20.500.12556/RUL-135016 Fe$^{2+}$ and UV catalytically enhanced ozonation of selected environmentally persistent antibiotics The aim of the study was to determine oxidation potential of selected persistent, environmentally relevant antibiotics (Amoxicillin, Levofloxacin, and their mixture with Vancomycin) to reduce their environmental emissions. Ozonation (O$_3$) and indirect ozonation at pH 9.5 (O$_3$/pH$_{9.5}$) were catalytically enhanced by addition of Fe$^{2+}$ (O$_3$/Fe$^{2+}$) and photocatalytic ozonation in combination with Fe$^{2+}$ and UV-A black light (O$_3$/Fe$^{2+}$/UV) at two temperatures using total organic carbon (TOC) and chemical oxygen demand (COD) to identify formation of by-products. Oxidative degradation followed pseudo-first order consecutive reactions. Initial phase of oxidation was more intensive than mineralisation at 21 and 40 °C: up to 57.3% and 69.2%, respectively. After 120 min mineralization at 21 °C was up to 64.9% while at 40 °C it was up to 84.6%. Oxidation reached up to 86.6% and 93.4% at 21 °C and 40 °C, respectively. The most efficient processes were indirect ozonation at pH 9.5 (O$_3$/pH$_{9.5}$) (up to 93.4%) and photocatalytic enhanced ozonation with Fe$^{2+}$ and UV-A black light (O$_3$/Fe$^{2+}$/UV) (up to 89.8%). The lowest efficiency was determined in experiments with direct ozonation (up to 75.5%). Amoxicillin was the only one completely mineralised. Study confirmed that ozonation with addition of Fe$^{2+}$ and UV radiation has the potential to improve efficiency of the antibiotic-removal processes. Further experiments varying amounts of Fe$^{2+}$ and other experimental conditions should be accomplished to set up more general methodological approach for reduction of antibiotics emissions. Amoxicillin antibiotics catalyst Levofloxacin ozone reaction constant Vancomycin amoksicilin antibiotiki katalizator levofloksacin ozon reakcijska konstanta vankomicin true false true Angleški jezik Slovenski jezik Članek v reviji 2022-02-17 11:28:55 2022-02-17 11:28:55 2022-09-14 04:11:12 0000-00-00 00:00:00 2021 0 0 17 str. iss. 3, art. 521 Vol. 9 Mar. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.094.3-926.214:615.33 2227-9717 10.3390/pr9030521 55176707 RAZ_Zgajnar_Gotvajn_Andreja_2021.pdf RAZ_Zgajnar_Gotvajn_Andreja_2021.pdf 1 34CEE3DBB55BF3E363BD0E78AFCBE735 13c12f2cd7371eaf206ae01403585c23cbdefaf3cf60ba476792109367404013 864b1a5b-8fdc-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153834 https://www.mdpi.com/2227-9717/9/3/521 1 2a71901f-8fdc-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153833 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0