Okolišni aspekti reaktivacije TiO2-SnS2 i njegova primjena u obradi voda

master's thesis

• Title (english): Environmental aspects of TiO2-SnS2 reactivation and its reuse in water treatment
• Author: Anja Pintar
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Šime Ukić (član povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences; Environmental Engineering

Abstract

Okolišno prihvatljiva rješenja za upravljanje otpadnim vodama, uključujući poboljšanje kvalitete vode i recikliranje vode smatraju se ključnim prioritetnim područjima na globalnoj razini. Izazovi s kojima se susreću vodni resursi uzrokovano je zbog prisutnosti organskih i anorganskih onečišćujućih tvari otpuštenih iz brojnih antropogenih aktivnosti. Ova situacija je dodatno komplicirana nastalim nepristupačnim onečišćujućim tvarima kao što su farmaceutici koji imaju nisku biorazgradivost i otpornost na kemijsku i biološku obradu. Aktualna Direktiva 2013/39/EU uključila je farmaceutski spoj diklofenak (DCF) na tzv. „watch“ listu. Stoga se nameće potreba za istraživanjem učinkovitih ali i ekološki prihvatljivih metoda obrade u svrhu uklanjanja farmaceutika i ostalih prioritetnih tvari iz voda pri čemu napredni oksidacijski procesi točnije fotokatalitički procesi pokazuju veliki potencijal. U ovom radu provedena je imobilizacija TiO2-SnS2 fotokatalizatora na stakleni nosač koji je korišten za razgradnju diklofenaka u vodenom mediju procesom solar/TiO2-SnS2/H2O2. Ispitivana je učinkovitost reaktivacije toplinskom i kemijskom metodom (ozonacijom). Aktivnost imobiliziranog fotokatalizatora testirana je ponovnim fotokatalitičkim ciklusima. Ispitan je utjecaj parametara procesa (temperatura i vrijeme) na aktivnost fotokatalizatora. Najveća učinkovitost uklanjanja DCF-a i TOC-a kod toplinske reaktivacije ostvarena je pri srednjim eksperimentalnim uvjetima, odnosno pri 275 °C i u trajanju od 3 h, dok se ostvarena konverzija DCF-a nakon reaktivacije prema FFD planu kreće od 83,9 % do 88,7 %,a ostvarena mineralizacija od 77,8 % do 83,4 %. Kod kemijske reaktivacije najveća konverzija DCF-a i mineralizacija u ponovljenom ciklusu ostvarena je pri najblažim uvjetima kemijske reaktivacije, odnosno pri protoku O3 od 0,1 mM min^-1 u trajanju od 10 minuta.

Abstract (english)

Environmentally sustainable technologies for wastewater treatment including the improvement of water quality and water recycling are considered key priority. The challenges facing water resources are unprecedented due to the presence of organic and inorganic pollutants originated from numerous anthropogenic activities. This situation has been further complicated by emerging persistent contaminants such as pharmaceuticals which possess low biodegradability and resistance to chemical and biological treatments. Current Directive 2013/39/EC included the pharmaceutical diclofenac (DCF) in the watch list. Accordingly the efficient and environmental friendly methods for removal of pharmaceuticals and other priority pollutant from water are investigated, whereas Advanced Oxidation Process (AOPs), especially photocatalysis are found to be highly promising. In this research TiO2-SnS2 photocatalyst was immobilized on glass plates which were used for diclofenac degradation in water applying solar/TiO2-SnS2 process with hydrogen peroxide. Efficiency of the thermal and chemical reactivation by ozonation of photocatalyst was investigated. Activity of reactivated photocatalyst was tested by reuse for the diclofenac removal. The influence of process parameters (temperature and time) on photocatalyst activity was investigated. The highest efficiency of removal of DCF and TOC for heat reactivation was achieved at medium experimental conditions, at 275 °C for 3 h, while DCF conversion after reactivation to FFD plan ranged from 83.9 % to 88.7 %, and achieved mineralization from 77.8 % to 83.4 %. In chemical reactivation process parameters were concentration of ozone O3 and time and the highest conversion of DCF and mineralization were achieved under the lowest conditions of chemical reactivation, at O3 flow of 0.1 mM min^-1 for 10 minutes.

• Keywords: otpadna voda; diklofenak; TiO2-SnS2; solarna fotokataliza; okolišni aspekti
• Keywords (english): wastewater; diclofenac; TiO2-SnS2; solar photocatalysis; environmental aspects
• Language: croatian
• URN:NBN: urn:nbn:hr:149:257048
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-04-30 10:07:51