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Silica micropowder loaded type nano zerovalent iron particle and preparation method thereof

A technology of nano-zero-valent iron and silicon micropowder, which is applied in the field of nano-material preparation to achieve the effect of simple process, simple equipment and uniform distribution

Inactive Publication Date: 2011-01-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention carries out loading by silicon micropowder, so that the anti-agglomeration performance of nanometer zero-valent iron particles has been greatly improved, the ability to remove pollutants has been enhanced, and it has strong mobility in simulated soil. The preparation of zero-valent iron particles has not been reported

Method used

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  • Silica micropowder loaded type nano zerovalent iron particle and preparation method thereof
  • Silica micropowder loaded type nano zerovalent iron particle and preparation method thereof
  • Silica micropowder loaded type nano zerovalent iron particle and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] A preparation method of silicon micropowder-loaded nanometer zero-valent iron particles, comprising the following steps:

[0034] (1) Preparation of modified silica powder:

[0035] Prepare 13g / L silicon micropowder slurry, then add 1.7mol / L hydrochloric acid solution, stir evenly, settle naturally for 3 hours, and take the upper layer slurry and centrifuge it.

[0036] (2) Deoxygenation:

[0037] Dissolve the above-mentioned centrifuged silicon micropowder in anhydrous FeCl 3 In the mixed solution (volume ratio of alcohol and water is 3:7), the molar concentration of iron ions is 0.011mol / L, nitrogen gas is introduced to remove oxygen for 20 minutes, and mechanically stirred for 10 minutes to make the mixing uniform and sufficient to obtain a mixed solution.

[0038] (3) Preparation of nano-iron solution:

[0039] Add 10ml of 0.268mol / L freshly prepared KBH dropwise to the mixed solution under mechanical stirring 4 solution, and reacted for 30 minutes to obtain a b...

Embodiment 2

[0043] 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

[0045] A preparation method of silicon micropowder-loaded nanometer zero-valent iron particles, comprising the following steps:

[0046] (1) Preparation of modified silica powder:

[0047] Prepare 13g / L silicon micropowder slurry, then add 1.3mol / L hydrochloric acid solution, stir evenly, settle naturally for 2.5h, take the upper layer slurry and centrifuge.

[0048] (2) Deoxygenation:

[0049] Dissolve the above-mentioned centrifuged silicon micropowder in anhydrous FeCl 3 In the mixed solution (alcohol-water volume ratio is 3:7), the molar concentration of iron ions is 0.014mol / L, nitrogen deoxygenation is introduced for 30min, mechanically stirred for 10min to make the mixing uniform and sufficient, and a mixed solution is obtained.

[0050] (3) Preparation of nano-iron solution:

[0051] Add 10ml of 0.358mol / L freshly prepared KBH dropwise to the mixed solution under mechanical stirring 4 solution, and reacted for 35 minutes to obtain a black nano-iron solution.

[00...

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Abstract

The invention belongs to the technical field of nano material preparation and relates to a silica micropowder loaded type nano zerovalent iron particle and a preparation method thereof. The method comprises the following steps of: (1) preparing modified silica micropowder; (2) removing oxygen; (3) preparing a nano iron solution; and (4) preparing nano zerovalent iron particles. In the invention, a liquid-phase reduction method is adopted to prepare the silica micropowder loaded type nano zerovalent iron particles, and a strong reducing agent KBH4 or NaBH4 is used for reducing Fe<3+> to obtain Fe<0>; loading is carried out through the silica micropowder to ensure that the agglomeration resistance of the nano zerovalent iron particle is greatly improved; the prepared nano zerovalent iron particles are uniformly distributed and have small mean grain size and large specific surface area; and the pollutant removal capacity of the nano zerovalent iron particles is far higher than that unloaded nano iron, and the nano zerovalent iron particles have stronger mobility in simulated soil, and can be widely applied to the field of environmental modification.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a silicon micropowder-loaded nanometer zero-valent iron particle and a preparation method thereof. Background technique [0002] Removal of environmental pollutants by using nanometer zero-valent iron reduction has been widely researched and applied at home and abroad in recent years. 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, the preparation methods of nano zero-valent iron particles mainly include gas-phase methods, liquid-phase m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24
Inventor 金朝晖李铁龙李勇超
Owner NANKAI UNIV
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