Preparation method of porous silicon coated zero-valent iron material for in-situ remediation of groundwater pollution

A technology for groundwater pollution and in-situ remediation

Active Publication Date: 2018-12-18
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of porous silicon-coated zero-valent iron material for in-situ repair of groundwater pollution, to solve the problems of easy oxidation, easy agglomeration, poor mobility, and easy activity of nano-iron in in-situ repair of groundwater pollution. Weakened by the chemical composition of groundwater, ecological toxicity and secondary pollution, etc., providing a preparation method for porous silicon-coated zero-valent iron materials that can be used for in-situ remediation of groundwater pollution

Method used

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  • Preparation method of porous silicon coated zero-valent iron material for in-situ remediation of groundwater pollution
  • Preparation method of porous silicon coated zero-valent iron material for in-situ remediation of groundwater pollution
  • Preparation method of porous silicon coated zero-valent iron material for in-situ remediation of groundwater pollution

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Embodiment 1

[0033] see Figure 1 to Figure 5 As shown in the present invention, the preparation method of the porous silicon-coated zero-valent iron material for in-situ remediation of groundwater pollution is to add ferric chloride to a mixed solution of ethanol, water and ethyl orthosilicate, and then add dropwise after mixing evenly. The mixed solution of potassium borohydride or sodium borohydride and sodium hydroxide is magnetically separated, washed and dried in vacuum after the reaction. The preparation process is carried out under the protection of inert gas. The prepared porous silicon-coated zero-valent iron material has a large specific surface area and an actual particle size of 0.5–0.8 μm, which is within the optimal size range for colloidal particles to migrate through the porous medium of the aquifer, compared with uncoated zero-valent iron. , its activity and migration ability in the porous media of aquifers have been greatly improved, which overcomes the disadvantage tha...

Embodiment 2

[0037] A preparation of a porous silicon-coated zero-valent iron material that can be used for in-situ remediation of groundwater pollution, the preparation process specifically includes the following steps:

[0038] (1) Add 0.5 mL of ethyl orthosilicate to 150 mL of a mixed solution of water and anhydrous ethanol (volume ratio is 1:3), stir evenly, then add 0.17 g of anhydrous ferric chloride, and continue to stir 10 minutes;

[0039] (2) Preparation of BH 4 - 20 mL of potassium borohydride or a mixed solution of sodium borohydride and sodium hydroxide with a concentration of 0.56 mol / L and a concentration of sodium hydroxide of 2.5 mol / L was added dropwise to step (1) at a rate of 6 mL / min. ) in the solution prepared by adding dropwise while stirring (the stirring speed is 1000 r / min), and continuing to stir for 1 h after the dropwise addition. Unreacted ethyl orthosilicate and excess borohydride were washed away with a mixed solution of ethanol and water, and finally vac...

Embodiment 3

[0041] A preparation of a porous silicon-coated zero-valent iron material that can be used for in-situ remediation of groundwater pollution, the preparation process specifically includes the following steps:

[0042] (1) Add 0.45 mL of ethyl orthosilicate to 120 mL of a mixed solution of water and anhydrous ethanol (volume ratio is 1:2.3), stir evenly, then add 0.17 g of anhydrous ferric chloride, continue stirring 10 minutes;

[0043] (2) Preparation of BH 4 - 20 mL of potassium borohydride or a mixed solution of sodium borohydride and sodium hydroxide with a concentration of 0.56 mol / L and a concentration of sodium hydroxide of 5 mol / L was added dropwise to step (1) at a rate of 5 mL / min. ) in the solution prepared by adding dropwise while stirring, and continued stirring for 1 h after the dropwise addition. The entire reaction process was carried out under the protection of inert gas, and the obtained black solid was separated by magnetic separation, and then washed with ...

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Abstract

The invention relates to a preparation method of a porous silicon coated zero-valent iron material for in-situ remediation of groundwater pollution, and belongs to the field of nano and new environmental remediation materials. According to the preparation method, ferric chloride is added to a mixed solution of ethyl alcohol, water and tetraethyl orthosilicate, after even stirring is carried out, potassium borohydride or a mixed solution of sodium borohydride and sodium hydroxide is dropped, and after the reaction is completed, magnetic separation, washing and vacuum drying are carried out. Thepreparation process is carried out under the protection of inert gas. The prepared porous silicon coated zero-valent iron material has a large specific surface area and the particle size is within the optimal size range (0.1-1[Mu]m) for colloidal particles to transfer through aquifer porous media, compared with uncoated zero-valent iron, the activity of the porous silicon coated zero-valent ironmaterial and the transfer ability in the aquifer porous media are both greatly improved, the disadvantage that the activity of nano-iron is prone to being weakened by the chemical composition of groundwater is overcome, secondary pollution and ecological toxicity caused by iron ion desolvation are reduced, and the preparation method can be used for the in-situ remediation of the groundwater pollution.

Description

technical field [0001] The invention relates to the field of nanometer and new environmental remediation materials, in particular to a preparation method of a porous silicon-coated zero-valent iron material used for in-situ remediation of groundwater pollution. Background technique [0002] As a new type of environmental remediation material, nano-iron has a high specific surface area and reactivity, and can treat a variety of environmental pollutants, which has become a hot spot of research and application at home and abroad. At the same time, the nano-scale particle size (50-100 nm) enables it to be directly injected into polluted aquifers for the degradation of pollutants, which has great application potential in in-situ remediation of groundwater pollution. Compared with ex-situ groundwater restoration, in-situ restoration does not require excavation of trenches, and has the advantages of economy, environmental protection, and easy operation. [0003] But nano-iron is p...

Claims

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Application Information

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IPC IPC(8): B09C1/00B82Y40/00B01J20/20B01J20/28
CPCB01J20/02B01J20/20B01J20/28061B01J20/28071B09C1/002B82Y40/00
Inventor 董军鹿豪杰夏添张梦玥张瀚元
Owner JILIN UNIV
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