Composite material formed by loading basic magnesium carbonate on surface of diatomite, and method for fixing lead in soil

A technology of surface loading and composite materials, applied in soil conditioning materials, restoration of polluted soil, material excitation analysis, etc., can solve the problems of small adsorption capacity, small porosity, low specific surface area, etc., achieve good results and low cost , the effect of simple operation

Active Publication Date: 2021-07-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the natural diatomaceous earth has its own shortcomings such as small porosity and low specific surface area, which make its adsorption capacity small. Therefore, it is necessary to modify or modify this shortcoming to improve the immobilization effect of heavy metal lead ions in soil.

Method used

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  • Composite material formed by loading basic magnesium carbonate on surface of diatomite, and method for fixing lead in soil
  • Composite material formed by loading basic magnesium carbonate on surface of diatomite, and method for fixing lead in soil
  • Composite material formed by loading basic magnesium carbonate on surface of diatomite, and method for fixing lead in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 1.00 kg of the original soil sample through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500 mg kg -1 Contaminated soil, after stirring evenly, let it stand for 90 days, pay attention to add water during the stabilization process.

[0027] (2) Accurately weigh several copies of exogenous lead that have been aged in the early stage and the concentration is 500mg kg -1 Put 5.00g of the soil sample into a 50mL centrifuge tube, add two passivating agents with a mass ratio of 1%, respectively, set up three parallels for each group, mix them evenly, and let them stand and age for 30d.

[0028](3) After the aging of the passivated soil under the above conditions, the morphological distribution of lead in the soil was measured by the BCR continuous leaching experiment, and then the lead concentration was measured by ICP.

Embodiment 2

[0030] (1) Weigh 1.00kg of the original soil sample passed through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500mg·kg -1 The contaminated soil was stirred evenly and then left to age for 90 days. During the stabilization process, pay attention to adding water.

[0031] (2) Accurately weigh a number of exogenous lead concentrations that have been aged in the early stage, and the concentration is 500 mg·kg -1 5.00 g of soil samples were placed in a 50 mL centrifuge tube, and two passivating agents with a mass ratio of 5% were added respectively, and three parallels were set in each group. After mixing evenly, they were left to stand for aging for 30 d.

[0032] (3) After the passivation soil aging was completed under the above conditions, the morphological distribution of lead in the soil was measured by BCR continuous leaching experiment, and then the lead concentration was measured by ICP. ...

Embodiment 3

[0034] (1) Weigh 1.00kg of the original soil sample passed through a 10-mesh sieve into a plastic bucket, add lead nitrate in the form of a solution, and prepare an exogenous lead concentration of 500mg·kg -1 The contaminated soil was stirred evenly and then left to age for 90 days. During the stabilization process, pay attention to adding water.

[0035] (2) Accurately weigh a number of exogenous lead concentrations that have been aged in the early stage, and the concentration is 500 mg·kg -1 5.00 g of the soil sample was placed in a 50 mL centrifuge tube, and two passivating agents with a mass ratio of 10% were added respectively. Three parallels were set for each group. After mixing evenly, it was allowed to stand for aging for 30 d.

[0036] (3) After the passivation soil aging was completed under the above conditions, the morphological distribution of lead in the soil was measured by BCR continuous leaching experiment, and then the lead concentration was measured by ICP. ...

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Abstract

The invention discloses a composite material formed by loading basic magnesium carbonate on the surface of diatomite, and a method for fixing lead in soil, belonging to the field of functional and environmental protection materials. According to the invention, diatomite is used as a carrier and has certain water binding capacity; basic magnesium carbonate is modified on the surface of the diatomite, so a spontaneous ion replacement route with solubility difference as driving force can be established, and metal cations in soil can be driven from a liquid phase to a solid phase of an adsorption material in a humid environment; and therefore, the basic magnesium carbonate-based diatomite composite material can realize efficient synergy of the two materials, and further provides a new thought for development of an adsorption and fixation material for heavy metal lead ions in soil. In addition, the invention provides a reliable and rapid screening method for evaluating a heavy metal passivator for soil, and the method has very high practical application value.

Description

technical field [0001] The invention relates to a method for fixing and analyzing soil heavy metal lead ions based on modified diatomite, specifically a basic magnesium carbonate composite material loaded on the surface of diatomite, and discloses a rapid evaluation method for the performance of the soil passivator, belonging to Functional and environmental protection materials. Background technique [0002] Soil is an important part of the ecosystem and an irreplaceable material basis for human survival and development. However, with the rapid development of urbanization and industrialization in modern society, the types and quantities of agricultural chemicals used are increasing, heavy metals enter the soil environment in large quantities, and the soil environment of cultivated land is even more worrying. In China, 12 million tons of grain are polluted by soil heavy metals every year. , The loss caused can reach 20 billion yuan per year. According to the National Soil P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/04C09K17/08G01N21/73B09C1/08
CPCC09K17/04C09K17/08G01N21/73B09C1/08
Inventor 王金淑杨晨吴俊书孙领民徐梦何恒杜玉成周琴琴李永利
Owner BEIJING UNIV OF TECH
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