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dc.contributor.authorLiu, Chao
dc.contributor.authorSalhi, Elisabeth
dc.contributor.authorCroue, Jean-Philippe
dc.contributor.authorvon Gunten, Urs
dc.date.accessioned2015-08-03T12:17:21Z
dc.date.available2015-08-03T12:17:21Z
dc.date.issued2014-11-18
dc.identifier.issn0013936X
dc.identifier.pmid25313794
dc.identifier.doi10.1021/es5032079
dc.identifier.urihttp://hdl.handle.net/10754/563861
dc.description.abstractIt has been shown previously that the disproportionation of halogen-containing oxidants (e.g., HOCl, HOBr, and ClO2) is enhanced by a CuO-catalyzed process. In this study, the transformation of iodine during chlorination in the presence of CuO was investigated. There is no significant enhancement of the disproportionation of hypoiodous acid (HOI) in the presence of CuO. The formation rate of iodate (IO3 -) in the CuO-HOCl-I- system significantly increased when compared to homogeneous solutions, which was ascribed to the activation of HOCl by CuO enhancing its reactivity toward HOI. In this reaction system, iodate formation rates increase with increasing CuO (0-0.5 g L-1) and bromide (0-2 μM) doses and with decreasing pH (9.6-6.6). Iodate does not adsorb to the CuO surfaces used in this study. Nevertheless, iodate concentrations decreased after a maximum was reached in the CuO-HOCl-I-(-Br-) systems. Similarly, the iodate concentrations decrease as a function of time in the CuO-HOCl-IO3 - or CuO-HOBr-IO3 - system, and the rates increase with decreasing pH (9.6-6.6) due to the enhanced reactivity of HOCl or HOBr in the presence of CuO. It could be demonstrated that iodate is oxidized to periodate by a CuO-activated hypohalous acid, which is adsorbed on the CuO surface. No periodate could be measured in filtered solutions because it was mainly adsorbed to CuO. The adsorbed periodate was identified by scanning electron microscopy plus energy dispersive spectroscopy and X-ray photoelectron spectroscopy.
dc.description.sponsorshipPart of this study was performed during an academic visit of C. Liu at Eawag. We acknowledge the funding and support from KAUST and Eawag. We also thank Cyril Aubry and Mohamed Nejib Hedhili for their help with SEM-EDS and XPS analyses.
dc.publisherAmerican Chemical Society (ACS)
dc.titleChlorination of iodide-containing waters in the presence of CuO: Formation of periodate
dc.typeArticle
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.identifier.journalEnvironmental Science & Technology
dc.contributor.institutionEawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133Dübendorf, Switzerland
dc.contributor.institutionCurtin Water Quality Research Centre, Department of Chemistry, Curtin UniversityPerth, Australia
dc.contributor.institutionSchool of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Fédérale de Lausanne (EPFL)Lausanne, Switzerland
kaust.personLiu, Chao
kaust.personCroue, Jean-Philippe


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