Modified nano zero-valent iron with core-shell structure as well as preparation method and application of modified nano zero-valent iron

A technology of nano-zero-valent iron and core-shell structure, which is applied in chemical instruments and methods, restoration of contaminated soil, water/sludge/sewage treatment, etc., can solve problems such as improving the reduction and removal efficiency of heavy metal ions, and is easy to provide Electrons, fast electron transfer rate, beneficial to industrial production

Active Publication Date: 2022-07-15
陕西省中勘环境地质研究中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a modified nano-zero-valent iron with a core-shell structure and its preparation method and application, so as to solve the problem that the existing nano-zero-valent iron cannot completely overcome its own defects. Technical Problems in Improving the Reduction and Removal Efficiency of Heavy Metal Ions

Method used

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  • Modified nano zero-valent iron with core-shell structure as well as preparation method and application of modified nano zero-valent iron
  • Modified nano zero-valent iron with core-shell structure as well as preparation method and application of modified nano zero-valent iron
  • Modified nano zero-valent iron with core-shell structure as well as preparation method and application of modified nano zero-valent iron

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Effect test

Embodiment 1

[0039] A preparation method of modified nano-zero valent iron with core-shell structure, comprising the following steps:

[0040] Under normal temperature and pressure, add 2.2700g of ferrous sulfate and 1.2g of 2-aminocyclohexanecarboxylic acid into the three-necked flask containing 200mL of ultrapure water, stir and mix for 5min to obtain a mixed solution; under normal temperature and pressure, in 100mL In the beaker, add 4.0000g potassium borohydride, 75mL ultrapure water, stir to dissolve, and mix well to obtain KBH 4 solution; at room temperature and normal pressure, the obtained KBH 4 The solution was added dropwise to the resulting mixed solution, the solution turned black and gradually formed particles, KBH 4 After the dropwise addition of the solution was completed, the reaction was stirred for 10 minutes, the solid-liquid was separated, washed, and freeze-dried at -60°C in a vacuum condition to obtain a modified nano-zero valent iron with a core-shell structure.

Embodiment 2

[0042] A preparation method of modified nano-zero valent iron with core-shell structure, comprising the following steps:

[0043] Under normal temperature and pressure, add 3.5600g of ferrous sulfate and 1.8g of 2-aminocyclohexanecarboxylic acid into a three-necked flask containing 250mL of ultrapure water, stir and mix for 10min to obtain a mixed solution; Add 4.6000g potassium borohydride, 80mL ultrapure water, stir to dissolve, and mix well to obtain KBH 4 solution; at room temperature and normal pressure, the obtained KBH 4 The solution was added dropwise to the resulting mixed solution, the solution turned black and gradually formed particles, KBH 4 After the dropwise addition of the solution was completed, the reaction was stirred for 13 minutes, the solid-liquid was separated, washed, and freeze-dried at -55°C in a vacuum condition to obtain a modified nano-zero valent iron with a core-shell structure.

Embodiment 3

[0045] A preparation method of modified nano-zero valent iron with core-shell structure, comprising the following steps:

[0046] Under normal temperature and pressure, add 4.5400g of ferrous sulfate and 2.4g of 2-aminocyclohexanecarboxylic acid into a three-necked flask containing 300mL of ultrapure water, stir and mix for 15min to obtain a mixed solution; under normal temperature and pressure, in 100mL Add 5.0000g potassium borohydride, 100mL ultrapure water, stir to dissolve, and mix well to obtain KBH 4 solution; at room temperature and normal pressure, the obtained KBH 4 The solution was added dropwise to the resulting mixed solution, the solution turned black and gradually formed particles, KBH 4 After the dropwise addition of the solution was completed, the reaction was stirred for 15 minutes, the solid-liquid was separated, washed, and freeze-dried at -50°C in a vacuum condition to obtain a modified nano-zero valent iron with a core-shell structure.

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Abstract

The invention discloses modified nano zero-valent iron with a core-shell structure as well as a preparation method and application thereof, belongs to the technical field of heavy metal pollution remediation, and solves the technical problem that the existing nano zero-valent iron cannot completely overcome the defects of the nano zero-valent iron so as to remarkably improve the reduction removal efficiency of heavy metal ions. The invention discloses a preparation method of modified nano zero-valent iron with a core-shell structure, which comprises the following steps: chelating ferrous ions by adopting an amino carboxylic acid compound, adding a KBH4 solution into a mixed solution to form amorphous nano zero-valent iron, and reacting for a certain time to finally obtain the modified nano zero-valent iron with the core-shell structure. According to the method, the modified nanoscale zero-valent iron material with the core-shell structure can be prepared through one step and one modified material, and the preparation process is simple. The modified nano zero-valent iron with the core-shell structure obtained by the method is not easy to oxidize, weak in agglomeration effect, long in storage time, higher in electron transfer rate and higher in heavy metal ion removal efficiency.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution remediation, and in particular relates to a modified nano-zero valent iron with a core-shell structure and a preparation method and application thereof. Background technique [0002] Nano-zero valent iron (nZVI) is an active metal whose standard electrode potential is E 0 (Fe 2+ / Fe)=-0.44V, with strong reducing ability, it can reduce the heavy metal ions ranked next in the metal activity sequence table to elemental substances and deposit on the surface of iron to achieve the purpose of removing pollution. [0003] The traditional nano-zero valent iron has three defects: (1) it is easy to be inactivated by air oxidation and difficult to store for a long time; (2) it is easy to aggregate into agglomerates due to the high specific surface Gibbs free energy; (3) nano-iron is Crystal state, the ability to donate electrons is not high. The above three defects reduce the reduction and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70B09C1/08C02F101/20
CPCC02F1/70B09C1/08C02F2101/20Y02P10/20
Inventor 马晓炜张凯张俊峰彭渊哲谢金艳郑春莉林子深
Owner 陕西省中勘环境地质研究中心有限公司
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