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Soil mercury pollution composite modified restoration agent and production method

A technology of composite modification and production method, applied in the field of soil remediation, can solve the problems of few mercury-contaminated soil remediation technologies and unsatisfactory effects, and achieve the effect of improving adsorption capacity, facilitating promotion and use, and being easy for society to accept

Inactive Publication Date: 2019-05-21
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the remediation of heavy metals in soil has achieved certain results, but there are few remediation technologies for mercury-contaminated soil in rice fields in mercury mining areas, and the effect is not ideal

Method used

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  • Soil mercury pollution composite modified restoration agent and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1. A soil mercury pollution composite modified restoration agent, the preparation method of the composite modified restoration agent comprises the following steps:

[0031] A, adding chitosan 1.3kg to 100kg mass fraction is in the 1% acetic acid solution, stirs, then slowly add sodium selenite 1kg, with the mass fraction is 5% nitric acid solution to adjust the pH value of the solution to 3.6, stir, Take the solid after centrifugation; repeatedly wash the solid with absolute ethanol, take the solid twice after centrifugation, and dry it at a low temperature at 100°C to obtain the selenized chitosan product A;

[0032] b. Heating the montmorillonite to 250°C for 2 hours, and obtaining product B after cooling;

[0033] c. Add 1 kg of product A into 100 kg of acetic acid solution with a mass fraction of 1%, after stirring, add 100 kg of product B, heat to 40°C and keep stirring for 2 hours, and take the solid after centrifugation to obtain product C;

[0034] d. ...

Embodiment 2

[0035] Example 2. A soil mercury pollution composite modified restoration agent, the preparation method of the composite modified restoration agent comprises the following steps:

[0036] A, chitosan 2kg is added 150kg mass fraction and be in the acetic acid solution of 5%, stir, then slowly add sodium selenite 1.5kg, be that the nitric acid solution of 5% mass fraction regulates the solution pH value to 3.9, stir, Take the solid after centrifugation; repeatedly wash the solid with absolute ethanol, take the solid three times after centrifugation, and dry it at a low temperature at 105°C to obtain the selenized chitosan A product;

[0037] b. Heating the montmorillonite to 300°C for 2.5 hours and cooling to obtain product B;

[0038] c. Add 1.5kg of product A into 150kg of 5% acetic acid solution by mass fraction, after stirring, add 110kg of product B, heat to 50°C and keep stirring for 2.5h, and take the solid after centrifugation to obtain product C;

[0039] d. After dry...

Embodiment 3

[0040] Example 3. A soil mercury pollution composite modified restoration agent, the preparation method of the composite modified restoration agent comprises the following steps:

[0041]A, adding chitosan 2.7kg to 200kg mass fraction is in the 10% acetic acid solution, stirs, then slowly add sodium selenite 2kg, with the mass fraction is 15% nitric acid solution to adjust the solution pH value to 4.1, stir, Take the solid after centrifugation; repeatedly wash the solid with absolute ethanol, take the solid 4 times after centrifugation, and dry it at a low temperature at 110°C to obtain the selenized chitosan product A;

[0042] b. Heating the montmorillonite to 350°C for 3 hours, and obtaining product B after cooling;

[0043] c. Add 2 kg of product A into 200 kg of acetic acid solution with a mass fraction of 10%, after stirring, add 120 kg of product B, heat to 60°C and keep stirring for 3 hours, and take the solid after centrifugation to obtain product C;

[0044] d. Aft...

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Abstract

The invention discloses a soil mercury pollution composite modified restoration agent and a production method. The composite modified restoration agent is a selenium modified restoration agent obtained by modifying montmorillonite with selenium chitosan; the composite modified restoration agent is prepared from the following raw materials in parts by weight: 1 to 2 parts of selenium chitosan and 100 to 120 parts of montmorillonite; and the selenium chitosan is prepared from the following raw materials in parts by weight: 1 to 2 parts of sodium selenite and 1.3 to 2.7 parts of chitosan. The restoration agent with an efficient and stable restoration rate, which is disclosed by the invention, has the benefits that concentration of mercury in rice is effectively reduced; the raw materials arecheap; a process method is simple; absorption performance is effectively improved, and the soil mercury pollution composite modified restoration agent is easy to implement and safe to use, cannot generate secondary pollution, is easy to be accepted by the society and facilitates popularization and use.

Description

technical field [0001] The invention relates to a soil mercury pollution composite modified restoration agent and a preparation method thereof, which belong to the technical field of soil restoration. Background technique [0002] Mercury pollution in paddy field soil refers to the phenomenon that the content of heavy metal mercury in paddy field soil is significantly higher than the natural background value, which causes the environmental quality of paddy fields to deteriorate, the quality of agricultural products to decline, and the abundance of mercury to exceed national food safety standards. Mercury pollution in paddy field soil threatens the ecological environment. It has the characteristics of concealment and lag, irreversibility and long-term, regional and serious, irreversible and long-term, difficult and long-term governance. Since mercury can enter all ecosystems, it poses a huge potential threat to the ecosystem, and it can also enter the human body through the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/48C09K101/00
Inventor 何天容王祖波姚璁冉澍许议元韩怡新
Owner GUIZHOU UNIV