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Electrochemical hydrodehalogenation of chlorinated phenols in aqueous solutions: II. Effect of operating parameters

Lookup NU author(s): Dr Hua Cheng, Emeritus Professor Keith Scott, Professor Paul Christensen

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Abstract

The effect of operating parameters on chloride ion release, current efficiencies, and energy consumptions of the electrochemical hydrodehalogenation (HDH) of dilute aqueous solutions of pentachlorophenol (PCP) and 2, 4-dichlorophenol (DCP) is reported. The parameters include the concentrations of PCP and DCP, applied current density, controlled cathode potential, temperature, and flow rate. Relatively high concentrations, high-temperature, and moderate current density (e.g., 10 mA cm-2) have the most beneficial effect on the HDH process. For example, the HDH of 20 mM DCP in an H-cell at 70°C gave current efficiencies up to 70% and an energy consumption of 2.6 kWh/kg DCP. Good results were also achieved in a solid polymer electrolyte zero gap flow cell, e.g., a current efficiency of 35% and an energy consumption of 4.5 kWh/kg. Encouragingly, the energy consumed for the HDH of 50 ppm PCP in water at ambient temperature is in a range of 28 and 80 kWh/kg PCP, which is much lower than previously reported. © 2002 The Electrochemical Society. All rights reserved.


Publication metadata

Author(s): Cheng H, Scott K, Christensen PA

Publication type: Article

Publication status: Published

Journal: Journal of the Electrochemical Society

Year: 2003

Volume: 150

Issue: 2

Pages: D25-D29

Print publication date: 01/02/2003

ISSN (print): 0013-4651

ISSN (electronic): 1945-7111

Publisher: Electrochemical Society, Inc.

URL: http://dx.doi.org/10.1149/1.1531972

DOI: 10.1149/1.1531972


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