<p>Cilj ovog rada bio je ispitivanje mogućnosti primene modifikovanog bentonita kao katalizatora (ferioksalat i Al, Fe-bentonit katalizatori) u Fenton i foto-Fenton procesu uklanjanja tekstilne reaktivne boje Reactive Red 120. Do sada su objavljene studije primene heterogenog Fenton procesa sa različitim koncentracijama gvožđau katalizatorima i sa kompleksom ferioksalata,međutim, njihovo poređenje u smislu efikasnosti obezbojavanja nije istraženo, što je bio jedan od fokusa istraživanja u ovom radu. Osim toga, potencijal sunčeve energije predstavlja 16,7% od ukupno iskoristivog potencijala obnovljivih izvora energije u Srbiji, dok je prosečno sunčevo zračenje u Srbiji oko 40% više od evropskog proseka, čineći ga vrlo zanimljivim za primenu u ovom tipu tretmana. U cilju što boljeg iskorišćenjasunčevog zračenja i unapređenja fotokatalitičkih performansi procesa primenjen je parabolični koncentrišući reaktor, koji je za ovu vrstu procesa prvi put upotrebljavan. Proučavano je u kojoj meri je solarna fotokataliza značajan segment tehnike za tretman otpadnih voda tokom degradacije perzistentnih jedinjenja, kao što je organska azo boja. Takođe, utvrđen je i potencijal fotolize vodonik-peroksida za obezbojavanjem sintetičkog rastvora date boje. Prva faza imala je za cilj sintezu materijala primenom različitih metoda pripreme i<br />konstrukciju solarnog paraboličnog reaktora, koji će se koristiti u Fenton i foto-Fenton procesima degradacije boje Reactive Red 120. Druga faza je podrazumevala karakterizaciju novosintetisanih materijala i optimizaciju procesa fotokatalize primenom Fenton i foto-Fenton procesa i određivanje postignutih efikasnosti primenjenih procesa. Takođe, vršeno je određivanje stepena mineralizacije i identifikacija degradacionih produkata nakon procesa degradacije tekstilne boje Reactive Red 120, kao i primena foto-Fenton procesa na realnom efluentu. Na osnovu dobijenih rezultata tokom primene Fenton procesa i korišćenjem oba tipa katalizatora u periodima niskog i visokog intenziteta zračenja, sa aspekta postizanja visoke efikasnosti obezbojavanja i najmanjeg izluživanja gvožđa,<br />može se zaključiti da je Fenton proces najefikasniji na pH vrednosti 3. AlFeB je pokazao veću reaktivnost čak i pri manje upotrebljenim dozama od0,05 g u odnosu na CuOFeB (0,2 g), kao i mogućnost manje upotrebe vodonik-peroksida od 2,5 mM, za postizanje visoke efikasnosti obezbojavanja i postignut visok stepen mineralizacije. Viši intenzitet sunčevog zračenja omogućava odvijanje reakcije obezbojavanja na višim pH vrednostima primenom oba katalizatora tokom fotoFenton procesa. Ovo je posebno izraženo kod CuOFeB tokom letnjeg perioda (pH 7), čak i pri nižim dozama katalizatora. Međutim, najveći udeo u procesu obezbojavanja pri upotrebi CuOFeB katalizatora ima fotoliza vodonik-peroksida (80%). Suprotno ovim rezultatima, pri istim reakcionim uslovima, potrebna je veća količina AlFeB katalizatora (0,1 g) i niža pH vrednost reakcije, a efikasnost procesa značajno zavisi od početne koncentracije H<sub> 2</sub>O<sub>2</sub>. Činjenica da se u pripremi katalizatora koristio bentonit kao prirodan, širokorasprostranjen i jeftin materijal i solarno zračenje kao obnovljiv i alternativni izvor fotona, gore navedene rezultate bi trebalo uzeti u obzir prilikom analize troškova efikasnosti primenjenog procesa. Takođe, primena unapređenih procesa oksidacije se razmatra kao predlog za najbolju dostupnu tehniku kada je u pitanju tretman otpadne vode tekstilne industrije, dok se kao dodatne nove tehnike uzimaju u obzir foto-oksidacije i ispitivanje mogućnosti njihove primene u prečišćavanju otpadne vode u tercijarnom tretmanu na poluindustrijskim sistemima.<br /> </p> / <p>The aim of this study was to investigate the decolorization efficiency of Reactive Red 120 (RR120) synthetic solution using ferrioxalate (CuOFeB) and Al, Fe-bentonite (AlFeB) catalysts in Fenton and photo-Fenton process. So far, studies of the application of a solar-assisted heterogeneous Fenton process with various Fe loaded catalysts and with ferrioxalate complex have been published, but according to the author’s knowledge, their comparison in terms of efficacy of decolorization has not been performed, which was one of the focus of research in this paper. In addition, the potential of solar energy represents 16.7% of the total utilized potential of renewable energy sources in Serbia, while the average solar radiation in Serbia is about 40% higher than the European average, making it very interesting for application in this type of treatment. In order to optimize the use of solar radiation and to improve the photocatalytic performance of the process, parabolic concentrating reactor was used for the first time. As a significant segment of the wastewater treatment technique during the degradation of persistent compounds, such as organic azo dye, solar photocatalysis was studied. Also, the potential of photolysis of hydrogen peroxide for decolorization of the synthetic dye solution was determined. Aim of the first phase of the study was synthesizing materials by using different methods of preparation, and construction of a solar parabolic reactor, which will be used in Fenton andphoto-Fenton dye degradation processes. The second phase involved the characterization of newlysynthesized materials and the optimization of the photocatalytic process by applying Fenton and photo-Fonton processes, as well as the determination of achieved efficiency of the appliedprocesses. Also, the degree of mineralization and the identification of degradation products after applied processes were determined. Application of the photo-Fenton process on a real effluent was conducted as well. Based on the obtained results during Fenton process and using both types of catalysts in periods of low and high intensity of radiation, from the aspect of achieving high efficiency of decolorization and smallest iron leaching, it can be concluded that the Fenton process is most effective at pH 3. AlFeB showed greater reactivity even at less used doses of 0.05 g, compared to CuOFeB (0.2 g), and the possibility of using less hydrogen peroxide (2.5 mM), achieving high efficiency and a high degree of mineralization. Higher intensity of solar radiationallows the reaction to be carried out at higher pH values when using both catalysts during the photo-Fenton process. This is particularly pronounced largest part in the decolorization process using the CuOFeB catalyst has a photolysis of hydrogen peroxide (80%). Contrary to these results, under the same reaction conditions, a higher doses of AlFeB catalyst (0.1 g) is needed at lower pH value of the reaction, and the process efficiency is significantly dependent on the initial concentration of H <sub>2</sub>O<sub>2</sub>. The fact that in the preparation of the catalysts bentonite as a natural, abundant, inexpensive material was used and solar radiation as a renewable and alternative source of photons, the above results should be taken into account in the cost-effectiveness analysis of the applied process. Also, the application of advanced oxidation processes is considered as a proposal for the best available technique when it comes to the treatment of wastewater from the textile industry, while as additional new techniques, photooxidation is considered as a candidate and the possibility of their application in the treatment of wastewater in tertiary treatment on semi-industrial systems.</p>
| Identifer | oai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)110666 |
| Date | 13 August 2019 |
| Creators | Pucar Milidrag Gordana |
| Contributors | Bečelić-Tomin Milena, Dalmacija Božo, Maletić Snežana, Prica Miljana, Kerkez Djurdja |
| Publisher | Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad |
| Source Sets | University of Novi Sad |
| Language | Serbian |
| Detected Language | Unknown |
| Type | PhD thesis |
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