Bismuth titanate/bismuth oxide photocatalyst as well as preparation method and application thereof

A photocatalyst, bismuth oxide technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of low photocatalytic activity of pure bismuth oxide, etc. The effect of improving photocatalytic activity, improving catalytic activity, and improving effect

Active Publication Date: 2018-11-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for practical applications, the photocatalytic activity of pure bismuth oxide is not high

Method used

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  • Bismuth titanate/bismuth oxide photocatalyst as well as preparation method and application thereof
  • Bismuth titanate/bismuth oxide photocatalyst as well as preparation method and application thereof
  • Bismuth titanate/bismuth oxide photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0037] The present invention also provides a method for preparing the bismuth titanate / bismuth oxide photocatalyst described in the above technical scheme, comprising the following steps:

[0038] (1) carry out liquid phase precipitation with bismuth nitrate, the γ-Bi that obtains 2 o 3 Roasting to obtain γ-Bi with high crystallinity 2 o 3 carrier;

[0039] (2) the γ-Bi with high degree of crystallinity obtained in the step (1) 2 o 3 The carrier is immersed in the mixed solution and subjected to aging treatment to obtain a photocatalyst precursor; the mixed solution includes bismuth nitrate, titanium salt and polyhydric alcohol solvent;

[0040] (3) The photocatalyst precursor that described step (2) is obtained is carried out drying and roasting treatment successively, obtains bismuth titanate / bismuth oxide photocatalyst;

[0041] The steps (1) and (2) are not limited in sequence.

[0042] In the present invention, bismuth nitrate is subjected to liquid phase precipita...

Embodiment 1

[0088] (1) Dissolve 10 g of bismuth nitrate pentahydrate in 0.5 mol / L dilute nitric acid and stir fully. After the solution is clarified, introduce it into a separatory funnel, and slowly add the solution dropwise into 1 mol / L sodium hydroxide solution. The solution is completely immersed in a water bath, the water bath is 65 ° C, about 20 minutes dropwise, and then reacted for 3 hours, the precipitate is first washed three times with deionized water, then washed twice with absolute ethanol, and then dried at 60 ° C to obtain γ-Bi 2 o 3 ;

[0089] (2) At a temperature of 600°C, the γ-Bi obtained in step (1) 2 o 3 Carry out roasting, roasting 4h, obtain γ-Bi 2 o 3 carrier;

[0090] (3) Dissolve 0.1457g bismuth nitrate pentahydrate in 2mL of a mixed solvent of ethylene glycol and ethanol (the volume ratio of ethylene glycol and ethanol is 3:1), add 0.1278mL tetrabutyl titanate, stir well, and then 1g γ-Bi 2 o 3 The carrier is immersed in this solvent, stirred, and aged ...

Embodiment 2

[0099] (1) Dissolve 10 g of bismuth nitrate pentahydrate in 1 mol / L dilute nitric acid and stir well. After the solution is clarified, introduce it into a separatory funnel, and slowly add the solution dropwise into 1 mol / L sodium hydroxide solution. Completely immerse in a water bath, the water bath is 75°C, add dropwise for about half an hour, then react for 3 hours, wash the precipitate with deionized water three times, then wash twice with absolute ethanol, and then dry it at 60°C to prepare γ-Bi 2 o 3 ;

[0100] (2) At a temperature of 550°C, the γ-Bi obtained in step (1) 2 o 3 Carry out roasting, roasting 2h, obtain γ-Bi 2 o 3 carrier;

[0101] (3) Dissolve 0.1457g of bismuth nitrate pentahydrate in 2mL of ethylene glycol solvent, add 0.298mL of titanium isopropoxide, stir well, and then add 1g of γ-Bi 2 o 3 The carrier is immersed in this solvent, stirred, and aged at room temperature for 24 hours. During this process, bismuth nitrate pentahydrate and titanium i...

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Abstract

The invention provides a bismuth titanate/bismuth oxide photocatalyst and a preparation method thereof. The bismuth titanate/bismuth oxide photocatalyst is prepared from a Bi2Ti2O7 sheet layer and a gamma-Bi2O3 carrier; the Bi2Ti2O7 sheet layer and the gamma-Bi2O3 carrier are perpendicular to each other. According to the bismuth titanate/bismuth oxide photocatalyst, the bismuth oxide and the bismuth titanate can form a type II heterojunction, and the photocatalytic activity of the bismuth titanate/bismuth oxide photocatalyst is improved. The results of examples show that the bismuth titanate/bismuth oxide photocatalyst has a degradation rate of 90% for 4-chlorophenol and a degradation rate of 100% for rhodamine B and methyl orange.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a bismuth titanate / bismuth oxide photocatalyst and a preparation method and application thereof. Background technique [0002] At present, the existence of a large amount of dyes and phenols in wastewater has led to the deterioration of the human living environment. Therefore, in order to improve the environment, the search for excellent sewage treatment technology has attracted widespread attention of researchers. At present, common methods such as physical adsorption have been applied to actual pollution treatment and control, but these methods still have problems such as low purification efficiency, secondary pollution, and large capital consumption. Therefore, in-depth research on more economical and efficient pollution control technologies has become a key research topic in the field of environmental pollution control. [0003] Photocatalytic sewage treatment technology has an...

Claims

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Application Information

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IPC IPC(8): B01J23/18C02F1/30C02F101/34C02F101/30
CPCB01J23/18B01J35/004C02F1/30C02F2101/308C02F2101/345C02F2305/10
Inventor 张静刘东旭陈雪冰李淳
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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