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    STUDIA CHEMIA - Issue no. 4(I) / 2009  
         
  Article:   ELECTROCHEMICAL TREATMENT OF ACID WASTEWATERS CONTAINING METHYLORANGE.

Authors:  ADRIANA SAMIDE, MĂDĂLINA DUMITRU, ADINA CIUCIU, BOGDAN TUTUNARU, MIRCEA PREDA. 		 
       
         
  Abstract:  The degradation process of solutions containing Methylorange using electrochemical measurements, on Ti electrode was studied. In order to estimate the contribution of pure adsorption, behavior of Methylorange in open circuit was investigated. The color removal (CR) due to adsorption was estimated at 8.86%. From the anodic polarization, Ti electrode in the blank solution of 0.1 M HCl containing 0.035 M NaCl (ASB) or dye solution of 0.1 M HCl containing 0.035 M NaCl and Methylorange (ASC) a different behaviour was observed. In cathodic polarisation case, the ASC behavior being completely different towards ASB. It can be concluded that the polarisation curve for ASC in the potential range of-426mV to -900mV can be attributed to the dye reduction; thus the color removal was estimated at value of 23.6%. Galvanostatic method to evaluate the effect of current density on solution discoloration process was applied. The color removal at 250min increases of the value of 68.4% calculated at current density of 5mA/cm2 until the value of 73.4% at current density equal to 15 mA/cm2. Degradation process of Methylorange follows a first order kinetics reaction. Rate constants increase with the increase of current densities and their values are: 0.0047min-1, in the case of degradation at a current density of 5 mA/cm2, and 0.006min-1, in the case of degradation at a current density of 15mA/cm2.

Keywords: Methylorange, electrochemical degradation, titanium electrode, kinetics process
  
         
     
         
         
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