Bi/Aurivillius type oxide composite material as well as preparation method and application thereof

A technology of composite materials and oxides, which is applied in the field of materials, can solve problems such as uneven distribution of metals and affect material properties, and achieve the effects of improving photocatalytic efficiency, inhibiting recombination, and expanding the range of light absorption

Inactive Publication Date: 2015-06-17
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the above problems, in the prior art, metal doping is often used to improve the catalytic efficiency of semiconductors, and there are three commonly used metal doping methods: (1) doping atoms replace metal atoms in photocatalysts, (2) metal oxide accumulation Around the photocatalyst grains, (3) metal atoms are deposited on the surface of the photocatalyst, but the materials obtained by these three methods all have the problem of uneven metal distribution, which greatly affects the performance of the material. Further improvements are made to obtain materials with better performance

Method used

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  • Bi/Aurivillius type oxide composite material as well as preparation method and application thereof
  • Bi/Aurivillius type oxide composite material as well as preparation method and application thereof
  • Bi/Aurivillius type oxide composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] One-step solvothermal in situ reduction of Bi / Bi 2 WO 6 Composite material, the preparation method is as follows: 1.6866g Bi(NO 3 ) 3 ·5H 2 O and 0.5740 g Na 2 WO 4 2H 2 O was dissolved in 5mL of ethylene glycol respectively, after fully stirring and dissolving, the Na 2 WO 4 The solution was slowly added dropwise to Bi(NO 3 ) 3 Add 20mL ethylene glycol dilution solution to the solution, mix evenly and transfer to a 50mL hydrothermal reaction kettle, react at 220°C for 20h, wait for the reaction kettle to cool down to room temperature naturally, centrifuge and wash, dry at 80°C, grind , get Bi / Bi 2 WO 6 composite material.

[0034] In order to compare the photocatalytic experiments, the pure phase Bi 2 WO 6 powder.

[0035] In addition, in order to compare the photocatalytic experiment, take 100mg of the above pure phase Bi 2 WO 6 The powder was dissolved in Bi(NO 3 ) 3 In the ethylene glycol solution, use excess NaBH 4 Bi in ethylene glycol solution...

Embodiment 2

[0040] One-step solvothermal in situ reduction of Bi / Bi 2 MoO 6 Composite material, the preparation method is as follows: 1.6866g Bi(NO 3 ) 3 ·5H 2 O and 0.4217g Na 2 MoO 4 2H 2 O was respectively dissolved in 5mL of ethylene glycol, and after fully stirring until all the solids were dissolved, the Na 2 MoO 4 The solution was slowly added dropwise to Bi(NO 3 ) 3 Add 20mL ethylene glycol dilution solution to the solution, stir well and transfer to 50mL hydrothermal reaction kettle, react at 170°C for 20h respectively, wait for the reaction kettle to cool down to room temperature naturally, centrifuge and wash, and dry at 80°C 10h, grind to get Bi / Bi 2 MoO 6 composite material.

[0041] In order to compare the photocatalytic experiments, the pure phase Bi 2 MoO 6 powder.

[0042] In addition, in order to compare the photocatalytic experiments, 100 mg of pure phase Bi 2 MoO 6 The powder was dissolved in Bi(NO 3 ) 3 In the ethylene glycol solution, use excess Na...

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Abstract

The invention discloses a Bi / Aurivillius type oxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly weighing soluble bismuth salt and 6 coordinated metal compound according to a mole ratio of (2-2.2) to 1, then dissolving the soluble bismuth salt and the 6 coordinated metal compound in alcohols solvents to prepare corresponding alcohol solutions, then dropwise adding metal coordination compound into an alcohol solution of the bismuth salt, uniformly mixing and subsequently carrying out solvothermal reaction, centrifuging after the reaction is finished, washing and drying to prepare the Bi / Aurivillius type oxide composite material, wherein the metals in the coordinated metal compound is 6-coordinate. The composite material has the special layered structure of the Aurivillius material; the elemental bismuth reduced in situ is uniformly distributed in the layered material of Aurivillius; the electron-cavity separation is improved; the light absorption range of the material is expanded; the photo-catalytic efficiency of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a Bi / Aurivillius type oxide composite material and a preparation method and application thereof. Background technique [0002] In recent years, a series of Bi 2 o 2 (A n-1 B n o 3n+1 ) Aurivillius-type oxides have gradually attracted the attention of researchers, where A is a 12-coordinated metal ion (Ca 2+ ,Sr 2+ , Ba 2+ , Na + , K + , Pb 2+ etc.); B is a 6-coordinated metal ion (W 6+ , Ta 5+ , Nb 5+ , Ti 4+ , Fe 3+ , Ga 3+ Wait). n represents two layers (Bi 2 o 2 ) 2+ The n-layer perovskite structure contained in . These compounds consist of perovskites [A n-1 B n o 3n+1 ] layer and fluorite structure [Bi 2 o 2 ] 2+ Layers are arranged alternately. These Aurivillius-type oxides have excellent piezoelectric, pyroelectric, dielectric, luminescent, ionic conductor, catalytic and other properties, and can be applied in multiferroic-ferroelec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31
Inventor 包淑娟陆世玉于亚楠
Owner SOUTHWEST UNIV
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