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Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity

Bare zinc oxide (ZnO) and Ba-doped ZnO (BZO) samples were prepared by using a simple precipitation method. The effects of Barium doping on the structural, morphological, and optoelectronic properties, as well as on the physico-chemical features of the surface were investigated and correlated with th...

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Autores principales: Hamrouni, Abdessalem, Moussa, Marwa, Fessi, Nidhal, Palmisano, Leonardo, Ceccato, Riccardo, Rayes, Ali, Parrino, Francesco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10609520/
https://www.ncbi.nlm.nih.gov/pubmed/37887893
http://dx.doi.org/10.3390/nano13202742
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author Hamrouni, Abdessalem
Moussa, Marwa
Fessi, Nidhal
Palmisano, Leonardo
Ceccato, Riccardo
Rayes, Ali
Parrino, Francesco
author_facet Hamrouni, Abdessalem
Moussa, Marwa
Fessi, Nidhal
Palmisano, Leonardo
Ceccato, Riccardo
Rayes, Ali
Parrino, Francesco
author_sort Hamrouni, Abdessalem
collection PubMed
description Bare zinc oxide (ZnO) and Ba-doped ZnO (BZO) samples were prepared by using a simple precipitation method. The effects of Barium doping on the structural, morphological, and optoelectronic properties, as well as on the physico-chemical features of the surface were investigated and correlated with the observed photocatalytic activity under natural solar irradiation. The incorporation of Ba(2+) ions into the ZnO structure increased the surface area by ca. 14 times and enhanced the hydrophilicity with respect to the bare sample, as demonstrated by infrared spectroscopy and contact angle measurements. The surface hydrophilicity was correlated with the enhanced defectivity of the doped sample, as indicated by X-ray diffraction, Raman, and fluorescence spectroscopies. The resulting higher affinity with water was, for the first time, invoked as an important factor justifying the superior photocatalytic performance of BZO compared to the undoped one, in addition to the slightly higher separation of the photoproduced pairs, an effect that has already been reported in literature. In particular, observed kinetic constants values of 8∙10(−3) and 11.3∙10(−3) min(−1) were determined for the ZnO and BZO samples, respectively, by assuming first order kinetics. Importantly, Ba doping suppressed photocorrosion and increased the stability of the BZO sample under irradiation, making it a promising photocatalyst for the abatement of toxic species.
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spelling pubmed-106095202023-10-28 Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity Hamrouni, Abdessalem Moussa, Marwa Fessi, Nidhal Palmisano, Leonardo Ceccato, Riccardo Rayes, Ali Parrino, Francesco Nanomaterials (Basel) Article Bare zinc oxide (ZnO) and Ba-doped ZnO (BZO) samples were prepared by using a simple precipitation method. The effects of Barium doping on the structural, morphological, and optoelectronic properties, as well as on the physico-chemical features of the surface were investigated and correlated with the observed photocatalytic activity under natural solar irradiation. The incorporation of Ba(2+) ions into the ZnO structure increased the surface area by ca. 14 times and enhanced the hydrophilicity with respect to the bare sample, as demonstrated by infrared spectroscopy and contact angle measurements. The surface hydrophilicity was correlated with the enhanced defectivity of the doped sample, as indicated by X-ray diffraction, Raman, and fluorescence spectroscopies. The resulting higher affinity with water was, for the first time, invoked as an important factor justifying the superior photocatalytic performance of BZO compared to the undoped one, in addition to the slightly higher separation of the photoproduced pairs, an effect that has already been reported in literature. In particular, observed kinetic constants values of 8∙10(−3) and 11.3∙10(−3) min(−1) were determined for the ZnO and BZO samples, respectively, by assuming first order kinetics. Importantly, Ba doping suppressed photocorrosion and increased the stability of the BZO sample under irradiation, making it a promising photocatalyst for the abatement of toxic species. MDPI 2023-10-10 /pmc/articles/PMC10609520/ /pubmed/37887893 http://dx.doi.org/10.3390/nano13202742 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hamrouni, Abdessalem
Moussa, Marwa
Fessi, Nidhal
Palmisano, Leonardo
Ceccato, Riccardo
Rayes, Ali
Parrino, Francesco
Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title_full Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title_fullStr Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title_full_unstemmed Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title_short Solar Photocatalytic Activity of Ba-Doped ZnO Nanoparticles: The Role of Surface Hydrophilicity
title_sort solar photocatalytic activity of ba-doped zno nanoparticles: the role of surface hydrophilicity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10609520/
https://www.ncbi.nlm.nih.gov/pubmed/37887893
http://dx.doi.org/10.3390/nano13202742
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