TY - JOUR
T1 - Photocatalytic oxidation of thiophene over cerium doped TiO2 thin film
AU - Poo-arporn, Yingyot
AU - Kityakarn, Sutasinee
AU - Niltharach, Anwaraporn
AU - Smith, Michael F.
AU - Seraphin, Supapan
AU - Wörner, Michael
AU - Worayingyong, Attera
N1 - Funding Information:
The authors acknowledge the support from Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand. SK also acknowledges the support from the Center of Advanced Studies for Tropical Natural Resources, Kasetsart University , Bangkok, Thailand.
Funding Information:
The authors acknowledge the support from Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand. SK also acknowledges the support from the Center of Advanced Studies for Tropical Natural Resources, Kasetsart University, Bangkok, Thailand.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/4
Y1 - 2019/4
N2 - Samples of TiO2 and TiO2 doped with 2% and 8% cerium ions were prepared by a sol-gel method and used as photocatalysts for the oxidation of vaporized thiophene. X-ray diffraction patterns showed a mixed phase of anatase and rutile for TiO2, while 2%Ce/TiO2 and 8%Ce/TiO2 were dominated by the anatase phase. As seen in the transmission electron microscopy image, the particle size of Ce/TiO2 was about 10 nm which was smaller than the undoped TiO2. The extended x-rays absorption fine structures revealed the substitutional effect of cerium in the TiO2 structure. Cerium-doped TiO2 exhibited a smaller photocurrent compared to that of TiO2, which suggested the electrons were trapped by cerium ions. In situ diffuse reflectance infrared spectroscopy under UV irradiation and x-ray photoemission spectroscopy were used to investigate the photocatalytic oxidation of thiophene on the prepared catalysts. Doping of cerium ions in TiO2 resulted in an enhanced adsorption of thiophene on the catalyst surface. The oxidation products of carboxylic acid with small amounts of sulfate ions were observed. As seen from the infrared absorption spectrum, 2%Ce/TiO2 and 8%Ce/TiO2 exhibited higher photocatalytic activity than those of the undoped TiO2.
AB - Samples of TiO2 and TiO2 doped with 2% and 8% cerium ions were prepared by a sol-gel method and used as photocatalysts for the oxidation of vaporized thiophene. X-ray diffraction patterns showed a mixed phase of anatase and rutile for TiO2, while 2%Ce/TiO2 and 8%Ce/TiO2 were dominated by the anatase phase. As seen in the transmission electron microscopy image, the particle size of Ce/TiO2 was about 10 nm which was smaller than the undoped TiO2. The extended x-rays absorption fine structures revealed the substitutional effect of cerium in the TiO2 structure. Cerium-doped TiO2 exhibited a smaller photocurrent compared to that of TiO2, which suggested the electrons were trapped by cerium ions. In situ diffuse reflectance infrared spectroscopy under UV irradiation and x-ray photoemission spectroscopy were used to investigate the photocatalytic oxidation of thiophene on the prepared catalysts. Doping of cerium ions in TiO2 resulted in an enhanced adsorption of thiophene on the catalyst surface. The oxidation products of carboxylic acid with small amounts of sulfate ions were observed. As seen from the infrared absorption spectrum, 2%Ce/TiO2 and 8%Ce/TiO2 exhibited higher photocatalytic activity than those of the undoped TiO2.
KW - Cerium
KW - Photocatalysis
KW - Thin film
KW - Thiophene oxidation
KW - Titanium dioxide
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U2 - 10.1016/j.mssp.2018.12.025
DO - 10.1016/j.mssp.2018.12.025
M3 - Article
AN - SCOPUS:85059171359
SN - 1369-8001
VL - 93
SP - 21
EP - 27
JO - Materials Science in Semiconductor Processing
JF - Materials Science in Semiconductor Processing
ER -