The present work investigates the effect of the counter ion nature on the noise of the over-limiting current (Iov). Moreover, the electrochemical methods, current voltage curve (I–V) and the chronopotentiometry (V–t) measurements are applied. The over-limiting current is always accompanied by a neat electrical noise. It is a well accepted experimental phenomenon. The study of this noise may contribute to a better understanding of the Iov and the feasibility of electrodialysis operation at this current in terms of energy consumption. The electrical noise depends directly on the counter ion nature. The power spectral density of the membrane's potential fluctuation was obtained via Fourier analysis of the time series recorded during the transport of counter ions (K+ and NH4+). The spectra are evaluated above the limiting current indicating the differences between the K+ and the NH4+. It is found that the cation NH4+ presents a singular behaviour and the noise is minimal.
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Research Article|
March 12 2013
Noise spectra of K+ and NH4+ ions at over-limiting current in an electrochemical system with a cation exchange membrane
K. Oulmi
;
1
Laboratory of Chemistry and Environmental Chemistry, LCCE, Department of Chemistry, Faculty of Science, University of Batna, 05000, Algeria2
Department of Processes Engineering, Faculty of Engineering Sciences, University of Setif, 1900, Algeria
E-mail: k_oulmi@yahoo.com
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K. E. Bouhidel
;
K. E. Bouhidel
1
Laboratory of Chemistry and Environmental Chemistry, LCCE, Department of Chemistry, Faculty of Science, University of Batna, 05000, Algeria
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G. M. Andreadis
G. M. Andreadis
3
Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 383 34 Volos, Greece
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Journal of Water Reuse and Desalination (2013) 3 (3): 291-296.
Article history
Received:
November 21 2012
Accepted:
January 28 2013
Citation
K. Oulmi, K. E. Bouhidel, G. M. Andreadis; Noise spectra of K+ and NH4+ ions at over-limiting current in an electrochemical system with a cation exchange membrane. Journal of Water Reuse and Desalination 1 September 2013; 3 (3): 291–296. doi: https://doi.org/10.2166/wrd.2013.001
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K. Oulmi, K. E. Bouhidel, G. M. Andreadis; Noise spectra of K+ and NH4+ ions at over-limiting current in an electrochemical system with a cation exchange membrane. Journal of Water Reuse and Desalination 1 September 2013; 3 (3): 291–296. doi: https://doi.org/10.2166/wrd.2013.001
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