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

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

Inactive Publication Date: 2013-05-22
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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  • Solvent-thermal method for preparing single-phase bismuth titanate Bi2Ti2O7

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Embodiment 1

[0033] 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.

[0034] The specific preparation process is as follows: mix a certain amount of glycerol and ethanol, stir and mix thoroughly, add a certain amount of bismuth nitrate solid and dissolve it completely, slowly drop tetrabutyl titanate into the mixture, and stir vigorously After 20min, a certain amount of ether was added, and then the mixed solution was stirred uniformly and then transferred to a 100mL polytetrafluoroethylene-lined reaction kettle; the closed reaction kettle was placed in a constant temperature oven at 110°C for 12h reaction; after cooling, the reaction was The mixture in the kettle was filtered and dried, and the solid was placed in a programmed temperature-controlled furnace, heated at a rate of 2 ...

Embodiment 2

[0037] 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 diethyl ether is 1: 4.7: 11.7: 3.2.

[0038] The specific preparation process is as follows: mix a certain amount of glycerol and ethylene glycol, stir and mix thoroughly, add a certain amount of bismuth nitrate solid and dissolve it completely, and slowly drop tetrabutyl titanate into the mixed solution, After vigorous stirring for 20 min, a certain amount of ether was added, and then the mixed solution was stirred uniformly and then transferred to a 100 mL Teflon-lined reaction kettle; the closed reaction kettle was placed in a constant temperature oven at 110 °C for 12 h; after cooling The mixture in the reaction kettle was filtered and dried, and the solid was placed in a programmed temperature-controlled furnace, heated at a rate...

Embodiment 3

[0041] Single-phase bismuth titanate Bi was prepared in substantially the same manner as in Example 1 2 Ti 2 O 7 , the difference from Example 1 is that 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.

[0042] The X-ray diffraction pattern can confirm that the sample is single-phase Bi 2 Ti 2 O 7 , the particle size of the sample is about 10 nm, 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 prepared single-phase bismuth titanate has excellent photocatalytic degradation activity of organic pollutants under sunlight. Background technique [0002] Bismuth titanate compound is composed of Bi 2 O 3 and TiO 2 The formed complex oxides with various 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, and bismuth-based photocatalysts have aroused great interest of researchers due to their unique electronic structure, excellent visible light absorption ability, and high organic matter degradation ability. Many studies have shown that such compounds...

Claims

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Application Information

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Patent Type & Authority Patents(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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