Preparation method and application of repair material for heavy metal cadmium polluted soil

A technology for cadmium-contaminated soil and repair materials, applied in the restoration of contaminated soil, soil conditioning materials, applications, etc., can solve the problems of reduced in-situ repair effect of nano-ferrous phosphate, affecting soil fertility, and easy reunion. Achieve the effects of recycling, significant social and economic benefits, and increased production

Active Publication Date: 2016-06-15
师大清远环境修复科技有限公司
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Problems solved by technology

However, due to the nano-size effect of nano-materials, they are easy to agglomerate, resulting in the reduction of the in-situ repair effect of nano-ferrous phosphate; at the same time, due to the nano-reactivity and the precipitation of iron ions during the repair process, the excessive iron content in the soil will affect the soil. Fertility

Method used

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  • Preparation method and application of repair material for heavy metal cadmium polluted soil
  • Preparation method and application of repair material for heavy metal cadmium polluted soil
  • Preparation method and application of repair material for heavy metal cadmium polluted soil

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preparation example Construction

[0034] A preparation method for heavy metal cadmium contaminated soil remediation material, comprising the following steps:

[0035] 1) dissolving the cellulose ether in water, removing oxygen to obtain a cellulose ether solution;

[0036] 2) Add biochar particles in anaerobic state and stir evenly;

[0037] 3) Add ferrous salt solution under anaerobic state, and stir evenly;

[0038] 4) Add sodium phosphate solution dropwise while stirring in anaerobic state, and stir thoroughly after the dropwise addition to obtain a cellulose ether-stabilized loaded nano-ferrous phosphate suspension, which is a heavy metal cadmium-contaminated soil remediation material.

[0039] Preferably, a kind of preparation method of heavy metal cadmium contaminated soil remediation material comprises the following steps:

[0040] 1) dissolving carboxymethyl cellulose in water, and performing deoxygenation treatment to obtain a cellulose ether solution;

[0041] 2) Add biochar particles in anaerobic...

Embodiment 1

[0064] Preparation of biochar:

[0065] 1) Drying: Cut the collected Chinese medicine dregs into pieces and dry them at 105°C.

[0066] 2) Pyrolysis: Put the weighed traditional Chinese medicine dregs into a crucible and place them in a muffle furnace. Under nitrogen, heat up to 600°C at a heating rate of 20°C / min, carbonize at a constant temperature for 2 hours, and then cool to room temperature , take it out, grind it, pass through a 24-120 mesh sieve, and keep it sealed. figure 1 SEM image of the prepared biochar.

[0067] Depend on figure 1 It can be seen that biochar has a rich pore structure.

Embodiment 2

[0069] Preparation of Nano Ferrous Phosphate Suspension:

[0070] 1) Dissolve 0.1307g of ferrous sulfate heptahydrate in 25mL of deoxygenated water to prepare ferrous sulfate solution;

[0071] 2) Dissolve 0.1178g of sodium phosphate dodecahydrate in 25mL of deoxygenated water to obtain a sodium phosphate solution;

[0072] 3) Under anaerobic conditions, add the sodium phosphate solution dropwise to the ferrous sulfate solution while stirring to obtain a nano-ferrous phosphate suspension.

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Abstract

The invention discloses a preparation method and application of a repair material for heavy metal cadmium polluted soil. The preparation method of the repair material comprises the following steps: (1) dissolving cellulose ether into water, and carrying out deoxidizing, so as to obtain a cellulose ether solution; (2) adding charcoal particles in absence of oxygen, and uniformly stirring; (3) adding a ferrous salt solution in absence of oxygen, and uniformly stirring; and (4) dropwise adding a sodium phosphate solution while stirring in absence of oxygen, and adequately stirring after the dropwise adding, so as to obtain cellulose ether stabilized supported nano-ferrous phosphate suspension liquid, namely the repair material for the heavy metal cadmium polluted soil. The repair material can be applied to the in-situ repair of the heavy metal cadmium polluted soil, is very small in solubility product, can be prepared for use in site and is convenient to implement, the secondary pollution is avoided, the preparation method is simple, the cost is low, the nutrients and moisture in soil are beneficially maintained, and the yield of crops is beneficially increased.

Description

technical field [0001] The invention relates to the preparation and application of a heavy metal cadmium-contaminated soil restoration material, and belongs to the technical field of environmental pollution control and restoration. Background technique [0002] Since Cadmium (Cd) was discovered in Germany in 1817, it has been widely used in pigments, plastics, electronics, metallurgy, electroplating and many other aspects, bringing great wealth to human production and life. With the rapid growth of Cd usage and the lack of awareness of it, a series of Cd-related pollution incidents have occurred around the world, the most well-known of which is the "Ititai disease" major public nuisance incident in Toyama Prefecture, Japan in the middle of the 20th century . According to reports, the area of ​​cadmium-contaminated cultivated land in my country is 13,300 hectares, and the cadmium content in the soil of eleven sewage irrigation areas has reached the level of "cadmium rice" pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 方战强许研哲
Owner 师大清远环境修复科技有限公司
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