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Bi2O3-BiOI heterojunction visible-light response photocatalyst and preparation method thereof

A heterojunction and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low utilization rate of sunlight by photocatalysts, and achieve good visible photoelectric degradation of pollutants performance, increased specific surface area, and good visible-light photoelectrochemical performance

Inactive Publication Date: 2015-03-04
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The energy band gap is wide (anatase TiO2, Eg=3.2eV), and it can only respond to ultraviolet light with a wavelength less than 387nm, and ultraviolet light only accounts for 4-6% of the solar radiation energy reaching the ground, but visible light accounts for solar radiation 45% of the energy, resulting in TiO 2 Photocatalysts have a very low utilization rate of sunlight

Method used

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  • Bi2O3-BiOI heterojunction visible-light response photocatalyst and preparation method thereof
  • Bi2O3-BiOI heterojunction visible-light response photocatalyst and preparation method thereof
  • Bi2O3-BiOI heterojunction visible-light response photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Bi of this embodiment 2 o 3 -BiOI heterojunction visible light-responsive photocatalyst is prepared by the following steps:

[0048] (1) 4g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 20ml ethylene glycol solution, and 0.02molHNO was added 3 (68.0% ~ 70%), magnetically stirred for 20min to form a uniform transparent solution, take 20μl of the solution, apply it on the conductive surface (10mm×10mm) of the conductive substrate, put it in a vacuum drying oven to dry, and put it in a muffle furnace with After heating up to 500°C at 5°C / min, constant temperature annealing treatment for 3h to obtain Bi 2 o 3 film.

[0049] The conductive substrate in this embodiment is FTO glass (fluorine-doped tin oxide). The specification is 10mm×50mm×2mm. Preparation of Bi 2 o 3 For the thin film, the FTO glass was first ultrasonically cleaned with acetone, absolute ethanol and deionized water for 5 minutes, and then taken out to dry.

[0050] Prepared Bi 2 o 3 The surface structur...

Embodiment 2

[0063] Same as Example 1, the difference is that Bi 2 o 3 - During the preparation of the BiOI thin film, the immersion time in solution B (ie, the ion exchange time) was reduced to 30 min.

[0064] Bi prepared under the conditions of this example 2 o 3 - The phenol removal rate of the BiOI film is 60%.

Embodiment 3

[0066] Same as Example 1, the difference is that Bi 2 o 3 -During the preparation of the BiOI thin film, the immersion time in solution B was reduced to 60 min.

[0067] Bi prepared under the conditions of this example 2 o 3 - The phenol removal rate of the BiOI film is 75%.

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Abstract

The invention discloses a Bi2O3-BiOI heterojunction visible-light response photocatalyst and a preparation method thereof. The photocatalyst is of a film structure, and comprises a conductive substrate and a Bi2O3-BiOI heterojunction film positioned on the conductive substrate. The preparation method comprises the following steps: firstly, preparing a Bi2O3 film on the conductive substrate, then putting the Bi2O3 film in an iodide ion solution for ion exchange so as to obtain the Bi2O3-BiOI heterojunction visible-light response photocatalyst. Under the irradiation of sunlight, the photocatalyst disclosed by the invention shows relatively high visible light catalytic activity, and the photoelectrocatalysis degradation effect is relatively good; moreover, photoproduction electron-hole pair compounding is inhibited while transferring of electrons is promoted, and the Bi2O3-BiOI heterojunction visible-light response photocatalyst and the preparation method thereof can be used for degrading environment pollutants by photoelectrocatalysis, photoelectrocatalysis synthesis and hydrogen production through water photolysis.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a Bi 2 o 3 -BiOI heterojunction visible light responsive photocatalyst and preparation method thereof. Background technique [0002] With the increasing energy and environmental problems, it has become an urgent task for human beings to seek efficient and harmless environmentally friendly pollution control technologies. Photocatalytic technology emerged at the historic moment and showed its superior application prospects. Many novel photocatalysts were developed and showed high photocatalytic activity. [0003] TiO was discovered by Pruden and Ollis in 1983 2 The photomineralization of halogenated organic compounds (such as trichlorethylene, dichloromethane, etc.) in the sensitized system made it clear that TiO 2 The photocatalytic degradation function of organic pollutants has created a new field of photocatalytic research on titanium dioxide. In recent years, with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10A62D3/17A62D101/28
Inventor 丛燕青金环姬云王齐张轶
Owner ZHEJIANG GONGSHANG UNIVERSITY
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