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Nanometer ferrosilicon composite particle of three-layer nuclear shell structure and preparing method and application thereof

A technology of core-shell structure and composite particles, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, water/sludge/sewage treatment, etc., can solve the problems of inappropriate particle size and high carrier cost, and achieve Easy separation, simple process and simple equipment

Inactive Publication Date: 2013-07-10
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these carriers are expensive or have inappropriate particle sizes

Method used

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  • Nanometer ferrosilicon composite particle of three-layer nuclear shell structure and preparing method and application thereof
  • Nanometer ferrosilicon composite particle of three-layer nuclear shell structure and preparing method and application thereof
  • Nanometer ferrosilicon composite particle of three-layer nuclear shell structure and preparing method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] see figure 1 , is the nano-iron-silicon composite particle SF-Fe with three-layer core-shell structure of the present invention 0 SiO 2 The preparation flow chart. It mainly includes three processes. Firstly, the modified silicon powder is prepared. Through acid modification, the hydroxyl groups on the surface of the silicon powder are strengthened. Secondly, the zero-valent nano-iron is uniformly distributed on the surface of the silicon powder, and then the prepared SF-Fe 0 Dispersed in ethyl orthosilicate solution, by gel-sol method, in SF-Fe 0 The surface is uniformly coated with a layer of SiO 2 , and finally washed with deionized water and absolute ethanol to obtain SF-Fe 0 SiO 2 Composite particles.

[0030] The specific process is as follows.

[0031] (1) Preparation of modified silica powder:

[0032] Prepare a 13g / L silicon micropowder slurry, then add hydrochloric acid solution, adjust the pH to 6.5, settle naturally for 2.5 hours, take the upper laye...

Embodiment 2

[0044] This embodiment is preparing black SF-Fe 0 solution, the reactant uses NaBH 4 Solution replaces KBH in embodiment 1 4 solution, and other steps are the same as in Example 1.

Embodiment 3

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

[0047] Prepare a 13g / L silicon micropowder slurry, then add hydrochloric acid solution, adjust the pH to 6.5, settle naturally for 2.5 hours, take the upper layer slurry, and centrifuge to obtain modified silicon micropowder;

[0048] (2) Deoxygenation:

[0049] Disperse 0.2g modified silica powder in 50ml FeCl 3 In the aqueous alcohol solution, wherein, the volume ratio of alcohol to water is 3:7, so that the molar concentration of iron ions is 0.02mol / L, nitrogen gas is introduced to remove oxygen for 35 minutes, and then mechanically stirred for 15 minutes to mix evenly to obtain a mixed solution;

[0050] (3) Preparation of SF-Fe 0 Solution:

[0051] Add 0.17g KBH dropwise to the mixed solution under mechanical stirring 4 solution, and reacted for 40min to obtain a black nano-iron solution;

[0052] (4) Preparation of SF-Fe 0 particle:

[0053] Separation of the above SF-Fe by magnetic separation 0 particles, and ...

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Abstract

The invention discloses a nanometer ferrosilicon composite particle of a three-layer nuclear shell structure and a preparing method and application thereof. The core of the prepared nanometer ferrosilicon composite particle is a modified silica powder particle with the average particle size to be 90-110nm. The preparing method of the nanometer ferrosilicon composite particle includes that nanometer iron (SF-Fe0) loaded on silica powder is synthesized in an improved liquid phase reduction method, and the particle size of a zero-valent iron particle is 20-60nm; and a SiO2 layer as thick as 5-10nm is evenly wrapped on the outer layer of SF-Fe0 in a gel sol method. The three-layer nuclear shell structure leads the nanometer zero-valent iron particle to have good stability and activity and to be greatly improved in transfer ability in simulation soil. In addition, the preparing method needs simple equipment and is easy and convenient in process, and has good application prospect in aspects of environmental pollution control and the like.

Description

technical field [0001] The invention belongs to the technical field of nano-material preparation and environmental protection engineering, and in particular relates to a nano-iron-silicon composite particle with a three-layer core-shell structure and a preparation method and application thereof. Background technique [0002] Nano-iron particles have a strong ability to remove various pollutants in water bodies, and have been widely used in the field of environmental pollution control. The preparation of nano-iron particles has also attracted extensive attention. However, nano-iron materials have many problems such as poor air stability, easy agglomeration, and high production costs. Moreover, whether nano-iron can reach contaminated areas through underground aquifers is crucial for the removal of pollutants. Classical filtration theory points out that the passage of colloidal particles through porous media such as soil or underground aquifers is mainly affected by Brownian ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24C02F1/28C02F101/22C02F103/06
Inventor 李勇超刘斌全任伯帜
Owner HUNAN UNIV OF SCI & TECH
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