Authors: José M Aquino Romeu C RochaFilho Nerilso Bocchi Sonia R Biaggio
Publish Date: 2010/04/10
Volume: 40, Issue: 10, Pages: 1751-1757
Abstract
The electrochemical degradation of the anthraquinonic dye Acid Blue 62 in a filterpress reactor on a Ti/Pt/βPbO2 anode was investigated using the response surface methodology with the variables current density pH NaCl and temperature The system’s modeling was carried out with the charge required for 90 decolorization Q 90 and the chemical oxygen demand removal percentage after a 30 min electrolysis COD 30 with good correlations between predicted and observed values Best conditions for decolorization were attained in acidic solutions pH = 4 with medium to high NaCl 10–20 g L−1 and lower temperature due to the prevalent oxidant species HOCl and Cl2 Optimal conditions for COD 30 removal were attained at high current densities in pH 5 solutions with high NaCl when the prevalent oxidant species are HOCl and OCl− The lowest charge per unit volume of the electrolyzed solution necessary for total mineralization was attained at pH 11Financial support and scholarships from the Brazilian funding agencies CNPq and FAPESP are gratefully acknowledged Quimanil Brazil is acknowledged for supplying the dye sample Access to several apparatuses provided by Professor Luis A M Ruotolo DEQUFSCar and fruitful discussions on RSM with Professor Edenir Rodrigues PereiraFilho DQUFSCar are also gratefully acknowledged
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