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Improved nanometer nulvalent iron particle and method for making same

A nano-zero-valent iron and particle technology is applied in the field of improving nano-zero-valent iron particles and their preparation, and can solve the problems of large specific surface area, small average particle size, and easy agglomeration.

Inactive Publication Date: 2007-02-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problems of uneven particle distribution and easy agglomeration in the process of preparing nano-zero-valent iron particles by liquid phase reduction method
The invention provides an improved nanometer zero-valent iron particle and a preparation method thereof to improve defects such as uneven particle distribution and easy agglomeration, and obtain improved nanometer iron particles with uniform distribution, small average particle size and large specific surface area

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: (comparative experiment)

[0041] Weigh 0.13 g of FeSO 4 .7H 2 O, dissolved in 50ml ethanol-water mixed solution (ethanol: water = 1:9), made into 0.01M FeSO 4 .7H 2 O ethanol-water mixed solution, electromagnetic stirring to make it fully mixed. The solution was then added to a 200ml Erlenmeyer flask placed on a mechanical stirrer. Weigh 0.0567g NaBH 4 , dissolved in 50ml ethanol-water mixed solution (ethanol: water = 1:9), made into 0.03M NaBH 4 ethanol-water mixed solution. Under the condition of mechanical stirring, the NaBH 4 Ethanol-water mixed solution was added rapidly to FeSO 4 .7H 2 O ethanol-water mixed solution, continue to stir for 5-15 seconds, and stop stirring when the solution turns black. Selected by magnetic separation, first fully washed three times with distilled water, then fully washed three times with acetone or ethanol, and stored in acetone or ethanol.

[0042] TEM test results show that the particle size range is 40-10...

Embodiment 2

[0046] Weigh 0.139 g FeSO 4 .7H 2 O, dissolved in ethanol-water mixed solution (ethanol: water = 1:9), made into 50ml 0.01M FeSO 4 .7H 2 O ethanol-water mixed solution, then add 0.1g polyvinylpyrrolidone (PVP K-30), electromagnetic stirring makes it fully mixed. The solution was then added to a 200ml Erlenmeyer flask placed on a mechanical stirrer. Weigh 0.0567g NaBH 4 , dissolved in ethanol-water mixed solution (ethanol: water = 1:9), made into 50ml 0.03M NaBH 4 ethanol-water mixed solution. Under the condition of mechanical stirring, the NaBH 4 Ethanol-water mixed solution was added rapidly to FeSO 4 .7H 2 In the ethanol-water mixed solution, continue to stir for 5-15 seconds, and stop stirring when the solution turns black. Selected by magnetic separation, first fully washed three times with distilled water, then fully washed three times with acetone or ethanol, and stored in acetone or ethanol.

[0047] The test result of TEM shows that the particle size range is...

Embodiment 3

[0051] Weigh 0.139 g FeSO 4 .7H 2 O, dissolved in ethanol-water mixed solution (ethanol: water = 1:9), made into 50ml 0.01M FeSO 4 .7H 2 0 ethanol-water mixed solution, then add 0.2g polyvinylpyrrolidone (PVP), electromagnetic stirring makes it fully mix. The solution was then added to a 200ml Erlenmeyer flask placed on a mechanical stirrer. Weigh 0.0567g NaBH 4 , dissolved in ethanol-water mixed solution (ethanol: water = 1:9), made into 50ml 0.03M NaBH 4 ethanol-water mixed solution. Under the condition of mechanical stirring, the NaBH 4 Ethanol-water mixed solution was added rapidly to FeSO 4 .7H 2 O ethanol-water mixed solution, continue to stir for 5-15 seconds, and stop stirring when the solution turns black. Selected by magnetic separation, first fully washed three times with distilled water, then fully washed three times with acetone or ethanol, and stored in acetone or ethanol.

[0052] TEM test results show that the particle size range is 30-60nm, and the a...

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Abstract

The invention discloses a modified nanometer nulvalent ferric particle and preparing method with grain size at 20-50nm and even grain size at 30-40nm and specific surface at60-70m<2> / g, which comprises the following steps: allocating soluble ferric salt solution and NaBH4 or KBH4 alcohol-water composite solution with bulk rate at 1: 1-20, adding polyvinyl pyrrolidone in the soluble ferric salt solution according to rate, stirring evenly, adding NaBH4 or KBH4 alcohol-water composite solution in the soluble ferric salt solution, stirring continually until the solution becomes black, adopting magnetic method to select nanometer nulvalent ferric particle, washing through distilled water completely, washing through acetone or alcohol then, reserving in the acetone or alcohol.

Description

1. Technical field [0001] The invention relates to an improved nano-zero-valent iron particle and a preparation method thereof, more specifically, a method for preparing nano-zero-valent iron particles by using an improved liquid phase reduction method and the prepared improved nano-zero-valent iron particle. 2. Background technology [0002] Zero-valent ferroelectricity is relatively large and has strong reducibility. It can be used to treat certain trace organic pollutants in water bodies, and can act as a catalyst to accelerate the reaction process. Both indoor experiments and field tests have shown that zero-valent iron particles can degrade halogenated aliphatic hydrocarbons, halogenated aromatic hydrocarbons, and some polychlorinated biphenyl chemical pollutants, that is, when pollutants such as halogenated hydrocarbons or halogenated aromatic hydrocarbons After the halogen atoms on the surface get the electrons provided by the zero-valent iron, the halogens will fall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 王晓栋高树梅刘洋赵欣王海燕唐信英刘树深王连生
Owner NANJING UNIV
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