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Vulcanized chelated zero-valent iron as well as preparation method and application thereof

A technology of zero-valent iron and chelated state, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of easy aggregation of zero-valent iron and high resistance of iron oxide film, and achieve Good adsorption performance, resistance reduction, and the effect of overcoming defects

Active Publication Date: 2022-03-11
XI AN JIAOTONG UNIV
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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 sulfide chelated zero-valent iron and its preparation method and application, in order to solve the technical problems of traditional zero-valent iron easy to agglomerate and high resistance of iron oxide film

Method used

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  • Vulcanized chelated zero-valent iron as well as preparation method and application thereof
  • Vulcanized chelated zero-valent iron as well as preparation method and application thereof
  • Vulcanized chelated zero-valent iron as well as preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of sulfurized chelated zero-valent iron, comprising the following steps:

[0041] Add 3.5000g of ferrous sulfate and 4mL of N,N-dimethylformamide into a three-necked flask filled with 200mL of ultrapure water at normal temperature and pressure, and stir for 5 minutes to obtain a mixed solution; In a 100mL beaker, add 4.0000g sodium borohydride, 75mL ultrapure water, stir and dissolve to obtain NaBH 4 solution; at normal temperature and pressure, the NaBH 4 The solution was added dropwise to the mixed solution, the solution turned black and gradually formed particles, NaBH 4 After the dropwise addition of the solution was completed, 3.5000 g of triazine trithiol trisodium salt hydrate (TMT) was added, stirred and reacted for 15 minutes, separated and washed, and freeze-dried at -60° C. under vacuum to obtain sulfide-chelated zero-valent iron.

Embodiment 2

[0043] A preparation method of sulfurized chelated zero-valent iron, comprising the following steps:

[0044] Add 4.0000g of ferrous sulfate and 5mL of N,N-dimethylformamide into a three-necked flask filled with 250mL of ultrapure water at normal temperature and pressure, and stir for 10 minutes to obtain a mixed solution; In a 100mL beaker, add 4.7000g sodium borohydride, 90mL ultrapure water, stir and dissolve to obtain NaBH 4 solution; at normal temperature and pressure, the NaBH 4 The solution was added dropwise to the mixed solution, the solution turned black and gradually formed particles, NaBH 4 After the dropwise addition of the solution was completed, 3.7000 g of sodium thiosulfate was added, stirred and reacted for 17 minutes, separated and washed, and freeze-dried at -55° C. under vacuum to obtain zero-valent iron in a sulfide chelated state.

Embodiment 3

[0046] A preparation method of sulfurized chelated zero-valent iron, comprising the following steps:

[0047] Add 5.2000g of ferrous sulfate and 6mL of N,N-dimethylformamide into a three-necked flask filled with 300mL of ultrapure water at normal temperature and pressure, and stir for 15 minutes to obtain a mixed solution; In a 100mL beaker, add 5.0000g sodium borohydride, 100mL ultrapure water, stir and dissolve to obtain NaBH 4 solution; at normal temperature and pressure, the NaBH 4 The solution was added dropwise to the mixed solution, the solution turned black and gradually formed particles, NaBH 4 After the solution was added dropwise, 4.0000 g of sodium dithionite was added, stirred and reacted for 20 minutes, separated and washed, and freeze-dried at -50° C. under vacuum to obtain sulfide-chelated zero-valent iron.

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Abstract

The invention discloses vulcanized chelated zero-valent iron as well as a preparation method and application thereof, belongs to the technical field of heavy metal pollution remediation, and solves the technical problems that traditional zero-valent iron is easy to agglomerate and an iron oxide film is high in resistance. According to the sulfurized chelated zero-valent iron disclosed by the invention, ferrous ions are chelated by adopting a nitrogen-containing compound, a NaBH4 solution is added into a mixed solution to form the chelated zero-valent iron, then the chelated zero-valent iron is sulfurized by adopting a sulfurizing agent, and finally the amorphous sulfurized chelated zero-valent iron is formed. The chelating-state zero-valent iron can provide electrons more easily, the agglomeration problem is effectively solved, in the preparation process, ferrous sulfate is used for wrapping the chelating-state zero-valent iron particles with a layer of iron sulfide film, the defects of a traditional zero-valent iron material are overcome, and therefore the material has very wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution, and in particular relates to a vulcanized chelated zero-valent iron and a preparation method and application thereof. Background technique [0002] Human activities have led to an increasing amount of heavy metals in the environment, such as the application of pesticides and fertilizers, improper stacking of industrial residues, and the development of industries such as chemical manufacturing, metal plating, tanning, and sewage irrigation. Heavy metals can accumulate in the environment through a variety of pathways. Due to their long-term persistence, bioaccumulation, and biomagnification, heavy metals can produce toxic effects through the food chain even in places far away from pollution sources. For example, heavy metals entering freshwater ecosystems are eventually adsorbed into sediments, where they bioaccumulate in benthic organisms and enter the human body along...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/20
CPCC02F1/705C02F2101/20
Inventor 郑春莉林子深
Owner XI AN JIAOTONG UNIV
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