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A preparation method of bi4ti3o12 crystal material with micro-nano spherical hierarchical structure

A technology of hierarchical structure and crystalline materials, applied in chemical instruments and methods, inorganic chemistry, titanate, etc., can solve the problems of low sintering activity, dispersion and agglomeration, large powder particle size, etc., to improve the specific surface area and performance. , the effect of easy recycling

Active Publication Date: 2019-05-03
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, Bi prepared by solid phase reaction method 4 Ti 3 o 12 The powder particle size is large and the sintering activity is low, the grain size is too large, the reaction is not complete, and the various components of the raw material are difficult to mix evenly, which affects the Bi to a certain extent. 4 Ti 3 o 12 usage of
The disadvantage of high energy ball milling is that Bi 4 Ti 3 o 12 The particle size distribution is not uniform, it is easy to introduce impurities and the problem of dispersion and agglomeration of powder occurs

Method used

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  • A preparation method of bi4ti3o12 crystal material with micro-nano spherical hierarchical structure
  • A preparation method of bi4ti3o12 crystal material with micro-nano spherical hierarchical structure
  • A preparation method of bi4ti3o12 crystal material with micro-nano spherical hierarchical structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) 3.8g of Bi(NO 3 ) 3 ·5H 2 O dissolved in 25ml of 4mol / L HNO 3 In the solution, after the crystals are dissolved, slowly pour 30ml of ammonia water into the solution to form a white precipitate, which is centrifuged, washed, and dried to obtain Bi(OH) 3 white powder A;

[0024] (2) Add 2ml of Ti(OC 4 h 9 ) 4 Make a mixed solution with 20ml of ethanol, slowly pour 20ml of ammonia water into the mixed solution to form a white precipitate, centrifuge, wash and dry the precipitate to obtain Ti(OH) 4 white powder B;

[0025] (3) Bi(OH) 3 Powder A and Ti(OH) 4 Powder B is weighed according to Bi:Ti molar ratio = 4:3, and added to 40ml of mineralizer NaOH solution (7mol / L) and magnetically stirred evenly. When the color of the solution turns light yellow, add the solution to a 50ml hydrothermal kettle heated at 200°C for 12 hours, centrifuged, washed, and dried to obtain the micro-nano spherical hierarchical structure Bi 4 Ti 3 o 12 Crystal powder.

[0026] f...

Embodiment 2

[0030] (1) 3.8g of Bi(NO 3 ) 3 ·5H 2 O dissolved in 25ml of 4mol / L HNO 3 In the solution, after the crystals are dissolved, slowly pour 30ml of ammonia water into the solution to form a white precipitate, which is centrifuged, washed, and dried to obtain Bi(OH) 3 white powder A;

[0031] (2) Add 2ml of Ti(OC 4 h 9 ) 4 Make a mixed solution with 20ml of ethanol, slowly pour 20ml of ammonia water into the mixed solution to form a white precipitate, centrifuge, wash and dry the precipitate to obtain Ti(OH) 4 white powder B;

[0032] (3) Bi(OH) 3 Powder A and Ti(OH) 4 Powder B is weighed according to Bi:Ti molar ratio = 4:3, and added to 40ml of mineralizer NaOH solution at 5mol / L and magnetically stirred evenly. When the color of the solution turns light yellow, add the solution to a 50ml hydrothermal kettle heated at 200°C for 12 hours, centrifuged, washed, and dried to obtain the micro-nano spherical hierarchical structure Bi 4 Ti 3 o 12 Crystal powder.

[0033] ...

Embodiment 3

[0035] (1) 3.8g of Bi(NO 3 ) 3 ·5H 2 O dissolved in 25ml of 4mol / L HNO 3 In the solution, after the crystals are dissolved, slowly pour 30ml of ammonia water into the solution to form a white precipitate, which is centrifuged, washed, and dried to obtain Bi(OH) 3 white powder A;

[0036] (2) Add 2ml of Ti(OC 4 h 9 ) 4 Make a mixed solution with 20ml of ethanol, slowly pour 20ml of ammonia water into the mixed solution to form a white precipitate, centrifuge, wash and dry the precipitate to obtain Ti(OH) 4 white powder B;

[0037] (3) Bi(OH) 3 Powder A and Ti(OH) 4 Powder B is weighed according to Bi:Ti molar ratio = 4:3, and added to 40ml mineralizer KOH solution of 6mol / L and magnetically stirred evenly. When the color of the solution turns light yellow, add the solution to a 50ml hydrothermal kettle heated at 200°C for 12 hours, centrifuged, washed, and dried to obtain the micro-nano spherical hierarchical structure Bi 4 Ti 3 o 12 Crystal powder.

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Abstract

The invention discloses a micro-nanospherical hierarchical-structure Bi4Ti3O12 crystalline material preparation method, which mainly comprises the following steps of respectively preparing Bi(OH)3 powder A and Ti(OH)4 powder 4, weighing the A and the B according to the molar ratio of Bi to Ti being equal to 4 to 3, adding into a mineralizer with the volume being 40ml and the molar concentration being 5 to 7mol / L, magnetically stirring uniformly, when the solution becomes faint yellow, adding the solution into a 50ml hydrothermal kettle, heating at 200 DEG C for 12h, centrifuging, washing, and drying to obtain micro-nanospherical hierarchical-structure Bi4Ti3O12 crystalline powder. According to the method, the Bi4Ti3O12 spherical powder particles with micron order sizes, monodisperse spherical shapes and favorable crystallization are prepared, and the prepared microballoon spheres with nanoscale concave-convex sheet-like shapes is beneficial for effectively improving the specific surface area of a material and improving the performance of the Bi4Ti3O12 material on photocatalytic degradation of organic matters, and has wider application in the fields of sewage treatment and new energy.

Description

technical field [0001] The present invention relates to Bi 4 Ti 3 o 12 The technical field of crystal material preparation, especially relates to a micro-nano spherical hierarchical structure Bi 4 Ti 3 o 12 Crystal material preparation method. Background technique [0002] Bismuth titanate (Bi 4 Ti 3 o 12 ) as a new type of functional material has good application prospects in non-volatile memory devices and microelectronic devices due to its excellent ferroelectric and high dielectric properties. Due to its excellent photoelectric and electro-optic properties, bismuth titanate has been studied as an optical information processing material, and it exhibits good photocatalytic activity under visible light irradiation. As people pay more and more attention to environmental pollution, bismuth titanate, as a perovskite structure material, has gradually received attention and research in the field of photocatalysis. [0003] At present, the preparation methods of bismut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
CPCC01G23/003C01P2002/72C01P2004/03C01P2004/04C01P2004/45
Inventor 赵巍荣嘉诚刘念奇
Owner TIANJIN CHENGJIAN UNIV