Hydrothermal evolution of PF-co-doped TiO2 nanoparticles and their antibacterial activity against carbapenem-resistant Klebsiella pneumoniae

L. Kõrösi, Balázs Bognár, Marianna Horváth, G. Schneider, János Kovács, Alice Scarpellini, Andrea Castelli, Massimo Colombo, Mirko Prato

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Carbapenem-resistant Klebsiella pneumoniae (CP-Kp) is one of the most important opportunistic pathogens strongly associated with nosocomial infections. The capsule of CP-Kp not only contributes to its pathogenic potential but also ensures survival for bacteria in different environments and surfaces. Development of novel reactive nanomaterials can help to inhibit the survival of such microorganism and thereby their spreading in the hospital environment. In this work, the photocatalytic and antibacterial activities of PF-co-doped anatase TiO2 nanoparticles (NPs) were studied in details and related to the evolution of their structure and surface composition upon hydrothermal treatment at 250 °C for periods up to 12 h. Structural and morphological evolution were followed by X-ray diffraction, transmission electron microscopy while the surface composition was studied by X-ray photoelectron spectroscopy. Electron paramagnetic resonance measurements were carried out to reveal the formation of reactive oxygen species (ROS). Both OH[rad] and O2[rad] radicals as well as 1O2 were confirmed and quantitatively compared in different photoirradiated PF-TiO2 NPs dispersions. It was found that hydrothermal treatment increased the photocatalytic and antibacterial activity while PF-co-doping promoted the formation of OH[rad] radicals. By the application of PF-co-doping, the elevated level of OH[rad] led to rapid inactivation of CP-Kp.

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalApplied Catalysis B: Environmental
Volume231
DOIs
Publication statusPublished - Sep 5 2018

Keywords

  • Antibacterial activity
  • EPR
  • Nonmetal co-doping
  • Photocatalysis
  • TiO

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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