Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria

A bifunctional visible-light photocatalyst Ag–AgBr/TiO2 was synthesized by a facile one-pot method. The three-component composite exhibited much superior visible-light photocatalytic activities for ibuprofen (IBP) degradation and mineralization as compared to single-component (TiO2) and two-componen...

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Main Authors: Wang, Xiaoping, Tang, Yuxin, Chen, Zhong, Lim, Teik-Thye
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/96282
http://hdl.handle.net/10220/11567
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-962822020-06-01T10:13:42Z Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria Wang, Xiaoping Tang, Yuxin Chen, Zhong Lim, Teik-Thye School of Civil and Environmental Engineering School of Materials Science & Engineering DRNTU::Engineering::Environmental engineering A bifunctional visible-light photocatalyst Ag–AgBr/TiO2 was synthesized by a facile one-pot method. The three-component composite exhibited much superior visible-light photocatalytic activities for ibuprofen (IBP) degradation and mineralization as compared to single-component (TiO2) and two-component (Ag/TiO2, Ag–AgBr) systems, as well as the conventional Ag–AgBr/P25. After 6 h of white LED irradiation, 81% of organic carbon could be mineralized along with decreased aromaticity and toxicity of the IBP degradation products. Meanwhile, the synthesized Ag–AgBr/TiO2 exhibited much stronger antibacterial activities than TiO2 and conventional Ag–AgBr/P25 under white LED irradiation. More interestingly, the Ag–AgBr/TiO2 had novel antibacterial activities against E. coli in the dark as compared to other Ag–AgBr/semiconductor photocatalysts that have been reported. For the first time, the action spectrum of Ag–AgBr/TiO2 was investigated using different colors of LED to elucidate the roles of Ag nanoparticles and AgBr in its visible-light photocatalytic activity. It reveals that both AgBr and Ag nanoparticles were photoactive species contributing to the high photocatalytic performance. Among the various oxidative species (h+, ˙OH, O2˙− and 1O2), O2˙− was the predominant species involved in IBP degradation upon the Ag–AgBr/TiO2 under white LED irradiation. The visible-light photocatalytic mechanism of Ag–AgBr/TiO2 and factor contributing to its high photostability in water are proposed. 2013-07-16T06:35:46Z 2019-12-06T19:28:09Z 2013-07-16T06:35:46Z 2019-12-06T19:28:09Z 2012 2012 Journal Article Wang, X., Tang, Y., Chen, Z., & Lim, T.-T. (2012). Highly stable heterostructured Ag–AgBr/TiO2 composite: a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria. Journal of Materials Chemistry, 22(43), 23149-23158. https://hdl.handle.net/10356/96282 http://hdl.handle.net/10220/11567 10.1039/c2jm35503e en Journal of materials chemistry © 2012 The Royal Society of Chemistry.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering
spellingShingle DRNTU::Engineering::Environmental engineering
Wang, Xiaoping
Tang, Yuxin
Chen, Zhong
Lim, Teik-Thye
Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
description A bifunctional visible-light photocatalyst Ag–AgBr/TiO2 was synthesized by a facile one-pot method. The three-component composite exhibited much superior visible-light photocatalytic activities for ibuprofen (IBP) degradation and mineralization as compared to single-component (TiO2) and two-component (Ag/TiO2, Ag–AgBr) systems, as well as the conventional Ag–AgBr/P25. After 6 h of white LED irradiation, 81% of organic carbon could be mineralized along with decreased aromaticity and toxicity of the IBP degradation products. Meanwhile, the synthesized Ag–AgBr/TiO2 exhibited much stronger antibacterial activities than TiO2 and conventional Ag–AgBr/P25 under white LED irradiation. More interestingly, the Ag–AgBr/TiO2 had novel antibacterial activities against E. coli in the dark as compared to other Ag–AgBr/semiconductor photocatalysts that have been reported. For the first time, the action spectrum of Ag–AgBr/TiO2 was investigated using different colors of LED to elucidate the roles of Ag nanoparticles and AgBr in its visible-light photocatalytic activity. It reveals that both AgBr and Ag nanoparticles were photoactive species contributing to the high photocatalytic performance. Among the various oxidative species (h+, ˙OH, O2˙− and 1O2), O2˙− was the predominant species involved in IBP degradation upon the Ag–AgBr/TiO2 under white LED irradiation. The visible-light photocatalytic mechanism of Ag–AgBr/TiO2 and factor contributing to its high photostability in water are proposed.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Wang, Xiaoping
Tang, Yuxin
Chen, Zhong
Lim, Teik-Thye
format Article
author Wang, Xiaoping
Tang, Yuxin
Chen, Zhong
Lim, Teik-Thye
author_sort Wang, Xiaoping
title Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
title_short Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
title_full Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
title_fullStr Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
title_full_unstemmed Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
title_sort highly stable heterostructured ag–agbr/tio2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria
publishDate 2013
url https://hdl.handle.net/10356/96282
http://hdl.handle.net/10220/11567
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