Rodríguez-Narváez Oscar M, Serrano-Torres Oracio, Wrobel Kazimierz, Brillas Enric, Peralta-Hernandez Juan M
Departamento de Química, DCNE, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, Guanajuato, C.P. 36040, Mexico E-mail:
Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
Water Sci Technol. 2018 Dec;78(10):2131-2140. doi: 10.2166/wst.2018.489.
This paper reports the degradation of a solution of 0.314 mM diclofenac (DCF), while using 5-15 mM Oxone as oxidizing agent with the catalytic action of 0.05-0.2 mM Co. The best performance was obtained for 10 mM Oxone and 0.2 mM Co, achieving the total DCF abatement and 77% removal of chemical oxygen demand after 30 min. Oxidizing of sulfate (SO ) and hydroxyl (•OH) radicals was formed by the Co/Oxone system. Oxone was firstly oxidized to persulfate ion that was then quickly converted into the above free radicals. For Oxone contents ≥10 mM, the decay of DCF concentration followed a second-order kinetic reaction, but the apparent rate constant changed with the Co concentration used. High-performance liquid chromatography (HPLC) analysis of treated solutions showed the formation of some intermediates, whereas oxalic acid was identified as the prevalent final short-linear carboxylic acid by ion-exclusion HPLC.
