Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1909-1925 |
| Seitenumfang | 17 |
| Fachzeitschrift | Journal of Thermal Spray Technology |
| Jahrgang | 32 |
| Ausgabenummer | 7 |
| Frühes Online-Datum | 6 Juli 2023 |
| Publikationsstatus | Veröffentlicht - Okt. 2023 |
Abstract
Visible-light photoactive (Na0.5Bi0.5)TiO3 (NBT)-based heterojunctions have demonstrated their applicability in environmental remediation. The photocatalytic properties of NBT-based coatings are here reported. NBT-based materials were deposited by oxyacetylene flame spray (FS). The physicochemical properties were analyzed as a function of the spraying parameters: fuel/oxygen ratio (F/O), stand-off distance (SOD), and total gas flow (TF). A flame with reducing characteristics promotes the formation of TiO2 (anatase and rutile) and Bi4Ti3O12, while an oxidizing flame results in coatings rich in NBT and Bi4Ti3O12. The SOD mainly influences the degree of crystallinity, which is higher at shorter distances. Optical properties estimated by UV–VIS diffuse reflectance confirmed an increase in light absorption after the FS process, with an E g red shift from 3.32 eV of the NBT powder to 2.63-2.96 eV of the coatings. These values are dependent on the F/O, with a significant E g narrowing under reducing conditions. Photoelectrochemical measurements revealed that faster electron collection is obtained due to the transformations occurring throughout the FS process while still retaining nearly 70 and 88% of the photocurrent density (j ph) at UV and visible light, respectively. These results suggest the great potential of the FS methodology to produce multiphase photocatalytic coatings by tuning the processing parameters.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Journal of Thermal Spray Technology, Jahrgang 32, Nr. 7, 10.2023, S. 1909-1925.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Top–Down Approach for the Deposition of Photoactive (Na0.5Bi0.5)TiO3-Based Heterojunctions by Flame Spray
T2 - Analysis of Deposition Parameters
AU - Gutiérrez-Pérez, A. I.
AU - Ayala-Ayala, M. T.
AU - Mora-García, A. G.
AU - Hernández-Navarro, C.
AU - Pérez, S.
AU - Diaz-Real, J. A.
AU - González Hernández, J.
AU - Muñoz-Saldaña, J.
N1 - Funding Information: The authors are grateful to CONACYT for the financial support through project 319478. This work has been carried out at CENAPROT and LIDTRA national laboratories. Special thanks to Dr. G. Torres Delgado from CINVESTAV Querétaro for the support on the measurements in the UV–vis spectrophotometer, Dr. E. F. Reguera Ruiz of the National Laboratory of Conversion and Energy Storage (LNCAE) IPN-CICATA-Legaria for the support on the XPS measurements and CIDESI for the X-ray diffraction measurements. J.A.D.-R. thanks CONACyT (“Ciencia de Frontera 2019−1” Grant Number CF-2095605) for financial support for PEC measurements equipment. C. H.-N. thanks CONACYT for the Postdoctoral Research Fellowship for the completion of this work.
PY - 2023/10
Y1 - 2023/10
N2 - Visible-light photoactive (Na0.5Bi0.5)TiO3 (NBT)-based heterojunctions have demonstrated their applicability in environmental remediation. The photocatalytic properties of NBT-based coatings are here reported. NBT-based materials were deposited by oxyacetylene flame spray (FS). The physicochemical properties were analyzed as a function of the spraying parameters: fuel/oxygen ratio (F/O), stand-off distance (SOD), and total gas flow (TF). A flame with reducing characteristics promotes the formation of TiO2 (anatase and rutile) and Bi4Ti3O12, while an oxidizing flame results in coatings rich in NBT and Bi4Ti3O12. The SOD mainly influences the degree of crystallinity, which is higher at shorter distances. Optical properties estimated by UV–VIS diffuse reflectance confirmed an increase in light absorption after the FS process, with an E g red shift from 3.32 eV of the NBT powder to 2.63-2.96 eV of the coatings. These values are dependent on the F/O, with a significant E g narrowing under reducing conditions. Photoelectrochemical measurements revealed that faster electron collection is obtained due to the transformations occurring throughout the FS process while still retaining nearly 70 and 88% of the photocurrent density (j ph) at UV and visible light, respectively. These results suggest the great potential of the FS methodology to produce multiphase photocatalytic coatings by tuning the processing parameters.
AB - Visible-light photoactive (Na0.5Bi0.5)TiO3 (NBT)-based heterojunctions have demonstrated their applicability in environmental remediation. The photocatalytic properties of NBT-based coatings are here reported. NBT-based materials were deposited by oxyacetylene flame spray (FS). The physicochemical properties were analyzed as a function of the spraying parameters: fuel/oxygen ratio (F/O), stand-off distance (SOD), and total gas flow (TF). A flame with reducing characteristics promotes the formation of TiO2 (anatase and rutile) and Bi4Ti3O12, while an oxidizing flame results in coatings rich in NBT and Bi4Ti3O12. The SOD mainly influences the degree of crystallinity, which is higher at shorter distances. Optical properties estimated by UV–VIS diffuse reflectance confirmed an increase in light absorption after the FS process, with an E g red shift from 3.32 eV of the NBT powder to 2.63-2.96 eV of the coatings. These values are dependent on the F/O, with a significant E g narrowing under reducing conditions. Photoelectrochemical measurements revealed that faster electron collection is obtained due to the transformations occurring throughout the FS process while still retaining nearly 70 and 88% of the photocurrent density (j ph) at UV and visible light, respectively. These results suggest the great potential of the FS methodology to produce multiphase photocatalytic coatings by tuning the processing parameters.
KW - bismuth-based heterojunctions
KW - ceramics
KW - flame spray
KW - sodium bismuth titanate
KW - thick coatings
KW - visible-light photoactive
UR - http://www.scopus.com/inward/record.url?scp=85164112909&partnerID=8YFLogxK
U2 - 10.1007/s11666-023-01626-x
DO - 10.1007/s11666-023-01626-x
M3 - Article
AN - SCOPUS:85164112909
VL - 32
SP - 1909
EP - 1925
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
SN - 1059-9630
IS - 7
ER -