Novel Photocatalytic and Antibacterial Activities of Three-Dimensional (3D) Polycrystalline Anatase TiO2 Structures

  • Lee, Hyun Uk (Division of Materials Science, Korea Basic Science Institute) ;
  • Yun, Hyung Joong (Division of Materials Science, Korea Basic Science Institute) ;
  • Son, Byoungchul (Jeonju Center, Korea Basic Science Institute) ;
  • Seo, Jung Hye (Division of Materials Science, Korea Basic Science Institute) ;
  • Kim, Hyeran (Division of Materials Science, Korea Basic Science Institute) ;
  • Choi, Saehae (College of Pharmacy, Chungbuk National University) ;
  • Jeon, Cheolho (Division of Materials Science, Korea Basic Science Institute) ;
  • Kim, Hae Jin (Division of Materials Science, Korea Basic Science Institute) ;
  • Lee, Jouhahn (Jeonju Center, Korea Basic Science Institute)
  • Published : 2013.02.18

Abstract

We report three-dimensional polycrystalline anatase TiO2 structures (3D a-TiO2) for environmental and bio-medical applications. The 3D a-TiO2 was synthesized without thermal treatment by the growth of rod-like polycrystals on Degussa P25 (P25) via low temperature (< $85^{\circ}C$) modified alkali hydrothermal processing. X-ray diffraction and high-resolution transmission electron microscopic results showed that the rod-like polycrystals of 3D a-TiO2 possessed the highly anatase nanostructures. The photocatalytic activity of 3D a-TiO2 was found to be 2.2 times higher than that of P25. The recyclability of the 3D a-TiO2 was found to be high: the decolorization rate was 94.8% of the initial value after fifteen cycles. In addition, 3D a-TiO2 exhibited excellent antibacterial activities for the sterilization of gram-negative Escherichia coli (E. coli) and gram-positive Staphylococcus aureus (S. aureus). Even at the 10th recycled use, more than 98.4% of E. coli and S. aureus can be killed. These results indicated that 3D a-TiO2 might have utility in several promising applications such as photocatalytic water/air purification and bactericidal agents.

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