Impact of Active Chlorines and •OH Radicals on Degradation of Quinoline Using the Bipolar Electro-Fenton Process

Quinoline is a typical nitrogenous heterocyclic compound, which carcinogenic, teratogenic, and mutagenic to organisms, its wastewater difficult biodegrade directly. The bipolar electro-Fenton process was employed treat quinoline solution. process/reaction conditions were optimized through the single factor experiment. degradation kinetics of chemical oxygen demand (COD) analyzed. To get mechanism pathways quinoline, intermediate products identified by gas chromatograph–mass spectrometer (GC–MS). By using sodium chloride as supporting electrolyte in reaction system with initial pH 3.0, conductivity 15,800 µs/cm, H2O2 concentration 71 mmol/L, current density 30.5 mA/cm2, applied voltage 26.5 V, 75.56% COD decreased indirect oxidation electrogeneration hydroxyl radicals (•OH) active chloric species 20 min. decrease solution followed first order kinetic model. main 2(1H)-quinolinone, 4-chloro-2(1H)-quinolinone, 5-chloro-8-hydroxyquinoline, 5,7-dichloro-8-hydroxyquinoline. Furthermore, two possible proposed, supported Natural charge distribution on intermediates calculated at theoretical level MN15L/6-311G(d).