Ekološki prihvatljiva metoda redukcije grafen-oksida

undergraduate thesis

• Title (english): A green method for graphene oxide reduction process
• Author: Ivana Peran
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Suzana Sopčić (član povjerenstva)
• Committee member: Elvira Vidović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Cilj ovog rada je bio provesti redukciju grafenova oksida (GO) u grafen (rGO) korištenjem ekstrata lista masline ( ELM ). Redukcija je provedena uz različite količine ELM pri čemu je kao produkt kod manjeg omjera ELM/GO dobiven uzorak rGO1, dok je uz veći omjer ELM/GO dobiven uzorak rGO2. Uzorci GO, rGO1 i rGO2 okarakterizirani su nizom metoda poput infracrvene spektroskopije potpomognute Fourierovom transformacijom (FT–IR), termogravimetrijskom analizom (TGA), te cikličkom voltametrijom. Pomoću TGA analize i FT - IR spektroskopije utvrđeno je da je proces redukcije proveden uspješno te da je dobiven produkt (rGO ) kod kojeg je, u odnosu na GO, značajno smanjen udio kisikovih funkcionalnih skupina. Metoda cikličke voltametrije je pokazala da dobiveni uzorak pokazuje dobra kapacitivna svojstva, što znači, osim što su uklonjene kisikove funkcionalne skupine, da je došlo do regeneracije sp2 hibridizacije kod ugljikovih atoma. Zabilježeni su specifični kapaciteti za rGO1 uzorak od 12-25 F g^-1 te za rGO2 uzorak od 117-227 F g^-1 koji ovise o granicama potencijala unutar kojih je provedeno ispitivanje. Dobiveni rezultati ukazuju da je korištenjem fenolnih spojeva iz ekstrakta lista masline moguće djelotvorno provesti redukciju GO, a dobiveni produkt (rGO) je moguće upotrijebiti kao aktivni materijal u elektrokemijskim izvorima energije.

Abstract (english)

The main goal of this research was to carry out the reduction of graphene oxide ( GO ) to graphene ( rGO ) by using olive leaf extract ( ELM ) . Reduction was carried out with different amounts of ELM. The sample obtained by using the smaller ratio ELM/GO was rGO1, while the sample obtained byusing higher ratio of ELM/GO was rGO2 . GO, rGO1 and rGO2 samples have been characterized by a number of methods such as Fourier transformed infrared spectroscopy ( FT - IR ) , thermogravimetric analysis ( TGA ) , and cyclic voltammetry. By TGA analysis and FT - IR spectroscopy it was found that the reduction process was successful and the obtained product ( rGO ) had significantly reduced amount of oxygen functional groups compared to the GO . Cyclic voltammetry method showed a good capacitive properties,of the obtained material indicating that in addition to removal of oxygen functional groups. the regeneration of sp2 hybridization also takes place during the reduction process. The specific capacitance values for rGO1 sample were 12-25 F g^-1 and for rGO 2 sample 117 to 227 F g^-1 which depends on potential range of investigation. The results obtained in this work indicate that by using phenolic compounds from olive leaf extract it is possible to reduce GO effectively. The obtained product, rGO, can be used as an active material in electrochemical power sources.

• Keywords: ciklička voltametrija; ekstrakt lista masline; FT-IR; grafen; grafenov oksid; TGA
• Keywords (english): cyclic voltammetry; olive leaf extract; FT-IR; graphene; graphene oxide; TGA
• Language: croatian
• URN:NBN: urn:nbn:hr:149:717054
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-01-30 13:17:26