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A kind of in situ repair agent and its preparation method and application

An in-situ repair and medicament technology, applied in the field of environmental pollution remediation, to achieve the effect of simple operation

Active Publication Date: 2021-03-12
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing supported nano-zero-valent iron cannot achieve the degradation of both adsorbed and free halogenated organic pollutants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] In the present invention, the preparation method of the modified biotite loaded nanometer zero-valent zinc preferably comprises the following steps:

[0039] mixing biotite, soluble zinc salt and water, adjusting the pH value of the obtained mixed solution to 3-4, performing ion exchange reaction, and obtaining zinc ion-saturated biotite;

[0040] In a protective atmosphere, the zinc ion-saturated biotite is mixed with a first organic modifier to carry out a crosslinking reaction to obtain a modified zinc ion-saturated biotite; the first organic modifier preferably includes an alkyl-substituted bromine ammonium chloride, azobisisobutyronitrile, methyl methacrylate and n-octanol;

[0041] In a protective atmosphere, the modified zinc ions were saturated with biotite and Ce(BH 4 ) 3 mixing and performing a reduction reaction to obtain the modified biotite loaded nanometer zero-valent zinc.

[0042] The invention mixes biotite, soluble zinc salt and water, adjusts the p...

Embodiment 1

[0097] (1) Preparation of modified biotite-loaded nanometer zero-valent zinc

[0098] Stir and mix 50g biotite and 2.5L deionized water for 5min, add 1mol ZnCl 2 Stir and mix evenly, adjust the pH value of the obtained mixed solution to 3, perform an ion exchange reaction at room temperature and under stirring conditions for 18 hours, centrifuge and discard the supernatant, repeat the ion exchange reaction 3 times, and obtain zinc ion-saturated biotite;

[0099] 1.8L n-octanol, 360g tetramethylammonium bromide, 36g azobisisobutyronitrile and 720mL methyl methacrylate were stirred and mixed for 30min to obtain the first organic modifier; 50g zinc ion saturated biotite 2.5L The first organic modifier is stirred and mixed evenly, and the modification reaction is carried out in a nitrogen atmosphere at 60° C. under stirring conditions for 12 hours to obtain a modified zinc ion-saturated biotite;

[0100] In a nitrogen atmosphere, 50g of the modified zinc ion-saturated biotite and...

Embodiment 2

[0111] (1) Preparation of modified biotite-loaded nanometer zero-valent zinc

[0112] Stir and mix 420g biotite and 10.5L deionized water for 5min, add 4.2mol ZnCl 2 Stir and mix evenly, adjust the pH value of the obtained mixed solution to 3, perform an ion exchange reaction at room temperature and under stirring conditions for 18 hours, centrifuge and discard the supernatant, repeat the ion exchange reaction 3 times, and obtain zinc ion-saturated biotite;

[0113] 16.8L n-octanol, 4.2kg tetramethylammonium bromide, 420g azobisisobutyronitrile and 4.2L methyl methacrylate were stirred and mixed for 30min to obtain the first organic modifier; 420g zinc ion saturated biotite Stir and mix with 21L of the first organic modifier, and carry out the modification reaction for 12 hours in a nitrogen atmosphere at 70°C under stirring conditions to obtain modified zinc ion-saturated biotite;

[0114] In a nitrogen atmosphere, 420g of the modified zinc ion saturated biotite and 16.8mol ...

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Abstract

The invention provides an in-situ remediation agent, a preparation method and application thereof, and relates to the technical field of environmental pollution remediation. The in-situ restoration agent provided by the present invention includes modified biotite-loaded nano-zero-valent zinc, modified hectorite-loaded nano-zero-valent zinc, starch and edible oil; the modified biotite-loaded nano-zero-valent zinc contains nano-zero The valence zinc is loaded on the middle layer of the modified biotite; the modified biotite is obtained by modifying the biotite by alkyl-substituted ammonium bromide, azobisisobutyronitrile, methyl methacrylate and n-octanol; The modified hectorite supports nano-zero-valent zinc in the middle layer of the modified hectorite; the modified hectorite is composed of alkyl-substituted ammonium bromide, azobisisobutyronitrile, acrylic acid ‑2‑Ethylhexyl ester and n-octanol modified hectorite. The in-situ remediation agent provided by the invention has good dispersibility, realizes efficient degradation of adsorbed state and free state halogenated organic pollutants, and also provides nutrients for microbial reactions in soil.

Description

technical field [0001] The invention relates to the technical field of environmental pollution remediation, in particular to an in-situ remediation agent and its preparation method and application. Background technique [0002] Halogenated organic pollutants are a kind of common soil pollutants, usually including organochlorine solvents, petroleum hydrocarbons and their derivatives, etc. They are easy to leak into the soil during the transportation, storage and use of chemical products. In addition to being difficult to dissolve in water, it can remain in the underground environment for decades due to its non-biodegradable characteristics, causing continuous potential harm to human health and the ecological environment. [0003] The vadose zone refers to the zone above the water table below the ground. The soil voids are not filled with water and contain air. The main forms of water are gaseous water, adsorbed water and capillary water. The first thing that pollutants enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08B09C2101/00C09K17/40
Inventor 喻恺肖潇罗旭彪石慧邵鹏辉杨利明任重熊贞晟
Owner NANCHANG HANGKONG UNIVERSITY