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Cadmium pollution repairing agent

A remediation agent, cadmium pollution technology, applied in the restoration of polluted soil, water pollutants, adsorbed water/sewage treatment and other directions, to achieve the effect of improving removal speed, realizing resource utilization, and repairing cadmium pollution

Inactive Publication Date: 2019-06-21
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 method of using waste tobacco leaf extract as a reducing agent to prepare woody peat-loaded nano-iron and its use for removing cadmium ion pollution in water and passivating and remediating cadmium pollution in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (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;

[0033] (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;

[0034] (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 Stirring at 30min at 3000r·min -1 Centrifuge at a rotating speed for 10 minutes to obtain woody peat adsorbed with ferrous salts;

[0035] (4) Preparation of nano-iron: under continuous stirring or shaking conditions, add the tobacco leaf extract obtained in step (2) to the ...

Embodiment 2

[0037] 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

[0039] 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 cadmium pollution repairing agent. Specifically, a waste tobacco leaf extract is used as a reducing agent and a stabilizer to perform in situ reduction on ferrite or iron saltadsorbed by woody peat, and woody peat-loaded nano-iron is obtained. The reaction activity of the nano-iron is controlled by adjusting the mass ratio of woody peat to the ferrite or iron salt, and / orby adjusting the amount of the tobacco leaf extract, and / or by adjusting the reaction time, and / or by adjusting the stirring or shaking speed. The preparation of the woody peat-loaded nano-iron doesnot need toxic reagents, and can be completed by using conventional instruments at room temperature and normal pressure. Therefore, recycling of tobacco leaves can be realized; the preparation cost ofthe nano-iron is reduced; the cadmium pollution repairing agent is environmentally friendly, and can repair the cadmium pollution in soil, increase the content of organic matters in the soil and improve the output and the quality of crops. The cadmium pollution repairing agent can be widely applied to removing cadmium ion pollution in water and repairing the cadmium pollution in the soil throughpassivation, and belongs to the technical field of heavy metal pollution repairing.

Description

technical field [0001] The invention provides a cadmium pollution remediation agent, specifically a woody peat-loaded nano-iron capable of removing cadmium ion pollution in water bodies and passivating and repairing cadmium-contaminated soil, belonging to the technical field of heavy metal pollution remediation. Background technique [0002] Cadmium is widely used in industries such as pigments, electroplating and battery manufacturing. Cadmium is extremely toxic and will cause a large loss of calcium in human bones, causing osteoporosis, bone atrophy and joint pain, which is the so-called "itai disease". In addition, cadmium also has certain damages to the kidneys, lungs, cardiovascular and nervous systems. For this reason, the United Nations Environment Program lists cadmium as one of the primary toxic metals, and the control of cadmium pollution cannot be ignored. It is one of the effective ways to control heavy metal pollution by changing the occurrence form of heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28B09C1/00C02F101/20
Inventor 石国荣席改红肖苗李小雨候懿轩吴岳庭
Owner HUNAN AGRICULTURAL UNIV
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