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https://hdl.handle.net/10356/96282
Title: | Highly stable heterostructured Ag–AgBr/TiO2 composite : a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria | Authors: | Wang, Xiaoping Tang, Yuxin Chen, Zhong Lim, Teik-Thye |
Keywords: | DRNTU::Engineering::Environmental engineering | Issue Date: | 2012 | Source: | 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. | Series/Report no.: | Journal of materials chemistry | Abstract: | 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. | URI: | https://hdl.handle.net/10356/96282 http://hdl.handle.net/10220/11567 |
DOI: | 10.1039/c2jm35503e | Rights: | © 2012 The Royal Society of Chemistry. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | CEE Journal Articles |
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