Silver-modified mesoporous TiO 2 photocatalyst for water purification

Silver-modified mesoporous TiO 2 photocatalyst for water purification Mesoporous anatase (TiO 2 ) was modified with silver (Ag) nanoparticles using a photoreduction method. Performance of the resulting TiO 2 –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 TiO 2 surface, which improved electron-hole separation by forming the Schottky barrier at the TiO 2 –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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Research Elsevier

Silver-modified mesoporous TiO 2 photocatalyst for water purification

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Publisher
Elsevier
Copyright
Copyright © 2011 Elsevier Ltd
ISSN
0043-1354
D.O.I.
10.1016/j.watres.2010.12.019
Publisher site
See Article on Publisher Site

Abstract

Mesoporous anatase (TiO 2 ) was modified with silver (Ag) nanoparticles using a photoreduction method. Performance of the resulting TiO 2 –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 TiO 2 surface, which improved electron-hole separation by forming the Schottky barrier at the TiO 2 –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.

Journal

Water ResearchElsevier

Published: Feb 1, 2011

References

  • Silver-modified titanium dioxide thin films for efficient photodegradation of methyl orange
    Arabatzis, I.M.; Stergiopoulos, T.; Bernard, M.C.; Labou, D.; Neophytides, S.G.; Falaras, P.
  • Mesoporous anatase TiO 2 beads with high surface areas and controllable pore sizes: a superior candidate for high-performance dye-sensitized solar cells
    Chen, D.H.; Huang, F.Z.; Cheng, Y.B.; Caruso, R.A.
  • Titanium dioxide nanomaterials: synthesis, properties, modifications, and applications
    Chen, X.; Mao, S.S.
  • Photocatalytic properties of TiO 2 modified with platinum and silver nanoparticles in the degradation of oxalic acid in aqueous solution
    Iliev, V.; Tomova, D.; Bilyarska, L.; Eliyas, A.; Petrov, L.
  • Silver nanoparticles: green synthesis and their antimicrobial activities
    Sharma, V.K.; Yngard, R.A.; Lin, Y.
  • Studies on photokilling of bacteria on TiO 2 thin film
    Sunada, K.; Watanabe, T.; Hashimoto, K.
  • Comparison of Ag deposition effects on the photocatalytic activity of nanoparticulate TiO 2 under visible and UV light irradiation
    Sung-Suh, H.M.; Choi, J.R.; Hah, H.J.; Koo, S.M.; Bae, Y.C.
  • Rational design and applications of highly efficient reaction systems photocatalyzed by noble metal nanoparticle-loaded titanium(IV) dioxide
    Tada, H.; Kiyonaga, T.; Naya, S.
  • Clarifying the role of silver deposits on titania for the photocatalytic mineralisation of organic compounds
    Tran, H.; Scott, J.; Chiang, K.; Amal, R.

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