The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s Law

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s Law
Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s Law
A series of visible-light-responsive BiOBrxI1-x solid solutions were prepared by a rapid and efficient ultrasonication synthesis and applied in photodegradation of Rhodamine B in aqueous solution. The detailed characterisations showed that the lattice parameters and their band structures of the BiOBrxI1-x solid solutions significantly deviated from the well-established Vegard’s law for solid solution materials. The Mulliken electronegativity and valence band XPS analyses revealed that the substitution of Br by less electronegative iodine can simultaneously modulate the edges of conductance and valence band of the BiOBr, leading to nonlinear dependence of bandgap (Eg) on the halogen anion concentrations. Although the solid solution displayed superior RhB photodegration activity to BiOI, only Br-rich BiOBrxI1-x solid solutions (x>0.5) were more active than BiOBr and BiOI, with the optimal one is BiOBr0.75I0.25. The Br-dependence of bandstructure and photocatalytic activity for the BiOBrxI1-x solid solutions as well as their rate-limiting radical species were also clarified based on experimental and theoretical analyses.
BiOBrxI1-x, solid solution, band edges, visible light photocatalysis
0920-5861
Kong, Liang
52f25214-0f82-43c0-b3c5-a5df74971377
Guo, Junqiu
b2ba3c76-ab0d-470d-9dcc-804dbf2b741b
Makepeace, Joshua W.
343fdc2c-6e91-4e51-a733-ba90756491e2
Xiao, Tiancun
90f7824f-3ff4-4a8e-af42-67a4141ce795
Greer, Heather F.
8738e61e-5f42-40a9-9ab8-39b461d86666
Zhou, Wuzong
5a327e56-a0a2-4b33-b61d-1df2993baaae
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Edwards, Peter P.
b7bc97c4-0100-47c8-be3d-7175c9ca39c5
Kong, Liang
52f25214-0f82-43c0-b3c5-a5df74971377
Guo, Junqiu
b2ba3c76-ab0d-470d-9dcc-804dbf2b741b
Makepeace, Joshua W.
343fdc2c-6e91-4e51-a733-ba90756491e2
Xiao, Tiancun
90f7824f-3ff4-4a8e-af42-67a4141ce795
Greer, Heather F.
8738e61e-5f42-40a9-9ab8-39b461d86666
Zhou, Wuzong
5a327e56-a0a2-4b33-b61d-1df2993baaae
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Edwards, Peter P.
b7bc97c4-0100-47c8-be3d-7175c9ca39c5

Kong, Liang, Guo, Junqiu, Makepeace, Joshua W., Xiao, Tiancun, Greer, Heather F., Zhou, Wuzong, Jiang, Zheng and Edwards, Peter P. (2019) Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s Law. Catalysis Today. (doi:10.1016/j.cattod.2019.02.013).

Record type: Article

Abstract

A series of visible-light-responsive BiOBrxI1-x solid solutions were prepared by a rapid and efficient ultrasonication synthesis and applied in photodegradation of Rhodamine B in aqueous solution. The detailed characterisations showed that the lattice parameters and their band structures of the BiOBrxI1-x solid solutions significantly deviated from the well-established Vegard’s law for solid solution materials. The Mulliken electronegativity and valence band XPS analyses revealed that the substitution of Br by less electronegative iodine can simultaneously modulate the edges of conductance and valence band of the BiOBr, leading to nonlinear dependence of bandgap (Eg) on the halogen anion concentrations. Although the solid solution displayed superior RhB photodegration activity to BiOI, only Br-rich BiOBrxI1-x solid solutions (x>0.5) were more active than BiOBr and BiOI, with the optimal one is BiOBr0.75I0.25. The Br-dependence of bandstructure and photocatalytic activity for the BiOBrxI1-x solid solutions as well as their rate-limiting radical species were also clarified based on experimental and theoretical analyses.

Text
1-s2.0-S0920586118311362-main - Accepted Manuscript
Download (974kB)

More information

Submitted date: 10 December 2018
Accepted/In Press date: 10 February 2019
e-pub ahead of print date: 11 February 2019
Published date: 1 April 2019
Keywords: BiOBrxI1-x, solid solution, band edges, visible light photocatalysis

Identifiers

Local EPrints ID: 428471
URI: http://eprints.soton.ac.uk/id/eprint/428471
ISSN: 0920-5861
PURE UUID: b3737e4a-f653-4492-b243-95132a030605
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

Catalogue record

Date deposited: 28 Feb 2019 17:30
Last modified: 26 Nov 2021 07:10

Export record

Altmetrics

Contributors

Author: Liang Kong
Author: Junqiu Guo
Author: Joshua W. Makepeace
Author: Tiancun Xiao
Author: Heather F. Greer
Author: Wuzong Zhou
Author: Zheng Jiang ORCID iD
Author: Peter P. Edwards

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×