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Preparation of Bi2WO6 spherical cluster with exposed {010} crystal plane families

A spherical and crystal-faced technology, applied in the field of preparation of Bi2WO6 spherical clusters, can solve the problems of environmental pollution, difficult to completely remove organic additives, and affect product performance, etc., and achieve the effect of improving the adhesion of dyes and improving the catalytic performance of visible light.

Inactive Publication Date: 2014-12-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the morphology of the product can be controlled by using the above methods, it is difficult to completely remove the residual organic additives in the product, which affects the performance of the product to a certain extent
In addition, the acidic or alkaline solution containing organic additives produced in the post-processing process is corrosive and will also cause environmental pollution

Method used

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  • Preparation of Bi2WO6 spherical cluster with exposed {010} crystal plane families
  • Preparation of Bi2WO6 spherical cluster with exposed {010} crystal plane families
  • Preparation of Bi2WO6 spherical cluster with exposed {010} crystal plane families

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 0.97g Bi(NO 3 ) 3 ·5H 2 O dissolved in 10 mL of 1M HNO 3 , magnetically stirred for 60min, then, 0.33g Na 2 WO 4 2H 2 O was dissolved in 10mL deionized water, sonicated for 5min, and Na 2 WO 4 Add all the above Bi(NO 3 ) 3 HNO 3 In the solution, use 2M NaOH to adjust the pH of the mixed solution to 7. Finally, use deionized water to make up the total volume of the solution to 40mL, stir for 10h, then put it into the reaction kettle, heat it in an oven at 160°C for 11h, and Use 100mL deionized water to filter 5 times until the obtained precipitate is washed clean, and then freeze-dry at -50°C to obtain Bi with exposed {010} crystal faces 2 WO 6 spherical clusters. The diameter of the cluster is 2-4 μm, and it is composed of nanosheets with a thickness of about 18 nm.

[0022] The above prepared Bi with exposed {010} facets 2 WO 6 Spherical clusters were tested for visible light degradation of Rhodamine B, in which the dark reaction process was used to char...

Embodiment 2

[0024] The steps and process of this embodiment are the same as in Example 1, except that the time of the hydrothermal reaction is changed from 11h to 7h. Prepared Bi 2 WO 6 The diameter of the spherical cluster is 2-4 μm, and the spherical cluster is formed by stacking nanosheets with an average thickness of 23 nm.

Embodiment 3

[0026] The steps and process of this example are the same as Example 1, except that the temperature of the hydrothermal reaction is changed from 160°C to 180°C, and the time is changed from 11h to 7h. Prepared Bi 2 WO 6The diameter of the spherical cluster is 2-4 μm, and the spherical cluster is stacked by nanosheets with an average thickness of 16 nm.

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Abstract

The invention discloses a preparation method of a Bi2WO6 spherical cluster with exposed {010} crystal plane families. The spherical cluster has a diameter of 2 to 4 microns and consists of Bi2WO6 nanosheets with a thickness of 15 to 30nm. The preparation method of the Bi2WO6 spherical cluster with the exposed {010} crystal plane families comprises the following processes: respectively dissolving Bi(NO3)3<.>5H2O and Na2WO4<.>2H2O into nitric acid and deionized water, wherein the molar ratio of Bi(NO3)3<.>5H2O to Na2WO4<.>2H2O is 2:1; after mixing, regulating pH of the obtained solution into a neutral value; finally, performing the hydrothermal reaction to obtain the Bi2WO6 spherical cluster with the exposed {010} crystal plane families. The preparation method is simple and easy to operate; the reaction is performed in the neutral solution; an organic additive does not need to be added; the prepared Bi2WO6 spherical cluster contains a great quantity of exposed {010} crystal plane families and is beneficial to attachment of dyes in the photocatalysis process and improvement of catalytic performance of visible light.

Description

technical field [0001] The present invention relates to a Bi with exposed {010} crystal plane group 2 WO 6 Method for preparing spherical clusters, belonging to Bi 2 WO 6 Nano-micro-hierarchical structure technology field. Background technique [0002] With the continuous development of society, people are facing more and more threats from environmental pollution and energy shortage. Semiconductor photocatalysts have attracted extensive attention from researchers as a green method to solve such problems. Since visible light accounts for about 43% of the solar spectrum, in order to improve the utilization of sunlight, more and more visible light-responsive photocatalysts stand out. Bi 2 WO 6 As the simplest Oliviers layered oxide, it has a narrow band gap (2.75 eV), can be excited by visible light, and has high catalytic activity under visible light, and is widely used in environmental purification and energy conversion. and other fields. [0003] The catalytic perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02B01J20/06B01J23/31
Inventor 李家俊王佳薇刘恩佐赵乃勤师春生何春年
Owner TIANJIN UNIV
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