López Vinent, NúriaCruz Alcalde, AlbertoRomero, L. E.Chavez, M. E.Marco Buj, PilarGiménez Farreras, JaumeEsplugas Vidal, Santiago2022-05-182022-05-182019-12-150304-3894https://hdl.handle.net/2445/185795The photo-Fenton process, with UV-A LED (λ=380-390, 390-400 and 380-400 nm) has demonstrated to be effective in the abatement of a target micropollutant, such as diphenhydramine hydrochloride (DPH). Different concentrations of iron (Fe2+) and H2O2 were tested and monitored, and the best results in DPH removal were obtained for the highest concentrations of both iron (II) and H2O2 (10 mg Fe2+/L - 150 mg H2O2/L). The evolution of iron and peroxide concentration was also monitored. Kinetic studies showed that dark Fenton process prevails at the beginning of the experiment, when Fe2+ concentration is higher. However, after these initial moments, the prevailing process is photo-Fenton and, in addition, wavelength radiation plays an important role. Concerning the effect of radiation, four LEDs (4.2 W total power) were used, emitting radiation in the wavelength range between 380-390 or 390-400 nm. Similar results were obtained in both cases in DPH removal by photo-Fenton (30 min for total elimination). However, a synergistic effect was observed when two LEDs of 380-390 nm and two LEDs of 390-400 nm were used. Total power was the same (4.2 W) in each experimental condition, but the increase in the wavelength range to 20 nm (380-400 nm) produces an increase in the rate of DPH removal, achieving its total elimination at 15 min. This fact, with the use of a simple radiation model, reveals the important role that radiation plays in the photo-Fenton process. Finally, the formed intermediates were determined and some reaction pathways were proposed.application/pdfengcc-by-nc-nd (c) Elsevier B.V., 2019https://creativecommons.org/licenses/by-nc-nd/4.0/Intermediaris (Química)ContaminantsFerroIntermediates (Chemistry)PollutantsIroninfo:eu-repo/semantics/article6947092022-05-18info:eu-repo/semantics/openAccess