Assessing the photocatalytic activity of europium doped TiO2 using liquid phase plasma process on acetylsalicylic acid

Sang Chul Jung, Hye Jin Bang, Heon Lee, Hyung Ho Ha, Young Hyun Yu, Sun Jae Kim, Young Kwon Park

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this study, europium (Eu) was precipitated in TiO2 powder using liquid phase plasma (LPP) process to prepare a photocatalyst with higher activity, even in the visible light range. Eu was uniformly deposited on the surface of TiO2 by the LPP method. It was observed that the amount of Eu precipitated on the TiO2 surface increased with increasing precursor concentration. XPS and EDS analysis showed that Eu was precipitated as europium oxide. The precipitation of Eu shifted the position of the Raman peak to a higher wavelength; with higher Eu content, the band gap energy decreased. Particularly, the photocatalytic efficiency of the Eu doped TiO2 photocatalyst (EDTP) in the visible light source was much higher than that of bare TiO2, and with higher Eu content, the photocatalytic activity was improved. Acetylsalicylic acid was attacked by HO∙ produced on the EDTP's surface and assumed to be finally mineralized to H2O and CO2 via two decomposition pathways, namely, decarboxylation and deacetylation.

Original languageEnglish
Pages (from-to)365-371
Number of pages7
JournalCatalysis Today
Volume388-389
DOIs
StatePublished - 1 Apr 2022

Keywords

  • Acetylsalicylic acid
  • Degradation mechanism
  • Liquid phase plasma
  • Reaction rate constant
  • TiO photocatalyst

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