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Method for preparing Pt/Au-BiVO4 Z-type visible-light nanosheet photocatalyst

A photocatalyst, visible light technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve low equipment requirements, high visible light photocatalytic performance, good social and economic effect

Inactive Publication Date: 2017-03-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As far as we know, there is no Pt / Au-BiVO 4 Preparation of Z-type Visible Light Nanosheet Photocatalyst and Improvement of BiVO 4 Photocatalytic Activity and Stability of Photocatalysts Reported

Method used

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  • Method for preparing Pt/Au-BiVO4 Z-type visible-light nanosheet photocatalyst
  • Method for preparing Pt/Au-BiVO4 Z-type visible-light nanosheet photocatalyst
  • Method for preparing Pt/Au-BiVO4 Z-type visible-light nanosheet photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0028] Pt / Au-BiVO 4 The preparation process of Z-type visible light nanosheet photocatalyst is as follows: 1) Au-BiVO 4 The preparation methods of nanosheet photocatalysts are described in literature (Li, R.; Zhang, F.; Wang, D.; Yang, J.; Li, M.; Zhu, J.; Zhou, X.; Han, H.; Li, C. Nature communications 2013, 4, 1432.), where BiVO 4The amount is 0.05g, the concentration of the chloroauric acid aqueous solution is 0.1mol / L, the addition amount of the chloroauric acid aqueous solution is 37.0 μ L, wherein the percentage content of gold is 3%; 2) Pt / Au-BiVO 4 Preparation of nanosheet photocatalyst: take 0.05g of Au-BiVO 4 Ultrasonic dispersion in 80mL 12.5vol% ethanol aqueous solution, add 67μL 0.02mol / L chloroplatinic acid aqueous solution (the percentage content converted into platinum is 0.5%), N 2 After 30 minutes of protection, the system is sealed, and the light intensity is 20mW / cm 2 The 420nm LED lamp was illuminated for 0.5h, and finally the precipitate was washed t...

Embodiment 2

[0041] In order to test the percentage content of platinum on Pt / Au-BiVO 4 Influence of the photocatalytic performance of the composite visible light photocatalyst, in addition to the addition of different amounts of chloroplatinic acid aqueous solution, other reaction conditions such as light intensity (20mW / cm 2 ), the illumination time (0.5h) etc. are all the same as in Example 1, and the results are as follows Figure 8 shown. The result shows that when the addition amount of chloroplatinic acid aqueous solution is 67.0 μ L (the percentage content converted into platinum is 0.5%), the obtained Pt / Au-BiVO 4 The composite visible light photocatalyst has the best photocatalytic performance. The main reason is that when the addition of chloroplatinic acid aqueous solution is less than 67.0 μL (the percentage content of platinum is less than 0.5%), due to the insufficient amount of deposited Pt, in the photocatalytic process, the electron mobility is low, resulting in quantum...

Embodiment 3

[0043] In order to examine the effect of light intensity on Pt / Au-BiVO 4 The impact of the composite visible light photocatalyst Pt deposition situation, except that the light intensity is different, the light time (0.5h), the percentage content of platinum (0.5%) etc. are all the same as in Example 1, and the results are as follows Figure 9 shown. The results show that when the light intensity is less than 20mW / cm 2 When the light intensity is too weak, the amount of Pt deposited in the specified time is too small, so the existence of Pt particles cannot be clearly seen on the Au particles ( Figure 9 a). When the light intensity is greater than 20mW / cm 2 , due to the strong light intensity, the amount of Pt deposited in the specified time is more, so not only the existence of Pt particles can be seen on the Au particles, but also on the BiVO 4 The presence of Pt particles can also be seen on the (110) surface ( Figure 9 c). When the light intensity is greater than 20...

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Abstract

The invention relates to a method for preparing a Pt / Au-BiVO4 Z-type visible-light nanosheet photocatalyst. The method comprises the following steps: ultrasonically dispersing an Au-BiVO4 nanosheet photocatalyst in an ethanol aqueous solution, and forming uniform suspension; adding a chloroplatinic acid aqueous solution into the suspension; further introducing N2 protection and closing the system, and illuminating on an LED lamp; performing alcohol-washing and water-washing on the obtained precipitate, filtering, and performing vacuum drying, so as to obtain the efficient and stable Pt / Au-BiVO4 Z-type visible-light nanosheet photocatalyst. The method disclosed by the invention has the beneficial effects that the synthetic method is easy to operate, and various organic surfactants, additives and the like do not need to be added. Meanwhile, the whole reaction process is low in equipment requirement and has the advantages that the product is easily synthesized on a large scale and the like, and the prepared photocatalytic material has excellent visible-light photocatalytic performance.

Description

technical field [0001] The present invention relates to BiVO 4 Particle Morphology Modification, BiVO 4 Surface modification of particles, specifically involving a highly efficient and stable Pt / Au-BiVO 4 A preparation method of a Z-type visible light nanosheet photocatalyst. Background technique [0002] In recent years, heterogeneous photocatalysis based on semiconductor materials has attracted widespread attention as a new technology to solve environmental pollution and energy crisis economically and efficiently. After decades of research, semiconductor photocatalysis technology has made great progress in solving environmental and energy problems. However, due to the narrow visible light absorption range, low quantum efficiency, and low photocatalytic activity and stability of most of the reported photocatalytic materials, photocatalytic technology has not been widely used. In order to widely apply semiconductor photocatalysis technology, it is urgent to design new ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68
CPCB01J23/682B01J35/39
Inventor 余火根王雪飞李天毅钟威
Owner WUHAN UNIV OF TECH
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