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    STUDIA CHEMIA - Issue no. 4 / 2007  
         
  Article:   REMOVAL OF NITRODERIVATES FROM SYNTHETIC WASTEWATERS BY ELECTROCHEMICAL REDUCTION.

Authors:  MIHAELA-CLAUDIA TERTIŞ, MARIA JITARU. 		 
       
         
  Abstract:   The electrochemical reduction of 4-nitrophenol (4-NP) and 2,6-dinitrophenol (2,6-DNP) in different conditions (0.2N H2SO4 and 0.1 M NaCl aqueous solution) were studied in this work. In the case of 4-NP the cathodic materials were nickel and graphite, and the electrochemical reduction processes were performed in two different reactors (two compartment reactor type filter-press, and undivided electrochemical reactor, both with electrolyte recirculation). In the case of 2,6-DNP the cathode was made from graphite using two compartment reactor with electrolyte recirculation. The experimental processes were pursued by different methods: cyclic voltammetry (BAS100), and spectrophotometry in UV-Visible (Unicam Helyos B and DR/2000 HACH); λmax = 318 nm for 4-nitrophenol and λmax = 440 nm for 2,6-DNP. The experimental determinations demonstrated practically 65-99% removal yield for the both nitro derivatives, depending on the experimental conditions. The best result have been obtained, in the case of 4-NP, in undivided electrochemical reactor with graphite electrode (90% of 4-NP removal), and in the case of 2,6-DNP the final removal was of 99% in two compartment reactor with graphite cathode.  
         
     
         
         
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