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Method for preparing zero-valence nano-iron particles

A technology of zero-valent nano-iron and particles, which is applied in the field of materials, can solve the problems of uneven distribution and large particle size of nano-iron particles, and achieve the effects of uniform distribution, simple preparation method and easy operation

Active Publication Date: 2015-01-28
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nano-iron particles prepared by all these methods have the defects of large particle size and uneven distribution.

Method used

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  • Method for preparing zero-valence nano-iron particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 5.56g of FeSO 4 ·7H 2 O, dissolved in 100 ml of deionized water to give FeSO 4 ·7H 2 Aqueous solution of O.

[0024] Then weigh 10g of polyvinylpyrrolidone (PVP) and add it to FeSO 4 ·7H 2 O solution, and then placed on a magnetic stirrer for stirring to dissolve the PVP. After stirring evenly, a mixed spinning solution with an iron salt concentration of 0.2 M and a mass percentage concentration of PVP of 9.1% was obtained, and electrospinning was carried out. process. The distance between the needle and the aluminum foil is 8.5cm. When the flow rate of PVP is 3μl / min, the positive voltage is 6.5kv and the negative voltage is 9kv. .

[0025] 2) Weigh 3.02g NaBH 4 , placed in 100ml of deionized water, configured as 0.8mol / L NaBH 4 of aqueous solution.

[0026] In an anaerobic incubator, NaBH 4 The aqueous solution was gradually added dropwise on the nanofiber mat, the fiber mat was dissolved, stirred to make the reaction complete, and a black suspensi...

Embodiment 2

[0029] 1) Weigh 5.56g of FeSO 4 ·7H 2 O, dissolved in 100 ml of deionized water to give FeSO 4 ·7H 2 Aqueous solution of O.

[0030] Then 3g polyethylene oxide (PEO) was weighed and added to FeSO 4 ·7H 2 In an aqueous solution of O, then placed on a magnetic stirrer for stirring, PEO was dissolved, and after stirring uniformly, a mixed spinning solution with an iron salt concentration of 0.2 M and a mass percentage concentration of PEO of 2.9% was obtained, thereby electrospinning silk process. The distance between the needle and the aluminum foil is 9 cm, when the flow rate of PEO is 10 μl / min, the positive voltage is 6.5 kV, and the negative voltage is 7 kV.

[0031] 2) Weigh 3.02g of NaBH 4 , placed in 100ml of deionized water, configured as 0.8mol / L NaBH 4 of aqueous solution.

[0032] In an anaerobic incubator, NaBH 4 The aqueous solution was gradually added dropwise on the nanofiber mat, the fiber mat was dissolved, stirred to make the reaction complete, and a ...

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Abstract

The invention discloses a method for preparing zero-valence nano-iron particles. The method comprises the following steps: 1), uniformly mixing a soluble iron salt aqueous solution with a polyelectrolyte so as to obtain a polymer solution, and carrying out electrostatic spinning so as to obtain a nano fibrofelt; 2), reacting a reducing agent aqueous solution with the nano fibrofelt obtained in the step 1) under an anaerobic condition, and collecting precipitates, namely the zero-valence nano-iron particles after reaction is finished. The nano-iron particles prepared by the method have average particle diameter of 20-50nm, are uniform in dispersion, can change along with regulation of each parameter condition and are free from a clustering phenomenon.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing zero-valent nano-iron particles. Background technique [0002] Zero-valent iron nanoparticles have attracted much attention due to their excellent magnetic properties and huge application potential, and can be widely used in many fields such as magnetic fluid preparation, magnetic resonance imaging, magnetic cell separation, catalysis and environmental remediation. Especially in the field of environmental remediation, a large number of studies have shown that compared with ordinary iron powder and iron filings, zero-valent nano-iron has smaller particle size, larger specific surface area, strong adsorption, larger surface energy and higher activity. Nano-iron particles have good application prospects in the treatment of pollutants such as chloride, heavy metal ions, dyes and nitrates. [0003] Zero-valent nano-iron refers to Fe with a particle size of 1 to 100 nm. ...

Claims

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Application Information

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IPC IPC(8): B22F9/24D01D1/02D01D5/00D04H1/728B82Y40/00B82Y30/00
Inventor 程荣程灿张萌李冠清杨喆谭雪马中石磊
Owner RENMIN UNIVERSITY OF CHINA