The effects of surface oxidation and fluorination of boron-doped diamond anodes on perchlorate formation and organic compound oxidation

摘要: Abstract This research investigated the effects of surface functional groups on both rates organic compound oxidation (phenol, p-nitrophenol, benzoquinone, and oxalic acid) perchlorate (ClO 4 − ) formation at boron-doped diamond (BDD) film anodes 20 °C. X-ray photoelectron spectroscopy measurements determined that various oxygenated (e.g., C-OH, C=O, COOH) were incorporated BDD by applying an anodic ageing process, fluorine C-F, -C n F 2n+1 electrochemical aqueous perfluorooctanoic acid solutions. Batch experiments revealed ClO via 3 was highly variable during ageing, which attributed to changes in groups, while not significantly affected. The fluorinated electrode showed a lower rate (19 ± 4 μmoles m −2  min −1 compared (436 ± 26 μmoles m indicating limits production. Measurement response Fe(CN) 6 3−/4− redox couple using cyclic voltammetry impedance indicated likely result dipole-dipole interactions between negatively charged atoms steric hindrance caused perfluorocarbon chains. effect along with hydrophobicity resulted (96% decrease) slightly enhancing measured hydrophobic compounds. use benzoquinone as OH probe confirmed fluorination process did inhibit 2212 ± 183 μmoles m 2926 ± 201 μmoles m min electrode. Density theory calculations perfluorinated carbon radicals ( C varying chain lengths (n = 1 7) feasible, edge sites (=C-C more electrochemically stable than planar (≡C-C ).