Preparation of a Core-Shell-Like TiO.sub.2/Bi.sub.2O.sub.3Heterostructure and Qualitative Analysis of the Function of the Heterojunction Region in the Photocatalytic Process

A core-shell-like heterojunction structure was successfully fabricated on films by coating nanosized Bi2O3 dots with TiO2. By changing the dot density of the Bi.sub.2O.sub.3 dot layer, the effect of the heterojunction size on the photocatalytic performance of the composite film was studied. The morp...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2023-02, Vol.234 (2)
Main Authors: Zhang, Lan, Zhao, Zhengxing, Li, Mingyuan, Ma, Huizhong
Format: Article
Language:English
Subjects:
Analysis
Diffraction
Photoluminescence
Powders
X-ray spectroscopy
X-rays
Online Access:Get full text
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Summary:A core-shell-like heterojunction structure was successfully fabricated on films by coating nanosized Bi2O3 dots with TiO2. By changing the dot density of the Bi.sub.2O.sub.3 dot layer, the effect of the heterojunction size on the photocatalytic performance of the composite film was studied. The morphology, structure, and properties of the samples were investigated via different techniques, such as scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and photoluminescence (PL). The optical transmittance spectra and the photocatalytic degradation capacity of these samples for Rhodamine B (RhB) were determined via ultravioletâvisible (UV) spectroscopy. It was found that the particle size and dot density of Bi.sub.2O.sub.3 dot layer could be regulated by controlling the evaporation rate and evaporation quality of Bi powder. The results showed that the composite film with a greater heterojunction region had a better photocatalytic degradation ability. In addition, the TiO.sub.2/Bi.sub.2O.sub.3 film with a Bi.sub.2O.sub.3 dot density of 20/[micro]m.sup.2 degraded 81.4% RhB in 120 min, which showed improved photocatalytic properties compared to TiO.sub.2 films. The high photocatalytic performance was attributed to the appropriate particle size of the dot layer and the large heterojunction region, which hindered the recombination of electron-hole pairs and provided a greater area for carriers to transfer. This work provides effective results and ideas for the preparation of heterojunction films.
ISSN:0049-6979
DOI:10.1007/s11270-023-06067-4