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Preparation method of soil heavy metal repairing agent

A technology for heavy metals and remediation agents, applied in the field of soil remediation, can solve the problems of heavy metal re-contamination and poor solidification effect, and achieve the effects of not easy to run off and avoiding heavy metal pollution.

Pending Publication Date: 2021-12-14
ANHUI SIERTE FERTILIZER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing repair agents have poor curing effect, and heavy metals may be leached again under long-term and harsh environments, resulting in re-contamination of heavy metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of soil heavy metal remediation agent, comprising:

[0023] Preparation of nano-silica: Pretreat the biomass ash of the power plant to remove impurities and scum; soak the pretreated biomass ash of the power plant in acid solution, filter, separate and dry it, and then place it in alkali solution Boil, filter, and separate to obtain water glass; put the water glass in a reaction kettle, raise the temperature of the reaction kettle to 60°C, pass in carbon dioxide gas to stir and react for 10 minutes, then raise the temperature to 90°C, continue to pass in carbon dioxide gas to stir and react 50min, the obtained slurry was filtered, washed, and purified to obtain nano-silica;

[0024] Mercapto-modified nano-silica: disperse the nano-silica prepared above in ethanol, adjust the pH to 7, add mercaptopropyltrimethoxysilane to the ethanol dispersed with nano-silica, and react at 50°C 2h, cooled to room temperature, filtered, washed, and dried to obtain m...

Embodiment 2

[0027] A preparation method of soil heavy metal remediation agent, comprising:

[0028] Preparation of nano-silica: Pretreat the biomass ash of the power plant to remove impurities and scum; soak the pretreated biomass ash of the power plant in acid solution, filter, separate and dry it, and then place it in alkali solution Boil, filter, and separate to obtain water glass; put the water glass in a reactor, raise the temperature of the reactor to 70°C, feed in carbon dioxide gas and stir for 30 minutes, then raise the temperature to 85°C, and continue to feed in carbon dioxide gas to stir After reacting for 40 minutes, the obtained slurry was filtered, washed, and purified to obtain nano-silica;

[0029] Mercapto-modified nano-silica: disperse the nano-silica prepared above in ethanol, adjust the pH to 8, add mercaptopropyltrimethoxysilane to the ethanol dispersed with nano-silica, and react at 60°C 1.5h, cooled to room temperature, filtered, washed, and dried to obtain mercap...

Embodiment 3

[0032] A preparation method of soil heavy metal remediation agent, comprising:

[0033] Preparation of nano-silica: Pretreat the biomass ash of the power plant to remove impurities and scum; soak the pretreated biomass ash of the power plant in acid solution, filter, separate and dry it, and then place it in alkali solution Boil, filter, and separate to obtain water glass; put the water glass in a reactor, raise the temperature of the reactor to 70°C, feed in carbon dioxide gas and stir for 15 minutes, then raise the temperature to 90°C, and continue to feed in carbon dioxide gas to stir After reacting for 30 minutes, the obtained slurry was filtered, washed, and purified to obtain nano-silica;

[0034] Mercapto-modified nano-silica: disperse the nano-silica prepared above in ethanol, adjust the pH to 9, add mercaptopropyltrimethoxysilane to the ethanol dispersed with nano-silica, and react at 65°C 1h, cooled to room temperature, filtered, washed, and dried to obtain mercapto...

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Abstract

The invention discloses a preparation method of a soil heavy metal repairing agent. The preparation method comprises the following steps: S1, modifying nano silicon dioxide by using a sulfhydrylation reagent to obtain sulfydryl modified nano silicon dioxide; and S2, grafting tannic acid by taking the sulfydryl modified nano silicon dioxide as a carrier to obtain the soil heavy metal repairing agent. The soil heavy metal repairing agent can be used for repairing soil polluted by heavy metals such as Cd<2+>, Pb<2+> and Hg<2+>; and the soil heavy metal repairing agent is firmly combined with heavy metal in soil, and soil re-pollution caused by re-leaching of the heavy metal is avoided.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a preparation method of a soil heavy metal remediation agent. Background technique [0002] Heavy metal refers to the density of 5g / cm 3 The above metal elements, with the rapid development of the economy, pollutants containing heavy metals enter the soil through various channels, causing serious soil pollution. disease, endangering human health. For example, excessive cadmium can lead to kidney damage, osteoporosis and other diseases; excessive lead can damage the blood, central nervous system, reproductive system and other human organs and circulatory system. In my country, about 150 million mu of arable land is polluted by heavy metals, which leads to a reduction in grain production of more than 10 million tons per year, and more than 10 million tons of "poisonous" grains produced with heavy metals exceeding the standard each year. Therefore, the treatm...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C07H1/00C07H13/08C01B33/18
CPCC09K17/40B09C1/08C07H1/00C07H13/08C01B33/18C07B2200/11
Inventor 陈俊阳宫能领向泽文董惠魏素君
Owner ANHUI SIERTE FERTILIZER IND
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