Aqueous phenol and ethylene glycol solutions in electrohydrodynamic liquid bridging

Walter de Gruyter GmbH - 2011
Mathias Eisenhut, Xinghua Guo1, Astrid H. Paulitsch-Fuchs2, Elmar Fuchs2
12Graz University of Technology
21Wetsus — Centre of Excellence for Sustainable Water Technology

Tóm tắt

AbstractThe formation of aqueous bridges containing phenol and ethylene glycol as well as bisphenol-A, hydrochinone and p-cresol under the application of high voltage DC (“liquid bridges”) is reported. Detailed studies were made for phenol and glycol with concentrations from 0.005 to 0.531 mol L−1. Conductivity as well as substance and mass transfers through these aqueous bridges are discussed and compared with pure water bridges. Previously suggested bidirectional mass transport is confirmed for the substances tested. Anodic oxidation happens more efficiently when phenol or glycol are transported from the cathode to the anode since in this case the formation of a passivation layer or electrode poisoning are retarded by the electrohydrodynamic (EHD) flow. The conductivity in the cathode beaker decreases in all experiments due to electrophoretic transport of naturally dissolved carbonate and bicarbonate to the anode. The observed electrochemical behavior is shortly discussed and compared to known mechanisms.

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