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Composite material for passivating heavy metal nickel in soil as well as preparation and application methods thereof

A technology of composite materials and application methods, which is applied in the field of composite materials for passive soil heavy metal nickel, can solve the problems of poor long-term stability and change of soil physical and chemical properties, and achieve the effects of stable adsorption, environmental friendliness and high efficiency

Inactive Publication Date: 2020-08-25
苏州市相润土壤修复技术研究院有限公司
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Problems solved by technology

[0008] In view of the shortcomings of conventional solidification technology that significantly changes the physical and chemical properties of soil and poor long-term stability, organically modified layered double metal hydroxides are used to adsorb heavy metals in soil, and the characteristics of heavy metals that can form chelate coordination bonds with organic phosphates are used. Synthesis of organophosphate-modified layered double hydroxides for long-term and stable passivation of heavy metals in soil

Method used

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  • Composite material for passivating heavy metal nickel in soil as well as preparation and application methods thereof
  • Composite material for passivating heavy metal nickel in soil as well as preparation and application methods thereof

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Embodiment 1

[0050] A kind of passivation soil heavy metal nickel composite material and its preparation and application method to the leaching toxicity assessment of heavy metal nickel, the steps are:

[0051] (1) Calcining the carbonate-saturated magnesium-aluminum layered double hydroxide at 500 degrees Celsius; mixing the magnesium-aluminum layered double hydroxide after high-temperature calcining with organic phosphate in a mass ratio of 10:3; Add deionized water to the calcined magnesium-aluminum layered double hydroxide and organic phosphate mixture to obtain a suspension; after magnetically stirring the suspension for 24 hours, centrifuge, pour out the supernatant, and remove the precipitate Freeze-drying treatment; grind the freeze-dried sample into powder, sieve and store it to obtain a composite material; apply the obtained composite material to the leaching toxicity test of heavy metal nickel.

[0052] (2) Concentrated sulfuric acid and concentrated nitric acid (2:1) were added...

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Abstract

The invention discloses a composite material for passivating heavy metal nickel in soil as well as preparation and application methods of the composite material, belongs to the field of soil remediation, and overcomes the defect that the soil heavy metal immobilization effect is realized by changing the pH value of soil in an existing soil remediation method. According to the invention, layered double hydroxide is used as a template, and a novel heavy metal passivator composite material is prepared through organic phosphate modification. Adsorption kinetics results show that the organic phosphate modified layered double hydroxide can quickly adsorb nickel ions to achieve adsorption equilibrium. In addition, leaching toxicity results show that the prepared composite material can significantly reduce the leaching efficiency of heavy metals under acidic conditions.

Description

[0001] The invention belongs to the field of soil remediation, and more specifically relates to a composite material for passivating soil heavy metal nickel and a preparation and application method thereof. Background technique [0002] With the rapid development of my country's economy, cultivated land is polluted by toxic heavy metals, among which nickel is listed as one of the eight major heavy metal pollution by the Ministry of Environmental Protection of the People's Republic of China [Ministry of Environmental Protection of the People's Republic of China. National Soil Pollution Survey Bulletin]. As one of the major environmental problems in my country, the remediation of heavy metal-contaminated soil has attracted widespread attention from the society [Wang Hui, Xu Chao et al. Fixation of multiple metals in contaminated soil by different passivators [J]. Hunan Agricultural Science 2018, 11: 38-41]. [0003] The migration ability of heavy metals in soil significantly affe...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08G01N1/34G01N1/38G01N1/44G01N21/31
CPCB09C1/08C09K17/40G01N1/34G01N1/38G01N1/44G01N21/3103
Inventor 王国红姜敬龙王强
Owner 苏州市相润土壤修复技术研究院有限公司
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