Enhanced photo-catalytic activity of TiO                         2                          films by removal of surface carbon impurities; the role of water vapor

Hyun Ook Seo; Tae Gyun Woo; Eun Ji Park; Byeong Jun Cha; Il Hee Kim; Sang Wook Han; Young Dok Kim

doi:10.1016/j.apsusc.2017.05.223

Enhanced photo-catalytic activity of TiO ₂ films by removal of surface carbon impurities; the role of water vapor

Hyun Ook Seo, Tae Gyun Woo, Eun Ji Park, Byeong Jun Cha, Il Hee Kim, Sang Wook Han, Young Dok Kim

Department of Chemistry

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

10 Scopus citations

Abstract

We have studied the photo-catalytic degradation of acetaldehyde over the surface of TiO ₂ films under UV light (365 nm) irradiation both at dry and humid air conditions using a high vacuum chamber equipped with on-line gas-chromatography as a batch-type reactor. Changes of TiO ₂ surfaces upon the photo-catalysis experiments were studied by X-ray photoelectron spectroscopy. The competitive adsorption of water and acetaldehyde resulted in the reduction of reaction rate of photo-catalytic degradation of acetaldehyde under the UV light irradiation. The photo-catalytic reaction rate of TiO ₂ films towards acetaldehyde mineralization increased when the photo-catalysis experiments were performed repeatedly and it was much more pronounced under humid conditions. Our XPS analysis revealed that carbon impurities on the surface of TiO ₂ films were removed by UV-light driven photo-catalytic mineralization under humid conditions. Water vapor facilitated the photo-catalytic removal of carbon impurities from TiO ₂ surface generating additional active sites of TiO ₂ which resulted in the enhanced photo-catalytic activity of TiO ₂ films.

Original language	English
Pages (from-to)	808-816
Number of pages	9
Journal	Applied Surface Science
Volume	420
DOIs	https://doi.org/10.1016/j.apsusc.2017.05.223
State	Published - 31 Oct 2017

Keywords

Acetaldehyde
Photo-catalysis
TiO
Total oxidation
Water vapor

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Seo, H. O., Woo, T. G., Park, E. J., Cha, B. J., Kim, I. H., Han, S. W., & Kim, Y. D. (2017). Enhanced photo-catalytic activity of TiO ₂ films by removal of surface carbon impurities; the role of water vapor Applied Surface Science, 420, 808-816. https://doi.org/10.1016/j.apsusc.2017.05.223

@article{80ec1dfa79d74ef4b7d4134f9b94f80d,

title = " Enhanced photo-catalytic activity of TiO 2 films by removal of surface carbon impurities; the role of water vapor ",

abstract = " We have studied the photo-catalytic degradation of acetaldehyde over the surface of TiO 2 films under UV light (365 nm) irradiation both at dry and humid air conditions using a high vacuum chamber equipped with on-line gas-chromatography as a batch-type reactor. Changes of TiO 2 surfaces upon the photo-catalysis experiments were studied by X-ray photoelectron spectroscopy. The competitive adsorption of water and acetaldehyde resulted in the reduction of reaction rate of photo-catalytic degradation of acetaldehyde under the UV light irradiation. The photo-catalytic reaction rate of TiO 2 films towards acetaldehyde mineralization increased when the photo-catalysis experiments were performed repeatedly and it was much more pronounced under humid conditions. Our XPS analysis revealed that carbon impurities on the surface of TiO 2 films were removed by UV-light driven photo-catalytic mineralization under humid conditions. Water vapor facilitated the photo-catalytic removal of carbon impurities from TiO 2 surface generating additional active sites of TiO 2 which resulted in the enhanced photo-catalytic activity of TiO 2 films.",

keywords = "Acetaldehyde, Photo-catalysis, TiO, Total oxidation, Water vapor",

author = "Seo, \{Hyun Ook\} and Woo, \{Tae Gyun\} and Park, \{Eun Ji\} and Cha, \{Byeong Jun\} and Kim, \{Il Hee\} and Han, \{Sang Wook\} and Kim, \{Young Dok\}",

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year = "2017",

month = oct,

day = "31",

doi = "10.1016/j.apsusc.2017.05.223",

language = "English",

volume = "420",

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Seo, HO, Woo, TG, Park, EJ, Cha, BJ, Kim, IH, Han, SW & Kim, YD 2017, ' Enhanced photo-catalytic activity of TiO ₂ films by removal of surface carbon impurities; the role of water vapor ', Applied Surface Science, vol. 420, pp. 808-816. https://doi.org/10.1016/j.apsusc.2017.05.223

Enhanced photo-catalytic activity of TiO ₂ films by removal of surface carbon impurities; the role of water vapor . / Seo, Hyun Ook; Woo, Tae Gyun; Park, Eun Ji et al.
In: Applied Surface Science, Vol. 420, 31.10.2017, p. 808-816.

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

TY - JOUR

T1 - Enhanced photo-catalytic activity of TiO 2 films by removal of surface carbon impurities; the role of water vapor

AU - Seo, Hyun Ook

AU - Woo, Tae Gyun

AU - Park, Eun Ji

AU - Cha, Byeong Jun

AU - Kim, Il Hee

AU - Han, Sang Wook

AU - Kim, Young Dok

PY - 2017/10/31

Y1 - 2017/10/31

N2 - We have studied the photo-catalytic degradation of acetaldehyde over the surface of TiO 2 films under UV light (365 nm) irradiation both at dry and humid air conditions using a high vacuum chamber equipped with on-line gas-chromatography as a batch-type reactor. Changes of TiO 2 surfaces upon the photo-catalysis experiments were studied by X-ray photoelectron spectroscopy. The competitive adsorption of water and acetaldehyde resulted in the reduction of reaction rate of photo-catalytic degradation of acetaldehyde under the UV light irradiation. The photo-catalytic reaction rate of TiO 2 films towards acetaldehyde mineralization increased when the photo-catalysis experiments were performed repeatedly and it was much more pronounced under humid conditions. Our XPS analysis revealed that carbon impurities on the surface of TiO 2 films were removed by UV-light driven photo-catalytic mineralization under humid conditions. Water vapor facilitated the photo-catalytic removal of carbon impurities from TiO 2 surface generating additional active sites of TiO 2 which resulted in the enhanced photo-catalytic activity of TiO 2 films.

AB - We have studied the photo-catalytic degradation of acetaldehyde over the surface of TiO 2 films under UV light (365 nm) irradiation both at dry and humid air conditions using a high vacuum chamber equipped with on-line gas-chromatography as a batch-type reactor. Changes of TiO 2 surfaces upon the photo-catalysis experiments were studied by X-ray photoelectron spectroscopy. The competitive adsorption of water and acetaldehyde resulted in the reduction of reaction rate of photo-catalytic degradation of acetaldehyde under the UV light irradiation. The photo-catalytic reaction rate of TiO 2 films towards acetaldehyde mineralization increased when the photo-catalysis experiments were performed repeatedly and it was much more pronounced under humid conditions. Our XPS analysis revealed that carbon impurities on the surface of TiO 2 films were removed by UV-light driven photo-catalytic mineralization under humid conditions. Water vapor facilitated the photo-catalytic removal of carbon impurities from TiO 2 surface generating additional active sites of TiO 2 which resulted in the enhanced photo-catalytic activity of TiO 2 films.

KW - Acetaldehyde

KW - Photo-catalysis

KW - TiO

KW - Total oxidation

KW - Water vapor

UR - https://www.scopus.com/pages/publications/85019993041

U2 - 10.1016/j.apsusc.2017.05.223

DO - 10.1016/j.apsusc.2017.05.223

M3 - Article

AN - SCOPUS:85019993041

SN - 0169-4332

VL - 420

SP - 808

EP - 816

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Enhanced photo-catalytic activity of TiO ₂ films by removal of surface carbon impurities; the role of water vapor

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Keywords

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