engleski

APPLICATION OF TiO2 BASED PHOTOCATALYTIC FILMS FOR OXIDATION OF ENVIRONMENTAL MICROPOLLUTANTS

Drugs are known for their great effect and application in the treatment and suppression of various diseases in human and veterinary medicine. The development and modernization of science and technologies has led to a constant increase in the production and use of various classes of drugs. Their low concentrations normally present in the environment (low ng/L), complexity of environmental matrices, and different physicochemical properties make their determination difficult. Highly sensitive, selective methods for monitoring pharmaceuticals in the environment are therefore very important and necessary. Liquid chromatography coupled to mass spectrometry, in particular multidimensional mass spectrometry (LC-MSn), offers a powerful alternative combining speed, specificity and sensitivity. To prevent water pollution, photocatalysis is widely used to remove small molecules such as drugs by generating reactive species. This work focuses on the application of high- resolution mass spectrometry analysis (UHPLC-QTOF MS system) with electrospray ionization of the water samples after passing the water sample through the reactor, to the bottom of which a fiber glass mesh with immobilized TiO2 is attached. Based on the recorded results, it was possible to find the optimal support for TiO2 P25- based photocatalytic films and their potential application in the environmental field. We investigated cotton textiles and glass fiber meshes as flexible supports. The methods used to prepare the films on glass fiber meshes included pretreatment with NaOH and fabrication in a microwave oven. Preliminary experiments were conducted with an aqueous solution of 2-HBA in a rectangular open channel reactor at UVA. Environmental application was studied in the same reactor using ciprofloxacin, carbamazepine, and 17ß-estradiol (E2) as model pollutants at UVA and artificial solar radiation. Detailed kinetic studies, including the effects of photon absorption, were performed using recently published models. High resolution mass spectrometry (UHPLC- QTOF MS) was used to elucidate the preliminary structures of the degradation products in treated samples formed under photocatalytic conditions.

photocatalysis, organic micropollutants, UHPLC-QTOF MS

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