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Soil heavy metal restoration agent and preparation method thereof

A technology of heavy metals and restorative agents, applied in the field of soil remediation, can solve the problems that the treatment effect cannot be achieved, and the application effect of a single magnetic material is easily affected by soil conditions. Effect

Inactive Publication Date: 2017-12-22
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, biochar and lime have a good effect on the treatment of heavy metal pollution in acidic soil. Iron and manganese oxides can only show a certain treatment effect at a small particle size, and the application effect of a single magnetic material is very easy. affected by soil conditions
Therefore, in the compound polluted natural soil, the single use of any of the above treatment measures cannot achieve a relatively ideal treatment effect.

Method used

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  • Soil heavy metal restoration agent and preparation method thereof
  • Soil heavy metal restoration agent and preparation method thereof
  • Soil heavy metal restoration agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Mix the ground and sieved rice straw with a particle size of 0.25-1 mm and ferric nitrate solution with a concentration of 0.2 mol / L at a ratio of 3:5 (W / V), stir at room temperature for 24 hours, and then continue to soak Add 20% of the mass of rice stalks into the solution, and at the same time, add manganese chloride at a ratio of 1:25 to the mass of the rice stalks, stir intermittently at room temperature, leave it for 24 hours, and drain the soaked rice stalks , dried at 80°C, heated to 550°C at a rate of 25°C per minute under nitrogen-protected anaerobic conditions, and kept for 3 hours, and then continued to cool to room temperature under the condition of isolated air, that is, the iron-manganese-rich oxide Rice straw charcoal with material and calcium.

[0039] (2) Ferric sulfate heptahydrate and water are made into a solution at a ratio of 1:70, and slowly add 1M potassium hydroxide to adjust the pH of the solution to 12. After filtering, dilute the filtrat...

Embodiment 2

[0041] Grind and sieve corn stalks with a particle size of 0.25-1 mm and ferric chloride solution with a concentration of 0.2 mol / L at a ratio of 1:2 (W / V), stir at room temperature for 24 hours, and then continue to add to the soaking solution Add quicklime of 22% of the mass of the rice straw, and at the same time, add manganese sulfate in a ratio of 1:20 to the mass of the rice straw, stir intermittently at room temperature, place it for 24 hours, drain the soaked rice straw, and heat at 80°C Under the condition of anaerobic under the protection of nitrogen, the temperature was raised to 600°C at a rate of 30°C per minute, and kept for 2 hours, and then continued to cool to room temperature under the condition of isolated air, that is, rich in iron manganese oxides and calcium. Elemental Rice Straw Charcoal.

[0042] Make a solution of ferric sulfate heptahydrate and water at a ratio of 1:80, and slowly add 1M KOH to make the pH of the solution 12. After filtering, dilute t...

Embodiment 3

[0044] Mix the ground and sieved wood chips with a particle size of 0.25-1 mm and the ferric nitrate solution with a concentration of 0.2 mol / L at a ratio of 7:10 (W / V), stir at room temperature for 24 hours, and then continue to add rice to the soaking solution 25% quicklime of the straw mass, and at the same time, add potassium permanganate at a ratio of 1:26 to the mass ratio of the rice straw, stir intermittently at room temperature, place it for 24 hours, drain the soaked rice straw, and heat it at 80°C Under the condition of anaerobic under the protection of nitrogen, the temperature was raised to 600°C at a rate of 30°C per minute, and kept for 2 hours, and then continued to cool to room temperature under the condition of isolated air, that is, rich in iron manganese oxides and calcium. Elemental Rice Straw Charcoal.

[0045] Make a solution of ferric sulfate heptahydrate and water at a ratio of 1:60, and slowly add 1M KOH solution to adjust the pH of the solution to 12...

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Abstract

The invention discloses a soil heavy metal restoration agent and a preparation method thereof. Modified biomass charcoal impregnated by calcium-rich element and iron and manganese oxides is adopted as the carrier, and a nanoscale magnetic material is employed to coat the carrier. The product has a particle size of 0.25-5mm, and has a Fe content of 2-5%, a Mn content of 5-10%, and a Ca content of 10-15%. The restoration agent has certain restoration effect on single and compound pollution of cadmium, chromium, arsenic, lead and mercury under different pH backgrounds, thus having certain contribution effect on contaminated soil restoration and food safety. The restoration agent prepared by the method provided by the invention can fully and effectively utilize restoration materials with special passivation effect on heavy metals, and achieves the purpose of spectral restoration of heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the soil restoration technology, and in particular relates to a calcium-, iron-, and manganese-rich multi-element composite biochar soil heavy metal restoration agent coated with magnetic nanomaterials and a preparation method thereof. technical background [0002] As a global pollution problem, heavy metal pollution in soil has attracted the attention of relevant researchers. Heavy metal pollution mainly includes heavy metal pollution such as cadmium, lead, chromium, mercury and arsenic. More and more industrial activities and improper disposal of urban waste have also aggravated the problem of soil heavy metal pollution. Due to the hidden and non-degradable characteristics of soil heavy metal pollution, soil heavy metal pollution has the characteristics of high concentration and variety (Cheng, 2003). However, heavy metals are transported and transported through the food chain, and the toxicity amplification effect in organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K17/04C09K101/00C09K109/00
CPCC09K17/04C09K17/06C09K2101/00C09K2109/00
Inventor 隋凤凤左静李恋卿潘根兴卞荣军张旭辉刘晓雨程琨郑金伟郑聚锋
Owner NANJING AGRICULTURAL UNIVERSITY
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