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The aim of this study was to evaluate a modified photo-Fenton procedure as a suitable advanced oxidative process to degrade antibiotics in aqueous solutions. The classical photo-Fenton procedure was modified using a photo-catalytic reactor with continuous recirculation, which was equipped with a high pressure cylindrically shaped mercury lamp centrally and coaxially positioned and surrounded by iron mesh. The oxidation of the organic substrate could occur simultaneously through homogeneous and heterogeneous photocatalytic mechanisms due to Fe²⁺ ions from the solution and Fe⁰/Fe^2+/3+ species formed on the surface of the iron mesh. The antibiotic degradation process was studied by monitoring the organic substrate concentration using chemical oxygen demand (COD), total organic carbon (TOC), high-performance liquid chromatography (HPLC) and Liquid chromatography coupled with mass …