Details
| Original language | English |
|---|---|
| Pages (from-to) | 2469-2483 |
| Number of pages | 15 |
| Journal | Photochemical and Photobiological Sciences |
| Volume | 18 |
| Issue number | 10 |
| Publication status | Published - Oct 2019 |
Abstract
TiO 2/WO 3 heterojunctions are one of the most investigated systems for photocatalytic applications. However, distinct behavior can be found in the literature depending on the pollutant to be degraded and the photocatalyst preparation conditions. Some authors reported improved photocatalytic activities in relation to TiO 2, while others a deleterious effect. Different factors have been identified to influence the activity of such systems. In this work, a systematic investigation of TiO 2/WO 3 samples with different W/Ti ratios (0-100%) was carried out using different pollutants as targets (gaseous NO, acetaldehyde and aqueous methylene blue solutions). A detailed structural investigation along with transient absorption studies and photoelectrochemical measurements allowed the rationalization of some of the previously reported factors that control the TiO 2/WO 3 photoactivity, i.e. the inability to reduce molecular oxygen, the stabilization of the anatase phase and the adsorption surface properties. The investigations also identified a factor not previously reported: in TiO 2/WO 3 systems, a fraction of long-lived holes do not take part in the interfacial charge transfer to efficient hole quenchers, such as methanol. This behavior seems to be related to the doping of the TiO 2 matrix with W(vi) and plays a key role in the photocatalytic activity.
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Photochemical and Photobiological Sciences, Vol. 18, No. 10, 10.2019, p. 2469-2483.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Unraveling the photocatalytic properties of TiO2/WO3 mixed oxides
AU - Paula, Leonardo F.
AU - Hofer, Moritz
AU - Lacerda, Veronica P. B.
AU - Bahnemann, Detlef
AU - Patrocinio, Antonio Otavio T.
N1 - Funding Information: This work was supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). The authors are also thankful to the Grupo de Materiais Inorgânicos do Triângulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14). A. O. T. P. is thankful to Alexander Von Humboldt Foundation for the fellowship in Germany. D. W. B. acknowledges financial support from Saint Petersburg State University (Research Grant 39054581).
PY - 2019/10
Y1 - 2019/10
N2 - TiO 2/WO 3 heterojunctions are one of the most investigated systems for photocatalytic applications. However, distinct behavior can be found in the literature depending on the pollutant to be degraded and the photocatalyst preparation conditions. Some authors reported improved photocatalytic activities in relation to TiO 2, while others a deleterious effect. Different factors have been identified to influence the activity of such systems. In this work, a systematic investigation of TiO 2/WO 3 samples with different W/Ti ratios (0-100%) was carried out using different pollutants as targets (gaseous NO, acetaldehyde and aqueous methylene blue solutions). A detailed structural investigation along with transient absorption studies and photoelectrochemical measurements allowed the rationalization of some of the previously reported factors that control the TiO 2/WO 3 photoactivity, i.e. the inability to reduce molecular oxygen, the stabilization of the anatase phase and the adsorption surface properties. The investigations also identified a factor not previously reported: in TiO 2/WO 3 systems, a fraction of long-lived holes do not take part in the interfacial charge transfer to efficient hole quenchers, such as methanol. This behavior seems to be related to the doping of the TiO 2 matrix with W(vi) and plays a key role in the photocatalytic activity.
AB - TiO 2/WO 3 heterojunctions are one of the most investigated systems for photocatalytic applications. However, distinct behavior can be found in the literature depending on the pollutant to be degraded and the photocatalyst preparation conditions. Some authors reported improved photocatalytic activities in relation to TiO 2, while others a deleterious effect. Different factors have been identified to influence the activity of such systems. In this work, a systematic investigation of TiO 2/WO 3 samples with different W/Ti ratios (0-100%) was carried out using different pollutants as targets (gaseous NO, acetaldehyde and aqueous methylene blue solutions). A detailed structural investigation along with transient absorption studies and photoelectrochemical measurements allowed the rationalization of some of the previously reported factors that control the TiO 2/WO 3 photoactivity, i.e. the inability to reduce molecular oxygen, the stabilization of the anatase phase and the adsorption surface properties. The investigations also identified a factor not previously reported: in TiO 2/WO 3 systems, a fraction of long-lived holes do not take part in the interfacial charge transfer to efficient hole quenchers, such as methanol. This behavior seems to be related to the doping of the TiO 2 matrix with W(vi) and plays a key role in the photocatalytic activity.
UR - http://www.scopus.com/inward/record.url?scp=85073089724&partnerID=8YFLogxK
U2 - 10.1039/c9pp00163h
DO - 10.1039/c9pp00163h
M3 - Article
VL - 18
SP - 2469
EP - 2483
JO - Photochemical and Photobiological Sciences
JF - Photochemical and Photobiological Sciences
SN - 1474-905X
IS - 10
ER -