Fotokatalitičko uklanjanje antibiotika iz vodenog medija

master's thesis

• Title (english): Photocatalytic removal of antibiotics from aqueous media
• Author: Katarina Kljajić
• Mentor: Marin Kovačić (mentor)
• Committee member: Marin Kovačić (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Ana Vrsalović Presečki (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Među farmaceutike čija prisutnost izaziva zabrinutost u okolišu ubraja se oksitetraciklin (OTC), antibiotik širokog spektra djelovanja. Jedan od razloga za zabrinutost uslijed prisutnosti antibiotika u okolišu općenito, je razvoj rezistentnih sojeva patogenih bakterija. Napredne oksidacijske tehnologije, a osobito fotokatalitički procesi, su perspektivno rješenje za uklanjanje farmaceutskih onečišćivala iz otpadnih voda. Međutim, još nije riješen problem iskorištenja energije vidljivog dijela elektromagnetskog spektra. Fotokatalitički aktivni poluvodiči, posebice TiO2, aktiviraju se ultraljubičastim zračenjem. U ovome radu ispitana je učinkovitost dušikom dopiranog titanijeva dioksida (N-TiO2), manje širine zabranjene zone u odnosu na referentni komercijalni Aeroxide P25 (TiO2-P25), za fotokatalitičku razgradnju oksitetraciklina u vodi. Ispitivanja su provedena pod simuliranim Sunčevim zračenjem s udjelom UV zračenja analognom u prirodi te pod isključivo vidljivim zračenjem, sa UV filtrom. Nadalje, ispitana je razgradnja OTC-a u prisutnosti hvatača radikala. Provedena su ispitivanja adsorpcijskih izotermi za adsorpciju OTC-a na TiO2. Slaganje s Langmuirovom izotermom ukazuje na homogenost površine TiO2-P25, dok slaganje s Freundlichovom izotermom ukazuje na heterogenost površine N-TiO2. Veću fotokatalitičku učinkovitost pokazuje TiO2-P25 kada nije korišten UV filtar, dok N-TiO2 pokazuje veće uklanjanje pod vidljivim zračenjem za različite vrijednosti pH. Hvatači radikala, fosfatni ion i dimetil sulfoksid povećavaju uklanjanje OTC-a pri pH 8.

Abstract (english)

Oxytetracycline (OTC), a wide spectrum antibiotic, is one of the pharmaceuticals which cause concern in the environment. One of the causes for concern is the appearance of antibiotic-resistant bacteria. Advanced oxidation processes, especially photocatalytic processes are a perspective solution for the removal of pharmaceuticals from waste waters. However, the utilization of visible irradiation is still lacking and many photocatalytically active semiconductors harvest only the ultraviolet part of the spectrum. In this work the photocatalytic effectiveness of nitrogen doped titania (N-TiO2), with a lower band gap than the reference photocatalyst Aeroxide P25 (TiO2-P25) was investigated for the degradation of OTC in water. The experiments were performed under simulated solar radiation with proportion of UV radiation analogous in nature and under visible radiation with UV filter. Moreover, the degradation of OTC was examined with scavengers. The adsorption isotherms for adsorption OTC with TiO2 were also investigated. Langmuir isotherm indicates the homogeneity of TiO2-P25 surface, while the Freundlich isotherm indicates the heterogenous surface of N-TiO2. Higher photocatalytic efficiency is shown by TiO2-P25 when UV filter is not used, while N-TiO2 shows higher removal when UV filter is used for the different pH values. Scavengers like phosphate ion and dimethyl sulfoxide increase the removal of OTC at pH 8.

• Keywords: fotokataliza; višekomponentni fotokatalizator; titanijev dioksid; željezov oksid
• Keywords (english): photocatalysis; multicomponent photocatalyst; titanium dioxide; iron oxide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:111294
• Project: Number: IP-2018-01-1982; Title: Nano-katalizatori aktivirani Sunčevim zračenjem u tehnologijama zaštite okoliša; Title: Nano-sized solar-active catalysts for environmental technologies; Acronym: NaSCEnT; Leader: Hrvoje Kušić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2022-03-05 09:41:07