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Passivator for repairing mercury-polluted soil as well as preparation method and application thereof

A technology of soil passivation and passivating agent, which is applied in the field of mercury-contaminated soil remediation, can solve the problems of selenium-contaminated soil and low risk of mercury secondary release, and achieve the effect of wide sources, favorable reuse and low price

Active Publication Date: 2021-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the single use of sulfur for passivation has the risk of secondary release of mercury
However, selenium has a strong combination with mercury, and the risk of secondary release of mercury is low, but excessive selenium may pollute the soil

Method used

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  • Passivator for repairing mercury-polluted soil as well as preparation method and application thereof
  • Passivator for repairing mercury-polluted soil as well as preparation method and application thereof
  • Passivator for repairing mercury-polluted soil as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the preparation process of the soil passivation agent described in this example, the ratio of sodium selenite to ferrous sulfide-loaded biochar is 0.051mmol: 5g, and the preparation process is as follows:

[0043] (1) After washing the pomelo peel with deionized water for 3 times, put it in an oven at 105°C and dry it for 1 day; grind it with a mortar for 10 minutes to make the particle size pass through a 10-mesh sieve.

[0044] (3) Put the dried and ground pomelo peel in a 200ml aluminum box, the volume of the aluminum box is Cover it, put it into the muffle furnace, set the heating rate to 300°C / h, the carbonization temperature to 600°C, and the holding time to 2h.

[0045](4) Take 20 g of the biochar produced in step (3) and place it in 200 ml of 0.045 mol / L ferrous solution, and stir at a speed of 800 rpm for 12 h, and the gas atmosphere is nitrogen. After 24 hours, 200 ml of 0.045 mol sodium sulfide solution was added dropwise within 10 minutes, reacted for 5...

Embodiment 2

[0049] In the preparation process of the soil passivation agent described in this example, the ratio of sodium selenite to ferrous sulfide-loaded biochar is 0.506mmol: 5g, and the preparation process is as follows:

[0050] Other conditions are the same as in Example 1, except that during step (5), 5 g of ferrous sulfide loaded biochar will be placed in the sodium selenite solution of 1000ml 0.506mmol / L, and stirred at a speed of 800rpm for 24h, gas The atmosphere is nitrogen. Be the product of Example 2 after freeze-drying.

Embodiment 3

[0052] In the preparation process of the soil passivation agent described in this example, the ratio of sodium selenite to ferrous sulfide-loaded biochar is 5.06mmol: 5g, and the preparation process is as follows:

[0053] Other conditions are the same as in Example 1, except that during step (5), the ferrous sulfide loaded biochar 5g will be placed in the sodium selenite solution of 1000ml 5.06mmol / L, and stirred at a speed of 800rpm for 24h, gas The atmosphere is nitrogen. Be the product of Example 3 after freeze-drying.

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Abstract

The invention discloses a passivator for repairing mercury-polluted soil as well as preparation and application thereof. According to an iron-sulfur-selenium loaded biochar material disclosed by the invention, ferrous sulfide and sodium selenite are taken as central substances, shaddock peel biochar subjected to anoxic high-temperature carbonization is taken as a carrier, and a method of loading iron-sulfur-selenium on biochar is adopted, so that the passivator for repairing mercury-polluted soil is prepared. The synthesized passivation material is added into mercury-polluted soil according to a certain proportion, standing is conducted for 30 days, the highest removal rate of TCLP and water leaching mercury in the mercury-polluted soil can reach 99% or above, and the exchangeable state, the carbonate binding state and the amorphous iron-manganese oxidation state in the soil are obviously converted into the organic binding state and the residue state. The iron-sulfur-selenium biochar material disclosed by the invention is simple in preparation process and low in cost, and can effectively reduce the mobility and bioavailability of mercury in soil.

Description

technical field [0001] The invention belongs to the technical field of mercury-contaminated soil remediation, and in particular relates to a passivator for remediating mercury-contaminated soil and its preparation method and application. Background technique [0002] Mercury is an environmental pollutant with strong toxicity to living organisms. Serious damage to the human nervous system. [0003] The existing soil mercury pollution control methods mainly include physical and chemical methods such as soil leaching, soil filling, and thermal volatilization. Due to the large property disturbance, it is not suitable for large-scale application to large-scale mercury-contaminated soils, and often destroys the soil structure, resulting in a decrease in soil biological activity and soil fertility degradation. Therefore, chemical passivation has become a viable option. Due to its strong adsorption performance, wide applicability, low cost, and little soil disturbance, biochar is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02C09K17/04B09C1/08
CPCC09K17/02C09K17/04B09C1/08
Inventor 杨志辉黄培成杨卫春廖骐刘恢曾盖龚航远
Owner CENT SOUTH UNIV
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