Preparation method and application of cadmium-arsenic composite pollution repairing agent based on natural macromolecular organic matter

A technology of complex pollution and organic matter, applied in the field of soil remediation, can solve the problems of limiting the passivation effect of heavy metals, and achieve the effects of reducing the effectiveness of heavy metals, promoting adsorption, and increasing negative charges

Active Publication Date: 2019-07-16
湖南重金属污染耕地安全高效利用工程研究中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After investigation and research, it is found that: (1) increasing the soil pH can effectively reduce the activity of cadmium in the soil, but when the reaction is intense, the pH is too high, and the soil pH fluctuates greatly, the arsenic is dissolved and the effectiveness of arsenic is improved; (2) ) Lignin is an amorphous, aromatic polymer containing oxyphenylpropanol or its derivatives in its molecular structure, which widely exists in plants. It also contains a variety of active functional groups, such as hydroxyl, carbonyl , carboxyl, methyl and side chain structures, which can selectively adsorb and complex heavy metal ions, but lignin is generally insoluble in water and soluble in alkaline solutions, which limits its passivation effect on heavy metals; (3) lignin passes through Metal ion complexation forms insoluble lignin metal salt, which can make it have better chemical activity, obtain better adsorption effect and adsorption selectivity of heavy metals

Method used

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  • Preparation method and application of cadmium-arsenic composite pollution repairing agent based on natural macromolecular organic matter
  • Preparation method and application of cadmium-arsenic composite pollution repairing agent based on natural macromolecular organic matter
  • Preparation method and application of cadmium-arsenic composite pollution repairing agent based on natural macromolecular organic matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 cadmium arsenic composite pollution remediation agent

[0025] (1) Straw pretreatment

[0026] The straw was crushed and passed through a 100-mesh sieve, and the sieved straw was added to the alkali solution with a concentration of 5% at a mass ratio of 1:10, stirred evenly, and heated at 100°C for 10 minutes to obtain a mixture A.

[0027] (2) Add metal ions

[0028] Fe was added to mixture A in an amount of 1.25 mol / L 3+ , then add Ca at a molar ratio of 1:1 2+ , Mg 2+ The mixture makes the water-soluble macromolecular organic matter and OH in the mixture A - Precipitate, filter to take the filter residue, wash until the pH is constant, dry and pulverize to obtain the mixture B.

[0029] (3) Compounding

[0030] Mix calcium carbonate, wollastonite, and mixture B at a ratio of 40:30:30, and mix evenly to obtain a cadmium-arsenic composite pollution restoration agent.

Embodiment 2

[0031] Embodiment 2 cadmium arsenic composite pollution remediation agent

[0032] (1) Straw pretreatment

[0033] The straw was crushed and passed through a 100-mesh sieve, and the sieved straw was added to the alkali solution with a concentration of 1% at a mass ratio of 1:10, stirred evenly, and heated at 100°C for 10 minutes to obtain a mixture A.

[0034] (2) Add metal ions

[0035]Fe was added to mixture A in an amount of 0.25 mol / L 3+ , then add Ca at a molar ratio of 1:1 2+ , Mg 2+ The mixture makes the water-soluble macromolecular organic matter and OH in the mixture A - Precipitate, filter to take the filter residue, wash until the pH is constant, dry and pulverize to obtain the mixture B.

[0036] (3) Compounding

[0037] Mix calcium carbonate, wollastonite, and mixture B at a ratio of 40:30:30, and mix evenly to obtain a cadmium-arsenic composite pollution restoration agent.

Embodiment 3

[0038] Embodiment 3 cadmium arsenic composite pollution remediation agent

[0039] (1) Straw pretreatment

[0040] The straw was crushed and passed through a 100-mesh sieve, and the sieved straw was added to the alkali solution with a concentration of 1% at a mass ratio of 1:10, stirred evenly, and heated at 100°C for 10 minutes to obtain a mixture A.

[0041] (2) Add metal ions

[0042] Fe was added to mixture A in an amount of 1.25 mol / L 3+ , then add Ca at a molar ratio of 1:1 2+ , Mg 2+ The mixture makes the water-soluble macromolecular organic matter and OH in the mixture A - Precipitate, filter to take the filter residue, wash until the pH is constant, dry and pulverize to obtain the mixture B.

[0043] (3) Compounding

[0044] Mix calcium carbonate, wollastonite, and mixture B at a ratio of 45:45:10, and mix well to obtain a cadmium-arsenic composite pollution restoration agent.

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Abstract

The invention provides a cadmium-arsenic compound pollution repairing agent based on a natural macromolecular organic matter. A preparation method of the repairing agent comprises the following steps:(1) pretreating straws to obtain a mixture A; (2) adding metal ions to the mixture A to make the water-soluble macromolecular organic matter and OH- precipitate, performing filtration to obtain a filter residue, and performing washing, filtration, drying and crushing to obtain a mixture B; and (3) compounding calcium carbonate, wollastonite, and the mixture B to obtain the cadmium-arsenic composite pollution repairing agent. The cadmium-arsenic composite pollution repairing agent can effectively reduce the activity of cadmium and affect the dissolution of arsenic; and the effect of adsorbingand depressing heavy metals is good, the soil organic matter can be increased, the soil structure is improved, and the plant growth is promoted.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a preparation method and application of a cadmium-arsenic composite pollution remediation agent based on natural macromolecular organic matter. Background technique [0002] Soil acidification is a manifestation of soil degradation. Soil acidification is not only an important reason for the decline of soil fertility, but also an important factor restricting the sustainable development of agricultural production. According to statistics, from the 1980s to the present, my country's soil acidification has become more and more serious, and the acidified land area has expanded to more than 40% of my country's cultivated land area, and often occurs in large areas, especially in southern my country. The soil itself is slightly acidic, and there is more rainfall, which makes the soil acidification more serious. Soil acidification can cause the activation of heavy metals such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00C09K101/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 文亚雄谭石勇郭帅张冬雪
Owner 湖南重金属污染耕地安全高效利用工程研究中心有限公司
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