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Electrocatalytic degradation kinetic of 4-chlorophenol by the Pd/C gas-diffusion electrode system.

Water science and technology : a journal of the International Association on Water Pollution Research (2013-04-13)

Z Y Bian, Y Bian, H Wang, L Pang, A Z Ding

PMID23579845

ABSTRACT

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(-6) C(-0.5)0 J(2) M(-0.7) Q(0.17) Dt). 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.

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Palladium, evaporation slug, diam. × L 0.6 cm × 0.6 cm, 99.95% trace metals basis