Soil heavy metal passivator and preparation method thereof

A heavy metal passivator and passivator technology, applied in chemical instruments and methods, soil conditioning materials, agriculture, etc., can solve the problem of unsatisfactory Cd passivation effect, polluted surface water and groundwater, and poor passivation effect of cadmium and other problems, to achieve the effect of novel technology, good effect and improving passivation rate

Inactive Publication Date: 2014-08-13
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the passivation effect of heavy metals in soil has achieved certain results, the large-scale use of passivators has potential risks such as destroying soil structure, secondary release of heavy metals, and polluting surface water and groundwater. The passivation effect of Cd is not ideal
In order to overcome the disadvantages of poor passivation effect on cadmium and environmental risks of the existing passivators, the patent of the present invention provides a mercaptolated humin passivator, which can effectively passivate cadmium in polluted soil with good effect

Method used

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  • Soil heavy metal passivator and preparation method thereof
  • Soil heavy metal passivator and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a soil heavy metal deactivator, comprising the steps of:

[0030] (1) Peat soil pretreatment: air-dry the peat soil, pass through an 8-mesh nylon sieve to remove coarse fibers in the peat soil;

[0031] (2) Humin extraction: Weigh an appropriate amount of pretreated peat soil, mix it with a sodium hydroxide solution with a concentration of 0.1mol / L in a container, add 10ml of sodium hydroxide for every 1g of peat soil, and make the peat soil It was suspended in the solution and placed on a shaker for 6 hours; left to stand and centrifuged, the supernatant was taken out, and washed repeatedly with distilled water until the supernatant was light yellow; air-dried to obtain crude humin (HM );

[0032] (3) Humin thiolation: mix thioglycolic acid, acetic anhydride, and acetic acid (36%) in a volume ratio of 5:3:2, add 2 to 3 drops of concentrated sulfuric acid solution with a volume fraction of 0.1% and a mass percentage of 3% crude Humin, stir and ...

Embodiment 2

[0035] A preparation method of a soil heavy metal deactivator, comprising the steps of:

[0036] (1) Peat soil pretreatment: air-dry the peat soil, pass through an 8-mesh nylon sieve to remove coarse fibers in the peat soil;

[0037] (2) Humin extraction: Weigh an appropriate amount of pretreated peat soil, mix it with a sodium hydroxide solution with a concentration of 0.1mol / L in a container, add 10ml of sodium hydroxide for every 1g of peat soil, and make the peat soil It was suspended in the solution and placed on a shaker for 8 hours; left to stand and centrifuged, the supernatant was taken out, and washed repeatedly with distilled water until the supernatant was light yellow; air-dried to obtain crude humin (HM );

[0038] (3) Humin thiolation: mix thioglycolic acid, acetic anhydride, and acetic acid (36%) in a volume ratio of 5:3:2, add 2 to 3 drops of concentrated sulfuric acid solution with a volume fraction of 0.5% and a mass percent of 5% crude Humin, stir and coo...

Embodiment 3

[0041] A preparation method of a soil heavy metal deactivator, comprising the steps of:

[0042] (1) Peat soil pretreatment: air-dry the peat soil, pass through an 8-mesh nylon sieve to remove coarse fibers in the peat soil;

[0043] (2) Humin extraction: Weigh an appropriate amount of pretreated peat soil, mix it with a sodium hydroxide solution with a concentration of 0.1mol / L in a container, add 10ml of sodium hydroxide for every 1g of peat soil, and make the peat soil It was suspended in the solution, and placed on a shaker for 7 hours; left to stand and centrifuged, the supernatant was taken out, and washed repeatedly with distilled water until the supernatant was light yellow; air-dried to obtain crude humin (HM );

[0044] (3) Humin thiolation: Mix thioglycolic acid, acetic anhydride, and acetic acid (36%) in a volume ratio of 5:3:2, add 2 to 3 drops of concentrated sulfuric acid solution with a volume fraction of 0.3% and 4% crude humin, and stir Cool to room tempera...

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Abstract

The invention relates to a soil heavy metal passivator and a preparation method thereof and belongs to the technical field of soil improvement. The soil heavy metal passivator comprises humin and sulfhydrylation humin; the preparation method of the soil heavy metal passivator comprises that humin is extracted from peat soil and subjected to sulfhydrylation for obtaining the sulfhydrylation humin, and the preparation method of the soil heavy metal passivator comprises three concrete steps of pre-treating the peat soil, extracting humin and carrying out sulfhydrylation on the humin, namely carrying out air drying on the peat soil, sieving, weighing defined amount of the peat soil and mixing with sodium hydroxide solution, placing mixture on a shaking table and vibrating, standing, centrifuging and separating, washing, and carrying out air drying, so that crude humin (HM) is obtained; adding a mixed solution of mercaptoacetic acid, acetic anhydride and acetic acid, a concentrated sulphuric acid solution and the crude humin in proportion, stirring, cooling, carrying out reaction in a water bath, washing, and carrying out air drying, so that the sulfhydrylated humin is obtained. The preparation method of the soil heavy metal passivator is simple, a technology is novel; the prepared soil heavy metal passivator can increase passivation rate of Cd in polluted soil and also can be intensively combined with soil particles, migration of the passivator is reduced, and the soil heavy metal passivator is energy-saving and environmentally friendly and is applicable to large-scale popularization.

Description

technical field [0001] The invention relates to a soil heavy metal passivator and a preparation method thereof, in particular to a preparation method for extracting humin from peat soil and mercaptoizing humin to obtain mercaptohumin, which belongs to the technical field of soil improvement. Background technique [0002] Soil is an important part of the ecological environment system and the material basis for human survival and development. Soil heavy metal pollution has become a global environmental problem. Because of its hidden, irreversible and long-term characteristics, it poses a huge potential threat to the ecosystem and affects the health of humans and animals through the food chain. At the same time, heavy metal pollution can lead to the degradation of soil fertility, the reduction of agricultural product yield and the decline of crop quality, which seriously affects the environmental quality and sustainable economic development. The severity of heavy metal pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32C08H99/00
Inventor 刘国光李丽明姚琨丁玲吕文英林亲铁
Owner GUANGDONG UNIV OF TECH
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