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    STUDIA CHEMIA - Issue no. 2 / 2006  
         
  Article:   ADSORPTION AND ELECTROCHEMICAL DATA FOR P-NITROPHENOL REMOVAL FROM SYNTHETIC WASTEWATERS.

Authors:  MARIA JITARU, BOGDANA KOUMANOVA.
 
       
         
  Abstract:  There are three main results reported in this paper refer to: (i) the equilibrium adsorption experiments of recalcitrant toxic p-nitrophenol (p-NP) on natural zeolites from Balkan area; (ii)voltamperommetric data on the electrochemical behavior of p-nitrophenol, depending on the electrode nature and working conditions (pH, electrolyte composition, hydrodynamic parameters (iii) and electrochemical oxidation to remove the remaining p-nitrophenol on different electrodes after the adsorption. The zeolite from Mirsid, Romania (zeolite-2) seems to have the best adsorption properties for p-nitro phenol, comparing to classical sorbent, active carbon powder. The synthetic waste waters containing 0.01p-NP have been treated by adsorption on (zeolite-2) and the decrease of the p-NF concentration up to 0.01 mM has been obtained. The remaining p-NP was treated by electrochemical way (electro-oxidation). Applying the combined adsorptive-electrochemical oxidation procedure we have been obtained the decrease of COT up to 98%, on SnO2/IrO2/Ti (Modified Oxides Electrode- MOE). These results could be explained by the catalytic effect of the zeolite for the chemical phenol oxidation.  
         
     
         
         
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