Utjecaj kemijske regeneracije TiO2/FeZSM5 na učinkovitost fotokatalitičke razgradnje diklofenaka u vodi pod simuliranim sunčevim zračenjem

undergraduate thesis

• Title (english): Influence of chemical regeneration of TiO2/FeZSM5 on effectiveness of photocatalytic degradation of diclofenac in water under simulated solar irradiation
• Author: Dominik Kosir
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Vanja Kosar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Environmental Protection in Chemical Engineering

Abstract

Porast broja stanovnika, razvoj industrije, te cjelokupni tehnološki napredak ostavili su jak
utjecaj na okoliš. Broj onečišćujućih tvari koji se svakodnevno ispuštaju u okoliš, između
ostalog i farmaceutika, raste sve više i više, te je potrebno pronaći metode kojima se te tvari iz
okoliša mogu i ukloniti. Napredni oksidacijski procesi su se pokazali kao dobra metoda za
uklanjanje farmaceutika iz okoliša, a karakterizira ih nastajanje jako reaktivnih i neselektivnih
hidroksilnih radikala. Ti procesi djeluju brzo, te nakon razgradnje ostaje jako malo
sekundarnog otpada. Među farmaceutike spada i diklofenak. Utjecaj diklofenaka na okoliš, te
optimalne i ekonomski učinkovite načine njegove razgradnje potrebno je još detaljnije
istražiti.
U ovom radu ispitivao se utjecaj kemijske regeneracije TiO2-FeZ fotokatalizatora na
razgradnju diklofenaka u vodenom mediju pod simuliranim sunčevim zračenjem. TiO2 je
supstanca koja inače adsorbira u UV dijelu spektra. Budući da je 4-5% sunčevog zračenja od
300-400 nm, eksperiment je bilo moguće provesti i pod utjecajem sunčevog zračenja.
Fotokatalizator se kemijski regenerirao ozonom. Diklofenak se uklanjao u 2 ciklusa, s tim da
je u II ciklusu fotokatalizator bio kemijski regeneriran. Na kraju eksperimenta uspoređivani su
rezultati I i II ciklusa, te je ustanovljeno da je nakon regeneracije fotokatalizator pokazivao
nešto manju aktivnost nego prije regeneracije. Također je bilo bitno ustanoviti optimalne
parametre pri kojima će regenerirani fotokatalizator davati najbolje rezultate. U tu svrhu
provedeni su procesi regeneracije pri različitim uvjetima za različite pločice fotokatalizatora.
Ustanovljeno je da koncentracija ozona znatno utječe na aktivnost fotokatalizatora, dok samo
vrijeme ozonacije nema značajnog utjecaja. Također je ustanovljeno da je u II ciklusu najviše
diklofenaka uklonjeno pri najvećoj koncentraciji ozona, i najduljem vremenu izlaganja.

Abstract (english)

Population growth, development of industry, and overall technological progress have a strong
influence on the environment. The number of pollutants, including pharmaceuticals, being
released into the environment every day keeps growing, and for that reason, it is necessary to
find appropriate methods for the removal of these pollutants from the environment. Advanced
oxidation processes have been proven to be an excellent method for removal of
pharmaceuticals from the environment. They are characterized with the fast reactions with the
present organics, and they produce none or very small amounts of residual waste. They are
characterized by the formation of very reactive and non-selective hydroxyl radicals.
Diclofenac is one of the most widely available non-steroidal anti-inflammatory drugs. It's
influence on the environment, and economically efficient ways of decomposing it need to be
further investigated.
In this work, the influence of chemical regeneration of TiO2-FeZ photocatalyst on the
decomposition of diclofenac under simulated solar irradiation was examined. Diclofenac was
removed in 2 cycles. In the second cycle, chemically regenerated photocatalyst by ozone was
used. Based on the results, it was concluded that after the regeneration, the photocatalyst had
shown lesser activity than before the regeneration. It was also important to establish the
optimal values of regeneration parameters. In order to determine those parameters, different
photocatalyst plates were treated with different concentrations of ozone, and they were
exposed to ozone for different treatment periods. It was established that the concentration of
ozone had a significant effect on the activity of the photocatalyst. However, the duration of
the exposure didn't have a large effect on the results. It was also established that during the
second cycle, the greatest amount of diclofenac was removed by applying the highest
concentration of ozone, and highest duration of the exposure.

• Keywords: obrada voda; fotokataliza; regeneracija fotokatalizatora; ponovna upotreba
• Keywords (english): water treatment; photocatalysis; photocatalyst regeneration; reuse
• Language: croatian
• URN:NBN: urn:nbn:hr:149:506909
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-11-28 10:39:08