An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO2 powder surface

Ulick Stafford; Kimberly A. Gray; Prashnat V. Kamat; Arvind Varma

doi:10.1016/0009-2614(93)85166-L

An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO₂ powder surface

Ulick Stafford^*, Kimberly A. Gray, Prashnat V. Kamat, Arvind Varma

^*Corresponding author for this work

Civil and Environmental Engineering

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

155 Scopus citations

Abstract

An in situ FTIR technique has been employed to probe the adsorption and photocatalytic degradation of 4-chlorophenol (4-CP) on TiO₂ particles in a gas/solid system. The chemisorbed 4-CP adsorbed on the TiO₂ surface corresponds to a monolayer. The reaction has been followed under a number of conditions in order to investigate the roles of oxygen and water in the mechanism of 4-CP degradation. The rate of 4-CP disappearance was greatest under an oxygen atmosphere saturated with water and with UV irradiation. Under these conditions hydroquinone (HQ) was observed as a primary reaction intermediate and carbonates as the final product. Transformation of 4-CP to HQ was seen to occur under a variety of reaction conditions (i.e. O₂/UV, N₂/H₂O/UV), but HQ degradation took place only in the presence of oxygen and UV irradiation. These results illustrate that the interactions of 4-CP at the semiconductor surface are complex and suggest that oxygen is intrinsically involved in the degradation reactions.

Original language	English (US)
Pages (from-to)	55-61
Number of pages	7
Journal	Chemical Physics Letters
Volume	205
Issue number	1
DOIs	https://doi.org/10.1016/0009-2614(93)85166-L
State	Published - Apr 2 1993

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

Access to Document

10.1016/0009-2614(93)85166-L

Cite this

@article{b22dae78e92d47b39a023462de1eb771,

title = "An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO2 powder surface",

abstract = "An in situ FTIR technique has been employed to probe the adsorption and photocatalytic degradation of 4-chlorophenol (4-CP) on TiO2 particles in a gas/solid system. The chemisorbed 4-CP adsorbed on the TiO2 surface corresponds to a monolayer. The reaction has been followed under a number of conditions in order to investigate the roles of oxygen and water in the mechanism of 4-CP degradation. The rate of 4-CP disappearance was greatest under an oxygen atmosphere saturated with water and with UV irradiation. Under these conditions hydroquinone (HQ) was observed as a primary reaction intermediate and carbonates as the final product. Transformation of 4-CP to HQ was seen to occur under a variety of reaction conditions (i.e. O2/UV, N2/H2O/UV), but HQ degradation took place only in the presence of oxygen and UV irradiation. These results illustrate that the interactions of 4-CP at the semiconductor surface are complex and suggest that oxygen is intrinsically involved in the degradation reactions.",

author = "Ulick Stafford and Gray, {Kimberly A.} and Kamat, {Prashnat V.} and Arvind Varma",

note = "Funding Information: The authorsg ratefullya cknowledgteh es upporot f NSF (Grant No. BCS91-57948R,A G), andt heO f-",

year = "1993",

month = apr,

day = "2",

doi = "10.1016/0009-2614(93)85166-L",

language = "English (US)",

volume = "205",

pages = "55--61",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier",

number = "1",

}

TY - JOUR

T1 - An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO2 powder surface

AU - Stafford, Ulick

AU - Gray, Kimberly A.

AU - Kamat, Prashnat V.

AU - Varma, Arvind

N1 - Funding Information: The authorsg ratefullya cknowledgteh es upporot f NSF (Grant No. BCS91-57948R,A G), andt heO f-

PY - 1993/4/2

Y1 - 1993/4/2

N2 - An in situ FTIR technique has been employed to probe the adsorption and photocatalytic degradation of 4-chlorophenol (4-CP) on TiO2 particles in a gas/solid system. The chemisorbed 4-CP adsorbed on the TiO2 surface corresponds to a monolayer. The reaction has been followed under a number of conditions in order to investigate the roles of oxygen and water in the mechanism of 4-CP degradation. The rate of 4-CP disappearance was greatest under an oxygen atmosphere saturated with water and with UV irradiation. Under these conditions hydroquinone (HQ) was observed as a primary reaction intermediate and carbonates as the final product. Transformation of 4-CP to HQ was seen to occur under a variety of reaction conditions (i.e. O2/UV, N2/H2O/UV), but HQ degradation took place only in the presence of oxygen and UV irradiation. These results illustrate that the interactions of 4-CP at the semiconductor surface are complex and suggest that oxygen is intrinsically involved in the degradation reactions.

AB - An in situ FTIR technique has been employed to probe the adsorption and photocatalytic degradation of 4-chlorophenol (4-CP) on TiO2 particles in a gas/solid system. The chemisorbed 4-CP adsorbed on the TiO2 surface corresponds to a monolayer. The reaction has been followed under a number of conditions in order to investigate the roles of oxygen and water in the mechanism of 4-CP degradation. The rate of 4-CP disappearance was greatest under an oxygen atmosphere saturated with water and with UV irradiation. Under these conditions hydroquinone (HQ) was observed as a primary reaction intermediate and carbonates as the final product. Transformation of 4-CP to HQ was seen to occur under a variety of reaction conditions (i.e. O2/UV, N2/H2O/UV), but HQ degradation took place only in the presence of oxygen and UV irradiation. These results illustrate that the interactions of 4-CP at the semiconductor surface are complex and suggest that oxygen is intrinsically involved in the degradation reactions.

UR - http://www.scopus.com/inward/record.url?scp=0002422014&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002422014&partnerID=8YFLogxK

U2 - 10.1016/0009-2614(93)85166-L

DO - 10.1016/0009-2614(93)85166-L

M3 - Article

AN - SCOPUS:0002422014

SN - 0009-2614

VL - 205

SP - 55

EP - 61

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 1

ER -

An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO₂ powder surface

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this