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1.
Removal of diclofenac from water by zeolite-assisted advanced oxidation processes
Urška Lavrenčič Štangar, Daria Juretic Perisic, Vanja Gilja, Mirjana Novak Stankov, Zvonimir Katancic, Hrvoje Kusic, Dionysios D. Dionysiou, Ana Loncaric Bozic, 2016, original scientific article

Found in: ključnih besedah
Summary of found: ...Diclofenac, FeZSM5, Biodegradability, Toxicity, Catalyst stability...
Keywords: Diclofenac, FeZSM5, Biodegradability, Toxicity, Catalyst stability
Published: 24.02.2016; Views: 1555; Downloads: 0
.pdf Fulltext (3,50 MB)

2.
Diclofenac removal by simulated solar assisted photocatalysis using TiO2-based zeolite catalyst; mechanisms, pathways and environmental aspects
Dionysios D. Dionysiou, Urška Lavrenčič Štangar, Sandra Babich, Hrvoje Kušić, Martina Biosic, Daria Juretic Perisic, Subhan Salaeh, Ana Lončarić Božić, 2016, original scientific article

Abstract: The study explores the potential of immobilized TiO2-based zeolite composite photocatalyst (TiO2-FeZ) made of commercial AEROXIDE TiO2 P25 and iron-exchanged zeolite of ZSM5 type (FeZ), for solar assisted treatment of diclofenac (DCF), pharmaceutical included in the ‘‘watch list” during last prioritization in water legislation by EU. In this study the efficiency of applied photocatalytic treatment, solar/TiO2-FeZ/H2O2, of DCF water solution was evaluated on basis of DCF removal and conversion kinetics, as well as the changes of common parameters for assessing water quality. Hence, the changes in the removal and mineralization of overall organic content, biodegradability, toxicity to Vibrio fischeri, dechlorination of DCF and its formed by-products, were monitored during the treatment. The obtained data were correlated with the evolution of DCF by-products, identified and monitored during the treatment by HPLC/MSMS analysis. In order to estimate the influence of water matrix, all experiments were performed in the presence of chloride or sulphate as counter ions. The obtained data revealed that degradation mechanism of DCF by applied treatment process using immobilized TiO2-FeZ includes the adsorption onto photocatalyst surface and consequent degradation. The contribution of homogeneous Fenton reaction due to leached iron ions was found to be negligible. The adsorption and degradation pathway of DCF were influenced by the type of counter ions, which was reflected in the observed changes of water quality parameters.
Found in: ključnih besedah
Summary of found: ...the removal and mineralization of overall organic content, biodegradability, toxicity to Vibrio fischeri, dechlorination of DCF...
Keywords: Solar photocatalysis, TiO2-FeZ catalyst, Diclofenac, Degradation pathway, Biodegradability, Toxicity
Published: 21.07.2016; Views: 1877; Downloads: 0
.pdf Fulltext (2,10 MB)

3.
Comparative analysis of UV-C/H2O2 and UV-A/TiO2 processes for the degradation of diclofenac in water
Urška Lavrenčič Štangar, Hrvoje Kušić, Marin Kovacic, Daria Juretic Perisic, Vedrana Marin, Ana Lončarić Božić, 2016, original scientific article

Abstract: The study investigates the treatment of diclofenac (DCF), a pharmaceutical included in the first watch list of the European Water Framework Directive as a new potential priority substance in water. Since the conventional wastewater treatment technologies do not efficiently remove DCF, advanced treatment technologies capable of its complete removal or destruction of its biological activity, need to be evaluated and eventually employed. For that purpose, typical representatives of photooxidative and photocatalytic advanced oxidation processes were applied. The effectiveness of UV-C/H2O2 and UV-A/TiO2 were compared regarding DCF conversion and mineralization kinetics, water quality parameters for assessing biodegradability and toxicity. In spite of similar biodegradability profiles, the obtained results indicate different DCF degradation pathways, which are reflected in different profiles of toxicity towards Vibrio fischeri. The observed DCF conversion and mineralization kinetics revealed the benefits of UV-C/H2O2 process. However, lower toxicity favored the application of photocatalytic over photooxidative treatment for DCF removal.
Found in: ključnih besedah
Summary of found: ...and mineralization kinetics, water quality parameters for assessing biodegradability and toxicity. In spite of similar biodegradability...
Keywords: Diclofenac, Photooxidation, Photocatalysis, Biodegradability, Toxicity
Published: 21.07.2016; Views: 1477; Downloads: 0
.pdf Fulltext (496,03 KB)

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