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Molecules 2017, 22(7), 1177; doi:10.3390/molecules22071177

Solar or UVA-Visible Photocatalytic Ozonation of Water Contaminants

Departamento de Ingeniería Química y Química Física, Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad, Universidad de Extremadura, Av. Elvas s/n, 06006 Badajoz, Spain
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Received: 27 April 2017 / Accepted: 4 July 2017 / Published: 14 July 2017
(This article belongs to the Special Issue Photon-involving Purification of Water and Air)
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Abstract

An incipient advanced oxidation process, solar photocatalytic ozonation (SPO), is reviewed in this paper with the aim of clarifying the importance of this process as a more sustainable water technology to remove priority or emerging contaminants from water. The synergism between ozonation and photocatalytic oxidation is well known to increase the oxidation rate of water contaminants, but this has mainly been studied in photocatalytic ozonation systems with lamps of different radiation wavelength, especially of ultraviolet nature (UVC, UVB, UVA). Nowadays, process sustainability is critical in environmental technologies including water treatment and reuse; the application of SPO systems falls into this category, and contributes to saving energy and water. In this review, we summarized works published on photocatalytic ozonation where the radiation source is the Sun or simulated solar light, specifically, lamps emitting radiation to cover the UVA and visible light spectra. The main aspects of the review include photoreactors used and radiation sources applied, synthesis and characterization of catalysts applied, influence of main process variables (ozone, catalyst, and pollutant concentrations, light intensity), type of water, biodegradability and ecotoxicity, mechanism and kinetics, and finally catalyst activity and stability. View Full-Text
Keywords: solar photocatalytic oxidation; ozonation; solar photocatalytic ozonation; water contaminants solar photocatalytic oxidation; ozonation; solar photocatalytic ozonation; water contaminants
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Beltrán, F.J.; Rey, A. Solar or UVA-Visible Photocatalytic Ozonation of Water Contaminants. Molecules 2017, 22, 1177.

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