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Preparation method of nano Ni/Fe-biochar composite material and application of nano Ni/Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil

A polybrominated diphenyl ether and composite material technology, applied in the field of environmental pollution control and restoration, can solve the problems of reduced specific surface area and degradation efficiency, easy agglomeration and oxidation, affecting soil fertility, etc., and achieves simple preparation method, short restoration time, Beneficial for recycling

Active Publication Date: 2016-06-15
师大清远环境修复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanometer zero-valent iron has been successfully applied to the removal of a variety of refractory organic halides, antibiotics, nitrate nitrogen, and heavy metals, it is easy to agglomerate and oxidize due to the interface effect and small size effect, which leads to Decrease in specific surface area and degradation efficiency
At the same time, the iron ions released by zero-valent iron during the restoration process may lead to excessive iron content in the soil, which will affect soil fertility.

Method used

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  • Preparation method of nano Ni/Fe-biochar composite material and application of nano Ni/Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil
  • Preparation method of nano Ni/Fe-biochar composite material and application of nano Ni/Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil
  • Preparation method of nano Ni/Fe-biochar composite material and application of nano Ni/Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil

Examples

Experimental program
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preparation example Construction

[0035] A preparation method of nano-Ni / Fe-biochar composite material includes the following preparation methods:

[0036] 1) Dissolve the iron salt or ferrous salt and polyvinylpyrrolidone in the ethanol aqueous solution, mix well, then add the biochar particles, stir and mix well to obtain solution A;

[0037] 2) Add the ethanol aqueous solution containing the reducing agent to the solution A, after the stirring reaction is complete, the reaction product is separated, washed and added to the ethanol aqueous solution to obtain the solution B;

[0038] 3) Add the nickel salt-containing ethanol aqueous solution dropwise to the solution B, after the stirring reaction is completed, the product material is separated, and the nano-Ni / Fe-biochar composite material is obtained after washing and drying.

[0039] Preferably, the ethanol aqueous solution is a deoxygenated ethanol aqueous solution.

[0040] Preferably, the concentration of ethanol in the ethanol aqueous solution is 20-50% v / v.

[00...

Embodiment 1

[0062] Example 1 Preparation method of nano bimetallic nickel-iron solid particles

[0063] (1) Dissolve the ferrous salt and polyvinylpyrrolidone in the deoxygenated ethanol aqueous solution, stir and mix.

[0064] (2) Add sodium borohydride dropwise to the solution described in (1) under stirring conditions to prepare a nano-zero-valent iron solution and wash.

[0065] (3) Add ethanol solution to disperse nano-zero-valent iron. At the same time, a certain amount of nickel salt ethanol aqueous solution was added and shaken for 30 minutes. Allow Ni to be deposited on the iron surface to prepare nano bimetallic Ni / Fe particles.

[0066] figure 1 SEM image of the nano bimetallic Ni / Fe prepared in Example 1. figure 1 It can be seen that the single nano nickel-iron bimetallic particles have serious agglomeration.

Embodiment 2

[0067] Example 2 Preparation method of biochar

[0068] (1) Drying: After cutting the collected bagasse into small pieces, it is dried at 105°C.

[0069] (2) Pyrolysis: Put the weighed bagasse into a crucible and put it in a muffle furnace. Under nitrogen, set the final temperature to 600℃, and then continue to carbonize after heating up to this temperature range at 20℃ / min 2h. After the muffle furnace is cooled to room temperature, take it out, and after grinding, pass through a 60-120 mesh sieve and keep it sealed.

[0070] figure 2 SEM image of the biochar prepared in Example 2. by figure 2 It can be seen that the biochar prepared in this example has a rich pore structure.

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Abstract

The invention discloses a preparation method of a nano Ni / Fe-biochar composite material and application of the nano Ni / Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil. The preparation method comprises the following steps: dissolving iron salt or ferrous salt and polyvinylpyrrolidone in an ethanol water solution, uniformly mixing, adding biochar particles, and uniformly mixing to obtain a solution A; adding a reducer-containing ethanol water solution into the solution A, stirring to react completely, separating out the reaction product, washing, and adding into an ethanol water solution to obtain a solution B; and dropwisely adding a nickel-salt-containing ethanol water solution into the solution B, stirring to react completely, separating out the product material, washing, and drying to obtain the nano Ni / Fe-biochar composite material. The nano Ni / Fe bimetal particles are carried on the biochar, thereby further enhancing the flowability of the nanoparticles. The nano Ni / Fe-biochar composite material is beneficial to soil in-situ restoration due to the stability and dispersity. The nano Ni / Fe-biochar composite material can be used for restoring high-concentration PBDEs polluted soil, and has high restoration efficiency.

Description

Technical field [0001] The invention belongs to the technical field of environmental pollution treatment and restoration, and in particular relates to a preparation method and application of a multi-diphenyl ether contaminated soil in-situ restoration material. Background technique [0002] Polybrominated diphenylethers (PBDEs) are a type of typical brominated flame retardants. Because of their excellent flame retardant properties, they are widely used in textiles, electronics, electrical appliances, circuit boards, petroleum, mining, building materials, paints, etc. Industrial products and household products. Unlike other brominated flame retardants that are combined with products through chemical bonds, PBDEs are simply mixed into products, so they are more likely to be released from the product to the environment during production, use, and disposal. The movement of the atmosphere and water bodies causes widespread pollution. Polybrominated diphenylethers (PBDEs), as a kind ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/04B22F9/24B82Y40/00B82Y20/00B09C1/08C09K101/00
CPCB09C1/08B22F9/24B82Y20/00B82Y40/00C09K17/04C09K2101/00
Inventor 方战强吴娟
Owner 师大清远环境修复科技有限公司
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