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Fe3O4/TiO2 nano magnetic composition and in-situ growing preparation method thereof

A nano-magnetic, in-situ growth technology, applied in the direction of nano-magnetism, nano-technology, nano-technology, etc., can solve the problems of impure nano-composite particles, high requirements for equipment, complicated preparation methods, etc., and achieve components and properties Ease of control, energy saving, and the effect of lowering the reaction temperature

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Domestic magnetic nano TiO 2 / Fe 3 o 4 A lot of research has been done on the complex, such as the Chinese invention patent CN101816937, which uses a co-precipitation method to prepare black nano-Fe with better dispersion. 3 o 4 Particles, and then the sol-gel method in the Fe 3 o 4 The surface is coated with a layer of photocatalytic TiO 2 , forming TiO 2 / Fe 3 o 4 Composite materials; the reaction process of this method requires N 2 Gas protection, adding surfactant, complex preparation method, resource consumption
Chinese invention patent CN 102160984 is made by Fe 3 o 4 Nanoparticles and TiO 2 Nanofibers are composited into nanocomposite particles. The preparation process is to uniformly disperse ferric chloride, polyethylene glycol and sodium acetate in tetrabutyl titanate solution to obtain Fe 3 o 4 / TiO 2 Nanocomposite particles; this preparation method requires the addition of surfactants, which are difficult to separate from the reactants and produce Fe 3 o 4 / TiO 2 Nanocomposite particles are impure
Chinese invention patent CN 200610024235 discloses a dispersed phase TiO 2 / SiO 2 A method for preparing nanocomposite particles, the method uses titanium tetrachloride, silicon tetrachloride, oxygen, and air as raw materials, pre-mixes them in a certain volume ratio and adds them to the central ring of a combustion reactor for hydrolysis reaction, and the reaction temperature is 1200- 2500°C; the reaction temperature required by this method is very high, and the requirements for equipment are correspondingly high, and energy is wasted at the same time

Method used

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  • Fe3O4/TiO2 nano magnetic composition and in-situ growing preparation method thereof
  • Fe3O4/TiO2 nano magnetic composition and in-situ growing preparation method thereof
  • Fe3O4/TiO2 nano magnetic composition and in-situ growing preparation method thereof

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preparation example Construction

[0031] The preparation method of the titanium oxide organic matter is:

[0032] (1) Mix 20mL butyl titanate, 20mL acetic anhydride and 50mL cyclohexane evenly, place in a glass container, heat to 70°C, the reaction mixture gradually becomes white turbid; min) centrifugation, and the solid was washed several times with acetone to obtain titanyl organic powder.

Embodiment 1

[0034] (1) Take 50mL of distilled water and heat it to remove the dissolved oxygen, place it in a constant temperature water bath at a constant temperature of 50°C; add 2.98g of FeCl 2 4H 2 O and 8.11 g FeCl 3 ·6H 2 0, at this moment the solution turned yellowish brown, vigorous stirring made the whole reaction system mix evenly;

[0035] (2) Drop an appropriate amount of ammonia water into the mixture under strong stirring, and stop the drop when the pH of the reaction solution is 11; stir at 450rpm for 60 minutes, then ultrasonically disperse for 30 minutes, and centrifugally wash until pH=7 to obtain black Fe 3 o 4 Precipitation, spare.

[0036] (3) Weigh 15.92g of titanyl organic matter into a flask, add 290.5g of 0.5mol / L nitric acid solution at the same time, stir to fully dissolve the titanyl organic matter, and obtain a mixed solution A;

[0037] (4) Fe will be prepared 3 o 4 Precipitate, mix in mixed solution A, stir at 350rpm to disperse the whole system evenl...

Embodiment 2

[0039] (1) Take 50mL of distilled water and heat it to remove the dissolved oxygen, place it in a constant temperature water bath at a constant temperature of 50°C; add 2.98g of FeCl 2 4H 2 O and 8.11 g FeCl 3 ·6H 2 0, at this moment the solution turned yellowish brown, vigorous stirring made the whole reaction system mix evenly;

[0040] (2) Drop an appropriate amount of ammonia water into the mixture under strong stirring, and stop the drop when the pH of the reaction solution is 11; stir at 450rpm for 60 minutes, then ultrasonically disperse for 30 minutes, and centrifugally wash until pH=7 to obtain black Fe 3 o 4 Precipitation, spare.

[0041] (3) Weigh 15.92g of titanyl organic matter into a flask, add 290.5g of 0.5mol / L nitric acid solution at the same time, stir to fully dissolve the titanyl organic matter, and obtain a mixed solution A;

[0042] (4) Fe will be prepared 3 o 4 Precipitate, mix in mixed solution A, stir at 350rpm to disperse the whole system evenl...

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Abstract

The invention discloses a Fe3O4 / TiO2 nano magnetic composition and an in-situ growing preparation method thereof. The method includes the steps: firstly, preparing black nano Fe3O4 particles; and secondly, using an in-situ growing method to prepare nano TiO2 particles, namely dissolving titanyl organic matters into saltpeter solution, adding Fe3O4 particles, performing low-temperature liquid phase synthesis, and coating TiO2 on the surface of Fe3O4 to form a Fe3O4 / TiO2 nano composite in a core-shell structure. The particle size of the composition is about 50nm, and the TiO2 on the surface of the composition which has paramagnetism is in an anatase structure. The Fe3O4 / TiO2 nano magnetic composition and the in-situ growing preparation method thereof are simple in process, easy to control in component and performance, feasible in operation and applicable to industrial production, and the prepared Fe3O4 / TiO2 nano magnetic composition reserves certain magnetism and has certain whiteness as well, so that comprehensive performances of the composition are optimized to meet practical application requirements.

Description

technical field [0001] The invention relates to a preparation method for in-situ growth of a nano-magnetic complex, belonging to the technical field of magnetic nano-materials. Background technique [0002] Magnetic iron oxide (Fe 3 o 4 ) Magnetic nanoparticles are a new type of material developed in recent years. Its unique electrical and magnetic properties make it have broad application prospects in magnetic recording materials, magnetic liquids, biomedicine, permanent magnetic materials and other fields. It has attracted much attention for its excellent properties and wide application potential. However, the appearance color of magnetic iron oxide is black, which limits its application range and application method to a certain extent. Nano-TiO 2 As a new type of inorganic functional material, it is the most widely used nanomaterial at present. It has properties such as large specific surface area, high surface activity, good dispersion, and strong stability. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11C01G23/053B82Y25/00
Inventor 陈小泉张洪鑫邓雪燕
Owner SOUTH CHINA UNIV OF TECH
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