Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 379, Issue 1-3, Pages 163-168Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.11.035
Keywords
Electrochemical degradation; Chlorophenol; Wastewater; Freundlich isotherm
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A reactor using granular graphite as an electrode material was used to electrochemically degrade 2,4-dichlorophenol. The degradation efficiency reached more than 95% after 24 h at all experimental conditions. Adsorption of 2,4-dichlorophenol by the granular graphite can be described with the Freundlich isotherm. The degradation kinetics are pseudo-first-order. The degradation rate increased linearly with both applied current density and flow rate. The pseudo-first-order surface reaction rate constants, ka, at a flow rate of 5 mL/min increased from 0.0015 L/h m(2) at an applied current density of 0.41 mA/m(2) to 0.0028 L/h m(2) at an applied current density of 2.21 mA/m(2). The ka values at a current density of 1.14 mA/m(2) increased from 0.0021 L/h m(2) at a flow rate of 5 mL/min to 0.0068 L/h m(2) at a flow rate of 50 mL/min. Charge efficiency, ranging from less than 1 to 60 mu g/C, increased with the concentration of 2,4-dichlorophenol and decreased with the applied current density. Hence, using a low applied current density could be more economical than a high applied current density when applying this technique. (C) 2010 Elsevier B.V. All rights reserved.
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