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UV-A LED Heterogeneous Photocatalysis of Pharmaceutical Residues: Optimalization of the Process and Effect of Matrices
Authors: Trousil Vojtěch | Blažková Zuzana | Smolný Marek | Machalický Oldřich | Palarčík Jiří | Cakl Jiří
Year: 2017
Type of publication: ostatní - článek ve sborníku
Name of source: 5th European Conference on Environmental Applications of Advanced Oxidation Processes : book of abstracts
Publisher name: Vysoká škola chemicko-technologická v Praze
Place: Praha
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
eng UV-A LED Heterogeneous Photocatalysis of Pharmaceutical Residues: Optimalization of the Process and Effect of Matrices Photocatalysis has been shown to be an effective method for removing pharmaceuticals from water. Pharmaceutical residues were detected at ng/L or low μg/L levels in almost all types of water matrices including sewage, surface and groundwaters. In some cases at these levels adverse effects may occur. Diclofenac and naproxen belong to most frequently detected non steroidal anti-inflammatory drugs (NSAIDs). These two pharmaceuticals were also found in fish tissues. This work focuses on heterogeneous photocatalysis decomposition of diclofenac and naproxen using dispersed TiO2 (AV-01, Precheza, Czech Republic) anatase type catalyst in 4L batch reactor. The TiO2-catalyzed photooxidation process typically requires a light source with a wavelength less than 388 nm. Therefore 6.5 W and 365 nm UV-A LED diodes (Luminus, USA) were used as the control light source. The density of photon flow and emission peak were evaluated by ferrioxalate actinometry and fluorescence spectrophotometry. Crucial proces parameters, i.e. type and amount of the catalyst, stirring and pH were also evaluated. Optimal options were applied on samples with real water matrices (surface river water and municipal waste water) spiked with 0.5 mg/L of diclofenac or naproxen. At optimal process conditions almost 100% drug conversions were observed in tap water samples. In the case of real water matrices the degradations of pharmaceuticals were lower during photocatalytic process. Removal rates of both pharmaceuticals were 90 % in surface water and 50% in waste water. Water quality parameters such as CODCr, turbidity at 254 nm and TOC were also partially reduced. The results demonstrate the low selectivity of the photocatalytic process used, since conversions are inversely proportional to the content of organic substances in the matrice. Diclofenac; naproxen; heterogeneous photocatalysis

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