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Soil remediation agent and preparation method and application thereof

A technology of soil remediation agent and reducing agent, which is applied in the field of soil remediation agent and its preparation, and can solve the problems of high remediation cost, increased dosage of agents, and less research on compound pollution of various heavy metals.

Inactive Publication Date: 2020-10-30
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many studies on soil remediation of single heavy metal pollution alone, but less research on multiple heavy metal pollution
It is difficult for the existing single stabilizing agent to meet the remediation goals of arsenic and cadmium at the same time
Increasing the dose of chemicals or using expensive stabilizers can meet the restoration goals to a certain extent, but the restoration cost is high

Method used

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  • Soil remediation agent and preparation method and application thereof
  • Soil remediation agent and preparation method and application thereof
  • Soil remediation agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Soak the natural sepiolite in water, the mass ratio of natural sepiolite to water is 1:5, dry and crush to 120 mesh, then put the sepiolite into 1mol / L nitric acid solution, at 70°C Stir in a constant temperature water bath for 3 hours, then wash with deionized water for 3 times, roast the acid-modified sepiolite at 220°C for 4 hours, cool it and put it in a desiccator for later use;

[0071] (2) take by weighing 0.9g chitosan and be dissolved in the dilute nitric acid solution that 100ml concentration is 0.01mol / L, filter with syringe then;

[0072] (3) Weigh 2.780g FeSO 4 ·7H 2 O, dissolved in 100ml deionized water to obtain FeSO 4 solution;

[0073] (4) Mix modified sepiolite 10g, chitosan nitric acid solution and FeSO 4 The solution was poured into the Erlenmeyer flask together, and began to fill with nitrogen, and stirred for 10min;

[0074] (5) Dissolve 1.079g of potassium borohydride in 100ml of water, pour into a constant pressure funnel, add potassium ...

Embodiment 2

[0078] (1) Soak the natural sepiolite in water, the mass ratio of natural sepiolite to water is 1:10, dry and crush to 80 mesh, then put the sepiolite into the nitric acid solution of 5mol / L, at 40°C Stir in a constant temperature water bath for 5 hours, then wash with deionized water for 3 times, roast the acid-modified sepiolite at 180°C for 6 hours, cool it and put it in a desiccator for later use;

[0079] (2) take by weighing 1.2g chitosan and be dissolved in the dilute nitric acid solution that 100ml concentration is 0.05mol / L, filter with syringe then;

[0080] (3) Weigh 2.788gFeSO 4 ·7H 2 O, dissolved in 100ml deionized water to obtain FeSO 4 solution;

[0081] (4) Mix modified sepiolite 10g, chitosan nitric acid solution and FeSO 4 The solution was poured into the Erlenmeyer flask together, and began to fill with nitrogen, and stirred for 10min;

[0082] (5) Dissolve 2.798g of potassium borohydride in 100ml of water, pour into a constant pressure funnel, add pota...

Embodiment 3

[0086] (1) Soak the natural sepiolite in water, the mass ratio of natural sepiolite to water is 1:8, dry and crush to 100 mesh, then put the sepiolite into 3mol / L hydrochloric acid solution, at 50°C Stir in a constant temperature water bath for 4 hours, then wash with deionized water for 3 times, roast the acid-modified sepiolite at 200°C for 5 hours, cool it and put it in a desiccator for later use;

[0087] (2) Weigh 2.788gFeSO 4 ·7H 2 O, dissolved in 100ml deionized water to obtain FeSO 4 solution;

[0088] (3) 50g modified sepiolite, 0.5 chitosan, 100ml concentration of nitric acid solution and FeSO 4 The solution was poured into the Erlenmeyer flask together, and began to fill with nitrogen, and stirred for 10min;

[0089] (4) Dissolve 3.237g of potassium borohydride in 100ml of water, pour into a constant pressure funnel, add the potassium borohydride solution drop by drop, stir until no bubbles are produced, separate the product by magnetic separation, and pour out ...

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Abstract

The invention provides a soil remediation agent as well as a preparation method and application thereof. The preparation method of the soil remediation agent comprises the following steps: soaking sepiolite with an acid, and then roasting to obtain modified sepiolite; mixing raw materials including the modified sepiolite, chitosan, nitric acid, a ferrite and a reducing agent, and performing solid-liquid separation after reaction to obtain a solid. The soil remediation agent is prepared by using the preparation method. The application of the soil remediation agent is used for remediating cadmium and arsenic contaminated soil. According to the soil remediation agent provided by the invention, the content of arsenic and cadmium in the remediated soil is greatly reduced, and the soil remediation agent has an excellent solidification and stabilization effect on the cadmium and arsenic in the soil.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a soil remediation agent and its preparation method and application. Background technique [0002] Solidification and stabilization restoration technology is currently the most common restoration method in soil heavy metal restoration. By adding a curing agent / stabilizer to the contaminated soil to adjust the physical and chemical properties of the polluted soil, the proportion of heavy metals in the soil and the biologically effective sex, mobility, etc. Compared with other remediation technologies, solidification and stabilization remediation technology has the advantages of low cost, convenient construction, and fast effect, and has been one of the efficient remediation methods for controlling soil pollution for a long time. [0003] At present, there are many studies on soil remediation of single heavy metal pollution, but less research on multiple heavy metal polluti...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08B09C2101/00C09K17/40
Inventor 苏文湫林星杰苗雨宋爽陈谦陈玉福
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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