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Solutions of the synthetic dye Acid Red 211 (AR211), commonly used in many industries, were comparatively degraded using different supporting electrolytes under current-controlled electrolysis conditions. The efficiency of the electro-oxidation (EOx) approach with boron doped diamond electrodes (EOx/BDD) was examined by applying 100, 200, 300 and 400 mA with HClO 4, H 2 SO 4 or Na 2 SO 4 as a supporting electrolyte. Under similar experimental conditions, a diamond electro-Fenton (EF/BDD) system was used for treating synthetic dye solutions and was compared with the removal efficiencies obtained by EOx/BDD. The results clearly showed that when AR211 was oxidized by employing the EF/BDD process with generation of free radical dot OH from the electrogeneration production of hydrogen peroxide (H 2 O 2) and addition of Fe 2+, the oxidizing power increased to 97% under the best conditions …