A Pd/C gas-diffusion cathode which generated H2O2 through a two-electron reduction process of fed oxygen molecule was used to degrade 4-chlorophenol in an undivided electrolysis device. The kinetics of 4-chlorophenol degradation has been investigated by the electrochemical oxidation processes. By inspecting the relationship between the rate constants (k) and inﬂuencing factors, using ﬁrst-order kinetics to describe the electrochemical oxidation process of 4-chlorophenol, a kinetic model of 4-chlorophenol degradation process was proposed to calculate the 4-chlorophenol efﬂuent concentration: C = C0 exp( -3:76 × 10-6C-0.50J2M-0.7Q0.17Dt). It was found that the electrocatalytic degradation rate of 4-chlorophenol was affected by current density, electrode distance, air-feeding rate, electrolyte concentration and initial 4-chlorophenol concentration. The kinetics obtained from the experiments under corresponding electrochemical conditions could provide an accurate estimation of 4-chlorophenol efﬂuent concentration and lead to better design of the electrochemical reactor.
Electrocatalytic degradation kinetic of 4-chlorophenol by the Pd/C gas-diffusion electrode system
Z. Y. Bian, Y. Bian, H. Wang, L. Pang, A. Z. Ding; Electrocatalytic degradation kinetic of 4-chlorophenol by the Pd/C gas-diffusion electrode system. Water Sci Technol 1 April 2013; 67 (8): 1873–1879. doi: https://doi.org/10.2166/wst.2013.069
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