Ispitivanje fotokatalitičke aktivnosti cirkonijem dopiranog cerijeva(IV) oksida

undergraduate thesis

• Title (english): The study of photocatalytic activity of zirconium doped cerium(IV) oxide
• Author: Maja Dragić
• Mentor: Katarina Mužina (mentor)
• Committee member: Katarina Mužina (predsjednik povjerenstva)
• Committee member: Stanislav Kurajica (član povjerenstva)
• Committee member: Monika Šabić Runjavec (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cerijev(IV) oksid poznat je po vrlo dobroj katalitičkoj i fotokatalitičkoj aktivnosti u različitim reakcijskim sustavima, a posebice onima kojima je cilj uklanjanje štetnih tvari iz okoliša. Štetni utjecaj organskih boja na vodeni ekosustav i ljudsko zdravlje, dobro je poznat ekološki problem, a jedna od najučinkovitijih metoda za njihovo uklanjanje iz okoliša je heterogena fotokataliza. Stoga je u ovom radu ispitivana je fotokatalitička aktivnost uzoraka cerijeva (IV) oksida dopiranog s različitim količinama cirkonija (0, 10, 20 i 30 mol%) u procesu razgradnje metilenskog plavila (MB) i rodamina B (RhB), dvije često korištene industrijske boje koje su toksične u prekomjernim koncentracijama i imaju tendenciju akumulacije u okolišu. Uzorci su sintetizirani sintezom izgaranja, koja omogućuje brzu pripravu poroznih materijala uz nisku cijenu prekursora i manju potrošnju energije. Pripremljeni fotokatalizatori su karakterizirani pomoću rendgenske difrakcijske analize (XRD), Fourierove transformacijske infracrvene spektroskopije (FTIR), skenirajuće elektronske mikroskopije (SEM), energijski razlučujuće rendgenske spektroskopije (EDS) i UV-Vis difuzne refleksijske spektroskopije (UV-Vis DRS). Fotokatalitička aktivnost materijala testirana je u procesu razgradnje rodamina B (RhB) i metilenskog plavila (MB) (c₀ = 10 mg L⁻¹) pod UV-A svjetlom. Uzorak cerijeva oksida dopiran s 30 mol. % cirkonija pokazao je najvišu fotokatalitičku aktivnost u procesu fotokatalitičke razgradnje navedenih boja.

Abstract (english)

Cerium(IV) oxide is known for its very good catalytic and photocatalytic activity in various reaction systems, especially those whose goal is to remove harmful substances from the environment. The harmful impact of organic dyes on the aquatic ecosystem and human health is a well-known environmental problem, and one of the most effective methods for their removal from the environment is heterogeneous photocatalysis. Therefore, in this work, the photocatalytic activity of samples of cerium (IV) oxide doped with different amounts of zirconium (0, 10, 20 and 30 mol%) was investigated in the process of decomposition of methylene blue (MB) and Rhodamine B (RhB), two frequently used industrial colors that are toxic in excessive concentrations and tend to accumulate in the environment. The samples were synthesized by combustion synthesis, which enables rapid preparation of porous materials with low precursor cost and lower energy consumption. The prepared photocatalysts were characterized using X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS).
The photocatalytic activity of the prepared materials was tested in the process of degradation of Rhodamine B (RhB) and methylene blue (MB) (c₀ = 10 mg L⁻¹) under UV-A light. Cerium oxide sample doped with 30 mol. % of zirconium showed the highest photocatalytic activity in the process of photocatalytic decomposition of the aforementioned dyes.

• Keywords: fotokataliza; cerijev(IV) oksid; cirkonij; organska bojila
• Keywords (english): photocatalysis; cerium(IV) oxide; zirconium; organic dyes
• Language: croatian
• URN:NBN: urn:nbn:hr:149:181543
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-11-14 16:49:45