Effect of Erbium on the Photocatalytic Activity of TiO2/Ag Nanocomposites under Visible Light Irradiation

Natarajan Prakash, Rajan Karthikeyan, Dheivasigamani Thangaraju, Mani Navaneethan, Mukannan Arivanandhan, Tadanobu Koyama, Yasuhiro Hayakawa

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Erbium co-doped TiO2/Ag catalysts are synthesized by using a simple, one-step solvothermal method and characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, Raman analysis, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The catalysts exhibit anatase crystal structures with increased visible light absorption compared with pure TiO2. Enhanced photocatalytic activity is observed with Er co-doped TiO2/Ag nanocomposites for Rhodamine B degradation under visible light irradiation. The photocatalytic activity of 1 % Er co-doped TiO2/Ag is much higher than that of TiO2/Ag, TiO2/Er, pure TiO2, and commercial Degussa P25. The kinetics of the degradation process are studied and the pseudo-first-order rate constant (k) and half-life time (t1/2) of the reaction are calculated. The enhanced activity might be accredited to the efficient separation of electron-hole pairs by silver and higher visible light absorption of TiO2 induced by Er.

Original languageEnglish
Pages (from-to)3084-3092
Number of pages9
JournalChemPhysChem
Volume16
Issue number14
DOIs
StatePublished - 1 Oct 2015
Externally publishedYes

Keywords

  • doping
  • nanostructures
  • photocatalysis
  • rare earths
  • titania

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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