Silver and phosphate functionalized reactive TiO2/polymer composite films for destructions of resistent bacteria using visible light

Ágnes Veres, László Janovák, Tamás Bujdosó, Tamás Rica, Eleonóra Fodor, Szabolcs Tallósy, Norbert Buzás, Erzsébet Nagy, Imre Dékány

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Phosphate and silver co-functionalized TiO2 catalysts were prepared by varying amount of silver (0-1 wt.%) with constant phosphate content (0.25 wt.%). Two methods, the well-know photodeposition and a new simple method, i.e. heterocoagulation, are presented for preparing Ag-TiO2 and the optical, photochemical and photobiological properties of the different samples have been compared. Due to the silver modification, the photocatalysts showed a new Plasmon resonance peak at λmax=455 nm. The photocatalytic efficiencies of the new photocatalysts were studied under UV-A/visible (λ≥ 360 nm) irradiation. Mechanically stable hydrophilic poly(EA-co-MMA) and hydrophobic poly(Bi.A-co-Ech.) based composite films were prepared by spray coating technique. The photocatalytic efficiencies decreased only by ∼ 15% on the hydrophilic and ∼ 63% on the hydrophobic polymer compared to the reference pure photocatalyst films. The antibacterial activity of the films was also studied under visible light (λ≥ 400 nm) irradiation. Methicillin resistant Staphylococcus aureus (MRSA) was used as test bacterium. The best antibacterial activity (90% of bacteria destruction in 15 minutes) could be observed on the Ag-TiO2/p(EA-co-MMA) film.

Original languageEnglish
Pages (from-to)205-216
Number of pages12
JournalJournal of Advanced Oxidation Technologies
Volume15
Issue number1
DOIs
Publication statusPublished - Jan 2012

Keywords

  • Antibacterial
  • Functionalization
  • Nanosilver
  • Phosphorus
  • Polymer
  • Titanium dioxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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