Photocatalytic degradation of Diuron in water – Impact of Rh impregnation on P25 visible light activity
Quimbayo, Jennyffer Stefania Martinez; Ghosalya, Manoj Kumar; Devi, Assa Aravindh Sasikala; Ahola, Juha; Sliz, Rafal; Huttula, Marko; Alatalo, Matti; Urpelainen, Samuli; Ojala, Satu (2024-10-19)
Elsevier
19.10.2024
Quimbayo, J. S. M., Ghosalya, M. K., Devi, A. A. S., Ahola, J., Sliz, R., Huttula, M., Alatalo, M., Urpelainen, S., & Ojala, S. (2024). Photocatalytic degradation of Diuron in water – Impact of Rh impregnation on P25 visible light activity. Journal of Water Process Engineering, 68, 106323. https://doi.org/10.1016/j.jwpe.2024.106323.
https://creativecommons.org/licenses/by/4.0/
© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202410286470
https://urn.fi/URN:NBN:fi:oulu-202410286470
Tiivistelmä
Abstract
Significant efforts have lately been dedicated to the development of visible light activated photocatalysts for the degradation of emerging pollutants in water. This study shows the impact of Rh addition on the photocatalytic performance of TiO2 in Diuron degradation through various experimental approaches and modelling. Three samples with different Rh loading (0.5 %, 1 %, and 2 %) were synthesized, characterized, and their activities were evaluated. It was observed that the activity of RhP25 improved under white light irradiation with increasing Rh content. At low Rh loadings the Rh atoms interact with Ti and may be stabilized in the TiO2 lattice. At higher loadings Rh interacts with the O atoms forming two different clusters Rh3O4 and Rh4O6 on the TiO2 surface. This phenomenon was evidenced by DFT, XPS and XRD results. The addition of Rh induce new electronic states in the TiO2 enhancing the visible light absorption. Photocatalytic experiments revealed a threefold increase in Diuron removal under white light irradiation for 2%RhP25 compared to P25, achieving 23 % degradation in comparison with the 7 % observed for the P25 without the Rh addition. Furthermore, repeated experiments did not show significant deterioration of the activity.
Significant efforts have lately been dedicated to the development of visible light activated photocatalysts for the degradation of emerging pollutants in water. This study shows the impact of Rh addition on the photocatalytic performance of TiO2 in Diuron degradation through various experimental approaches and modelling. Three samples with different Rh loading (0.5 %, 1 %, and 2 %) were synthesized, characterized, and their activities were evaluated. It was observed that the activity of RhP25 improved under white light irradiation with increasing Rh content. At low Rh loadings the Rh atoms interact with Ti and may be stabilized in the TiO2 lattice. At higher loadings Rh interacts with the O atoms forming two different clusters Rh3O4 and Rh4O6 on the TiO2 surface. This phenomenon was evidenced by DFT, XPS and XRD results. The addition of Rh induce new electronic states in the TiO2 enhancing the visible light absorption. Photocatalytic experiments revealed a threefold increase in Diuron removal under white light irradiation for 2%RhP25 compared to P25, achieving 23 % degradation in comparison with the 7 % observed for the P25 without the Rh addition. Furthermore, repeated experiments did not show significant deterioration of the activity.
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