Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Titanium oxide (TiO<sub>2</sub>) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst s...

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Main Authors: Byeong Jun Cha, Tae Gyun Woo, Sang Wook Han, Shahid Saqlain, Hyun Ook Seo, Hong Kwan Cho, Jee Yong Kim, Young Dok Kim
Format: Article
Language:English
Published: MDPI AG 2018-10-01
Series:Catalysts
Subjects:
TiO<sub>2</sub>
photocatalysis
toluene
surface deactivation
Online Access:https://www.mdpi.com/2073-4344/8/11/500
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spelling doaj-a8b6796dcd2d4811b7c37ab44fe2777a2020-11-24T20:50:42ZengMDPI AGCatalysts2073-43442018-10-0181150010.3390/catal8110500catal8110500Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of TolueneByeong Jun Cha0Tae Gyun Woo1Sang Wook Han2Shahid Saqlain3Hyun Ook Seo4Hong Kwan Cho5Jee Yong Kim6Young Dok Kim7Department of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaDepartment of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, KoreaSamsung Electronics Co., Ltd., Suwon 16677, KoreaSamsung Electronics Co., Ltd., Suwon 16677, KoreaDepartment of Chemistry, Sungkyunkwan University, Suwon 16419, KoreaTitanium oxide (TiO<sub>2</sub>) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO<sub>2</sub> toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO<sub>2</sub> surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO<sub>2</sub> does not show deactivation under the conditions that induce significant deactivation with bare TiO<sub>2</sub>. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO<sub>2</sub> and did not result in poisoning of active sites. Our hydrophilic TiO<sub>2</sub> shows high potential for application in air purification for extended time, which is not possible using bare TiO<sub>2</sub> due to the significant poisoning of active sites.https://www.mdpi.com/2073-4344/8/11/500TiO<sub>2</sub>photocatalysistoluenesurface deactivation
collection DOAJ
language English
format Article
sources DOAJ
author Byeong Jun Cha
Tae Gyun Woo
Sang Wook Han
Shahid Saqlain
Hyun Ook Seo
Hong Kwan Cho
Jee Yong Kim
Young Dok Kim
spellingShingle Byeong Jun Cha
Tae Gyun Woo
Sang Wook Han
Shahid Saqlain
Hyun Ook Seo
Hong Kwan Cho
Jee Yong Kim
Young Dok Kim
Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
Catalysts
TiO<sub>2</sub>
photocatalysis
toluene
surface deactivation
author_facet Byeong Jun Cha
Tae Gyun Woo
Sang Wook Han
Shahid Saqlain
Hyun Ook Seo
Hong Kwan Cho
Jee Yong Kim
Young Dok Kim
author_sort Byeong Jun Cha
title Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
title_short Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
title_full Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
title_fullStr Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
title_full_unstemmed Surface Modification of TiO<sub>2</sub> for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
title_sort surface modification of tio<sub>2</sub> for obtaining high resistance against poisoning during photocatalytic decomposition of toluene
publisher MDPI AG
series Catalysts
issn 2073-4344
publishDate 2018-10-01
description Titanium oxide (TiO<sub>2</sub>) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO<sub>2</sub> toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO<sub>2</sub> surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO<sub>2</sub> does not show deactivation under the conditions that induce significant deactivation with bare TiO<sub>2</sub>. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO<sub>2</sub> and did not result in poisoning of active sites. Our hydrophilic TiO<sub>2</sub> shows high potential for application in air purification for extended time, which is not possible using bare TiO<sub>2</sub> due to the significant poisoning of active sites.
topic TiO<sub>2</sub>
photocatalysis
toluene
surface deactivation
url https://www.mdpi.com/2073-4344/8/11/500
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