Silver-modified mesoporous TiO2 photocatalyst for water purification

Xiong, Zhigang, Ma, Jizhen, Ng, Wun Jern, Waite, T. David and Zhao, X. S. (2011) Silver-modified mesoporous TiO2 photocatalyst for water purification. Water Research, 45 5: 2095-2103. doi:10.1016/j.watres.2010.12.019


Author Xiong, Zhigang
Ma, Jizhen
Ng, Wun Jern
Waite, T. David
Zhao, X. S.
Title Silver-modified mesoporous TiO2 photocatalyst for water purification
Formatted title
Silver-modified mesoporous TiO2 photocatalyst for water purification
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-02
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.watres.2010.12.019
Volume 45
Issue 5
Start page 2095
End page 2103
Total pages 9
Place of publication London, United Kingdom
Publisher IWA Publishing
Collection year 2012
Language eng
Formatted abstract
Mesoporous anatase (TiO2) was modified with silver (Ag) nanoparticles using a photoreduction method. Performance of the resulting TiO2-Ag nanocomposites for water purification was evaluated using degradation of Rhodamine B (RhB) and disinfection of Escherichia coli (E. coli) under ultraviolet (UV) irradiation. The composites with different Ag loadings were characterized using physical adsorption of nitrogen, X-ray diffraction, X-ray photoelectron spectroscopy and UV-Visible diffuse reflectance spectroscopic techniques. The results showed that metallic Ag nanoparticles were firmly immobilized on the TiO2 surface, which improved electron-hole separation by forming the Schottky barrier at the TiO2-Ag interface. Photocatalytic degradation of RhB and inactivation of E. coli effectively occurred in an analogical trend. The deposited Ag slightly decreased adsorption of target pollutants, but greatly increased adsorption of molecular oxygen with the latter enhancing production of reactive oxygen species (ROSs) with concomitant increase in contaminant photodegradation. The optimal Ag loadings for RhB degradation and E. coli disinfection were 0.25 wt% and 2.0 wt%, respectively. The composite photocatalysts were stable and could be used repeatedly under UV irradiation.
Keyword Silver nanoparticles
Mesoporous titanium dioxide
Photocatalysis
Disinfection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ
Additional Notes Available online 24 December 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Non HERDC
 
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