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On the role of Graphene Oxide/Titania catalyst, visible LED and ozone to remove mixtures of pharmaceutical contaminants from water and wastewater

Abstract

A mixture of eight contaminants of emerging concern (CECs), most of them of pharmaceutical origin: Acetaminophen, Antipyrine, Caffeine, Hydrochlorothiazide, Sulfamethoxazole, Ketorolac, Metoprolol, and Diclofenac have been treated with some advanced oxidation processes (AOP) involving ozone, visible LED radiation and a graphene oxide/titania catalyst (GO/TiO2). Variables that affect the process rate: visible LED radiation fluency, catalyst concentration and percentage of graphene oxide on the catalyst were optimized through a factorial design taking TOC as objective function. These variables were found to be: 303 W m-2, 0.4 g L-1, 1.5% GO loading, respectively, and tested in CEC doping wastewater. Application of gas-liquid absorption kinetics allows the kinetic regime of ozone reactions and the relative importance of mass transfer and chemical reactions be determined. Two reaction periods were observed: an initial one of less than 20 minutes where contaminants are removed mainly through direct reactions with ozone and a second one, where free radical oxidation predominates. In this second period, hydroxyl radical concentrations for ozonation and photocatalytic ozonation were found to be 1.1 and 3.2 x 10-13 M, respectively.

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Supplementary files

Article information


Submitted
26 Mar 2020
Accepted
14 May 2020
First published
15 May 2020

Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript
Article type
Paper

On the role of Graphene Oxide/Titania catalyst, visible LED and ozone to remove mixtures of pharmaceutical contaminants from water and wastewater

M. Checa Gómez, F. Beltran, J. rivas and E. M. Cordero Pérez, Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0EW00276C

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