Antibacterial activity of nanocrystalline TiO2(B) on multiresistant klebsiella pneumoniae strains

László Korösi, Dóra Dömötör, Szabolcs Beke, Mirko Prato, Alice Scarpellini, Katalin Meczker, György Schneider, Taḿs Kovács, Árpád Kovács, Szilvia Papp

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Abstract

Nanocrystalline TiO2(B) and bi-crystalline (anatase-TiO2(B)) photocatalysts were prepared through hydrother-mal synthesis by using different Ti-precursors such as titanium(IV) isopropoxide, titanium(IV) chloride and Degussa P25 TiO2. The obtained TiO2 samples were characterized by means of X-ray diffraction, X-ray pho-toelectron spectroscopy, transmission electron microscopy, and N2-sorption measurements. Both the single-phase and bi-crystalline photocatalysts were composed of rod-like, polydisperse nanocrystallites as revealed by electron microscopy analysis. The antibacterial activity of the TiO2 samples was tested against three different Klebsiella pneumoniae strains in aqueous dispersions illuminated by UV-A light. We found that UV-A irradiation Delivered by Publishing Technology to: Elsevier BV itself did not decrease the viable cell number of the bacteria. However, TiO nanorods irradiated with UV-A light exhibited high antibacterial acCtivoiptyyreigvhetn: Ai nmtheericcaanseScoief nthtieficT Pi Ou2b lsi sahmeprsles synthesized under mild reaction conditions without applying any post-annealing step. The photocatalytic activity of the samples was also tested via methyl orange degradation. We found that bi-crystalline anatase-TiO2(B) possessed higher antibacterial and photocatalytic activities than that of single-phase TiO2(B). From these nanostructures, transparent TiO2 thin films of high quality on glass substrates were successfully fabricated by dip-coating method without the use of any additives.

Original languageEnglish
Pages (from-to)1184-1192
Number of pages9
JournalScience of Advanced Materials
Volume5
Issue number9
DOIs
Publication statusPublished - Aug 6 2013

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Keywords

  • Antibacterial activity
  • Hydrothermal synthesis
  • Klebsiella pneumoniae
  • TiO thin films
  • TiO(B)

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Korösi, L., Dömötör, D., Beke, S., Prato, M., Scarpellini, A., Meczker, K., Schneider, G., Kovács, T., Kovács, Á., & Papp, S. (2013). Antibacterial activity of nanocrystalline TiO2(B) on multiresistant klebsiella pneumoniae strains. Science of Advanced Materials, 5(9), 1184-1192. https://doi.org/10.1166/sam.2013.1571