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Article

Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC

1
Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Barrio Sarriena s/n, 48940 Leioa, Spain
2
Department of Chemical and Environmental Engineering, Faculty of Engineering Vitoria-Gasteiz, University of the Basque Country UPV/EHU, Nieves Cano 12, 01006 Vitoria-Gasteiz, Spain
3
Department of Chemical and Biomolecular Engineering, University of Cantabria, 39005 Santander, Spain
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3448; https://doi.org/10.3390/w12123448
Received: 30 October 2020 / Revised: 27 November 2020 / Accepted: 3 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Advanced Oxidation Processes for Water and Wastewater Treatment)
This work aims to study the sustainable catalytic ozonation of aniline promoted by granular active carbon (GAC) doped with TiO2. Aniline was selected as a model compound for the accelerator manufacturing industries used in the manufacture of rubber due to its environmental impact, low biodegradability, and harmful genotoxic effects on human health. Based on the evolution of total organic carbon (TOC), aniline concentration measured using high performance liquid chromatography (HPLC), pH and ozone concentration in liquid and gas phase, and catalyst loading, a three-phase reaction system has been modelled. The proposed three-phase model related the ozone transfer parameters and the pseudo-first order kinetic constants through three coefficients that involve the adsorption process, oxidation in the liquid, and the solid catalyst. The interpretation of the kinetic constants of the process allowed the predominance of the mechanism of Langmuir–Hinshelwood or modified Eley–Rideal to be elucidated. Seven intermediate aromatic reaction products, representative of the direct action of ozone and the radical pathway, were identified and quantified, as well as precursors of the appearance of turbidity, with which two possible routes of degradation of aniline being proposed. View Full-Text
Keywords: aniline; catalytic ozonation; degradation routes; industrial wastewater; three-phase system; TiO2/GAC aniline; catalytic ozonation; degradation routes; industrial wastewater; three-phase system; TiO2/GAC
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MDPI and ACS Style

Ferreiro, C.; Villota, N.; Lombraña, J.I.; Rivero, M.J. Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC. Water 2020, 12, 3448. https://doi.org/10.3390/w12123448

AMA Style

Ferreiro C, Villota N, Lombraña JI, Rivero MJ. Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC. Water. 2020; 12(12):3448. https://doi.org/10.3390/w12123448

Chicago/Turabian Style

Ferreiro, Cristian, Natalia Villota, José I. Lombraña, and María J. Rivero 2020. "Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC" Water 12, no. 12: 3448. https://doi.org/10.3390/w12123448

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