Mañana, JUEVES, 24 DE ABRIL, el sistema se apagará debido a tareas habituales de mantenimiento a partir de las 9 de la mañana. Lamentamos las molestias.
An approach on the comparative behavior of chloro / nitro substituted phenols photocatalytic degradation in water
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
Elsevier B.VDate
2019-06-01Citation
10.1016/j.jece.2019.103051
Journal of Environmental Chemical Engineering 7.3 (2019): 103051
ISSN
2213-3437DOI
10.1016/j.jece.2019.103051Funded by
This work has been supported by the Spanish Plan Nacional de I+D+i through the project CTM2015-64895-R. Alvaro Tolosana-Moranchel thanks to Ministerio de Educación, Cultura y Deporte for his FPU grant (FPU14/01605). The authors are also grateful to Evonik Company for TiO2 sampleProject
Gobierno de España. CTM2015-64895-REditor's Version
https://doi.org/10.1016/j.jece.2019.103051Subjects
Chlorophenols; Hammett constant; Nitrophenols; Photocatalytic degradation; TiO 2; QuímicaNote
This Accepted Manuscript will be available for reuse under a CC BY-NC-ND licence after 24 months of embargo periodRights
© 2019 Elsevier Ltd. All rights reserved.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
The study of position and number of substituents on the photocatalytic removal of some mono-, di- and tri-, chloro- and nitrophenols, as well as more known initial TOC concentration effect, has revealed the noteworthy impact on the process efficiency. Despite the complex effect of multiple substituents directing the HO attack to their preferential positions, Hammett constant could be used to predict photocatalytic degradation performance. TiO2 P25 was able to mineralize initial TOC concentrations up to 25-50 mg·L-1. Higher TOC concentrations constitute a drawback and drive to residual parent pollutants and organic by-products, which become more important when raising the starting TOC loading. Increasing the number of chloro- or nitro- groups in the aromatic ring does not imply higher ecotoxiticy values; contrarily, the position of the substituent can lead to significant differences. TOC conversion values are hardly affected by the substituent position, but by the number of groups in the organic molecule, probably due to steric hindrance. The formation of chloride and nitrogen inorganic ions, inherent to photocatalytic degradation, fulfills the Cl and N mass balances. Finally, the effect of number, position and electronic nature of substituents on contaminant initial photocatalytic degradation rates was studied by corresponding Hammett constant correlations
Files in this item
Google Scholar:Tolosana-Moranchel, A.
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Ovejero, D.
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Barco, B.
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Bahamonde, A.
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Díaz Nieto, Elena
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Faraldos, M.
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