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Method for synthesizing porous BiFeO3 nano microcrystal by using P123 assisting sol gel process

A sol-gel method, P123 technology, applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of inadaptability to the concept of green conservation and environmental protection, grain growth, impurity, low efficiency, etc.

Inactive Publication Date: 2010-10-20
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In 2006, Gao Feng et al. from Nanjing University prepared spherical BiFeO with a particle size of 80-120 nm by sol-gel method. 3 Nanoparticles, showing visible light catalytic activity, but with low efficiency, using up to about 9g / L of catalyst, it took 16 hours to degrade a 15mg / L methyl orange solution
BiFeO synthesized by solid phase method and co-precipitation method 3 During the sintering process, the crystallites will inevitably appear, the grains will grow and it is easy to generate impurity phases
However, the traditional sol-gel method is not compatible with the concept of green conservation and environmental protection due to the use of relatively expensive organic salt raw materials and the volatilization of a large amount of toxic substances during the preparation process.

Method used

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  • Method for synthesizing porous BiFeO3 nano microcrystal by using P123 assisting sol gel process
  • Method for synthesizing porous BiFeO3 nano microcrystal by using P123 assisting sol gel process
  • Method for synthesizing porous BiFeO3 nano microcrystal by using P123 assisting sol gel process

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Embodiment

[0018] Embodiment: the preparation process and steps in the present embodiment are as follows:

[0019] (1) Preparation of raw materials: Weigh 4.0400g of analytically pure Fe (NO 3 ) 3 9H 2 O and 4.8507g of analytically pure Bi(NO 3 ) 3 ·5H 2 O is used as a raw material, the two are mixed and placed in a 150ml round bottom flask;

[0020] (2) Preparation of sol: Add 20ml of analytically pure ethylene glycol into the above-mentioned flask as a solvent and a complexing agent, and through magnetic stirring, completely dissolve the inorganic salt raw material to become a uniform mixed solution; add 1ml of analytically pure glacial acetic acid as a stabilizer , put the above solution in an oil bath device, and stir at a constant temperature of 70°C for 30 minutes. At this time, a condensation reflux device should be added to prevent the solution from evaporating too quickly; Stir at constant temperature for 2 hours at ℃ to obtain a maroon sol;

[0021] (3) Formation of gel:...

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Abstract

The invention relates to a method for synthesizing a porous BiFeO3 nano microcrystal by using a P123 assisting sol gel process, belonging to the technical field of preparation processes of inorganic nonmetal materials and semiconductor photocatalysis materials. The method has the key point that the porous BiFeO3 microcrystal is prepared from metal nitrates, including ferric nitrate nonahydrate and bismuth nitrate pentahydrate by adopting a sol gel process and finally sintering at a temperature of 400-600 DEG C in the presence of P122 used as a surface activating agent and a pore-forming agent. The porous BiFeO3 nano microcrystal has larger specific surface area and higher photocatalysis property.

Description

technical field [0001] The invention relates to a P123-assisted sol-gel method for synthesizing porous BiFeO 3 The invention relates to a method for nano-crystals, which belongs to the technical field of preparing inorganic non-metallic materials and semiconductor photocatalytic materials. Background technique [0002] BiFeO 3 It is a perovskite structure material. Due to its trigonal twisted pseudocubic crystal structure, the material exhibits ferroelectricity and ferromagnetism. Previous BiFeO 3 The research of this material mainly focuses on its multiferroic direction. Recently, the application potential of this material in the field of semiconductor photocatalysis has attracted people's attention and has become a new research hotspot. [0003] Photocatalytic technology refers to the use of semiconductor oxide materials to generate photogenerated electron-hole pairs with reduction and oxidation capabilities under light, and to use light energy to effectively photolyze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82B3/00
Inventor 程晋荣宋居岳李建民俞圣雯
Owner SHANGHAI UNIV
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