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Preparation method of magnetic TiO2/SiO2/Fe3O4 nanocomposite

A nano-composite material, magnetic technology, applied in the direction of nanotechnology, nanotechnology, inorganic material magnetism, etc., can solve the problems of complex process and large energy consumption, and achieve the effect of good photocatalytic activity

Inactive Publication Date: 2013-11-27
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the existing problem of preparing magnetic TiO 2 / SiO 2 / Fe 3 o 4 Nanocomposite approach exists TiO 2 In the crystal form control process, the required temperature is too high, the process is complicated and the energy consumption is high, and the magnetic TiO 2 / SiO 2 / Fe 3 o 4 Preparation methods of nanocomposites

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  • Preparation method of magnetic TiO2/SiO2/Fe3O4 nanocomposite
  • Preparation method of magnetic TiO2/SiO2/Fe3O4 nanocomposite

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specific Embodiment approach 1

[0015] Specific embodiment 1: Magnetic TiO in this embodiment 2 / SiO 2 / Fe 3 o 4 The preparation method of the nanocomposite material is realized according to the following steps:

[0016] 1. Weigh 0.6~1g FeCl 3 ·6H 2 O, 0.2 ~ 0.4g Na 3 Cit·3H 2 O and 1.3~1.7g NaAc·3H 2 O was dissolved in 25ml of ethylene glycol solution, stirred for 1 hour after the dissolution was complete, then moved to a 50ml hydrothermal reaction kettle, and reacted hydrothermally at 200°C for 10 hours, cooled to room temperature, and the product was magnetically separated, and then separated with water and anhydrous Washed three times with ethanol, then dried at 50°C to obtain Fe 3 o 4 nanoparticles;

[0017] Two, 0.1 ~ 0.2g of Fe obtained in step 1 3 o 4 Nanoparticles, 280ml of absolute ethanol, 70ml of deionized water and 5ml of ammonia water with a concentration of 28wt% were mixed, mechanically stirred after ultrasonic dispersion for 1h, and 4ml of TEOS (tetraethyl orthosilicate) was adde...

specific Embodiment approach 2

[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is that 0.8g FeCl is weighed in step one 3 ·6H 2 O, 0.3g Na 3 Cit·3H 2 O and 1.5 g NaAc 3H 2 O was dissolved in 25ml of ethylene glycol solution. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that 0.15g Fe in step two 3 o 4nanoparticles. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method of a magnetic TiO2 / SiO2 / Fe3O4 nanocomposite and relates to a preparation method of a magnetic nanocomposite. The preparation method provided by the invention is used for solving the problems of high temperature needed in the TiO2 crystal form control process, complex process and high energy consumption of the existing method for preparing the magnetic nanocomposite. The method comprises the following steps of: preparing Fe3O4 nano-particles; preparing SiO2 / Fe3O4 nanocomposite powder; dispersing the two previous materials in benzyl alcohol, stirring, adding TiCl4, washing and drying, thereby finishing preparation of the magnetic TiO2 / SiO2 / Fe3O4 nanocomposite. According to the invention, the magnetic TiO2 / SiO2 / Fe3O4 nanocomposite has a quite complete anatase crystalline phase without heat treatment, and meanwhile the phase inversion temperature can be increased to 700 DEG C, so that the TiO2 photocatalytic composite material can be guaranteed to have good photocatalytic activity, and the crystallization temperature of the TiO2 composite material can be effectively controlled below 300 DEG C. The preparation method provided by the invention plays an active role in some application fields in which the crystal form change of the composite materials needs to be strictly controlled.

Description

technical field [0001] The present invention relates to magnetic TiO 2 / SiO 2 / Fe 3 o 4 Preparation methods of nanocomposites. Background technique [0002] Magnetic TiO 2 / SiO 2 / Fe 3 o 4 It is a kind of TiO with certain magnetic response properties, which can be completed under an external magnetic field. 2 Composite Materials Recycling and Reuse of Nanocomposites. Preparation of TiO due to sol-gel method 2 With the advantages of non-toxic, harmless, mild reaction conditions, etc., it has become the current preparation of magnetic TiO 2 / SiO 2 / Fe 3 o 4 The most commonly used technical method in the nanocomposite process. However, TiO prepared by sol-gel method 2 Usually mixed crystal structure, especially with SiO 2 During the recombination process, SiO 2 will seriously affect the TiO 2 The crystallinity of TiO improves 2 temperature required for crystallization. This is very important for the preparation of magnetic TiO with a certain crystal form, co...

Claims

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Application Information

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IPC IPC(8): C01G49/08C01G23/053C01B33/113H01F1/10B82Y30/00
Inventor 万家峰曹瑞雪刘洋史秉楠
Owner HEILONGJIANG UNIV