Method for preparing nano magnetic silicon ball

A nano-magnetic and silicon sphere technology, applied in the direction of inorganic material magnetism, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems that photocatalysts cannot be separated, have no photocatalytic performance, and lose meaning, and achieve the solution of dispersion And the effect of fixing technical problems and promoting practical application

Inactive Publication Date: 2007-03-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

But the magnetic particles involved in this technique are Fe 3 o 4 and γ-Fe 2 o 3 , using these two magnetic particles as a carrier has the following disadvantages: (1) Fe at the nanoscale 3 o 4 Very unstable, it will be rapidly oxidized when exposed to air, so that the photocatalyst cannot be separated by an external magnetic field, and loses its meaning; (2) γ-Fe 2 o 3 The crystal phase is unstable, and when the temperature exceeds 400 ° C, it will rapidly change into non-magnetic α-Fe 2 o 3 , while TiO usually prepared at low temperature 2 They are all amorphous and have no photocatalytic properties. They need to be calcined at 500-600°C to convert them into crystalline TiO. 2 , which will make the composite photocatalyst lose its magnetic properties and lose the meaning of magnetic separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Dissolve nickel nitrate and ferric nitrate in water at a molar ratio of 1:2, add sodium hydroxide solution to adjust the pH to 9.5, and then dilute ferrous chloride with a molar ratio of 1:50 between ferrous and ferric salts. Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 2 hours, filter, wash until neutral, and transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0019] 2. Add surfactant AOT to cyclohexane according to the molar concentration of surfactant at 0.1; add ammonia to cyclohexane at a molar ratio of ammonia to surfactant 9:1; 0.0035 nickel ferrite dispersion was added to cyclohexane, ultrasonically dispersed and vigorously stirred for 30 minutes, and then ethyl orthosilicate was added to cyclohexane according to the mass ratio of nickel ferrite nanoparticles to silicon dioxide 3:20, in stirring at 20° C. for 20 hours, f...

Embodiment 2

[0022] 1. Dissolve nickel nitrate and ferric nitrate in water at a molar ratio of 1:2, add sodium hydroxide solution to adjust the pH to 9.5, and then dilute ferrous chloride with a molar ratio of 1:50 between ferrous and ferric salts. Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 6 hours, filter, wash until neutral, and transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0023] 2. Add surfactant AOT to cyclohexane according to the molar concentration of the surfactant at 0.0001; add ammonia to cyclohexane at a molar ratio of ammonia to surfactant of 1:100; 0.00001 Add the nickel ferrite dispersion to cyclohexane, ultrasonically disperse and stir vigorously for 30 minutes, then add tetraethyl orthosilicate to cyclohexane according to the mass ratio of nickel ferrite nanoparticles to silicon dioxide 10:1, stirring at 20° C. for 20 hours, fi...

Embodiment 3

[0026]1. Dissolve nickel sulfate and ferric nitrate in water at a molar ratio of 2:1, add sodium hydroxide solution to adjust the pH to 9.5, and then dilute ferrous chloride with a molar ratio of 1:50 between ferrous and ferric salts. Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 2 hours, filter, wash until neutral, and transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0027] 2. Add surfactant AOT to cyclohexane according to the molar concentration of surfactant at 100; add ammonia to cyclohexane at a molar ratio of ammonia to surfactant 100:1; 1. Add nickel ferrite dispersion into cyclohexane, ultrasonically disperse and vigorously stir for 30 minutes, then add tetraethyl orthosilicate into cyclohexane according to the mass ratio of nickel ferrite nanoparticles to silicon dioxide 1:500, and stirring at 20° C. for 20 hours, filtering, wa...

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Abstract

The invention is a nano magnetic silicon ball preparing method, applicable to the fields of chemical engineering, environmental protection and biomedicine, firstly selecting bivalent iron salt as catalyst, and by low temperature catalytic phase conversion method, catalytically converting bivalent nickel salt and trivalent iron salt into magnetic nickel ferrite nano particles, dispersing them into reverse micelle solution under the action of surface active agent, coating SiO2 on them by gelatination to form nano magnetic silicon balls, 50nm-sized , where the mass ratio of nickel ferrite nano particle to SiO2 coating is less than 10. And it provides huge surface area for loading of active components in different application fields. And loading TiO2 photocatalyst on the nano magnetic silicon balls can make magnetically separable photocatalyst, able to be effectively used for water treatment.

Description

technical field [0001] The invention relates to a method used in the technical field of environmental protection, in particular to a method for preparing nanometer magnetic silicon spheres. Background technique [0002] Photocatalysis is an emerging technology for environmental purification. Studies in recent years have shown that many refractory pollutants can be significantly removed under the action of photocatalytic oxidation. The photocatalytic oxidation reaction has the following advantages: It can completely mineralize and decompose the pollutants, achieve the purpose of detoxification, decolorization, and deodorization, and will not produce secondary pollution; it can be reacted at normal temperature and pressure. Nano-titanium dioxide powder has been proved to be an efficient, non-toxic and stable photocatalytic material in recent years. It has good photocatalytic activity both in solution and in gas phase reaction. After the titanium dioxide particles are finely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622B01J21/06B01J35/00H01F1/08
Inventor 许士洪上官文峰
Owner SHANGHAI JIAO TONG UNIV
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