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Preparation and application of surface-modified silicon dioxide-doped ferrous sulfide soil heavy metal passivator

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

Active Publication Date: 2021-10-22
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 surface-modified silicon dioxide-doped ferrous sulfide soil heavy metal passivator
  • Preparation and application of surface-modified silicon dioxide-doped ferrous sulfide soil heavy metal passivator
  • Preparation and application of surface-modified silicon dioxide-doped ferrous sulfide soil heavy metal passivator

Examples

Experimental program
Comparison scheme
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) potassium sulfide (purity 98.0%) into a 1000 ml 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 to 40 °C;

[0037] 2) Disperse 53.2 g of paocyanine (silicon dioxide concentration of 28.22%) in 100 mL of deionized water, slowly add it to the 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 to 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 of deionized water, slowly drop it into a three-necked flask with stirring at 60 °C, and react...

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 (0.306 mol) 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), heated to 40 ℃;

[0044] 2) Disperse 53.2 g of paocyanine (silicon dioxide concentration of 28.22%) in 100 mL of deionized water, slowly add it to the 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) ferrous sulfate heptahydrate (purity 99%) in 200 mL of deionized water, slowly drop it 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) sodium dimethyldithiocarbamate (purity 40%) in 100 mL of deionized water, slowly add it dropwise to a three-necked flask with stirring at 60 °C, and re...

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 paocyanine (silica concentration 28.22%) in 50 mL of deionized water, slowly add it to the 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) ferrous sulfate heptahydrate (purity 99%) in 150 mL of deionized water, slowly add it to 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) sodium dimethyldithiocarbamate (purity 40%) in 50 mL of deionized water, slowly add it to the three-necked flask with stirring at 60 °C, and react at 60 °C for 1 h to obtain the reacti...

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Abstract

The invention belongs to the technical field of soil heavy metal pollution treatment, and particularly relates to preparation and application of a surface-modified silicon dioxide-doped ferrous sulfide soil heavy metal passivator. The preparation method of the heavy metal passivator comprises the following steps: dissolving a sulfide in a sodium hydroxide aqueous solution, adding a sodium silicate aqueous solution under a stirring condition, uniformly mixing to prepare an alkali solution, then adding a ferrous salt aqueous solution, reacting ferrous salt with the metal sulfide to generate ferrous sulfide while sodium silicate generates nano silicon dioxide particles, and then adding an organic modifier to obtain a finished product. The passivator has a good passivation effect on various heavy metals such as Cu, Pb, Cd and As, can be directly added into soil to passivate the heavy metals, not only has a good passivation and remediation function, but also can be used for remediation of the heavy metal contaminated soil due to the fact that absorption of plants to silicon can be obviously improved due to the effect of nano silicon dioxide, and a certain soil ecological restoration effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and in particular relates to a surface modified ferrous sulfide soil heavy metal passivator doped with silica, 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 heavy metal pollution has become increasingly serious. The accumulation of heavy metals in plants, animals and microorganisms can cause serious poisoning to them, and can endanger human beings through the food chain. Among many remediation materials, heavy metal adsorption and passivation materials can be directly added to the soil to reduce the mobility of heavy metals to achieve passivation and remediation of heavy metals in soil. It has the advantages of fast adsorption speed, relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(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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