Soil lead pollution passivating agent

A technology of lead pollution and passivating agent, applied in the field of soil lead pollution passivating agent and woody peat-loaded nano-iron, can solve the problems of undisclosed lead pollution, etc., and achieve the advantages of repairing lead pollution, reducing synthesis cost and improving product quality. Effect

Inactive Publication Date: 2019-06-14
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art has not yet disclosed the preparation of woody peat-lo

Method used

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  • Soil lead pollution passivating agent
  • Soil lead pollution passivating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Tobacco leaf treatment: After the tobacco leaves that have been washed out of impurities are naturally dried, they are dried at 50°C and crushed through a 200-mesh sieve;

[0026] (2) Preparation of tobacco leaf extract: Weigh 1.0 g of the tobacco leaf powder obtained in the above step (1) in a 250 mL conical flask, add 25 mL of 50% ethanol solution (volume ratio) for ultrasonic extraction for 30 min, and after centrifugation, clear the liquid by rotating Concentrate to 10mL with an evaporator below 38°C;

[0027] (3) Adsorption of ferrous salt by woody peat: Weigh 0.050g of woody peat into a 100mL beaker, add 3.0mL16.5g L -1 FeSO 4 ·7H 2 O solution, placed in a 25°C water bath at 200r·min -1 Stir at 5000r·min for 30min -1 Centrifuge at a rotating speed for 10 minutes to obtain woody peat adsorbed with ferrous salts;

[0028] (4) Preparation of nano-iron: under continuous stirring or shaking conditions, add the tobacco leaf extract obtained in step (2) to the w...

Embodiment 2

[0030] Tobacco leaf treatment, preparation of tobacco leaf extract, woody peat adsorption of ferrous salt and preparation of nano-iron are the same as in Example 1, except that the weight of woody peat in step (3) is 0.020 g.

Embodiment 3

[0032] Tobacco leaf treatment, preparation of tobacco leaf extract, woody peat adsorption of ferrous salt and preparation of nano-iron are the same as in Example 1, except that the weight of woody peat in step (3) is 0.100 g.

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Abstract

The invention provides a soil lead pollution passivating agent, and particularly provides wood peat carried nano iron prepared from a waste tobacco leaf extract. By uniformly mixing the soil lead pollution passivating agent and soil, the transformation of lead in soil into a residual state can be promoted, and the aim of lowering the bioavailability of the lead in soil is fulfilled. The preparation of the wood peat carried nano iron does not need any toxic reagent, and can be finished with conventional instruments at room temperature and under normal pressure, so that resource utilization of tobacco leaves can be realized, and the preparation cost of the nano iron is lowered. The soil lead pollution passivating agent is environmentally friendly, can increase the organic matter content of soil while restoring soil lead pollution, improves the yield of crops, and belongs to the technical field of heavy metal pollution remediation.

Description

technical field [0001] The invention provides a passivator for soil lead pollution, specifically a woody peat-loaded nano-iron prepared by using waste tobacco leaf extracts. Mixing it with the soil can promote the transformation of lead in the soil into a residue state, and achieve the purpose of reducing the bioavailability of lead in the soil. The invention belongs to the technical field of heavy metal pollution remediation. Background technique [0002] Soil lead pollution will lead to a decline in photosynthesis of plants, resulting in reduced crop yields, lead-contaminated food enriched through the food chain, and eventually lead to excessive blood lead in the human body, resulting in disorders of the physiological functions of the human digestive system, respiratory system, and reproductive system. Applying soil heavy metal passivation agent to reduce the mobility and bioavailability of soil heavy metals by changing the occurrence form of soil heavy metals is one of t...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00
Inventor 肖苗石国荣候懿轩席改红吴岳庭颜洁
Owner HUNAN AGRICULTURAL UNIV
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