Browsing by Author "Cordoba Gurrute, Huber"
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Item Efecto de iones carbonato, sulfato y fosfato en la fotooxidación (UV/H2O2) de Losartán(Universidad Santiago de Cali, 2025-12-07) Cordoba Gurrute, Huber; Santiago Lerma, Isabel Cristina; Castro Narváez, Sandra Patricia (Directora)Losartan (LOS) is a widely consumed drug for the treatment of arterial hypertension and diabetic nephropathy; it is a pseudopersistent drug capable of altering the aquatic environment. This study addresses the degradation of LOS by Fenton, Photofenton and homogeneous photocatalysis systems with Fe2+, Al3+ and Cu2+ metal ions, under UV irradiation with LED lamp (280-300nm). The monitoring of LOS degradation was performed by UV spectroscopy at 253 nm. The results were analyzed in terms of percentage of contaminant degradation. The best performing pHs were: pH 8.0 for UV/LOS-H2O2-Fe2+ (88.9%) and pH 6.4 for LOS-H2O2-Cu2+ (67.0%) and LOS-H2O2-Al3+ (89.8%) systems with LOS/Mn+ molar ratios of 357:1, 357:1 and 238:1, respectively. The degradation kinetics were fitted in pseudo first order with rate constants in the Photofenton > Fenton> Photocatalysis processes; with half-life times less than 20.5 min. The addition of CO₃2- ions presented negative synergy in all treatments. However, PO₄3- ions improved the processes with Al3+ as catalyst (99.8% photofenton and 100% removal for fenton) and SO42- ions registered the highest efficiencies in the systems with Fe2+ (100% for photofenton and 70.7 for fenton). The photodegradations with Cu2+ photodegradations were generally superior without addition of anions.. The oxidation techniques performed are based on low-cost systems that can be easily implemented in water treatment systems.