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Passivator for Cd and Pb pollution in farmland soil and preparation method and restoration method of passivator

A technology of passivating agent and soil, which is applied in the field of remediation of heavy metal-contaminated soil, can solve the problems that the remediation ability of passivating agent needs to be improved, and achieve the effect of low cost, simple operation process and good repair effect

Active Publication Date: 2020-07-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for soils that are increasingly polluted, the remediation ability of passivators still needs to be improved, and there is an urgent need for methods to further improve the remediation ability of passivators.

Method used

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  • Passivator for Cd and Pb pollution in farmland soil and preparation method and restoration method of passivator
  • Passivator for Cd and Pb pollution in farmland soil and preparation method and restoration method of passivator
  • Passivator for Cd and Pb pollution in farmland soil and preparation method and restoration method of passivator

Examples

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Effect test

Embodiment 1

[0027] Cd and Pb pollution passivation agents in farmland soil, including modified attapulgite, biochar, quicklime and phosphate, the total molar amount of effective Cd and Pb extracted from the soil: added to the modified attapulgite The total molar ratio of the reduced iron powder is 8, the core-shell particles added in the modified attapulgite account for 6% of the mass percentage of attapulgite, and the mass ratio of biochar to soil is 0.0025:1. The mass ratio of charcoal to quicklime is 1:1, and the total molar ratio of phosphate to reduced iron powder is 5:1. The phosphate is watered in the form of aqueous solution, and the water content of the soil after watering is 12% higher than that before watering. . The specific modification method of attapulgite is: (1) preparation of core-shell particles, preparing iron powder, selecting reduced iron powder with a particle size of 1 μm, and reducing iron powder: deionized water mass ratio of 1.5:1 in a ratio of 60 ℃ for 4 hours...

Embodiment 2

[0029] Cd and Pb pollution passivation agents in farmland soil, including modified attapulgite, biochar, quicklime and phosphate, the total molar amount of effective Cd and Pb extracted from the soil: added to the modified attapulgite The total molar ratio of the reduced iron powder is 8, the core-shell particles added in the modified attapulgite account for 7% of the mass percentage of attapulgite, and the mass ratio of biochar to soil is 0.0025:1. The mass ratio of charcoal to quicklime is 1:1, and the total molar ratio of phosphate to reduced iron powder is 5:1. The phosphate is watered in the form of aqueous solution, and the water content of the soil after watering is 12% higher than that before watering. . The specific modification method of attapulgite is: (1) preparation of core-shell particles, preparing iron powder, selecting reduced iron powder with a particle size of 3 μm, and reducing iron powder: deionized water mass ratio of 1.7:1 in a ratio of 65 Leave it to r...

Embodiment 3

[0031] Cd and Pb pollution passivation agents in farmland soil, including modified attapulgite, biochar, quicklime and phosphate, the total molar amount of effective Cd and Pb extracted from the soil: added to the modified attapulgite The total molar ratio of the reduced iron powder is 8, the core-shell particles added in the modified attapulgite account for 8% of the mass percentage of attapulgite, and the mass ratio of biochar to soil is 0.0025:1. The mass ratio of charcoal to quicklime is 1:1, and the total molar ratio of phosphate to reduced iron powder is 5:1. The phosphate is watered in the form of aqueous solution, and the water content of the soil after watering is 12% higher than that before watering. . The specific modification method of attapulgite is: (1) preparation of core-shell particles, preparing iron powder, selecting reduced iron powder with a particle size of 5 μm, and reducing iron powder: deionized water mass ratio of 2:1 in a ratio of 70 Standing reacti...

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Abstract

The invention discloses an improved farmland contaminated soil passivator, a preparation method thereof and a soil remediation method, the passivator mainly aims at heavy metal pollutants Cd and Pb infarmland soil, and the passivator is composed of modified attapulgite, biochar, quick lime and phosphate. The attapulgite is modified, so that the attapulgite is loaded with nano iron oxide or ferrichydroxide core-shell particles, and the adsorption and repair capacity of the attapulgite is enhanced. The repairing technological process is optimized, the adding sequence of passivator components is specifically optimized, and the repairing effect is better.

Description

technical field [0001] The invention relates to the remediation of heavy metal polluted soil, in particular to a passivator for Cd and Pb pollution in farmland soil, a preparation method thereof and a soil remediation method. Background technique [0002] With the development of urbanization and industrialization and the entry of urban sludge and waste into the agricultural ecosystem, the situation of soil heavy metal pollution is becoming increasingly severe. According to the investigations of the Ministry of Environmental Protection and the Ministry of Land and Resources [our country's soil pollutants exceeded the standard points accounted for 16.1% of the total survey points; while the rate of cultivated soil points exceeded the standard as high as 19.4%, the pollution situation is not optimistic. In recent years, heavy metal pollution incidents have occurred frequently in my country, and the exposure of "cadmium rice" and "cadmium wheat" incidents has also aroused widesp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K101/00
CPCC09K17/08C09K2101/00
Inventor 赵玉岩李涵汤肖丹来雅文姜伟明
Owner JILIN UNIV
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