Humidity effect on photocatalytic activity of TiO                         2                          and regeneration of deactivated photocatalysts

Myung Geun Jeong; Eun Ji Park; Hyun Ook Seo; Kwang Dae Kim; Young Dok Kim; Dong Chan Lim

doi:10.1016/j.apsusc.2013.01.155

Humidity effect on photocatalytic activity of TiO ₂ and regeneration of deactivated photocatalysts

Myung Geun Jeong, Eun Ji Park, Hyun Ook Seo, Kwang Dae Kim, Young Dok Kim, Dong Chan Lim

Department of Chemistry

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86 Scopus citations

Abstract

Photocatalytic decomposition of toluene was studied using commercially available TiO ₂ nanocatalysts (Degussa P25) under different ranges of relative humidity (RH). The toluene removal efficiency (sum of toluene adsorption, and partial and total oxidation) decreased with increasing RH, whereas the selectivity to CO ₂ in toluene oxidation enhanced. The enhancement in activity in terms of total oxidation at higher RH led to suppressing deactivation of TiO ₂ with time. On the basis of the humidity effect on photocatalytic reaction, deactivated TiO ₂ catalyst could recover their activity through the regeneration process consisting of exposure of the deactivated catalysts to the UV light under high RH conditions. The regenerated catalysts under high RH showed a higher total oxidation yield of toluene than that of the original catalysts due to the formation of more hydroxyl groups on TiO ₂ surface during the regeneration process.

Original language	English
Pages (from-to)	164-170
Number of pages	7
Journal	Applied Surface Science
Volume	271
DOIs	https://doi.org/10.1016/j.apsusc.2013.01.155
State	Published - 15 Apr 2013

Keywords

Humidity effects
Oxidation
Photocatalysis
Volatile organic compounds

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10.1016/j.apsusc.2013.01.155

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@article{6ce7f007883546a885ff40903cb8710f,

title = " Humidity effect on photocatalytic activity of TiO 2 and regeneration of deactivated photocatalysts ",

abstract = " Photocatalytic decomposition of toluene was studied using commercially available TiO 2 nanocatalysts (Degussa P25) under different ranges of relative humidity (RH). The toluene removal efficiency (sum of toluene adsorption, and partial and total oxidation) decreased with increasing RH, whereas the selectivity to CO 2 in toluene oxidation enhanced. The enhancement in activity in terms of total oxidation at higher RH led to suppressing deactivation of TiO 2 with time. On the basis of the humidity effect on photocatalytic reaction, deactivated TiO 2 catalyst could recover their activity through the regeneration process consisting of exposure of the deactivated catalysts to the UV light under high RH conditions. The regenerated catalysts under high RH showed a higher total oxidation yield of toluene than that of the original catalysts due to the formation of more hydroxyl groups on TiO 2 surface during the regeneration process.",

keywords = "Humidity effects, Oxidation, Photocatalysis, Volatile organic compounds",

author = "Jeong, \{Myung Geun\} and Park, \{Eun Ji\} and Seo, \{Hyun Ook\} and Kim, \{Kwang Dae\} and Kim, \{Young Dok\} and Lim, \{Dong Chan\}",

year = "2013",

month = apr,

day = "15",

doi = "10.1016/j.apsusc.2013.01.155",

language = "English",

volume = "271",

pages = "164--170",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

}

Humidity effect on photocatalytic activity of TiO ₂ and regeneration of deactivated photocatalysts . / Jeong, Myung Geun; Park, Eun Ji; Seo, Hyun Ook et al.
In: Applied Surface Science, Vol. 271, 15.04.2013, p. 164-170.

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

TY - JOUR

T1 - Humidity effect on photocatalytic activity of TiO 2 and regeneration of deactivated photocatalysts

AU - Jeong, Myung Geun

AU - Park, Eun Ji

AU - Seo, Hyun Ook

AU - Kim, Kwang Dae

AU - Kim, Young Dok

AU - Lim, Dong Chan

PY - 2013/4/15

Y1 - 2013/4/15

N2 - Photocatalytic decomposition of toluene was studied using commercially available TiO 2 nanocatalysts (Degussa P25) under different ranges of relative humidity (RH). The toluene removal efficiency (sum of toluene adsorption, and partial and total oxidation) decreased with increasing RH, whereas the selectivity to CO 2 in toluene oxidation enhanced. The enhancement in activity in terms of total oxidation at higher RH led to suppressing deactivation of TiO 2 with time. On the basis of the humidity effect on photocatalytic reaction, deactivated TiO 2 catalyst could recover their activity through the regeneration process consisting of exposure of the deactivated catalysts to the UV light under high RH conditions. The regenerated catalysts under high RH showed a higher total oxidation yield of toluene than that of the original catalysts due to the formation of more hydroxyl groups on TiO 2 surface during the regeneration process.

AB - Photocatalytic decomposition of toluene was studied using commercially available TiO 2 nanocatalysts (Degussa P25) under different ranges of relative humidity (RH). The toluene removal efficiency (sum of toluene adsorption, and partial and total oxidation) decreased with increasing RH, whereas the selectivity to CO 2 in toluene oxidation enhanced. The enhancement in activity in terms of total oxidation at higher RH led to suppressing deactivation of TiO 2 with time. On the basis of the humidity effect on photocatalytic reaction, deactivated TiO 2 catalyst could recover their activity through the regeneration process consisting of exposure of the deactivated catalysts to the UV light under high RH conditions. The regenerated catalysts under high RH showed a higher total oxidation yield of toluene than that of the original catalysts due to the formation of more hydroxyl groups on TiO 2 surface during the regeneration process.

KW - Humidity effects

KW - Oxidation

KW - Photocatalysis

KW - Volatile organic compounds

UR - https://www.scopus.com/pages/publications/84875368534

U2 - 10.1016/j.apsusc.2013.01.155

DO - 10.1016/j.apsusc.2013.01.155

M3 - Article

AN - SCOPUS:84875368534

SN - 0169-4332

VL - 271

SP - 164

EP - 170

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Humidity effect on photocatalytic activity of TiO ₂ and regeneration of deactivated photocatalysts

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Keywords

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