In situ ATR-FTIR investigation of the effects of H2O and D2O adsorption on the TiO2 surface

H. Belhadj, Y. Alsalka, P. K.J. Robertson, D. Bahnemann

Research outputpeer-review

3 Citations (Scopus)

Abstract

We have investigated the behavior of H2O and D2O adsorption on TiO2 surfaces in the dark and under UV irradiation using insitu ATR-FTIR spectroscopy. The influence of an electron scavenger (oxygen) and a hole scavenger (ethanol) on the hydroxyl group and/or hydration water behavior on the TiO2 surface were also investigated. Adsorption of H2O-D2O mixtures revealed an isotopic exchange reaction occurring in the dark onto the surface of the TiO2 material. Under UV(A) irradiation, the quanitity of both OH and OD groups was found to be increased by the presence of molecular oxygen. On the other hand, the ATR-FTIR study of the ethanol adsorption in H2O and D2O revealed a stronger adsorption capacity for ethanol compared to both H2O and D2O resulting in molecular and dissociative adsorption of ethanol on the TiO2 surface. When the system was subsequently illuminated with UV(A) light, the surface becomes enriched with adsorbed water. Different possible mechanisms and hypotheses are discussed in terms of the effect of UV irradiation on the TiO2 particle network for the photocatalytic reaction and photoinduced hydrophilicity.

Original languageEnglish
Title of host publicationPhotocatalysts, Photoelectrochemical Cells, and Solar Fuels 7
PublisherThe Electrochemical Society
Pages101-113
Number of pages13
Volume75
Edition50
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Photocatalysts, Photoelectrochemical Cells, and Solar Fuels 7 - PRiME 2016/230th ECS Meeting - Honolulu
Duration: 1 Oct 20166 Oct 2016

Conference

ConferenceSymposium on Photocatalysts, Photoelectrochemical Cells, and Solar Fuels 7 - PRiME 2016/230th ECS Meeting
CountryUnited States
CityHonolulu
Period1/10/166/10/16

Scopus subject areas

  • Engineering(all)

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