Primjena kompozitnih fotokatalizatora u fotokatalitičkoj redukciji supstituiranih aromata

undergraduate thesis

• Title (english): Application of composite photocatalysts for the reduction of substituted aromatics
• Author: Ivana Grbin
• Mentor: Marin Kovačić (mentor)
• Committee member: Marin Kovačić (predsjednik povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Fotokataliza je polje zelene kemije koja koristi svjetlost u razgradnji tvari te ne zagađuje okoliš. U smislu organske kemije, fotokatalitička redukcija podrazumijeva nastajanje jednostrukih kovalentih veza. Kompozitni fotokatalizatori su fotokatalizatori modificirani metalima, nemetalima i ionskim komponentama. Dodatak modifikacija utječe na fotokatalizator i primijećeno je da uz pomoć kompozitnih fotokatalizatora, reakcije redukcije u većini slučajeva mogu se odvijati uz prisutsvo Sunčeve svjetlosti. Konvencionalni pristupi redukciji zahtijevaju visoke temperature i tlakove te korištenje raznih otapala koja kasnije treba skladištiti. S obzirom na cilj zelene kemije da se ne koriste otapala, energetska potreba redukcijskih sredstava je izravno osigurana Sunčevom energijom. U ovom radu prikazani su različiti kompozitni fotokatalizatori koji sudjeluju u redukciji supstituiranih aromatskih spojeva (4-aminofenol, 4-nitrofenol, nitroanilin, benzaldehid), usporedba sa fotokatalizatorima bez modifikacija kao i fotokataliza bez upotrebe fotokatalizatora (fotoliza). Također, prikazana je sinteza kompozitnih fotokatalizatora, utjecaj veličine čestica na reakciju te utjecaj redukcijskih sredstava. Za svaki višekomponentni fotokatalizator izvedeno je nekoliko ciklusa ponovne upotrebe kako bi se utvrdila njihova stabilnost i mogućnost ponovnog korištenja u reakciji redukcije.

Abstract (english)

Photocatalysis is a field of green chemistry that uses light to decompose matter and does not pollute the environment. In terms of organic chemistry, photocatalytic reduction involves the formation of single covalent bonds. Composite photocatalysts are photocatalysts modified with metals, non-metals and ionic components. The addition of modifications affects the photocatalyst and it has been observed that with the help of composite photocatalysts, reduction reactions can in most cases take place in the presence of sunlight. Conventional approaches to reduction require high temperatures and pressures and the use of various solvents that need to be stored later. Given the goal of green chemistry not to use solvents, the energy need of reducing agents is directly provided by solar energy. This paper presents various composite photocatalysts involved in the reduction of substituted aromatic compounds (4-aminophenol, 4-nitrophenol, nitroaniline, benzaldehyde), comparison with photocatalysts without modifications as well as photocatalysis without the use of photocatalysts. Also, the synthesis of composite photocatalysts, the influence of particle size on the reaction and the influence of reducing agents are presented. Several recycling cycles were performed for each multicomponent photocatalyst to determine their reusability in the reduction reaction.

• Keywords: aromati; fotokataliza; višekomponentni fotokatalizator; redukcija
• Keywords (english): aromatics; photocatalysis; composite photocatalyst; reduction
• Language: croatian
• URN:NBN: urn:nbn:hr:149:944508
• 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: Access restricted to students and staff of home institution
• Created on: 2023-03-29 11:40:26