Electrochemical degradation of clofibric acid in water by anodic oxidation Comparative study with platinum and boron-doped diamond electrodes

摘要: Aqueous solutions containing the metabolite clofibric acid (2-(4-chlorophenoxy)-2-methylpropionic acid) up to close saturation in pH range 2.0–12.0 have been degraded by anodic oxidation with Pt and boron-doped diamond (BDD) as anodes. The use of BDD leads total mineralization all media due efficient production oxidant hydroxyl radical (OH). This procedure is then viable for treatment wastewaters this compound. effect pH, apparent current density, temperature concentration on degradation rate, consumed specific charge efficiency has investigated. Comparative yields poor decontamination complete release stable chloride ion. When used, ion oxidized Cl2. Clofibric more rapidly destroyed than BDD, indicating that it strongly adsorbed surface enhancing its reaction OH. Its decay kinetics always follows a pseudo-first-order rate constant each anode increases increasing being practically independent concentration. Aromatic products such 4-chlorophenol, 4-chlorocatechol, 4-chlororesorcinol, hydroquinone, p-benzoquinone 1,2,4-benzenetriol are detected gas chromatography–mass spectrometry (GC–MS) reversed-phase chromatography. Tartronic, maleic, fumaric, formic, 2-hydroxyisobutyric, pyruvic oxalic acids identified generated carboxylic ion-exclusion These remain solution using Pt, but they completely converted into CO2 BDD. A pathway involving these intermediates proposed.