Oxidation of 4-chlorophenol at boron-doped diamond electrode for wastewater treatment

The electrochem. behavior of synthetic B-doped diamond thin-film electrode (BDD) was studied in acid media contg. 4-chlorophenol (4-CP) by cyclic voltammetry, chronoamperometry, and bulk electrolysis. The results showed that in the potential region of supporting electrolyte stability occur reactions involving the oxidn. of 4-CP to phenoxy radical and 1,4-benzoquinone. Polymeric materials, which result in electrode fouling, are also formed in this potential region. Electrolysis at high anodic potentials, in the region of electrolyte decompn., complex oxidn. reactions can take place involving electro-generated hydroxyl radicals, leading to the complete incineration of 4-chlorophenol. Electrode fouling is inhibited under these conditions. The exptl. results were compared with a theor. model. This model is based on the assumption that the rate of the anodic oxidn. of 4-CP is a fast reaction. HPLC analyses revealed that the main intermediate products of 4-CP oxidn. were 1,4-benzoquinone, maleic acid, formic acid, and oxalic acid. [on SciFinder (R)]

[1]  D. A. House Kinetics and Mechanism of Oxidations by Peroxydisulfate. , 1962 .

[2]  J. Butler,et al.  Underpotential Deposition of Cu on Boron-Doped Diamond Thin Films , 1998 .

[3]  G. Swain,et al.  Oxidation of Azide Anion at Boron-Doped Diamond Thin-Film Electrodes , 1998 .

[4]  Christos Comninellis,et al.  Oxidation of organics by intermediates of water discharge on IrO2 and synthetic diamond anodes , 1999 .

[5]  S. Palmas,et al.  Electrochemical Oxidation of Chlorophenols , 1997 .

[6]  E. Blank,et al.  Preparation and characterization of Ti/Diamond electrodes , 1998 .

[7]  Y. Pleskov Synthetic diamond in electrochemistry , 1999 .

[8]  C. Comninellis,et al.  Preparation of Peroxodisulfuric Acid Using Boron‐Doped Diamond Thin Film Electrodes , 1999 .

[9]  V. Schaller,et al.  Theoretical model for the anodic oxidation of organics on metal oxide electrodes , 1997 .

[10]  Michele Mascia,et al.  On the performance of Ti/SnO2 and Ti/PbO2 anodesin electrochemical degradation of 2-chlorophenolfor wastewater treatment , 1999 .

[11]  C. Pulgarin,et al.  Anodic oxidation of phenol for waste water treatment , 1991 .

[12]  E. Brillas,et al.  Degradation of 4‐Chlorophenol by Anodic Oxidation, Electro‐Fenton, Photoelectro‐Fenton, and Peroxi‐Coagulation Processes , 1998 .

[13]  R. Houk,et al.  Electrochemical Incineration of 4-Chlorophenol and the Identification of Products and Intermediates by Mass Spectrometry , 1999 .

[14]  P. Niedermann,et al.  Diamond-sensing microdevices for environmental control and analytical applications , 1998 .

[15]  N. Bunce,et al.  Electrochemical oxidation of chlorinated phenols , 1999 .

[16]  M. C. Granger,et al.  The influence of surface interactions on the reversibility of ferri/ferrocyanide at boron-doped diamond thin-film electrodes , 1999 .

[17]  C. Pulgarin,et al.  Electrochemical oxidation of phenol for wastewater treatment using SnO2, anodes , 1993 .

[18]  C. Comninellis Electrocatalysis in the electrochemical conversion/combustion of organic pollutants for waste water treatment , 1994 .

[19]  J. Angus,et al.  Applications of Diamond Thin Films in Electrochemistry , 1998 .

[20]  C. Bock,et al.  The Anodic Oxidation of p‐Benzoquinone and Maleic Acid , 1999 .

[21]  M. Panizza,et al.  Electrochemical generation of silver(II) at boron-doped diamond electrodes , 1999 .