Bi2Ti2O7 ceramic powder and preparation method thereof

A technology of ceramic powder and reaction solution, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., which can solve complex reactions, which are not conducive to ensuring single-phase products, etc. problem, to achieve the effect of simple reaction process, excellent photocatalytic performance and low cost

Active Publication Date: 2017-11-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The literature L.Z.Pei, H.D.Liu, N.Lin, HY.Yu.Journal of Alloys and Compounds [J]. Bismuth titanate nanorods and their visible light photocatalytic properties, 2015, 622: 254-261, discloses a hydrothermal method for preparing Bi 2 Ti 2 o 7 Technical solution, but the reaction involved is complicated, and the obtained product has certain heterogeneous phases, which is not conducive to ensuring the single-phase property of the product

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  • Bi2Ti2O7 ceramic powder and preparation method thereof
  • Bi2Ti2O7 ceramic powder and preparation method thereof
  • Bi2Ti2O7 ceramic powder and preparation method thereof

Examples

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Embodiment 1

[0043] A Bi 2 Ti 2 o 7 Ceramic powder, the specific preparation steps are as follows:

[0044] 1) 0.0010mol bismuth citrate powder (C 6 h 5 BiO 7 ) was dissolved in 5mL ammonia water, fully stirred to obtain colorless and transparent mixed solution I;

[0045] 2) 0.0011mol tetrabutyl titanate (C 16 h 36 o 4 Ti) (bismuth / titanium molar ratio is 1:1.1) was added dropwise to the mixed solution I, and the reaction solution II was obtained after stirring;

[0046] 3) After fully stirring the obtained reaction solution II, pour it into the polytetrafluoroethylene liner, and add ammonia, water, and sodium hydroxide to adjust the filling degree of the polytetrafluoroethylene liner to be 80% (volume) and the pH to be 12 to 13; then placed in a hydrothermal reaction kettle, heated to 220°C for 40 hours in a constant temperature drying oven, and then centrifuged and washed several times until the supernatant was neutral. After drying, the described Bi 2 Ti 2 o 7 Ceramic powd...

Embodiment 2

[0049] A Bi 2 Ti 2 o 7 Ceramic powder, the specific preparation steps are as follows:

[0050] 1) 0.0010mol bismuth citrate powder (C 6 h 5 BiO 7 ) was dissolved in 5mL ammonia water, fully stirred to obtain colorless and transparent mixed solution I;

[0051] 2) 0.0012mol tetrabutyl titanate (C 16 h 36 o 4 Ti) (bismuth / titanium molar ratio is 1:1.2) is added dropwise in the mixed solution I, and the reaction solution II is obtained after stirring;

[0052] 3) After fully stirring the obtained reaction solution II, pour it into the polytetrafluoroethylene liner, and add ammonia, water, and sodium hydroxide to adjust the filling degree of the polytetrafluoroethylene liner to be 80% (volume) and the pH to be 12 to 13; then placed in a hydrothermal reaction kettle, heated to 220°C for 72 hours in a constant temperature drying oven, and then centrifuged and washed several times until the supernatant was neutral. After drying, the described Bi 2 Ti 2 o 7 Ceramic powder...

Embodiment 3

[0056] A Bi 2 Ti 2 o 7 Ceramic powder, the specific preparation steps are as follows:

[0057] 1) 0.0010mol bismuth citrate powder (C 6 h 5 BiO 7 ) was dissolved in 5mL ammonia water, fully stirred to obtain colorless and transparent mixed solution I;

[0058] 2) 0.0010mol tetrabutyl titanate (C 16 h 36 o 4 Ti) (bismuth / titanium molar ratio is 1:1) was added dropwise into the mixed solution I, and the reaction solution II was obtained after stirring;

[0059] 3) After fully stirring the obtained reaction solution II, pour it into the polytetrafluoroethylene liner, and add ammonia, water, and sodium hydroxide to adjust the filling degree of the polytetrafluoroethylene liner to be 80% (volume) and the pH to be 12 to 13; then placed in a hydrothermal reaction kettle, heated to 220°C for 96 hours in a constant temperature drying oven, and then centrifuged and washed several times until the supernatant was neutral. After drying, the described Bi 2 Ti 2 o 7 Ceramic powd...

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Abstract

The invention discloses Bi2Ti2O7 ceramic powder and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving bismuth citrate into a proper amount of ammonia water, and sufficiently stirring to obtain a colorless mixed solution; then dropwise adding tetrabutyl titanate into the mixed solution in an inert environment, so as to obtain a reaction solution; carrying out hydrothermal reaction on the reaction solution to prepare the Bi2Ti2O7 powder in one step. The product prepared by the preparation method has high purity, and a crystal shape is octahedral; the product can have excellent photocatalytic performance; the preparation method has the advantages of simplicity, moderate reaction conditions, low cost and good repeatability; requirements on synthesis equipment are low, so that the preparation method is suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramic materials, in particular to a Bi 2 Ti 2 o 7 Ceramic powder and its preparation method. Background technique [0002] Bi since 1965 2 o 3 -TiO 2 Since the discovery of the binary phase diagram of the system, more and more bismuth titanate materials with different crystal structures (composed of three elements Bi-Ti-O, including Bi 4 Ti 3 o 12 、 Bi 2 Ti 4 o 11 、 Bi 2 Ti 2 o 7 、 Bi 8 Ti 2 o 17 、 Bi 12 TiO 20 etc.) have been extensively studied. Some of these materials exhibit excellent properties, such as Bi 2 Ti 4 o 11 It is an antiferroelectric phase at low temperature and transforms into a paraelectric phase at 233°C; Bi 12 TiO 20 Has a good photorefractive effect; Bi 4 Ti 3 o 12 It is a ferroelectric material with a perovskite layered structure (Aurivillius phase), with a Curie temperature of 675°C, a moderate relative dielectric constant (127-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J23/18
CPCB01J23/18B01J35/004C01G29/00C01P2002/36C01P2002/72C01P2004/03C01P2004/41C01P2004/61
Inventor 徐军骆建国
Owner WUHAN INSTITUTE OF TECHNOLOGY
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