Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight

In this work, we successfully synthesized visible light-responsive oxygen-rich titanium dioxide (O2-TiO2) photocatalysts. Through hydrothermal decomposition of peroxo-titania complex, the in situ generation of oxygen significantly shifted the light absorption toward visible region. The existence and...

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Main Authors:	Jun, Yun Tai, Kah, Hon Leong, Saravanan, Pichiah, Azrina, Abd Aziz, Lan, Ching Sim
Format:	Article
Language:	English
Published:	Springer 2017
Subjects:	QD Chemistry
Online Access:	http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/1/Dopant-free%20oxygen-rich%20titanium%20dioxide1.pdf

id	ump-21887
recordtype	eprints
spelling	ump-218872018-09-05T07:31:44Z http://umpir.ump.edu.my/id/eprint/21887/ Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight Jun, Yun Tai Kah, Hon Leong Saravanan, Pichiah Azrina, Abd Aziz Lan, Ching Sim QD Chemistry In this work, we successfully synthesized visible light-responsive oxygen-rich titanium dioxide (O2-TiO2) photocatalysts. Through hydrothermal decomposition of peroxo-titania complex, the in situ generation of oxygen significantly shifted the light absorption toward visible region. The existence and contribution of oxygen excess defect present in O2-TiO2 was confirmed through FTIR and XPS analysis. The annealing temperature influenced the oxygen content and textural property of O2-TiO2 samples and subsequently their photocatalytic activity. The O2-TiO2 calcined at optimum temperature of 300°C recorded the highest photocatalytic activity toward methylene blue degradation, approximately 7.3- and 3.2-fold higher than that of commercial P25 and anatase TiO2, respectively. The enhancement was attributed to shortening of band gap and low recombination rate of charge carriers when the oxygen content increased at higher temperature. In addition, O2-TiO2 displayed high reusability rate and good catalytic stability after being evaluated by four consecutive catalytic runs. The reactive radical species responsible for charge transfer mechanism and high photocatalytic activity were hydroxyl radical (OH), holes and superoxide radical anions (O2-) after performing multiple scavenging tests. Springer 2017 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/21887/1/Dopant-free%20oxygen-rich%20titanium%20dioxide1.pdf Jun, Yun Tai and Kah, Hon Leong and Saravanan, Pichiah and Azrina, Abd Aziz and Lan, Ching Sim (2017) Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight. Journal of Materials Science, 52 (19). pp. 11630-11642. ISSN 0022-2461 (Print); 1573-4803 (Online) https://doi.org/10.1007/s10853-017-1334-9 doi: 10.1007/s10853-017-1334-9
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Jun, Yun Tai Kah, Hon Leong Saravanan, Pichiah Azrina, Abd Aziz Lan, Ching Sim Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
description	In this work, we successfully synthesized visible light-responsive oxygen-rich titanium dioxide (O2-TiO2) photocatalysts. Through hydrothermal decomposition of peroxo-titania complex, the in situ generation of oxygen significantly shifted the light absorption toward visible region. The existence and contribution of oxygen excess defect present in O2-TiO2 was confirmed through FTIR and XPS analysis. The annealing temperature influenced the oxygen content and textural property of O2-TiO2 samples and subsequently their photocatalytic activity. The O2-TiO2 calcined at optimum temperature of 300°C recorded the highest photocatalytic activity toward methylene blue degradation, approximately 7.3- and 3.2-fold higher than that of commercial P25 and anatase TiO2, respectively. The enhancement was attributed to shortening of band gap and low recombination rate of charge carriers when the oxygen content increased at higher temperature. In addition, O2-TiO2 displayed high reusability rate and good catalytic stability after being evaluated by four consecutive catalytic runs. The reactive radical species responsible for charge transfer mechanism and high photocatalytic activity were hydroxyl radical (OH), holes and superoxide radical anions (O2-) after performing multiple scavenging tests.
format	Article
author	Jun, Yun Tai Kah, Hon Leong Saravanan, Pichiah Azrina, Abd Aziz Lan, Ching Sim
author_facet	Jun, Yun Tai Kah, Hon Leong Saravanan, Pichiah Azrina, Abd Aziz Lan, Ching Sim
author_sort	Jun, Yun Tai
title	Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
title_short	Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
title_full	Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
title_fullStr	Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
title_full_unstemmed	Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight
title_sort	dopant-free oxygen-rich titanium dioxide: led lightinduced photocatalysis and mechanism insight
publisher	Springer
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/ http://umpir.ump.edu.my/id/eprint/21887/1/Dopant-free%20oxygen-rich%20titanium%20dioxide1.pdf
first_indexed	2023-09-18T22:32:19Z
last_indexed	2023-09-18T22:32:19Z
_version_	1777416368098902016

Dopant-free oxygen-rich titanium dioxide: LED lightinduced photocatalysis and mechanism insight

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