prikaz prve stranice dokumenta Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina
Embargo period 2025-09-01
undergraduate thesis
Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. urn:nbn:hr:149:028273
Lažeta, Tadea
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

Cite this document

Lažeta, T. (2024). Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:028273

Lažeta, Tadea. "Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:028273

Lažeta, Tadea. "Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:028273

Lažeta, T. (2024). 'Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina', Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:028273

Lažeta T. Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2024 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:149:028273

T. Lažeta, "Fotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina", Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:149:028273

Metadata
TitleFotoelektrokemijska karakterizacija poluvodiča u prisustvu perfluoriranih karboksilnih kiselina
Title (english)Photoelectrochemical characterisation of semiconductor in the presence of perfluorinated carboxyilic acid
AuthorTadea Lažeta
MentorMarijana Kraljić Roković (mentor)
Committee memberMarijana Kraljić Roković (predsjednik povjerenstva)
Committee memberJozefina Katić (član povjerenstva)
Committee memberIva Movre Šapić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2024-09-03, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Cilj ovog rada bio je ispitati fotoelektrokemijske odzive BiVO4 elektrode i elektrode željezom (30% Fe2O3) i srebrom (6% Ag) modificiranog BiVO4 u otopinama perfluorooktanske kiseline (PFOA) i Na2SO4. Ispitivanja su provedena za osvijetljene i neosvijetljene elektrode uz LED lampu kao izvor svjetla. Pri tome je korištena metoda linearne polarizacije, elektrokemijska impedancijska spektroskopija, kronoamperometrija i praćenje potencijala otvorenog kruga u vremenu. Rezultati dobiveni ispitivanjem metodom linearne polarizacije i kronoamperometrije u 0,5 M Na2SO4 pokazuju da su obje elektrode fotoaktivne, ali modificirana elektroda pokazuje bolju fotoaktivnost odnosno veće fotostruje. Ovom metodom je također ispitana modificirana elektroda u otopini 0,01 mg/ml PFOA u 0,5 M Na2SO4. Manje vrijednosti fotostruja te značajniji porast struje iznad 1,2 V u prisustvu PFOA ukazuje na različito ponašanje elektrode u prisustvu PFOA u odnosu na čisti Na2SO4. Ispitivanjem metodom elektrokemijske impedancijske spektroskopije utvrđeno je da su veće impedancije zabilježene bez prisustva svjetla što ukazuje na dobru fotoaktivnost materijala. Također je potvrđena bolja fotoaktivnost modificiranog BiVO4. Praćenjem napon otvorenog kruga potvrđena je fotoaktivnost za obje elektrode, a budući da napon poprima negativniju vrijednost može se zaključiti da su ispitani materijali n – tip poluvodiča. Ova metoda je također pokazala da ne postoji razlika u odzivu modificiranog BiVO4 u otopini Na2SO4 i otopini PFOA u Na2SO4. što je u suprotnosti s rezultatima linearne polarizacije.
Abstract (english)
The aim of this study was to investigate the photoelectrochemical responses of a BiVO₄ electrode and a BiVO₄ electrode modified with iron (30% Fe₂O₃) and silver (6% Ag) in solutions of perfluorooctanoic acid (PFOA) and Na₂SO₄. The experiments were conducted using both illuminated and non-illuminated electrodes, with an LED lamp as the light source. The methods employed included linear polarization, electrochemical impedance spectroscopy, chronoamperometry, and monitoring of open-circuit potential over time. Results obtained from linear polarization and chronoamperometry in 0.5 M Na₂SO₄ show that both electrodes exhibit photoactivity, with the modified electrode demonstrating enhanced photoactivity, as evidenced by higher photocurrents. Additionally, the modified electrode was tested in a solution of 0.01 mg/mL PFOA in 0.5 M Na₂SO₄, where the lower photocurrents and significant increase in current above 1.2 V in the presence of PFOA indicate different behavior of the electrode in the presence of PFOA compared to pure Na₂SO₄. Electrochemical impedance spectroscopy revealed higher impedances in the absence of light, indicating good photoactivity of the material, with the modified BiVO₄ showing superior photoactivity. Monitoring the open-circuit potential further confirmed the photoactivity of the electrodes, with the observed shift to more negative values suggesting that the tested materials are n-type semiconductors. However, this method also indicated different response of modified BiVO₄ in Na2SO4 and PFOA solutions, which contrasts with the results obtained from linear polarization.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:028273
ProjectNumber: IPS-2022-02-4780
Title: Fotokatalitička razgradnja perfluoriranih spojeva u vodi uz Sunčevo zračenje
Title: Solar-assisted photocatalytic degradation of perfluorinated compounds in water
Acronym: SoAPperF
Leader: Hrvoje Kušić
Jurisdiction: Croatia
Funder: Hrvatska zaklada za znanost
Funding stream: Slovenian-Croatian Bilateral Projects
Study programmeTitle: 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 resourceText
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2025-09-01
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Created on2024-10-14 10:09:48