Preparation of the titanium dioxide-phosphor composite and its photocatalytic reaction under visible light

Jin Woo Park, Jung Sik Kim

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2 Scopus citations

Abstract

This paper presents a study on the photocatalytic reaction about the composite particles of TiO2-coated phosphors under visible light irradiation. Nanocrystalline titanium dioxide layers were directly coated on the alkaline earth aluminate phosphor, CaAl2O4 : Eu 2,Nd3+ particles by an sol-gel processing method. The photocatalytic reaction was analyzed with the degradation of methylene blue (MB) aqueous solution under UV and visible light irradiations. TiO 2-coated phosphor powders showed different photocatalytic mechanism, compared with pure TiO2 (P-25, Degussa). Under UV-irradiation, TiO2-coated phosphor powders showed slow photocatalytic reactivity in the early stage and fast in the latter, compared with that of pure TiO 2. However, TiO2-coated phosphor powders showed much faster photocatalytic reactivity than that of pure TiO2 under visible irradiation. In addition, the characterizations of the TiO2-coated phosphor powders were conducted by a X-ray diffractometer (XRD), transmission electron microscope (TEM), and energy dispersive spectroscopy (EDS).

Original languageEnglish
Pages (from-to)688-693
Number of pages6
JournalJournal of the Korean Ceramic Society
Volume45
Issue number11
DOIs
StatePublished - Nov 2008

Keywords

  • Ceramic composite
  • Phosphor
  • Photocatalyst
  • Sol-gel processing
  • Titanium dioxide

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