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Preparation and application of a surface-modified ferrous sulfide soil heavy metal passivator doped with silica

A technology of heavy metal passivator and ferrous sulfide, which is applied in application, soil conditioning materials, chemical instruments and methods, etc., can solve problems such as poor storage stability, safety accidents, and easy oxidation, so as to improve stability and safety , improve the effect of absorption

Active Publication Date: 2022-01-28
HENAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a passivator, ferrous sulfide has a good passivation effect on a variety of heavy metals, and it can play a very good role in the restoration of heavy metal-contaminated soil; but at the same time, due to its easy oxidation and poor storage stability, it is easy to cause safety accidents. limit its wide application

Method used

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  • Preparation and application of a surface-modified ferrous sulfide soil heavy metal passivator doped with silica
  • Preparation and application of a surface-modified ferrous sulfide soil heavy metal passivator doped with silica
  • Preparation and application of a surface-modified ferrous sulfide soil heavy metal passivator doped with silica

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of a surface-modified ferrous sulfide passivator doped with silicon dioxide, comprising the following steps:

[0036] 1) Weigh 34.3 g (0.306 mol) of potassium sulfide (purity 98.0%) in a 1000ml three-necked flask, dissolve 4.0 g of potassium hydroxide in 50 mL of deionized water, add it to the three-necked flask, and stir evenly (pH is 12-13 ), heated up to 40 ℃;

[0037] 2) Disperse 53.2 g of natronine (28.22% silica concentration) in 100 mL of deionized water, slowly add it into a three-necked flask with stirring at 40 °C, and react at 40 °C for 0.5 h;

[0038] 3) Dissolve 43.1 g (0.340 mol) of ferrous chloride (purity 99%) in 200 mL of deionized water, slowly add it dropwise into a three-necked flask with stirring at 40 °C, and react at 40 °C for 2 h;

[0039] 4) Dissolve 5.9 g (0.034 mol) sodium diethyldithiocarbamate (purity 99%) in 100 mL deionized water, slowly add it dropwise into a three-necked flask with stirring at 60 °C, and react at 60...

Embodiment 2

[0042] A preparation method of a surface-modified ferrous sulfide passivator doped with silicon dioxide, comprising the following steps:

[0043]1) Weigh 122.4 g (0.306mol) of ammonium sulfide (purity 17%) in a 1000 mL three-necked flask, dissolve 4.0 g of sodium hydroxide in 50 mL of deionized water, add it to the three-necked flask, and stir evenly (pH is 12~ 13), heating up to 40 ℃;

[0044] 2) Disperse 53.2 g of natronine (28.22% silica concentration) in 100 mL of deionized water, slowly add it into a three-necked flask with stirring at 40 °C, and react at 40 °C for 0.5 h;

[0045] 3) Dissolve 95.5 g (0.340 mol) of ferrous sulfate heptahydrate (99% purity) in 200 mL of deionized water, slowly add it dropwise into a three-necked flask with stirring at 40 °C, and react at 40 °C for 2 h;

[0046] 4) Dissolve 12.2 g (0.034 mol) of sodium dimethyldithiocarbamate (40% purity) in 100 mL of deionized water, slowly add it dropwise into a three-necked flask with stirring at 60 °C, ...

Embodiment 3

[0053] A preparation method of a surface-modified ferrous sulfide passivator doped with silicon dioxide, comprising the following steps:

[0054] 1) Weigh 64.8 g (0.162 mol) of ammonium sulfide (purity 17%) in a 1000 mL three-necked flask, dissolve 1.5 g of sodium hydroxide in 30 mL of deionized water, add it to the three-necked flask, and stir evenly (pH is 12~ 13);

[0055] 2) Disperse 26.2 g of natron (silica concentration 28.22%) in 50 mL of deionized water, slowly add it into a three-necked flask with stirring at 40 °C, and react at 40 °C for 0.5 h;

[0056] 3) Dissolve 47.7 g (0.170 mol) of ferrous sulfate heptahydrate (purity 99%) in 150 mL of deionized water, slowly add it into a three-necked flask with stirring at 40 °C, and react at 40 °C for 2 h;

[0057] 4) Dissolve 3.1 g (0.009 mol) of sodium dimethyldithiocarbamate (40% purity) in 50 mL of deionized water, slowly add it into a three-necked flask with stirring at 60 °C, and react at 60 °C for 1 h to obtain the re...

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Abstract

The invention belongs to the technical field of soil heavy metal pollution control, and in particular relates to the preparation and application of a ferrous sulfide soil heavy metal passivator doped with silicon dioxide on the surface. The preparation method of the heavy metal deactivator comprises: dissolving sulfide in aqueous sodium hydroxide solution, adding sodium hydroxide aqueous solution and mixing evenly to make alkali liquor under stirring conditions, then adding aqueous solution of ferrous salt, and sodium hydroxide generates nanometer di At the same time, ferrous salt of silicon oxide particles reacts with metal sulfide to generate ferrous sulfide, and then adds organic modifier to obtain it. The passivating agent of the present invention has good passivation effect on various heavy metals such as Cu, Pb, Cd, As, etc., and can be directly added to the soil for passivation treatment of heavy metals, and not only has a good passivation repair function At the same time, due to the role of nano-silica can significantly improve the absorption of silicon by plants, the product can be used for the restoration of heavy metal-contaminated soil, and can also play a certain role in soil ecological restoration.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and in particular relates to a ferrous sulfide soil heavy metal passivator doped with silicon dioxide on the surface, a preparation method and an application. Background technique [0002] In the era of rapid industrial development, metal smelting, industrial wastewater discharge and the use of agricultural pesticides have caused a large amount of heavy metals to enter the environment, and the heavy metal pollution has become increasingly serious. The accumulation of heavy metals in plants, animals and microorganisms will cause serious poisoning to them, and can endanger humans through the food chain. Researchers have been working on technical research on the restoration and governance of environmental pollution. Among many repair materials, heavy metal adsorption passivation materials can be directly added to the soil to reduce the mobility of heavy metals to achieve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
CPCC09K17/40B01J20/0229B01J20/0266B01J20/22B01J20/28007B01J20/3085B01J20/103B09C2101/00B09C1/08C09K17/02
Inventor 宋纯鹏李超然廉铭铭李小红张治军
Owner HENAN UNIVERSITY
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