Details
| Original language | English |
|---|---|
| Article number | 118926 |
| Journal | Applied Catalysis A: General |
| Volume | 648 |
| Early online date | 29 Oct 2022 |
| Publication status | Published - 25 Nov 2022 |
Abstract
The photocatalytic activity of different bismuth-based heterojunctions by the reaction rates (dn/dt) and quantum yields (Φλ) in aqueous suspension employing a black body like reactor (BBR), is reported. Four photocatalysts and their heterojunctions were tested while keeping the β-Bi2O3 in common: Cu2O/β-Bi2O3, ZnO/β-Bi2O3, and Na0.5Bi0.5TiO3/β-Bi2O3. The high optical density of the photocatalyst and the negative geometry of the reactor allowed measuring the quantum yields with good reproducibility since the catalyst is the only light absorbing species. The number of photons absorbed by the photocatalysts per unit time (photon flux) was determined by chemical actinometry for UV and visible light. The photocatalytic activity was measured for the oxidation of methanol as a model compound. Formaldehyde was measured as the photooxidation product employing Nash method. The charge transfer process mechanism in the photocatalytic reaction is shown based on the band gap energies, band edge potentials, and band alignment in the case of heterojunctions.
Keywords
- Actinometry, Bismuth-based, Photooxidation, Photoreactor, Quantum yield, Visible light
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemical Engineering(all)
- Process Chemistry and Technology
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In: Applied Catalysis A: General, Vol. 648, 118926, 25.11.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Methanol photooxidation in a black body like reactor using bismuth-based heterojunctions
AU - Ayala Ayala, Maria T.
AU - Dillert, Ralf
AU - Muñoz Saldaña, Juan
AU - Bahnemann, Detlef W.
N1 - Funding Information: The authors thank CONACYT for the financial support for PhD studies, Mobility Scholarship Abroad and funding for project 319478. Special thanks to Barbara Nunes, Carsten Günemann, and Lena Megatif for their technical support during the experimentation and for the discussion. The author MTAA also thanks A. Jimenez for the scanning electron microscopy characterization. This work has been carried out at LUH, CENAPROT, and LIDTRA national laboratories. Financial support from CONACYT doctorate scholarship and mobility scholarship abroad 2019–2020 as well as national laboratories program. Financial support from CINVESTAV Elisa-Acuña scholarship 2019–2020.
PY - 2022/11/25
Y1 - 2022/11/25
N2 - The photocatalytic activity of different bismuth-based heterojunctions by the reaction rates (dn/dt) and quantum yields (Φλ) in aqueous suspension employing a black body like reactor (BBR), is reported. Four photocatalysts and their heterojunctions were tested while keeping the β-Bi2O3 in common: Cu2O/β-Bi2O3, ZnO/β-Bi2O3, and Na0.5Bi0.5TiO3/β-Bi2O3. The high optical density of the photocatalyst and the negative geometry of the reactor allowed measuring the quantum yields with good reproducibility since the catalyst is the only light absorbing species. The number of photons absorbed by the photocatalysts per unit time (photon flux) was determined by chemical actinometry for UV and visible light. The photocatalytic activity was measured for the oxidation of methanol as a model compound. Formaldehyde was measured as the photooxidation product employing Nash method. The charge transfer process mechanism in the photocatalytic reaction is shown based on the band gap energies, band edge potentials, and band alignment in the case of heterojunctions.
AB - The photocatalytic activity of different bismuth-based heterojunctions by the reaction rates (dn/dt) and quantum yields (Φλ) in aqueous suspension employing a black body like reactor (BBR), is reported. Four photocatalysts and their heterojunctions were tested while keeping the β-Bi2O3 in common: Cu2O/β-Bi2O3, ZnO/β-Bi2O3, and Na0.5Bi0.5TiO3/β-Bi2O3. The high optical density of the photocatalyst and the negative geometry of the reactor allowed measuring the quantum yields with good reproducibility since the catalyst is the only light absorbing species. The number of photons absorbed by the photocatalysts per unit time (photon flux) was determined by chemical actinometry for UV and visible light. The photocatalytic activity was measured for the oxidation of methanol as a model compound. Formaldehyde was measured as the photooxidation product employing Nash method. The charge transfer process mechanism in the photocatalytic reaction is shown based on the band gap energies, band edge potentials, and band alignment in the case of heterojunctions.
KW - Actinometry
KW - Bismuth-based
KW - Photooxidation
KW - Photoreactor
KW - Quantum yield
KW - Visible light
UR - http://www.scopus.com/inward/record.url?scp=85142439934&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2022.118926
DO - 10.1016/j.apcata.2022.118926
M3 - Article
AN - SCOPUS:85142439934
VL - 648
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
M1 - 118926
ER -