Photoluminescence of La/Ti mixed oxides prepared using sol-gel process and their pCBA photodecomposition

Hong Rok Kim, Tai Gyu Lee, Yong Gun Shul

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La/Ti mixed oxides with weight ratios of 1:9, 2:8, 3:7, and 4:6 were prepared by sol-gel method. The photocatalytic activity of La/Ti oxides was evaluated based on the pCBA photodecomposition. The catalyst samples were characterized by XRD, TEM, DRS, BET, and photoluminescence (PL) spectra. Particles of the La/Ti-mixed oxides showed the diameter of about 7 nm. We found that 30% doping of lanthanum ions on the TiO2 powders induced the highest pCBA (4-chlorobenzonic acid) photodecomposition in these experimental conditions. The order of its photoactivity was as following: 30 > 20 > 0 > 10 > 40 wt%, which was the same for PL tendency. Also, PL spectra intensity increased with calcination temperature from 500 to 600 °C, then decreased at 700 °C. Phtotcatalytic activity followed the trend of the PL spectra intensity. The modification of TiO2 surface by lanthanum ion made it possible to enhance the photoactivity by retarding the recombination of photoexcited electron/hole pairs, in the result of the higher photoactivity in the stronger PL intensity.

Original languageEnglish
Pages (from-to)156-160
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number2-3
Publication statusPublished - 2007 Jan 25

Bibliographical note

Funding Information:
This work was supported by KRF (R08-2-3-000-10214-0, KRF-2004-003-D00135) and KOSEF through NCRC for Nanomedical Technology (R15-2004-024-00000-0).

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • General Physics and Astronomy


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