Production of free radicals by the Co 2+ /Oxone system to carry out diclofenac degradation in aqueous medium

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 ox...

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Bibliographic Details
Published inWater science and technology Vol. 78; no. 10; p. 2131
Main Authors Rodríguez-Narváez, Oscar M, Serrano-Torres, Oracio, Wrobel, Kazimierz, Brillas, Enric, Peralta-Hernandez, Juan M
Format Journal Article
LanguageEnglish
Published England 01.12.2018
Subjects
Cobalt - chemistry
Diclofenac - chemistry
Free Radicals
Kinetics
Models, Chemical
Sulfuric Acids - chemistry
Water Pollutants, Chemical - chemistry
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Summary: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.
ISSN:0273-1223