Adsorpcija farmaceutskih mikroonečišćivala na TiO2-GO/rGO nanokompozitni fotokatalizator

undergraduate thesis

• Title (english): Adsorption of pharmaceuticals on TiO2-GO/rGO nanocomposite photocatalyst
• Author: Dorian Delić
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Committee member: Matija Cvetnić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Voda je neophodan resurs za sve aspekte života. Međutim, njene količine su ograničene te je onečišćenje voda problem s kojim se svakodnevno susrećemo. U posljednje vrijeme sve se više pažnje pridaje farmaceutskim mikroonečišćivalima. Farmaceutici su kemikalije koje se koriste zbog svoje biološke aktivnosti, odnosno za poboljšanje zdravlja. Posljedice farmaceutika koji su dospjeli u okoliš se već očituju kod nižih kralježnjaka, dok kod ljudi još nema poznatih utjecaja. Konvencionalni načini pročišćavanja voda ne uklanjaju farmaceutike, zato je potrebno istraživanje novih metoda koje će biti učinkovitije. Jedna od tih metoda je fotokataliza. Fotokataliza se može protumačiti kao promjena brzine reakcije zbog djelovanja svjetlosti na fotokatalizator koji na sebe ima adsorbirane nečistoće. Upravo su adsorbirane nečistoće, odnosno proces adsorpcije temelj ovog istraživanja. Cilj rada bio je određivanje adsorpcije farmaceutika diklofenaka i karbamazepina na TiO2-rGO nanokompozitni fotokatalizator. Titanijev dioksid je najčešće korišten fotokatalizator jer ne utječe na okoliš, kemijski je stabilan, katalitički je aktivan te je jeftin. Međutim, problem je široka zabranjena zona koja dopušta samo UV zračenju, koje čini manje od 5 % Sunčeva zračenja, pobuđivanje elektrona potrebnih za fotokatalizu. Upravo zbog tog razloga se uparuje s drugim poluvodičem, grafen oksidom. Redukcijom GO u reducirani grafen oksid može se upravljati širinom zabranjene zone. U radu je praćena adsorpcija karbamazepina i diklofenaka pri uvjetima pH 4, 6 i 8, a istražen je i utjecaj udjela rGO u TiO2-rGO. Utvrđena je minimalna adsorpcija karbamazepina te visoka adsorpcija diklofenaka pri pH 4.

Abstract (english)

Water is an indispensable resource for all aspects of life. However, its quantities are limited and water pollution is a problem we face on a daily basis. Recently, more and more attention has been given to pharmaceutical micropollutants. Pharmaceuticals are chemicals that are used because of their biological activities, that is, to improve health. The aftermath of pharmaceuticals that have already entered the environment is apparent in lower vertebrates, while there are no known effects on human health. Conventional methods for water purification do not eliminate pharmaceuticals, so it is necessary to explore new methods that will be useful. One of these methods is photocatalysis. Photocatalysis can be interpreted as a change in the rate of reaction due to the action of light on a photocatalyst which has adsorbed impurities. It is the adsorbed impurities, that is, the adsorption process, which is the foundation of this final paper. This work aims to determine the adsorption of diclofenac and carbamazepine pharmaceuticals on TiO2-rGO nanocomposite photocatalyst. Titanium dioxide is usually used as a photocatalyst because it does not affect the environment, it is chemically stable, catalytically active and it is inexpensive. However, the problem is a wide bandgap that only allows UV radiation, which accounts for less than 5 % of solar radiation, to activate electrons needed for photocatalysis. This is why it is paired with another semiconductor, graphene oxide. By reducing GO to reduced graphene oxide, the bandgap can be controlled. The adsorption of carbamazepine and diclofenac at pH 4, 6 and 8 was monitored and the effect of rGO content in TiO2-rGO was investigated. The minimum adsorption of carbamazepine and the high adsorption of diclofenac at pH 4 were determined.

• Keywords: adsorpcija; farmaceutska mikroonečišćivala; grafen oksid; reducirani grafen oksid; titanijev dioksid
• Keywords (english): adsorption; pharmaceutical micropollutants; graphene oxide; reduced graphene oxide; titanium dioxide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:306618
• 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: 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: Closed access
• Created on: 2023-02-14 10:04:32