Chlorination of iodide-containing waters in the presence of CuO: Formation of periodate

Chao Liu; Elisabeth Salhi; Jean-Philippe Croue; Urs von Gunten

doi:10.1021/es5032079

Chlorination of iodide-containing waters in the presence of CuO: Formation of periodate

Chao Liu, Elisabeth Salhi, Jean-Philippe Croue, Urs von Gunten

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29 Scopus citations

Abstract

It 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.

Original language	English (US)
Pages (from-to)	13173-13180
Number of pages	8
Journal	Environmental Science & Technology
Volume	48
Issue number	22
DOIs	https://doi.org/10.1021/es5032079
State	Published - Oct 31 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Part 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.

ASJC Scopus subject areas

Environmental Chemistry
General Chemistry

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10.1021/es5032079

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@article{c2b48f0004a94a2d877912400f38fa42,

title = "Chlorination of iodide-containing waters in the presence of CuO: Formation of periodate",

abstract = "It 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.",

author = "Chao Liu and Elisabeth Salhi and Jean-Philippe Croue and {von Gunten}, Urs",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: Part 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.",

year = "2014",

month = oct,

day = "31",

doi = "10.1021/es5032079",

language = "English (US)",

volume = "48",

pages = "13173--13180",

journal = "Environmental Science & Technology",

issn = "0013-936X",

publisher = "American Chemical Society",

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T1 - Chlorination of iodide-containing waters in the presence of CuO: Formation of periodate

AU - Liu, Chao

AU - Salhi, Elisabeth

AU - Croue, Jean-Philippe

AU - von Gunten, Urs

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: Part 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.

PY - 2014/10/31

Y1 - 2014/10/31

N2 - It 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.

AB - It 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.

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U2 - 10.1021/es5032079

DO - 10.1021/es5032079

M3 - Article

C2 - 25313794

SN - 0013-936X

VL - 48

SP - 13173

EP - 13180

JO - Environmental Science & Technology

JF - Environmental Science & Technology

IS - 22

ER -

Chlorination of iodide-containing waters in the presence of CuO: Formation of periodate

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