The results presented herein demonstrate the efficacy of the electrochemical process using a Ti/Ru 0.3Ti 0.7O 2 anode for the remediation of wastewater containing the antibiotic SMX.Ībellán MN, Bayarri B, Giménez J, Costa J (2007) Photocatalytic degradation of sulfamethoxazole in aqueous suspension of TiO 2. Analysis of the total organic carbon content revealed that the antibiotic was partially mineralized under the conditions employed and some inorganic ions, including NO 3 − and SO 4 2−, could be identified. The degradation followed various routes involving cleavage of the oxazole and benzene rings by hydroxyl and/or chlorine radicals, processes that could occur before or after rupture of the N-S bond, followed by oxidation of the remaining moieties. Nine major intermediates of the reaction were identified by LC-ESI-Q-TOF-MS (e.g., C 6H 9NO 2S ( m/ z = 179), C 6H 4NOCl ( m/ z = 141), and C 6H 6O 2 ( m/ z = 110)). Almost complete (98 %) degradation of SMX could be achieved within 30 min of electrolysis in 0.1 mol L −1 NaCl solution at pH 3 with applied current densities ≥20 mA cm −2. The kinetics of SMX degradation was determined as a function of electrolyte composition, applied current density, and initial pH. In this study, the electrochemical oxidation of the widely used antibiotic sulfamethoxazole (SMX) was investigated using a commercial mixed oxide anode (Ti/Ru 0.3Ti 0.7O 2) and a single compartment filter press-type flow reactor. The appearance of pharmaceutical compounds and their bioactive transformation products in aquatic environments is becoming an issue of increasing concern.
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