TY - JOUR
T1 - In situ infrared observation of a photo-decomposition process of organic contaminants on a TiO2 nanotube film surface
AU - Ma, Teng
AU - Kimura, Yasuo
AU - Tadaki, Daisuke
AU - Hirano-Iwata, Ayumi
AU - Niwano, Michio
N1 - Funding Information:
The authors would like to thank Taka-aki Miya and Dr. Ryota Kojima for their technical assistance with the experiments. This research has been partially carried out at the Fundamental Technology Center, Research Institute of Electrical Communication, Tohoku University. This work was partially supported by the CREST program “Development of Atomic or Molecular Two-Dimensional Functional Films and Creation of Fundamental Technologies for Their Applications” (grant JPMJCR14F3) of the Japan Science and Technology Agency (JST). It was also partially supported by JSPS KAKENHI grant Number 18K14120.
Publisher Copyright:
© 2019 The Electrochemical Society.
PY - 2019
Y1 - 2019
N2 - We investigated a photocatalytic reaction on TiO2 nanotube (NT) surfaces using infrared absorption spectroscopy with multiple-reflection geometry (MIR-IRAS). We used an anodization technique to form a film of well-aligned TiO2 NTs on a Si prism used for MIR-IRAS measurements. The photocatalytic decomposition process of the endocrine disruptor, dioctyl phthalate (DOP), on the TiO2 NT surface was monitored in-situ and in real time. We demonstrated that the photocatalytic decomposition of organic materials is promoted with the presence of molecular oxygen. It was observed that the amount of surface-adsorbed water molecules changed during the reaction. We proposed a simple reaction model that can reproduce the time-dependent change of the surface coverage of water and DOP. By comparing the photodecomposition of organic materials on TiO2 NT films with that on TiO2 nanoparticle (NP) films, we showed that TiO2 NT films are superior in photocatalytic reactivity compared to NP films. We suggest that the NT structure provides wider and shorter paths for the transport of photo-generated radicals and byproducts, leading to a higher reactivity compared to TiO2 NPs.
AB - We investigated a photocatalytic reaction on TiO2 nanotube (NT) surfaces using infrared absorption spectroscopy with multiple-reflection geometry (MIR-IRAS). We used an anodization technique to form a film of well-aligned TiO2 NTs on a Si prism used for MIR-IRAS measurements. The photocatalytic decomposition process of the endocrine disruptor, dioctyl phthalate (DOP), on the TiO2 NT surface was monitored in-situ and in real time. We demonstrated that the photocatalytic decomposition of organic materials is promoted with the presence of molecular oxygen. It was observed that the amount of surface-adsorbed water molecules changed during the reaction. We proposed a simple reaction model that can reproduce the time-dependent change of the surface coverage of water and DOP. By comparing the photodecomposition of organic materials on TiO2 NT films with that on TiO2 nanoparticle (NP) films, we showed that TiO2 NT films are superior in photocatalytic reactivity compared to NP films. We suggest that the NT structure provides wider and shorter paths for the transport of photo-generated radicals and byproducts, leading to a higher reactivity compared to TiO2 NPs.
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U2 - 10.1149/2.1151915jes
DO - 10.1149/2.1151915jes
M3 - Article
AN - SCOPUS:85076115726
SN - 0013-4651
VL - 166
SP - H842-H848
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 15
ER -
