Manufacturing method and application of poly brominated diphenyl ethers polluted soil in-situ remediation material

An in-situ repair and nano-technology, which is applied in the field of polluted environment remediation, can solve the problems of particle surface active site decline, nano-zero-valent iron easy to agglomerate, application hindrance, etc., and achieve easy promotion and use, convenient operation, and mild reaction conditions. Effect

Active Publication Date: 2013-06-19
SOUTH CHINA NORMAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size effect and surface area effect, nano-zero-valent iron is unstable, easy to agglomerate, and is easy to be oxidized to form passivation layers of goethite (α-FeOOH), lepidocite (γ-FeOOH), and magnetite. (Fe 3 o 4 ), leading to a decrease in the active sites on the particle surface, thus hindering its application
In order to solve the problem of easy agglomeration and instability of nano-zero-valent iron, a modified nano-zero-valent iron technology was proposed

Method used

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  • Manufacturing method and application of poly brominated diphenyl ethers polluted soil in-situ remediation material
  • Manufacturing method and application of poly brominated diphenyl ethers polluted soil in-situ remediation material
  • Manufacturing method and application of poly brominated diphenyl ethers polluted soil in-situ remediation material

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preparation example Construction

[0033] A preparation method of dispersed nanometer Ni / Fe bimetallic particles, comprising the following steps:

[0034] 1) Dissolve iron salt or ferrous salt and polyvinylpyrrolidone in absolute ethanol, stir and mix well to obtain solution A, in which the mass ratio of iron salt or ferrous salt to polyvinylpyrrolidone is (0.5-3): 1;

[0035] 2) Dissolve the reducing agent in absolute ethanol, under the protection of protective gas, add it to solution A while stirring, continue to stir and react for 3 to 8 minutes, then separate the nanometer zero-valent iron, after washing, the nanometer zerovalent iron Iron was dissolved in absolute ethanol to obtain solution B;

[0036] 3) Dissolve nickel salt in absolute ethanol, add solution B, shake and react under the protection of protective gas for 15-60 minutes, separate metal particles, wash and dry to obtain dispersed nanometer Ni / Fe bimetallic particles.

[0037] The iron salt or ferrous salt used is FeSO 4 , FeCl 2 , Fe 2 (S...

Embodiment 1

[0053] Preparation of dispersed nanometer Ni / Fe bimetallic particles:

[0054] 1) Prepare 100ml of 0.1mol / L FeSO with absolute ethanol 4 ·7H 2 0 solution, added with FeSO 4 ·7H 2 0 Polyvinylpyrrolidone K30 (PVP K30) of the same quality was stirred at a speed of 600rpm for 15min to dissolve and mix to obtain solution A;

[0055] 2) Prepare 50ml of 0.3mol / L sodium borohydride solution with absolute ethanol, under the protection of nitrogen, quickly add it to solution A under stirring, continue to stir and react at a speed of 600rpm for 5min, and then separate by magnetic separation Remove the nanometer zero-valent iron, wash with deoxygenated water and dehydrated ethanol respectively for 3 times, then dissolve and disperse the nanometer zerovalent iron in 50ml of dehydrated ethanol to obtain solution B;

[0056] 3) Prepare 50ml of 0.03mol / L NiCl with absolute ethanol 2 ·6H 2 O solution, add solution B, under the protection of nitrogen, stir the reaction at a speed of 250rp...

Embodiment 2

[0059] Preparation of dispersed nanometer Ni / Fe bimetallic particles:

[0060] 1) Prepare 100ml of 0.02mol / L FeCl with absolute ethanol 2 solution, add PVP K30, mass FeCl 2 0.5 times of that, stirred at 400rpm for 20min to dissolve and mix to obtain solution A;

[0061] 2) Prepare 35ml of 0.06mol / L KBH with absolute ethanol 4 The solution, under the protection of nitrogen, was quickly added to solution A under stirring, and continued to stir and react at a speed of 400rpm for 5 minutes, and then separated nanometer zero-valent iron by magnetic separation, and washed them with deoxygenated water and absolute ethanol respectively. After each wash 3 times, dissolve and disperse the nanometer zero-valent iron in 50ml of absolute ethanol to obtain solution B;

[0062] 3) Prepare 100ml of 0.01mol / L NiCl with absolute ethanol 2 ·6H 2 O solution, add solution B, under the protection of nitrogen, shake and react at a speed of 250rpm for 15min, let the nickel deposit on the iron su...

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Abstract

The invention discloses a manufacturing method and application of a poly brominated diphenyl ethers polluted soil in-situ remediation material. A liquid phase reduction method is adopted, absolute ethyl alcohol is used as a solvent, and polyvinylpyrrolidone is used as a dispersing agent to prepare dispersed-type nanometer Ni / Fe double-metal particles. The method is temperate in reaction condition and low in energy consumption. Meanwhile, the effective method using the dispersed-type nanometer Ni / Fe double-meter particles to remediate poly brominated diphenyl ethers BDE209 polluted soil in an in-situ mode is provided, can treat and remediate soil with different BED209 polluted degrees, and is good in development prospect. The in-situ remediation method is simple in technology and convenient to operate. A user just needs to directly add the product of the manufacturing method and the application of the poly brominated diphenyl ethers polluted soil in-situ remediation material to the polluted soil and turns over the soil at regular intervals, other complex devices and technologies are not needed, and the in-situ remediation method is easy to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted environments, and in particular relates to a preparation method and application of an in-situ remediation material for polybrominated diphenyl ether-contaminated soil. Background technique [0002] Soil is an important part of the human ecological environment and one of the main natural resources for human survival. However, various environmental problems are becoming more and more prominent at present, and soil pollution has become one of the serious environmental problems in the world. The main pollutants that cause soil pollution are heavy metals, persistent organic pollutants, and petroleum. Among them, persistent organic pollutants (Persistent organic pollutants, POPs) will remain in the soil for a long time due to their long-term persistence, bioaccumulation, semi-volatility and high toxicity, causing more persistent pollution to soil pollution, and Pollution of the entire ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B09C1/08
Inventor 方战强谢莹莹
Owner SOUTH CHINA NORMAL UNIVERSITY
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