Dehalogenation of iodinated x-ray contrast media in a bioelectrochemical system

Mu, Yang, Radjenovic, Jelena, Shen, Jinyou, Rozendal, Rene A., Rabaey, Korneel and Keller, Jurg (2011) Dehalogenation of iodinated x-ray contrast media in a bioelectrochemical system. Environmental Science & Technology, 45 2: 782-788. doi:10.1021/es1022812

Author Mu, Yang
Radjenovic, Jelena
Shen, Jinyou
Rozendal, Rene A.
Rabaey, Korneel
Keller, Jurg
Title Dehalogenation of iodinated x-ray contrast media in a bioelectrochemical system
Journal name Environmental Science & Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2011
Year available 2010
Sub-type Article (original research)
DOI 10.1021/es1022812
Volume 45
Issue 2
Start page 782
End page 788
Total pages 7
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2011
Language eng
Abstract Iodinated X-ray contrast media (ICM) are only to a limited extent removed from conventional wastewater treatment plants, due to their high recalcitrance. This work reports on the cathodic dehalogenation of the ICM iopromide in a bioelectrochemical system (BES), fed with acetate at the anode and iopromide at the cathode. When the granular graphite cathode potential was decreased from -500 to -850 mV vs standard hydrogen electrode (SHE), the iopromide removal and the iodide release rates increased from 0 to 4.62 ± 0.01 mmol m(-3) TCC d(-1) and 0 to 13.4 ± 0.16 mmol m(-3) TCC d(-1) (Total Cathodic Compartment, TCC) respectively. Correspondingly, the power consumption increased from 0.4 ± 1 to 20.5 ± 3.3 W m(-3) TCC. The Coulombic efficiency of the iopromide dehalogenation at the cathode was less than 1%, while the Coulombic efficiency of the acetate oxidation at the anode was lower than 50% at various granular graphite cathode potentials. The results suggest that iopromide could be completely dehalogenated in BESs when the granular graphite cathode potential was controlled at -800 mV vs SHE or lower. This finding was further confirmed using mass spectrometry to identify the dehalogenated intermediates and products of iopromide in BESs. Kinetic analysis indicates that iopromide dehalogenation in batch experiments can be described by a first-order model at various cathode potentials. This work demonstrates that the BESs have a potential for efficient dehalogenation of ICM from wastewater or environmental streams.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes 8 December, 2010. [Epub publication] no month noted in print version.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Advanced Water Management Centre Publications
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Created: Tue, 11 Jan 2011, 08:41:30 EST by Hong Lee on behalf of Advanced Water Management Centre