In this study, electrochemical oxidation of Bromothymol blue (BTB) was studied in an aqueous medium (pH = 3) by electro-Fenton process (EFP). This chemical compound belongs to the family of sulfone phthalein, widely used for dyeing in the textile industry. EFP generates in a catalytic way hydroxyl radicals (•OH) which are powerful oxidant species (E
a b s t r a c tThe discoloration of a textile dye derivative bromothymol blue (BTB) in aqueous solution with Fenton process (FP) has been studied. The performance of the FP depends on various operating parameters such as the initial concentration of hydrogen peroxide [H 2 O 2 ] 0 , the initial ferrous ion concentration [Fe 2+ ] 0 and the pH of the reaction medium. The optimal conditions of these variables, for the discoloration of BTB with FP, have been investigated by the use of Doehlert matrix. It has been demonstrated that under the optimal conditions ([H 2 O 2 ] 0 = 1.61 mM, [Fe 2+ ] 0 = 0.18 mM and pH = 2.85), FP leads to a maximum discoloration yield of BTB (67.58%± 4.39) after 1 h of treatment. These values were also experimentally validated. The obtained discoloration yield was 70.4%. After 6 h of BTB treatment in aqueous solution by FP, the color removal achievement was 91.54% and, the chemical oxygen demand (COD) removal reached 63%. Carboxylic acids and inorganic ions have been identified and followed during the mineralization of BTB with FP.
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