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Advanced oxidation of micropollutants in water by photolytic and photocatalytic processes
Photochemical processes and related technologies have been often used in the 20th century for the disinfection of drinking water and wastewater (secondary and tertiary sewage effluents). Recently, direct ultraviolet (UV) photolysis, photocatalysis and advanced oxidation procedures have been widely reported as emerging methods for the removal of organic micropollutants from water. Nowadays, based on the progress made in analytical techniques’ sensitivity, micropollutants such as pharmaceuticals can be determined down to ng L-1 scale in the aquatic environment. There is growing interest in the removal of these contaminants from water, particularly driven by the overall public concern about potential toxic effects they might induce in humans and ecosystems. In this work, the beta-blocker nebivolol has been detected for the first time in effluent samples of 12 wastewater treatment plants (WWTPs) in Germany. The photolytic degradation of nebivolol has been investigated under three different UV sources, namely, UV-C (main emission band at 254 nm), UV-B (main emission band at 312 nm) and UV-A (main emission band at 365 nm) in different matrices: pure water, pure water in the presence of a hydroxyl radical scavenger and in wastewater. During the photodegradation study, no elimination of nebivolol was observed under UV-A radiation. In contrast, nebivolol degradation under UV-B and UV-C radiation followed pseudo first order reaction kinetics, with the highest removal rate under UV-C radiation in pure water (k = 7.8 × 10−4 s−1). Also the degradation mechanism of nebivolol under the UV-B and UV-C radiation has been studied. Three transformation products (TPs) were identified after UV-B and UV-C photolytic degradation using high resolution mass spectrometry. The TPs are formed by the substitution of the fluorine atom from the benzopyran ring with a hydroxyl group. The biologically active part of nebivolol is still preserved in the identified TPs even after two hours of irradiation. The matrices’ pH plays an important role ...
Advanced oxidation of micropollutants in water by photolytic and photocatalytic processes
Photochemical processes and related technologies have been often used in the 20th century for the disinfection of drinking water and wastewater (secondary and tertiary sewage effluents). Recently, direct ultraviolet (UV) photolysis, photocatalysis and advanced oxidation procedures have been widely reported as emerging methods for the removal of organic micropollutants from water. Nowadays, based on the progress made in analytical techniques’ sensitivity, micropollutants such as pharmaceuticals can be determined down to ng L-1 scale in the aquatic environment. There is growing interest in the removal of these contaminants from water, particularly driven by the overall public concern about potential toxic effects they might induce in humans and ecosystems. In this work, the beta-blocker nebivolol has been detected for the first time in effluent samples of 12 wastewater treatment plants (WWTPs) in Germany. The photolytic degradation of nebivolol has been investigated under three different UV sources, namely, UV-C (main emission band at 254 nm), UV-B (main emission band at 312 nm) and UV-A (main emission band at 365 nm) in different matrices: pure water, pure water in the presence of a hydroxyl radical scavenger and in wastewater. During the photodegradation study, no elimination of nebivolol was observed under UV-A radiation. In contrast, nebivolol degradation under UV-B and UV-C radiation followed pseudo first order reaction kinetics, with the highest removal rate under UV-C radiation in pure water (k = 7.8 × 10−4 s−1). Also the degradation mechanism of nebivolol under the UV-B and UV-C radiation has been studied. Three transformation products (TPs) were identified after UV-B and UV-C photolytic degradation using high resolution mass spectrometry. The TPs are formed by the substitution of the fluorine atom from the benzopyran ring with a hydroxyl group. The biologically active part of nebivolol is still preserved in the identified TPs even after two hours of irradiation. The matrices’ pH plays an important role ...
Advanced oxidation of micropollutants in water by photolytic and photocatalytic processes
Salma, Alaa (Autor:in) / Schmidt, Torsten Claus
01.12.2017
Hochschulschrift
Elektronische Ressource
Englisch
Advanced oxidation of micropollutants in water by photolytic and photocatalytic processes
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