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Solvent-thermal method for preparing single-phase bismuth titanate Bi2Ti2O7

A single-phase bismuth titanate, solvothermal technology, applied in chemical instruments and methods, titanium compounds, physical/chemical process catalysts, etc. The problem of high preparation cost of bismuth can achieve the effect of excellent solar photocatalytic activity, simple preparation process and low cost

Inactive Publication Date: 2012-02-15
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since bismuth oxynitrate precipitates are formed when bismuth nitrate is dissolved in water, it is difficult to form a bismuth titanate precursor; Bi 3+ Radius ratio Ti 4+ Large, hard to access TiO 2 crystal lattice, and the current preparation process is complicated, and the preparation cost of obtaining single-phase bismuth titanate is also relatively high

Method used

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  • Solvent-thermal method for preparing single-phase bismuth titanate Bi2Ti2O7

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Embodiment 1

[0036] Preparation of single-phase bismuth titanate Bi by solvothermal method 2 Ti 2 o 7 method, wherein the molar ratio of bismuth nitrate and tetrabutyl titanate is 0.4:1; the volume ratio of tetrabutyl titanate, glycerol, ethanol and ether is 1: 4.7: 11.7: 3.2.

[0037] The specific preparation process is: mix a certain amount of glycerol and ethanol, stir and mix completely, add a certain amount of bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixed solution, and stir vigorously After 20 minutes, add a certain amount of ether, then stir the mixed solution evenly and transfer it to a 100mL polytetrafluoroethylene-lined reactor; place the closed reactor in a constant temperature oven at 110°C for 12 hours; The mixture in the kettle was filtered and dried, and the solid was placed in a temperature-programmed furnace, and the temperature was raised to 500°C at a rate of 2°C / min for calcination for 3 hours. After cooling, the calcin...

Embodiment 2

[0040] Preparation of single-phase bismuth titanate Bi by solvothermal method 2 Ti 2 o 7 method, wherein the molar ratio of bismuth nitrate and tetrabutyl titanate is 0.4:1; the volume ratio of tetrabutyl titanate, glycerol, ethylene glycol and ether is 1: 4.7: 11.7: 3.2.

[0041] The specific preparation process is as follows: mix a certain amount of glycerol and ethylene glycol, stir and mix completely, add a certain amount of bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixed solution, After stirring vigorously for 20 minutes, add a certain amount of ether, then stir the mixed solution evenly and transfer it to a 100mL polytetrafluoroethylene-lined reactor; place the closed reactor in a constant temperature oven at 110°C for 12 hours; after cooling The mixture in the reactor was filtered and dried, and the solid was placed in a temperature-programmed furnace, and the temperature was raised to 500°C at a rate of 6°C / min for calc...

Embodiment 3

[0044] Prepare single-phase bismuth titanate Bi according to the method substantially identical with embodiment 1 2 Ti 2 o 7 , The difference from Example 1 is: the reaction kettle was placed in a constant temperature oven at 110° C. for 24 hours, and the rest were the same as in Example 1.

[0045] The X-ray diffraction pattern can confirm that the sample is a single-phase Bi 2 Ti 2 o 7 , the particle size of the sample is about 10nm, and the BET specific surface area is 15.6 m 2 / g.

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Abstract

The invention discloses a solvent-thermal method for preparing single-phase bismuth titanate Bi2Ti2O7. Bismuth nitrate and butyl titanate are taken as raw materials, and the method is characterized by comprising the following steps of: dissolving the bismuth nitrate in alcohol serving as a solvent, and adding the butyl titanate and ether, wherein the using amount of the bismuth nitrate is lower than the stoichiometric ratio; uniformly mixing, and reacting at the temperature of between 110 and 230DEG C in an enclosed reaction kettle; and cooling, filtering and drying a solid, and calcining at the temperature of between 450 and 550DEG C to obtain the single-phase Bi2Ti2O7. The prepared bismuth titanate compound has a single-phase structure, is spherical nanoparticles, and has excellent solar photo-catalytic activity. The method has the advantages of low synthesis temperature, high powder purity and the like, the preparation process is simple, the raw materials are readily available, thecost is low, and the equipment is simple, and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of visible light catalysts, and relates to a method for bismuth titanate, in particular to a solvothermal method for preparing single-phase bismuth titanate Bi 2 Ti 2 o 7 The method, the prepared single-phase bismuth titanate has excellent photocatalytic degradation activity of organic pollutants under sunlight. Background technique [0002] Bismuth titanate compounds are composed of Bi 2 o 3 and TiO 2 Formed composite oxides with multiple crystal phase structures, bismuth titanate compounds (Bi 4 Ti 3 o 12 , Bi 2 Ti 2 o 7 , Bi 2 Ti 4 o 11 , Bi 12 TiO 20 , Bi 20 TiO 32 etc.) is a class of functional materials that has been widely concerned in recent years. Bismuth-based photocatalysts have attracted great interest from researchers due to their unique electronic structure, excellent visible light absorption ability and high organic degradation ability. Many studies have shown that this kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B01J23/18
Inventor 王玉萍彭盘英任建坤石倩丁小余
Owner NANJING NORMAL UNIVERSITY
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