Electrochemical determination of the active zones in a high-frequency ultrasonic reactor
1996; Elsevier BV; Volume: 3; Issue: 2 Linguagem: Inglês
10.1016/1350-1477(96)00006-y
ISSN1873-2828
AutoresFethi Trabelsi, H. Aït-Lyazidi, J. Berlan, Paul‐Louis Fabre, H. Delmas, A.M. Wilhelm,
Tópico(s)Innovative Microfluidic and Catalytic Techniques Innovation
ResumoIn order to design a new reactor based on sonoelectrochemical technology for processes of wastewater treatment, mass transfer is studied in a high-frequency (560 kHz) ultrasonic reactor. The determination of the active zones is of particular interest because it allows to locate the electrodes where mass transfer is highest. The determination of the mass-transfer coefficient was achieved by measuring the diffusion current obtained in the electrochemical reduction of potassium ferricyanide. Mean mass-transfer coefficients kd are calculated at different points throughout the reactor and a spatial distribution of kd is obtained which represents the active zones of the reactor. This spatial distribution is in good agreement with the one obtained recently by chemiluminescence measurements and confirms the difference existing between the spatial distribution obtained by sonication at low frequency (20 kHz) and high frequency (500 kHz) ultrasound.
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