Removal of emergent contaminants: integration of ozone and photocatalysis

Journal of Environmental Management
F Javier RivasAngel Encinas

Abstract

A mixture of nine pharmaceuticals has been treated by means of the systems: UV-B(313 nm), O(3), UV-B(313 nm) + TiO(2), O(3) + UV-B(313 nm), and O(3) + UV-B(313 nm)+TiO(2). Simple photolytic or ozonation processes lead to a deficient total organic carbon (TOC) elimination after 120 min of exposure (25 and 30% conversions, respectively). Addition of a photocatalyst such as titanium dioxide significantly enhanced the mineralization degree, a 60% TOC conversion was obtained. A TiO(2) load optimum around 0.25 g L(-1) was observed. No loss in photoactivity was experienced after 2 reuses. Due to ozone photodegradation, the combination of ozone and radiation increased the generation of hydroxyl radicals. As a consequence, TOC removal was increased to a value in the proximity of 85%. The most complex system, O(3) + UV-B(313 nm) + TiO(2), achieved the highest TOC abatement (95%). Use of ozone in photocatalytic processes involves an increase in hydroxyl radical generation.

References

Nov 8, 2003·Water Research·F Javier RivasFátima Carvalho
Dec 11, 2003·Chemical Reviews·Yutaka Matsumi, Masahiro Kawasaki
Sep 5, 2007·Journal of Environmental Management·Isil Gültekin, Nilsun H Ince
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Citations

Apr 1, 2014·Journal of Environmental Management·Maria Quero-PastorAsuncion Acevedo
Jul 30, 2014·Journal of Hazardous Materials·Irene CarraJosé Antonio Sánchez Pérez
Jul 23, 2013·The Science of the Total Environment·Dragana D Četojević-SiminBiljana F Abramović
Jan 2, 2015·Bioresource Technology·Eleni VaiopoulouSpyros G Pavlostathis
Jan 18, 2014·Water Research·Marcelo L WildeAyrton F Martins
Dec 19, 2013·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Azahara EspejoFernando J Beltrán
Nov 1, 2016·Environmental Science and Pollution Research International·Ana Lourdes OropesaFernando Beltrán
May 20, 2017·World Journal of Microbiology & Biotechnology·Ashwinkumar P RudrashettiR A Pandey
Aug 16, 2017·Environmental Science and Pollution Research International·Marko KeteUrška Lavrenčič Štangar
Nov 15, 2016·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Luca RimoldiSilvia Ardizzone
Mar 13, 2021·Environmental Research·Andraž ŠuligojUrška Lavrenčič Štangar

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