Improvement of photocatalytic activity of TiO2 coating by the modified sol-gel method

Mayuko Awata, Masahiro Okada, Takayuki Nambu, Naoyuki Matsumoto

Research output: Contribution to journalArticle

Abstract

Photocatalytic TiO2 was coated on a stainless steel (SUS316L) substrate via a sol-gel method at a calcination temperature of 600°C. The sol-gel precursor (titanium isopropoxide) solution was modified by adding crystalline (anatase or rutile) TiO2 particles to control the crystal phase of the TiO2 coated on the substrate. The effect of the number of TiO2 coatings was also evaluated. The TiO2 coating was characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The photocatalytic activity was evaluated from the degradation of methylene blue solution on the TiO2 coating after UV irradiation. The amount of bacteria adhered on the substrate was also evaluated. The TiO2 coating comprising a binary phase (anatase/rutile weight ratio = 4.9/5.1) showed the highest photocatalytic activity, which improved after increasing the number of coatings. The amount of bacteria adhered on each TiO2-coated substrate was not significantly different from that on the uncoated substrate.

Original languageEnglish
Pages (from-to)51-62
Number of pages12
JournalNano Biomedicine
Volume7
Issue number2
Publication statusPublished - 2015

Keywords

  • Anatase
  • Photocatalytic activity
  • Rutile
  • Sol-gel method
  • TiO

ASJC Scopus subject areas

  • Biomedical Engineering

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