Utjecaj termičke regeneracije fotokatalizatora na razgradnju diklofenaka u vodi TiO2/FeZSM5 procesom uz simulirano sunčevo zračenje

undergraduate thesis

• Title (english): Influence of thermal regeneration of TiO2/FeZSM5 on effectiveness of photocatalytic degradation of diclofenac in water under simulated solar irradiation
• Author: Matea Markus Marinić
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Šime Ukić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences; Environmental Engineering

Abstract

Povećanjem broja stanovnika razvija se industrija, što uzrokuje nastajanje sve veće količine otpada koji može narušiti biološku ravnotežu ekosustava. Poseban problem predstavljaju industrijske otpadne vode zbog toga što sadrže teške metale i teško razgradive toksične organske spojeve uključujući i farmaceutike. Farmaceutici su dizajnirani s ciljem specifičnog djelovanja u biološkim ekosustavima te ukoliko dospiju u okoliš, predstavljaju problem zbog mogućeg štetnog djelovanja. Glavna prednost farmaceutskih otpadnih voda je poznati sastav, zbog kojeg je omogućena ciljana obrada takve vode te uklanjanje njezinih karakterističnih onečišćivala. Kao najbolje metode pokazale su kemijske metode u koje se ubrajaju napredni oksidacijski procesi (engl. Advanced Oxidation Processes, AOP). Ti procesi se ubrajaju grupu niskootpadnih ili bezotpadnih tehnologija obrade otpadnih voda pa se njihovom primjenom smanjuje potreba za sekundarnom obradom. U napredne oksidacijske procese ubraja se fotokataliza. U ovom radu ispitivan je utjecaj termičke reaktivacije TiO2–FeZ fotokatalizatora na razgradnju diklofenaka u vodenom mediju pod simuliranim sunčevim zračenjem. Diklofenak se uklanjao u dva ciklusa: prije i nakon termičke reaktivacije te su uspoređivani rezultati oba ciklusa. U eksperimentima provedenim s fotokatalizatorom termički reaktiviranim na 300 ºC, uklanjanje DCF–a nakon fotokatalitičkog postupka veće je od onog dobivenog korištenjem fotokatalizatora prije reaktivacije, bez obzira na trajanje termičke reaktivacije. Može se pretpostaviti da se termičkom obradom pri 300 ºC poboljšala aktivnost tankih slojeva TiO2– FeZ povećavajući kristalnost amorfnog TiO2 kao vezivne komponente. Potom su utvrđene vrijednosti parametara termičke reaktivacije kojima se dobiva najveća aktivnost TiO2–FeZ u ciklusu ponovnog korištenja. U tu svrhu su provedeni eksperimenti reaktivacije pri različitim uvjetima odnosno pri različitim temperaturama i u različitom trajanju. Izračunom je dobiveno da su T=280 ºC i t=220 min optimalne vrijednosti za uklanjanje najviše diklofenaka u drugom ciklusu.

Abstract (english)

Growing population and industry development increase production of waste that can disrupt the biological balance of the ecosystem. A special problem is industrial wastewater because it contains heavy metals and hardly degradable toxic organic compounds, including pharmaceuticals. Pharmaceuticals are designed to have a specific activity in biological ecosystems and if they get into the environment, they represent an issue due to their possible harmful effects. The main advantage of pharmaceutical wastewater is its known composition, which provides targeted treatment of such water and removal of its characteristic pollutants. The best methods for pharmaceutical removal are chemical methods which include advanced oxidation processes, AOP. These processes are among a group of low-waste and wasteless technologies for wastewater treatment. Their use reduces the need for secondary treatment. Photocatalysis is one of the advanced oxidation processes. In this paper, the influence of thermal reactivation of TiO2–FeZ photocatalyst on the degradation of diclofenac in aqueous media, under simulated solar radiation, was studied. Diclofenac removal was conducted in two cycles: using fresh immobilized TiO2–FeZ and thermally reactivated. The results of both cycles were compared. In experiments performed with a photocatalyst thermally reactivated at 300 °C, DCF removal after photocatalytic process was higher in comparison to fresh photocatalyst, regardless of the duration of thermal reactivation. It can be assumed that thermal treatment at 300 ºC improved the activity of TiO2–FeZ thin films by enhancing the crystallinity of amorphous TiO2 as a binder component. Further, values of thermal reactivation parameters which provide the largest activity of TiO2– FeZ in reuse cycle were determined. For this purpose, experiments of reactivation were conducted under different conditions (at different temperature and for different duration). The calculation yielded T=280 ºC and t=220 min as optimal DCF removal conditions in reuse cycle.

• Keywords: obrada voda; fotokataliza; termička reaktivacija fotokatalizatora
• Keywords (english): water treatment; photocatalysis; thermal reactivation of photocatalyst
• Language: croatian
• URN:NBN: urn:nbn:hr:149:934043
• Study programme: Title: Environmental Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-02-06 08:26:56