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Fixing agent for repairing arsenic-antimony compound contaminated soil and preparation method and application thereof

A technology of polluted soil and fixative, applied in the field of arsenic and antimony polluted soil treatment, can solve problems such as insignificant effect, and achieve the effects of preventing agglomeration, uniform and stable distribution, and increasing fertility

Inactive Publication Date: 2020-11-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although single biochar has a certain adsorption and passivation effect on arsenic and antimony, the effect is not significant

Method used

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  • Fixing agent for repairing arsenic-antimony compound contaminated soil and preparation method and application thereof
  • Fixing agent for repairing arsenic-antimony compound contaminated soil and preparation method and application thereof
  • Fixing agent for repairing arsenic-antimony compound contaminated soil and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare the fixative for repairing arsenic-antimony compound polluted soil of the present invention:

[0041] (1) Preparation of Fe 3+ Concentration is the ferric chloride solution of 0.5mol / L,

[0042] (2) Regulate ferric chloride solution pH to 1.6 with the sodium hydroxide solution of 8-10mol / L;

[0043] (3) Add 100 mL of ferric chloride solution to 10.0 g of straw powder treated with sodium hypochlorite, mix well and place in a high-pressure reactor with a volume of 150 mL;

[0044] (4) Place the reaction kettle in a muffle furnace, set the conditions as a temperature of 240°C, a heating rate of 5°C / min, and a holding time of 3h;

[0045] (5) After the reaction kettle was cooled to room temperature, the prepared biochar was suction-filtered, washed with deionized water for 3 times, and dried at 60°C to obtain ferric chloride and straw as raw materials. Iron-based biochar is also the fixing agent of the present invention.

Embodiment 2

[0047] Preparation of the present invention repairs arsenic-antimony composite contaminated soil fixative: other conditions are the same as in Example 1, except that during step (1), Fe 3+ A solution of ferric chloride with a concentration of 0.1 mol / L.

Embodiment 3

[0049] Preparation of fixative for remediating arsenic-antimony composite polluted soil of the present invention: other conditions are the same as in Example 1, except that in step (1), the pH of the ferric chloride solution is adjusted to 1.0.

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Abstract

The invention discloses a preparation method and application of a fixing agent for repairing arsenic-antimony combined pollution soil. The preparation method of the fixing agent comprises the following steps: 1) by taking an iron salt solution as a modifier, adding straw powder, adjusting the pH value, and filling into a high-pressure reaction kettle, 2) heating the reaction kettle in a muffle furnace, and 3) washing, filtering and drying the reaction product to obtain the chemical fixing agent. After the prepared fixing agent is mixed with soil according to a certain proportion, the effective-state As (III) and As (V) in the contaminated soil are reduced by 42.06% and 50.67% respectively, and the effective-state Sb (III) and Sb (V) are reduced by 21.57% and 59.66% respectively. Non-specific adsorption state arsenic and specific adsorption state arsenic in the soil are respectively reduced by 10% and 11%, the non-specific adsorption-state antimony and the specific adsorption-state antimony are reduced by 8% and 16% respectively, and the fixing agent is simple in preparation process, low in cost and capable of effectively reducing mobility and bioavailability of arsenic and antimonyin soil.

Description

technical field [0001] The invention belongs to the field of arsenic-antimony polluted soil treatment, in particular to a fixative for repairing arsenic-antimony complex polluted soil, a preparation method and application thereof. Background technique [0002] At present, common methods to control heavy metal pollution in soil include physical and chemical methods such as soil leaching, soil upturning, chemical fixation, electric restoration, etc. These methods have fast and efficient decontamination effects, but due to their complex equipment, they require The cost of input is high, the soil disturbance is large, it is not suitable for large-scale application to large-scale contaminated soil, and it often destroys the soil structure, resulting in the decline of soil biological activity and soil fertility degradation, so chemical fixation has become a feasible option. Due to its strong adsorption performance, wide applicability, low cost, and little soil disturbance, biochar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00C09K109/00
CPCB09C1/08C09K17/02C09K2101/00C09K2109/00
Inventor 杨志辉高世康黄培成杨卫春廖骐石岩曾盖
Owner CENT SOUTH UNIV
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