Visible light response of Ag +/TiO 2-Ti 2O 3 prepared by photodeposition under foam fractionation

Shashi Bairagi Atla, Chien Cheng Chen, Chien Yen Chen, Pin Yun Lin, Wei Pan, Kai Chien Cheng, Yuh Ming Huang, Young Fo Chang, Jiin Shuh Jean

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22 Citations (Scopus)


An Ag +/TiO 2-Ti 2O 3 nanocomposite was synthesized by a novel foam fractionation method: the foam traveled to a fixed vertical column and was fractionated. Silver was deposited (0-0.02 mol%) on titania photocatalytic nanoparticles by the foam fractionation method under UV irradiation. By TEM, the Ag particles were found to be highly dispersed on TiO 2 without any aggregation. XPS studies revealed the presence of both the Ti 3+ and Ti 4+ forms, and with an increase in Ag content, Ti 3+ increased. Ag was found mainly in the Ag + state. The obtained Ag-Ti oxides were investigated for photocatalytic activity by the degradation of methylene blue under visible light and sunlight, and the catalytic activity was better under sunlight than under visible light. The activity was found to increase with an increase in Ag loading. The Ag +/TiO 2-Ti 2O 3 obtained by the foam fractionation method was further investigated for bactericidal activity under visible light. Using 0.05 mol% Ag/Ti, the bacterial growth of Escherichia coli was completely inhibited under visible light.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Photochemistry and Photobiology A: Chemistry
Publication statusPublished - 2012 May 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)


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