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Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

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dc.contributor Sch Pharm & Mol Sci
dc.contributor Aims
dc.contributor Biomol Anal Facil
dc.contributor James Cook Univ
dc.contributor James Cook University OELGEMOELLER, MICHAEL KANAKARAJU, DEVAGI MOTTI, CHERIE A. GLASS, BEVERLEY D. 2015-12-03T01:03:19Z 2015-12-03T01:03:19Z 2017-03-21T01:02:23Z 2019-05-09T01:05:05Z 2017-03-21T01:02:23Z 2017-03-21T01:02:23Z 2015-12-03T01:03:19Z 2019-05-09T01:05:05Z 2014-01-01
dc.identifier.citation Kanakaraju D, Motti CA, Glass BD, Oelgemoller M (2014) Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors. Environmental Chemistry 11(1): 51-62 en_US
dc.identifier.issn 1448-2517
dc.description.abstract The occurrence of diclofenac (DCF) as an emerging pollutant in surface waters and drinking water has been attributed to elevated global consumption and the inability of sewage treatment plants to remove DCF. In this study, DCF spiked drinking water and river water was subjected to photolysis and TiO2 photocatalytic treatments in a circulating laboratory-scale (immersion-well) and a demonstration-scale loop reactor (Laboclean). The operational parameters for the immersion-well reactor were optimised as follows: TiO2 P25 loading, 0.1 g L-1; natural pH, 6.2; initial concentration, 30 mg L-1; water type, distilled water. Complete DCF removal was realised within 15 min under the optimised conditions using the immersion-well reactor. Sunlight-mediated photochemical degradation required a prolonged exposure period of up to 360 min for complete DCF removal. DCF in distilled and drinking water was efficiently degraded in the larger Laboclean reactor. Differences were, however, observed based on their pseudo-first-order rate constants, which implies that the water matrix has an effect on the degradation rate. Six major photoproducts, 2-(8-chloro-9H-carbazol-1-yl) acetic acid, 2-(8-hydroxy-9H-carbazol-1-yl) acetic acid, 2,6-dichloro-N-o-tolylbenzenamine, 2-(phenylamino) benzaldehyde, 1-chloromethyl-9H-carbazole and 1-methyl-9H-carbazole, generated from TiO2 photocatalysis of DCF were identified by liquid chromatography-mass spectrometry (LCMS) and Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS). This work has shown that photocatalytic degradation kinetics of DCF are dependent on both the geometry of the photoreactor and the nature of the water matrices.
dc.description.sponsorship This work was supported by research grants from James Cook University (FAIG award 2009 and GRS awards 2011 and 2012). D. Kanakaraju also thanks the Malaysian Government for a University Doctorate Training Award. The authors thank Evonik industries for the donation of Titanium dioxide P25 Aeroxide and Mr Stephen Boyle (AIMS) for TOC analyses.
dc.description.uri en_US
dc.language English
dc.language.iso en en_US
dc.publisher CSIRO Publishing en_US
dc.relation.ispartof Null
dc.subject Tio2 Photocatalysis
dc.subject Heterogeneous Photocatalytic Degradation
dc.subject Waste-water
dc.subject Organic-compounds
dc.subject Pharmaceuticals
dc.subject Nonsteroidal Antiinflammatory Drugs
dc.subject Chemistry
dc.subject Treatment Plants
dc.subject Photodegradation Kinetics
dc.subject Environmental Sciences & Ecology
dc.subject Chemistry, Analytical
dc.subject Environmental Sciences
dc.subject Advanced Oxidation Processes
dc.subject Photocatalysis
dc.subject Uv-a/tio2 Photocatalysis
dc.subject Titanium Dioxide
dc.subject Pharmaceutical Residues
dc.title Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors
dc.type journal article en_US
dc.identifier.doi 10.1071/EN13098
dc.identifier.wos WOS:000336521700008

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