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undergraduate thesis
Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. urn:nbn:hr:159:443185
Rešetar, Egon
University of Zagreb
Faculty of Food Technology and Biotechnology
Department of Chemistry and Biochemistry
Laboratory for General and Inorganic Chemistry and Electroanalysis

Institutional repository: Repository of the Faculty of Food Technology and Biotechnology

Cite this document

Rešetar, E. (2017). Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:443185

Rešetar, Egon. "Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. https://urn.nsk.hr/urn:nbn:hr:159:443185

Rešetar, Egon. "Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. https://urn.nsk.hr/urn:nbn:hr:159:443185

Rešetar, E. (2017). 'Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda', Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 24 May 2024, https://urn.nsk.hr/urn:nbn:hr:159:443185

Rešetar E. Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2017 [cited 2024 May 24] Available at: https://urn.nsk.hr/urn:nbn:hr:159:443185

E. Rešetar, "Primjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda", Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:159:443185

Metadata
TitlePrimjena pirolitičkog ugljika dobivenog pirolizom otpadne mljevene kave kao materijala za izradu bioelektrokatalitičkih elektroda
Title (english)Application of the pyrolytic carbon derived from the spent coffee grounds as a material for fabrication of bioelectrocatalytic electrodes
AuthorEgon Rešetar
MentorDamir Iveković (mentor)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
(Department of Chemistry and Biochemistry)
(Laboratory for General and Inorganic Chemistry and Electroanalysis)
Zagreb
Defense date and country2017, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Biotechnology
Abstract
U radu je istražena primjena otpadne kave zaostale nakon pripreme espresso kave, kao sirovine za dobivanje pirolitičkog ugljika (PU) za primjenu u bioelektrokatalizi. PU su pripremljeni pirolizom u inertnoj atmosferi, pri T=800 °C, koristeći nemodificiranu otpadnu kavu te otpadnu kavu impregniranu željezovim(II) nitratom kao katalizatorom grafitizacije. Karakterizacija dobivenih PU provedena je elektronskom mikroskopijom i rendgenskom difrakcijom. Na dobivene PU imobilizirana je peroksidaza te su iskorišteni za pripravu bioelektrokatalitičkih elektroda, kojima su istražena svojstva pri redukciji H2O2 te je praćena promjena njihove aktivnosti tijekom skladištenja. Pokazano je da su uzorci dobiveni pirolizom nemodificirane otpadne kave građeni od amorfnog ugljika te da nisu prikladni za primjenu u bioelektrokatalizi zbog slabe bioelektrokatalitičke aktivnosti i kratke vremenske stabilnosti. Uzorci dobiveni pirolizom otpadne kave modificirane sa Fe(NO3)2 sadrže značajan udio grafitnih domena te pokazuju 2–3 puta veću bioelektrokatalitičku aktivnost i vremensku stabilnost, što je pripisano većoj aktivnoj površini PU dobivenih pirolizom u prisutnosti katalizatora.
Abstract (english)
In this work, the applicability of spent coffee grounds as a starting material for production of pyrolytic carbon (PC) for application in bioelectrocatalysis was investigated. PC samples were prepared by pyrolysis of non-modified spent coffee grounds and coffee grounds impregnated with iron(II) nitrate as graphitization catalyst at 850 °C, under inert atmosphere. Characterization of the obtained PC samples was conducted by electron microscopy and X-ray diffraction. The obtained PC samples were employed as a substrate for peroxidase immobilization and subsequently utilized for construction of bioelectrocatalitic electrodes. Bioelectrocatalytic activity and storage stability of obtained electrodes were monitored duting 7-days period. It was shown that PC samples produced from non-modified spent coffee grounds are composed predominately of amorphus carbon and are not well suited for bioelectrocatalisis due to their low bioelectrocatalitic activity and short storage stability. Samples obtained from iron(II) nitrate-impregnated coffee grounds exhibited a significant amount of graphite domains in their structure and showed 2,5–3 times greater bielectrocatalytic activity and storage stability, which can be atributed to their larger active surface area.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:159:443185
Study programmeTitle: Biotechnology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2017-10-13 12:00:01