Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/115843
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Preparation of a p-n heterojunction BiFeO₃@TiO₂ photocatalyst with a core-shell structure for visible-light photocatalytic degradation |
Other Titles: | Preparation of a p-n heterojunction BiFeO(3)@TiO(2) photocatalyst with a core-shell structure for visible-light photocatalytic degradation |
Author: | Liu, Y. Ding, S. Xu, J. Zhang, H. Yang, S. Duan, X. Sun, H. Wang, S. |
Citation: | Chinese Journal of Catalysis, 2017; 38(6):1052-1062 |
Publisher: | Elsevier BV |
Issue Date: | 2017 |
ISSN: | 1872-2067 1872-2067 |
Statement of Responsibility: | Yazi Liu, Shanshan Ding, Jian Xu, Huayang Zhang, Shaogui Yang, Xiaoguang Duan, Hongqi Sun, Shaobin Wang |
Abstract: | Magnetically separable bismuth ferrite (BiFeO3) nanoparticles were fabricated by a citrate self-combustion method and coated with titanium dioxide (TiO2) by hydrolysis of titanium butoxide (Ti(OBu)4) to form BiFeO3@TiO2 core-shell nanocomposites with different mass ratios of TiO2 to BiFeO3. The photocatalytic performance of the catalysts was comprehensively investigated via photocatalytic oxidation of methyl violet (MV) under both ultraviolet and visible-light irradiation. The BiFeO3@TiO2 samples exhibited better photocatalytic performance than either BiFeO3 or TiO2 alone, and a BiFeO3@TiO2 sample with a mass ratio of 1:1 and TiO2 shell thickness of 50-100 nm showed the highest photo-oxidation activity of the catalysts. The enhanced photocatalytic activity was ascribed to the formation of a p-n junction of BiFeO3 and TiO2 with high charge separation efficiency as well as strong light absorption ability. Photoelectrochemical Mott-Schottky (MS) measurements revealed that both the charge carrier transportation and donor density of BiFeO3 were markedly enhanced after introduction of TiO2. The mechanism of MV degradation is mainly attributed to hydroxyl radicals and photogenerated electrons based on energy band theory and the formation of an internal electrostatic field. In addition, the unique core-shell structure of BiFeO3@TiO2 also promotes charge transfer at the BiFeO3/TiO2 interface by increasing the contact area between BiFeO3 and TiO2. Finally, the photocatalytic activity of BiFeO3@TiO2 was further confirmed by degradation of other industrial dyes under visible-light irradiation. |
Keywords: | Bismuth ferrite; titanium dioxide; core–shell structure; degradation; photocatalysis; visible light |
Description: | Published 5 June 2017 |
Rights: | © 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. |
DOI: | 10.1016/S1872-2067(17)62845-6 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 |
Published version: | http://dx.doi.org/10.1016/s1872-2067(17)62845-6 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.