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Heterogeneous catalytic ozonation of aniline-contaminated waters: A three-phase modelling approach using TiO2/GAC

Abstract: 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 e_ects 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 coe_cients 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.

 Autoría: Ferreiro C., Villota N., Lombraña J.I., Rivero M.J.,

 Fuente: Water, 2020, 12(12), 3448

 Editorial: MDPI

 Fecha de publicación: 08/12/2020

 Nº de páginas: 26

 Tipo de publicación: Artículo de Revista

 DOI: 10.3390/w12123448

 ISSN: 2073-4441

Autoría

FERREIRO SANTISO, CRISTIAN

NATALIA VILLOTA SALAZAR

LOMBRAÑA ALONSO, JOSÉ IGNACIO