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

Hong Rok Kim; Tai Gyu Lee; Yong Gun Shul

doi:10.1016/j.jphotochem.2006.05.027

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

Hong Rok Kim, Tai Gyu Lee, Yong Gun Shul

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	156-160
Number of pages	5
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	185
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jphotochem.2006.05.027
Publication status	Published - 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

Chemistry(all)
Chemical Engineering(all)
Physics and Astronomy(all)

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@article{f244ab1c0e044767af9e298407620a54,

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

abstract = "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.",

author = "Kim, {Hong Rok} and Lee, {Tai Gyu} and Shul, {Yong Gun}",

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).",

year = "2007",

month = jan,

day = "25",

doi = "10.1016/j.jphotochem.2006.05.027",

language = "English",

volume = "185",

pages = "156--160",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

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T1 - Photoluminescence of La/Ti mixed oxides prepared using sol-gel process and their pCBA photodecomposition

AU - Kim, Hong Rok

AU - Lee, Tai Gyu

AU - Shul, Yong Gun

N1 - 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).

PY - 2007/1/25

Y1 - 2007/1/25

N2 - 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.

AB - 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.

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