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    STUDIA CHEMIA - Issue no. 1 / 2005  
         
  Article:   ELECTROCHEMICAL BEHAVIOR OF PHENOLS IN AQUEOUS SOLUTION ľ FUNDAMENTS FOR THEIR ELECTROCHEMICAL DEGRADATION IN WASTE WATERS.

Authors:  MARIA JITARU, LUISA ROXANA MANDOC, CRISTINA MIHAI, OANA TUDORAN.
 
       
         
  Abstract:  The main objective of this work is to bring information (influence of the nature of the electrode material, of pH, nature of the organic molecules) on the electrochemical parameters (peak potentials, current density) concerning the electrochemical behavior of some phenols, in different aqueous solution, having pH between 4 and 12 on different electrode materials (glassy carbon, Au, Hg, PbO2). Both electrochemical processes on the level of hydroxyl and nitro group (in p-nitrophenol) have been studied.Different phenols (phenol, p-nitrophenol, p-metoxyphenol and 1-naphtol) derivatives have been of interest in this work, in order to establish their electrochemical behavior, useful for the electrochemical degradation.In this work, cyclic voltammetry (using BAS 100W and AUTOLAB PGSAT computer aided electrochemical systems) and UV-Vis spectrophotometry (UNICAM Helios β) were used for the control of phenols concentration during the electro-oxidation.As compared to the electrochemical oxidation of naphtols, the electrochemical oxidation of phenols, having a strong aromatic character, takes place more difficult. The oxidation processes on the level of phenolic group strongly depends on the pH. On the other hand, the nitrophenols could be reduced on the level of nitro group and their oxidation is also possible.  
         
     
         
         
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