Nanometer zero-valent iron particle capable of stably existing in air, and preparation method thereof

A nano-zero-valent iron and nano-iron technology, which is applied in the nano field, can solve the problems that the stable existence of oxidation cannot be completely prevented, the preparation process is cumbersome, and there are no research reports, and the effects of good market prospects, simple process and simple equipment can be achieved.

Inactive Publication Date: 2009-09-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of coating nano-zero-valent iron particles cannot completely prevent oxidation and exist stably in the air, and the preparation process is relatively cumbersome and the equipment requirements are still high.
[0006] Chitosan is a kind of natur...

Method used

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  • Nanometer zero-valent iron particle capable of stably existing in air, and preparation method thereof
  • Nanometer zero-valent iron particle capable of stably existing in air, and preparation method thereof
  • Nanometer zero-valent iron particle capable of stably existing in air, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A nanometer zero-valent iron particle that can exist stably in the air, the nanometer zerovalent iron particle is based on the nanometer zerovalent iron particle, and its surface is coated with nanometer chitosan particles. Its preparation method comprises the following steps:

[0032] (1). Preparation of chitosan nitric acid solution:

[0033] Dissolve chitosan with a molecular weight of 100,000 in 0.05mol / L HNO 3 In solution, obtain the chitosan nitric acid solution that mass percent composition is 0.5%;

[0034] (2). Deoxygenation:

[0035] Add 10ml of FeSO containing 0.2978g to 3ml of the above chitosan nitric acid solution 4 ·7H 2 O aqueous solution, so that the molar concentration of iron ions is 0.082mol / L, then pass through nitrogen to remove oxygen for 30 minutes, and then mechanically stir for 10 minutes to make the mixing uniform and sufficient to obtain a mixed solution;

[0036] (3). Preparation of nano-iron solution:

[0037] Add 10ml of 0.535mol / L f...

Embodiment 2

[0041] When preparing the black nano-iron solution, the reactant uses NaBH 4 Solution Replacement KBH 4 solution, and others are the same as in Example 1.

Embodiment 3

[0043] A nanometer zero-valent iron particle that can exist stably in the air, the nanometer zerovalent iron particle is based on the nanometer zerovalent iron particle, and its surface is coated with nanometer chitosan particles. Its preparation method comprises the following steps:

[0044] (1). Preparation of chitosan nitric acid solution:

[0045] Dissolve chitosan with a molecular weight of 50000 in 0.05mol / L HNO 3 In solution, obtain the chitosan nitric acid solution that mass percentage composition is 0.3%;

[0046] (2). Deoxygenation:

[0047] Add 10ml of FeSO containing 0.1489g to 3ml of the above chitosan nitric acid solution 4 ·7H 2 O aqueous solution, so that the molar concentration of iron ions is 0.041mol / L, then pass through nitrogen to remove oxygen for 20 minutes, and then mechanically stir for 10 minutes to make the mixing uniform and sufficient to obtain a mixed solution;

[0048] (3). Preparation of nano-iron solution:

[0049] Add 8ml of 0.535mol / L f...

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Abstract

The invention relates to a nanometer zero-valent iron particle capable of stably existing in air, and a preparation method thereof. The nanometer zero-valent iron particle capable of stably existing in air takes a nanometer zero-valent iron particle as a core of which the surface is coated with a nanometer chitosan particle. The preparation method adopts a liquid-phase reduction method to prepare the nanometer zero-valent iron particle capable of stably existing in air, utilizes a strong reducing agent KBH4 or NaBH4 to reduce Fe<2+> so as to obtain Fe<0>, and performs surface modification through chitosan so as to greatly improve the oxidation resistance of the nanometer zero-valent iron particle. In addition, the prepared nanometer zero-valent iron particle has the advantages of uniform distribution, small average particle size, large specific surface area, much higher pollutant-removing capability than common iron powder and capability of being widely applied to the field of treating environmental pollution and restoring environment.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to nano zero-valent iron particles that can exist stably in the air and a preparation method thereof. Background technique [0002] Zero-valent iron has a large electronegativity and strong reducibility. The use of zero-valent iron to reduce environmental pollutants has been widely researched and applied at home and abroad in recent years, especially the use of nano-zero-valent iron, a high-tech pollution control technology. Compared with ordinary iron powder, nano-zero-valent iron has the characteristics of small particle size, large specific surface area, and large surface energy. It has high activity in the reaction with other substances, and the treatment effect is far better than ordinary iron powder. It has a good application prospect, but the special activity of nano zero-valent iron requires harsh operating conditions in the process of preparation and use. [0003] At present...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 金朝晖李铁龙耿兵
Owner NANKAI UNIV
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