Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced 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, Yan Tai, Kah, Hon Leong, Pichiah, Saravanan, Azrina, Abd Aziz
Format:	Article
Language:	English English
Published:	Springer New York LLC 2017
Subjects:	T Technology (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/1/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight.pdf http://umpir.ump.edu.my/id/eprint/18321/2/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight%201.pdf

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spelling	ump-183212018-01-31T03:17:22Z http://umpir.ump.edu.my/id/eprint/18321/ Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight Jun, Yan Tai Kah, Hon Leong Pichiah, Saravanan Azrina, Abd Aziz T Technology (General) 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 New York LLC 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/18321/1/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/18321/2/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight%201.pdf Jun, Yan Tai and Kah, Hon Leong and Pichiah, Saravanan and Azrina, Abd Aziz (2017) Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight. Journal of Materials Science and Chemical Engineering, 52 (19). pp. 11630-11642. ISSN 2327-6045 (print); 2327-6053 (online) https://link.springer.com/article/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 English
topic	T Technology (General)
spellingShingle	T Technology (General) Jun, Yan Tai Kah, Hon Leong Pichiah, Saravanan Azrina, Abd Aziz Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced 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, Yan Tai Kah, Hon Leong Pichiah, Saravanan Azrina, Abd Aziz
author_facet	Jun, Yan Tai Kah, Hon Leong Pichiah, Saravanan Azrina, Abd Aziz
author_sort	Jun, Yan Tai
title	Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight
title_short	Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight
title_full	Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight
title_fullStr	Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight
title_full_unstemmed	Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight
title_sort	dopant-free oxygen-rich titanium dioxide: led light-induced photocatalysis and mechanism insight
publisher	Springer New York LLC
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/ http://umpir.ump.edu.my/id/eprint/18321/1/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight.pdf http://umpir.ump.edu.my/id/eprint/18321/2/Dopant-free%20oxygen-rich%20titanium%20dioxide-%20LED%20light-induced%20photocatalysis%20and%20mechanism%20insight%201.pdf
first_indexed	2023-09-18T22:25:53Z
last_indexed	2023-09-18T22:25:53Z
_version_	1777415963187085312

Dopant-free Oxygen-rich Titanium Dioxide: LED Light-induced Photocatalysis and Mechanism Insight

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