Starenje fotokatalizatora na temelju titan (IV) oksida i grafen oksida

master's thesis

• Title (english): Aging of photocatalysis based on titanium (IV) oxide and graphene oxide
• Author: Sara Pršić
• Mentor: Ivan Brnardić (mentor)
• Mentor: Igor Jajčinović (pomoć pri izradi, neposredni voditelj)
• Committee member: Anita Štrkalj (predsjednik povjerenstva)
• Committee member: Ivan Brnardić (član povjerenstva)
• Committee member: Vesna Ocelić Bulatović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2021-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

Zbog sve većeg porasta broja stanovništva i potrebe za industrijalizacijom radi što lagodnijeg života prouzrokovano konzumerizmom, razna industrijska postrojenja i tvrtke otpad ispuštaju u okoliš. Uporabom pesticida, farmaceutika, plastike, kao i ostalih onečišćujućih tvari koje nisu biorazgradive, narušavamo prirodni balans ujedno uništavajući okoliš u kojem živimo. Potrebno je pronaći što učinkovitiji način uklanjanja mikroonečišćivača. Jedni od modernijih načina uklanjanja mikroonečišćivača jesu napredni oksidacijski procesi, konkretno u ovom slučaju fotokataliza.
U ovom radu provedena je fotokataliza, kao metoda za uklanjanje salicilne kiseline iz vode. Fotokataliza je proces u kojemu pomoću UV zračenja i fotokatalizatora, nastaju hidroksilni radikali koji sudjeluju u razgradnji organskih mirkoonečišćujućih tvari. U svrhu poboljšanja fotokatalitičkih svojstava TiO2 dodan je grafen oksid. Radi usporedbe učinka grafen oksida na fotokatalitička svojstva, pripremljene su dvije vrste mrežica. Prva mrežica sadržava fotokatalizator TiO2, a druga TiO2 u kombinaciji sa grafen oksidom. Ispitivana su fotokatalitička svojstva prije starenja i nakon 6 mjeseci starenja u vodi i na zraku. Iz rezultata ispitivanja vidljivo je da se fotokatalizatori starenjem „troše“, odnosno smanjuje im se fotokatalitička sposobnost razgradnje salicilne kiseline u vodi. Iz dobivenih rezultata vidljivo je da je bolji fotokatalizator čisti TiO2.

Abstract (english)

Due to the growing population and the need for industrialization for more comfortable life caused by consumerism, various industrial plants and companies release waste into the environment. By using pesticides, pharmaceuticals, plastics, as well as other pollutants that are not biodegradable, we disturb the natural balance while destroying the environment we live. It is necessary to find the most effective way to remove micro-pollutants. One of the more modern ways of removing micro-pollutants are advanced oxidation processes, specifically in this case photocatalysis.
In this paper, photocatalysis was performed as a method for removing salicylic acid from water. Photocatalysis is a process in which, using UV radiation and photocatalysts, hydroxyl radicals are formed that participate in the decomposition of organic micro-pollutants. Graphene oxide was added to improve the photocatalytic properties of TiO2. To compare the effect of graphene oxide on photocatalytic properties, two types of glass fiber meshes were prepared. The first mesh contains the photocatalyst TiO2, and the second TiO2 in combination with graphene oxide. Photocatalytic properties before aging and after 6 months of aging in water and air were studied. The test results show that photocatalysts "wear out" with aging, ie their photocatalytic ability to decompose salicylic acid in water decreases. The obtained results show that the better photocatalyst is pure TiO2.

• Keywords: fotokataliza; TiO2; grafen oksid; sol-gel; onečišćavala
• Keywords (english): photocatalysis; TiO2; graphene oxide; sol-gel; pollutants
• Language: croatian
• URN:NBN: urn:nbn:hr:115:509549
• Study programme: Title: Graduate study program Metallurgy; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka metalurgije (magistar/magistra inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-10-06 08:00:47