Abstract
This paper presents the study of the electrochemical oxidation of the pesticide cypermethrine at a SnO2. In this work, the effect of using different supporting electrolytes (NaCl, NaOH, Na2CO3, H2SO4 and Na2SO4) during the galvanostatic electrolysis of cypermethrine was investigated. It was observed that the removal of cypermethrine and chemical oxygen demand (COD) was only achieved at appreciable rates when NaCl was used as the supporting electrolyte, due to the oxidising species formed in this electrolyte. Variation of the NaCl concentration demonstrated that, although only low concentrations of NaCl are necessary to result in the complete removal of cypermethrine in solution. The achieved reductions of % COD were 75% for 2% NaCl. Examination of the applied current density indicates that the efficiency of COD removal reaches a maximum at 80 mA.cm−2. in this work presents, the effect of temperature and pesticide concentration of cypermethrine are investigated. The high efficiency of this technology can be explained in terms of the direct electro-oxidation at the SnO2 surface and the oxidation carried out by hydroxyl radicals (OH.) and other electro-generated oxidants (ClO-).