Razvoj mikroelektrode modificirane TiO2 nanočesticama

undergraduate thesis

• Title (english): Developement of microelectrode modified by TiO2 nanoparticles
• Author: Ivana Zrinski
• Mentor: Sanja Martinez (mentor)
• Committee member: Sanja Martinez (predsjednik povjerenstva)
• Committee member: Suzana Sopčić (član povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences; Materials

Abstract

U ovom radu ispitan je elektrokatalitički utjecaj TiO2 nanočestica na oksidaciju mokraćne kiseline na mikroelektrodi od grafitne paste. Mjerenje je provedeno na elektrodi bez nanočestica i sa masenim udjelom od 10 % nanočestica TiO2. Na obje elektrode, ispitan je utjecaj koncentracije mokraćne kiseline kao vodotopivog antioksidativnog standarda i brzine polarizacije, na voltametrijski odziv sustava. Dobiveni rezultati pokazuju da nanočestice imaju značajan elektrokatalitički efekt koji se očituje u pojavi strujnih valova pri niskim potencijalima, u području 190 do 450 mV i u pojavi kvazireverziblnosti. Efekt je vidljiv u 200 μM otopini mokraćne kiseline pri svim brzinama polarizacije. Rezultati ukazuju na mogućnost daljnjeg ispitivanje mikroelektrode od grafitne paste s nanočesticama kao senzora za određivanje antioksidativnih tvari u raznim medijima in situ.

Abstract (english)

In this study, the electrocatalytic influence of TiO2 nanoparticles on uric acid oxidation on graphite microelectrode has been studied. The measurement was performed at a nanoparticle-free electrode and at an electrode with 10% TiO2 nanoparticle content. On both electrodes, the influence of uric acid concentration as a water-soluble antioxidant standard and the influence of polarization rate on voltammetric response of the system has been studied. The results obtained show that nanoparticles have a significant electrocatalytic effect that is reflected in the occurrence of low potential current waves in the range of 190 to 450 mV and in the appearance of quasireversibility. The effect is visible in a 200 μM uric acid solution at all polarization rates. The results indicate the possibility of further testing of TiO2 nanoparticle -graphite paste microelectrodes as sensors for the determination of antioxidant substances in various media in situ.

• Keywords: antioksidans; mikroelektroda; grafitne paste; ciklička voltametrija; TiO2 nanočestice
• Keywords (english): antioxidant; microelectrode; carbon paste; cyclic voltammetry; TiO2 nanoparticles
• Language: croatian
• URN:NBN: urn:nbn:hr:149:231488
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and 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: 2021-01-08 11:40:13