thereof. The mercury-polluted soil remediation agent comprises clay mineral, and selenite and a sulfur-containing compound which are bonded on the clay mineral; wherein the clay mineral is montmorillonite and / or medical stone, and the sulfur-containing compound is a soluble sulfide and / or a sulfydryl-containing compound. The mercury-polluted soil remediation agent is prepared by a method of mixing and reacting various clay minerals, selenite and a sulfur-containing compound in a solvent. The selenium-containing remediation agent for mercury-polluted soil provided by the invention not only can improve the reduction effect of each component on the mercury content of crops, but also can reduce the enrichment capacity of the crops on selenium, and reduces the risk that the selenium of the crops is greatly increased due to the addition of selenium.

Description

technical field [0001] The invention belongs to the technical field of soil mercury pollution control, and in particular relates to a mercury-polluted soil remediation agent and a preparation method thereof. Background technique [0002] Mercury is a highly toxic, persistent heavy metal pollutant that can be absorbed by organisms and enriched along the food chain. The mining and smelting activities of mercury mines, especially the traditional indigenous method of mercury smelting, can easily lead to serious excess mercury content in the mercury mining area and the ecosystem around the watershed, seriously threatening the safety of the ecological environment and human health. [0003] The remediation technologies for soil heavy metals (mainly Mn, Pb, Zn, Cr, etc.) mainly include phytoextraction remediation method, stable curing method, thermal desorption method, leaching method, etc., all of which can achieve certain remediation effects. However, due to the special mercury e...

Claims

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Application Information

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IPC IPC(8): C09K17/08C09K17/40B09C1/08C09K101/00
CPCC09K17/08C09K17/40B09C1/08C09K2101/00B09C2101/00Y02P10/20
Inventor 何天容李胜鹏尹德良冉澍周宪
Owner GUIZHOU UNIV
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