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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/18321/1/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
http://umpir.ump.edu.my/id/eprint/18321/
https://link.springer.com/article/10.1007/s10853-017-1334-9
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spelling my.ump.umpir.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
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
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/18321/1/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
http://umpir.ump.edu.my/id/eprint/18321/
https://link.springer.com/article/10.1007/s10853-017-1334-9
_version_ 1643668415372591104
score 13.211869

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