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A kind of mercury-contaminated 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: 2022-08-09
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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  • A kind of mercury-contaminated soil remediation agent and preparation method thereof
  • A kind of mercury-contaminated soil remediation agent and preparation method thereof
  • A kind of mercury-contaminated 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 (selenium-sulfur-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 at room temperature for 24 hours, centrifuge to separate the solid product It was dried in an oven at 105° C., ground finely, and passed through a 100-mesh sieve to obtain a mercury-contaminated soil remediation agent (selenium-sulfur-modified montmorillonite).

[0043] In this example, a selenium-modified montmorillonite was also prepared, and the preparation method was as follows: adding 0.271 of sodium selenite into deionized water, after fully dissolving, slowly adding 150 parts by weight of montmorillonite, stirring and reacting at room temperature for 4 hours, and centrifug...

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 at room temperature for 24 hours, centrifuge to separate the solid product It was dried in an oven at 105° C., ground finely, and passed 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 (selenium mercapto-modified montmorillonite), and its preparation method is as follows:

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

[0050] The thioglycolic acid, ethanol and water were configured into a mixed solution in a volume ratio of 1:8:0.5, and the above-mentioned selenium-modified montmorillonite was added to the mixed solution (containing 8.5 parts by weight of thioglycolic acid), and the reaction was stirred at room temperature for 8 hours, and centrifuged. The solid product was washed with absolute ethanol (no obvious sulfhydryl odor), dried in an oven at 80° C., ground finely, and passed through a 100-me...

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Abstract

The invention provides a mercury-contaminated soil remediation agent and a preparation method thereof. The mercury-contaminated soil remediation agent includes: clay minerals, and selenite and sulfur-containing compounds bonded to the clay minerals; the clay minerals are montmorillonite and / or medical stone, and the sulfur-containing compounds are The compounds are soluble sulfides and / or mercapto-containing compounds. The mercury-contaminated soil remediation agent is prepared by mixing and reacting various clay minerals, selenite and sulfur-containing compounds in a solvent. The selenium-containing repairing agent for mercury-contaminated soil provided by the invention can not only improve the reducing effect of each component on the mercury content of crops, but also reduce the enrichment ability of crops for selenium, and reduce the risk of a large increase of selenium in crops caused by adding selenium .

Description

technical field [0001] The invention belongs to the technical field of soil mercury pollution control, and particularly relates to a mercury-contaminated soil remediation agent and a preparation method thereof. Background technique [0002] Mercury is a highly toxic, persistent heavy metal contaminant that can be bioabsorbed and enriched along the food chain. The mining and smelting activities of mercury mines, especially the traditional local method of mercury smelting, can easily lead to the mercury content in the mercury mining area and the surrounding ecosystems exceeding the standard, which seriously threatens 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 solidification method, thermal desorption method, leaching method, etc., all of which can play a certain remediation effect. However, due to the special mercu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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