Electrochemical incineration of oxalic acid at boron doped diamond anodes: Role of operative parameters

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Abstract

The electrochemical incineration of oxalic acid (OA) at boron doped diamond (BDD) anodes was investigated both theoretically and experimentally in order to find the influence of the operative parameters on the performances of the process. Polarization curves and chronoamperometric measurements indicate the probable occurrence of a direct electrochemical oxidation of OA at the surface of the BDD anode at low pH and of a hydroxyl radical-mediated reaction at high pH. When incineration electrolyses are performed at low pH with potentiostatic alimentation, a dramatic influence of the potential is observed. In amperostatic incineration, high CE are obtained when most part of the process was under charge transfer controlled kinetics, i.e., when low current densities and high flow rates are imposed. Under these conditions no significant effect of current densities or flow rates is observed. The results obtained at low pH are in good agreement with the previsions of a model based on the assumption that, under adopted experimental conditions, the performances of the process are mainly determined by the competition between the direct oxidation of oxalic acid and the water discharge. The effect of the pH and of the supporting electrolyte was further investigated
Lingua originaleEnglish
pagine (da-a)2095-2108
Numero di pagine14
RivistaElectrochimica Acta
Volume53
Stato di pubblicazionePublished - 2008

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Oxalic Acid
Incineration
Boron
Oxalic acid
Diamond
Diamonds
Anodes
Current density
Flow rate
Electrochemical oxidation
Electrolysis
Hydroxyl Radical
Electrolytes
Charge transfer
Polarization
Oxidation
Kinetics
Water

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry
  • Analytical Chemistry

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title = "Electrochemical incineration of oxalic acid at boron doped diamond anodes: Role of operative parameters",
abstract = "The electrochemical incineration of oxalic acid (OA) at boron doped diamond (BDD) anodes was investigated both theoretically and experimentally in order to find the influence of the operative parameters on the performances of the process. Polarization curves and chronoamperometric measurements indicate the probable occurrence of a direct electrochemical oxidation of OA at the surface of the BDD anode at low pH and of a hydroxyl radical-mediated reaction at high pH. When incineration electrolyses are performed at low pH with potentiostatic alimentation, a dramatic influence of the potential is observed. In amperostatic incineration, high CE are obtained when most part of the process was under charge transfer controlled kinetics, i.e., when low current densities and high flow rates are imposed. Under these conditions no significant effect of current densities or flow rates is observed. The results obtained at low pH are in good agreement with the previsions of a model based on the assumption that, under adopted experimental conditions, the performances of the process are mainly determined by the competition between the direct oxidation of oxalic acid and the water discharge. The effect of the pH and of the supporting electrolyte was further investigated",
author = "Giuseppe Filardo and Alessandro Galia and Chiara Guarisco and Onofrio Scialdone and Serena Randazzo",
year = "2008",
language = "English",
volume = "53",
pages = "2095--2108",
journal = "Electrochimica Acta",
issn = "0013-4686",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Electrochemical incineration of oxalic acid at boron doped diamond anodes: Role of operative parameters

AU - Filardo, Giuseppe

AU - Galia, Alessandro

AU - Guarisco, Chiara

AU - Scialdone, Onofrio

AU - Randazzo, Serena

PY - 2008

Y1 - 2008

N2 - The electrochemical incineration of oxalic acid (OA) at boron doped diamond (BDD) anodes was investigated both theoretically and experimentally in order to find the influence of the operative parameters on the performances of the process. Polarization curves and chronoamperometric measurements indicate the probable occurrence of a direct electrochemical oxidation of OA at the surface of the BDD anode at low pH and of a hydroxyl radical-mediated reaction at high pH. When incineration electrolyses are performed at low pH with potentiostatic alimentation, a dramatic influence of the potential is observed. In amperostatic incineration, high CE are obtained when most part of the process was under charge transfer controlled kinetics, i.e., when low current densities and high flow rates are imposed. Under these conditions no significant effect of current densities or flow rates is observed. The results obtained at low pH are in good agreement with the previsions of a model based on the assumption that, under adopted experimental conditions, the performances of the process are mainly determined by the competition between the direct oxidation of oxalic acid and the water discharge. The effect of the pH and of the supporting electrolyte was further investigated

AB - The electrochemical incineration of oxalic acid (OA) at boron doped diamond (BDD) anodes was investigated both theoretically and experimentally in order to find the influence of the operative parameters on the performances of the process. Polarization curves and chronoamperometric measurements indicate the probable occurrence of a direct electrochemical oxidation of OA at the surface of the BDD anode at low pH and of a hydroxyl radical-mediated reaction at high pH. When incineration electrolyses are performed at low pH with potentiostatic alimentation, a dramatic influence of the potential is observed. In amperostatic incineration, high CE are obtained when most part of the process was under charge transfer controlled kinetics, i.e., when low current densities and high flow rates are imposed. Under these conditions no significant effect of current densities or flow rates is observed. The results obtained at low pH are in good agreement with the previsions of a model based on the assumption that, under adopted experimental conditions, the performances of the process are mainly determined by the competition between the direct oxidation of oxalic acid and the water discharge. The effect of the pH and of the supporting electrolyte was further investigated

UR - http://hdl.handle.net/10447/9241

M3 - Article

VL - 53

SP - 2095

EP - 2108

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -