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Keywords:

  • antibacterial agents;
  • nanostructures;
  • photocatalysis;
  • selenium;
  • tellurium;
  • titanium dioxide

Abstract

A facile method for the preparation of Te- and Se/Te-doped anatase TiO2 nanorods (NRs) with exposed {100} facets, which provides high photocatalytic and antibacterial activity under irradiation with visible light, is developed. Sodium titanate nanotubes are formed from commercial TiO2 nanoparticles (P25) in NaOH through a hydrothermal reaction. The as-prepared Na-titanate nanotubes are then used to form Te-TiO2 nanotubes in the presence of tellurite (TeO32−) ions and NaBH4. Upon further hydrothermal reaction, the Te-TiO2 nanotubes are transformed to form Te-TiO2 NRs that further form Sen/Te-TiO2 NRs through a reduction of selenite (SeO32−) ions with NaBH4. The Te-TiO2 NRs and Sen/Te-TiO2 NRs have highly active {100} facets and thus provide the photocatalytic activities for the generation of ⋅OH at 2.5 and 4.5 times higher than that of commercial P25, respectively. The Te-TiO2 and Sen/Te-TiO2 NRs exhibit higher antibacterial activities against E. coli and S. aureus than P25 when activated by visible light. These stable and biocompatible Te-TiO2 and Sen/Te-TiO2 NRs hold great potential as potent antibacterial agents.