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Primena modifikovanog bentonita kao katalizatora u Fenton i foto-Fenton procesu uklanjanja tekstilne reaktivne boje / Application of modified bentonite as catalyst in Fenton and photo-Fenton removal process of textile reactive dye

<p>Cilj&nbsp; ovog&nbsp; rada&nbsp; bio&nbsp; je&nbsp; ispitivanje&nbsp; mogućnosti&nbsp; primene&nbsp; modifikovanog&nbsp; bentonita&nbsp; kao katalizatora&nbsp; (ferioksalat&nbsp; i&nbsp; Al,&nbsp; Fe-bentonit&nbsp; katalizatori)&nbsp; u&nbsp; Fenton&nbsp; i&nbsp; foto-Fenton&nbsp; procesu&nbsp; uklanjanja tekstilne&nbsp; reaktivne&nbsp; boje&nbsp; Reactive&nbsp; Red&nbsp; 120.&nbsp; Do&nbsp; sada&nbsp; su&nbsp; objavljene&nbsp; studije&nbsp; primene&nbsp; heterogenog Fenton procesa sa različitim koncentracijama gvožđau katalizatorima i sa kompleksom ferioksalata,međutim, njihovo poređenje u smislu efikasnosti obezbojavanja nije istraženo, &scaron;to je bio jedan od fokusa&nbsp; istraživanja&nbsp; u&nbsp; ovom&nbsp; radu.&nbsp; Osim&nbsp; toga,&nbsp; potencijal&nbsp; sunčeve&nbsp; energije&nbsp; predstavlja&nbsp; 16,7%&nbsp; od ukupno&nbsp; iskoristivog&nbsp; potencijala&nbsp; obnovljivih&nbsp; izvora&nbsp; energije&nbsp; u&nbsp; Srbiji,&nbsp; dok&nbsp; je&nbsp; prosečno&nbsp; sunčevo zračenje&nbsp; u&nbsp; Srbiji&nbsp; oko&nbsp; 40%&nbsp; vi&scaron;e&nbsp; od&nbsp; evropskog&nbsp; proseka,&nbsp; čineći&nbsp; ga&nbsp; vrlo&nbsp; zanimljivim&nbsp; za&nbsp; primenu&nbsp; u ovom tipu tretmana. U cilju &scaron;to boljeg iskori&scaron;ćenjasunčevog zračenja i unapređenja fotokatalitičkih performansi&nbsp; procesa&nbsp; primenjen&nbsp; je&nbsp; parabolični&nbsp; koncentri&scaron;ući&nbsp; reaktor,&nbsp; koji&nbsp; je&nbsp; za&nbsp; ovu&nbsp; vrstu&nbsp; procesa prvi put upotrebljavan. Proučavano je u kojoj meri je solarna fotokataliza značajan segment tehnike za tretman otpadnih voda tokom degradacije perzistentnih jedinjenja, kao &scaron;to je organska azo boja. Takođe, utvrđen je i potencijal fotolize vodonik-peroksida za obezbojavanjem sintetičkog rastvora date&nbsp; boje.&nbsp; Prva&nbsp; faza&nbsp; imala&nbsp; je&nbsp; za&nbsp; cilj&nbsp; sintezu&nbsp; materijala&nbsp; primenom&nbsp; različitih&nbsp; metoda&nbsp; pripreme&nbsp; 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, vr&scaron;eno je određivanje stepena mineralizacije i identifikacija degradacionih produkata nakon procesa degradacije tekstilne boje Reactive Red 120, kao&nbsp; i&nbsp; primena&nbsp; foto-Fenton&nbsp; procesa&nbsp; na&nbsp; realnom&nbsp; efluentu.&nbsp; Na&nbsp; osnovu&nbsp; dobijenih&nbsp; rezultata&nbsp; tokom primene Fenton procesa i kori&scaron;ćenjem oba tipa katalizatora u periodima niskog i visokog intenziteta zračenja,&nbsp; sa&nbsp; aspekta&nbsp; postizanja&nbsp; visoke&nbsp; efikasnosti&nbsp; obezbojavanja&nbsp; i&nbsp; najmanjeg&nbsp; izluživanja&nbsp; gvožđa,<br />može&nbsp; se&nbsp; zaključiti&nbsp; da&nbsp; je&nbsp; Fenton&nbsp; proces&nbsp; najefikasniji&nbsp; na&nbsp; pH&nbsp; vrednosti&nbsp; 3.&nbsp; AlFeB&nbsp; je&nbsp; pokazao&nbsp; veću reaktivnost čak i pri manje upotrebljenim dozama od0,05 g u odnosu na CuOFeB (0,2 g), kao i mogućnost&nbsp; manje&nbsp; upotrebe&nbsp; vodonik-peroksida&nbsp; od&nbsp; 2,5&nbsp; mM,&nbsp; za&nbsp; postizanje&nbsp; visoke&nbsp; efikasnosti obezbojavanja i postignut visok stepen mineralizacije. Vi&scaron;i intenzitet sunčevog zračenja omogućava odvijanje reakcije obezbojavanja na vi&scaron;im pH vrednostima primenom oba katalizatora tokom fotoFenton&nbsp; procesa.&nbsp; Ovo&nbsp; je&nbsp; posebno&nbsp; izraženo&nbsp; kod&nbsp; CuOFeB&nbsp; tokom&nbsp; letnjeg&nbsp; perioda&nbsp; (pH&nbsp; 7),&nbsp; čak&nbsp; i&nbsp; pri nižim dozama katalizatora. Međutim, najveći udeo u&nbsp; procesu obezbojavanja pri upotrebi CuOFeB katalizatora ima fotoliza vodonik-peroksida (80%). Suprotno ovim rezultatima, pri istim reakcionim uslovima,&nbsp; potrebna&nbsp; je&nbsp; veća&nbsp; količina&nbsp; AlFeB&nbsp; katalizatora&nbsp; (0,1&nbsp; g)&nbsp; i&nbsp; niža&nbsp; pH&nbsp; vrednost&nbsp; reakcije,&nbsp; a efikasnost&nbsp; procesa&nbsp; značajno&nbsp; zavisi&nbsp; od&nbsp; početne&nbsp; koncentracije&nbsp; H<sub> 2</sub>O<sub>2</sub>.&nbsp; Činjenica&nbsp; da&nbsp; se&nbsp; u&nbsp; pripremi katalizatora koristio bentonit kao prirodan, &scaron;irokorasprostranjen i jeftin materijal i solarno zračenje kao obnovljiv i alternativni izvor fotona, gore navedene rezultate bi trebalo uzeti u obzir prilikom analize tro&scaron;kova efikasnosti primenjenog procesa. Takođe, primena unapređenih procesa oksidacije se&nbsp; razmatra&nbsp; kao&nbsp; predlog&nbsp; za&nbsp; najbolju&nbsp; dostupnu&nbsp; tehniku&nbsp; kada&nbsp; je&nbsp; u&nbsp; pitanju&nbsp; tretman&nbsp; otpadne&nbsp; vode tekstilne industrije, dok se kao dodatne nove tehnike uzimaju u obzir foto-oksidacije i ispitivanje mogućnosti&nbsp; njihove&nbsp; primene&nbsp; u&nbsp; preči&scaron;ćavanju&nbsp; otpadne&nbsp; vode&nbsp; u&nbsp; tercijarnom&nbsp; tretmanu&nbsp; na poluindustrijskim sistemima.<br />&nbsp;</p> / <p>The aim of this study was to investigate the decolorization efficiency of Reactive Red 120&nbsp; (RR120) synthetic solution using ferrioxalate (CuOFeB) and Al, Fe-bentonite (AlFeB) catalysts in&nbsp; Fenton&nbsp; and&nbsp; photo-Fenton&nbsp; process.&nbsp; So&nbsp; far,&nbsp; studies&nbsp; of the&nbsp; application&nbsp; of&nbsp; a&nbsp; solar-assisted&nbsp; heterogeneous Fenton process with various Fe loaded catalysts and with ferrioxalate complex have&nbsp; been published, but according to&nbsp;&nbsp; the author&rsquo;s knowledge, their comparison in terms of efficacy of&nbsp; decolorization&nbsp; has&nbsp; not&nbsp; been&nbsp; performed,&nbsp; which&nbsp; was&nbsp; one&nbsp; of&nbsp; the&nbsp; focus&nbsp; of&nbsp; research&nbsp; in&nbsp; this&nbsp; paper.&nbsp; In addition, the potential of solar energy represents&nbsp; 16.7% of the total utilized&nbsp; potential of renewable&nbsp; energy sources in Serbia, while the average solar radiation in&nbsp; Serbia is&nbsp; about 40% higher than the&nbsp; European average, making it very interesting for&nbsp; application in this type of treatment. In order to&nbsp; optimize the use of solar radiation and to improve&nbsp; the photocatalytic performance of the process, parabolic&nbsp; concentrating&nbsp; reactor&nbsp; was&nbsp; used&nbsp; for&nbsp; the&nbsp; first&nbsp; time.&nbsp; As&nbsp; a&nbsp; significant&nbsp; segment&nbsp; of&nbsp; the&nbsp; wastewater&nbsp; treatment&nbsp; technique&nbsp; during&nbsp; the&nbsp; degradation&nbsp; of&nbsp; persistent&nbsp; compounds,&nbsp; such&nbsp; as&nbsp; organic azo dye, solar photocatalysis was studied. Also, the potential of photolysis of hydrogen peroxide for&nbsp; decolorization of the synthetic dye solution was determined. Aim of the first phase of the study was synthesizing&nbsp; materials&nbsp; by&nbsp; using&nbsp; different&nbsp; methods&nbsp; of&nbsp; preparation,&nbsp; and&nbsp; construction&nbsp; of&nbsp; a&nbsp; solar&nbsp; 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&nbsp; photocatalytic&nbsp; process&nbsp; by&nbsp; applying&nbsp; Fenton&nbsp; and&nbsp; photo-Fonton&nbsp; processes,&nbsp; as&nbsp; well&nbsp; as&nbsp; the&nbsp; determination&nbsp; of&nbsp; achieved efficiency&nbsp; of&nbsp; the&nbsp; appliedprocesses.&nbsp; Also, the degree&nbsp; of mineralization and the identification of degradation products after applied processes were determined. Application&nbsp; of the photo-Fenton process on a real effluent was conducted as well. Based on the obtained results&nbsp; during&nbsp; Fenton&nbsp; process&nbsp; and&nbsp; using&nbsp; both&nbsp; types&nbsp; of&nbsp; catalysts&nbsp; in&nbsp; periods&nbsp; of&nbsp; low&nbsp; and&nbsp; high&nbsp; intensity&nbsp; of&nbsp; radiation, from the aspect of achieving high efficiency of decolorization and smallest iron leaching,&nbsp; it&nbsp; can&nbsp; be&nbsp; concluded&nbsp; that&nbsp; the&nbsp; Fenton&nbsp; process&nbsp; is&nbsp; most effective&nbsp; at&nbsp; pH&nbsp; 3.&nbsp; AlFeB&nbsp; showed&nbsp; greater&nbsp; reactivity even at less used doses of 0.05&nbsp; g, compared to CuOFeB (0.2 g), and the possibility of using&nbsp; less&nbsp; hydrogen&nbsp; peroxide&nbsp; (2.5&nbsp; mM),&nbsp; achieving&nbsp; high&nbsp; efficiency&nbsp; and&nbsp; a&nbsp; high&nbsp; degree&nbsp; 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&nbsp; a photolysis of hydrogen peroxide&nbsp; (80%).&nbsp; Contrary&nbsp; to&nbsp; these&nbsp; results,&nbsp; under&nbsp; the&nbsp; same&nbsp; reaction&nbsp; conditions,&nbsp; a&nbsp; higher&nbsp; doses&nbsp; of AlFeB catalyst (0.1 g) is needed at lower pH value&nbsp; 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&nbsp; radiation as a renewable and alternative source of photons, the above results should&nbsp; be taken into account in the cost-effectiveness&nbsp; analysis&nbsp; of&nbsp; the&nbsp; applied&nbsp; process. Also,&nbsp; the&nbsp; application&nbsp; of&nbsp; advanced&nbsp; oxidation processes is considered as a proposal&nbsp; for the best available technique when it comes to the treatment of&nbsp; wastewater&nbsp; from&nbsp; the&nbsp; textile&nbsp; industry,&nbsp; while&nbsp; as&nbsp; additional&nbsp; new&nbsp; techniques,&nbsp; photooxidation&nbsp; is considered as a candidate and the possibility of their application in the treatment of wastewater in tertiary treatment on semi-industrial systems.</p>

Identiferoai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)110666
Date13 August 2019
CreatorsPucar Milidrag Gordana
ContributorsBečelić-Tomin Milena, Dalmacija Božo, Maletić Snežana, Prica Miljana, Kerkez Djurdja
PublisherUniverzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad
Source SetsUniversity of Novi Sad
LanguageSerbian
Detected LanguageUnknown
TypePhD thesis

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