Application of electrochemical advanced oxidation to bisphenol A degradation in water. Effect of sulfate and chloride ions

摘要: Electrochemical oxidation with electrogenerated H2O2 (EO- H2O2), electro-Fenton (EF), photoelectro-Fenton (PEF) and solar PEF (SPEF) have been applied to mineralize bisphenol A solutions in 0.050 M Na2SO4 or 0.008 M NaCl + 0.047 M at pH 3.0. The assays were performed an undivided cell a boron-doped diamond (BDD) anode air-diffusion cathode for continuous production. SPEF processes yielded almost total mineralization due the potent synergistic action of generated hydroxyl radicals active chlorine, conjunction photolytic UV radiation. higher intensity rays from sunlight explained superior ability SPEF. effect current density was studied all treatments, whereas role concentration examined PEF. Bisphenol abatement followed pseudo-first-order kinetics, which very quick since light favored large production Fenton's reaction. Eight non-chlorinated six chlorinated aromatics identified as primary products chloride matrix. Ketomalonic, tartronic, maleic oxalic acids detected final short-chain aliphatic carboxylic acids. stability Fe(III)-oxalate complexes EF compared their fast photomineralization accounted by power latter processes.