Naslov
Electrochemical Behavior of L-cysteine on Mixed Silver-Copper Sulfides: Analytical Applicability via Tentative Reaction Mechanism

Autori
Vladislavić, Nives ; Buljac, Maša ; Škugor Rončević, Ivana ; Bralić, Marija ; Brinić, Slobodan ; Buzuk, Marijo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina / Korać, Fehim (ur.). - Sarajevo, 2016, 45-45

Skup
2nd International Congress of Chemists and Chemical Engineers of Bosnia and Herzegovina

Mjesto i datum
Sarajevo, Bosna i Hercegovina, 21.10.2016. - 23.10.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
electrochemical; silver-copper sulfides; cysteine; determination.

Sažetak
Electrochemical behavior of L-cysteine on three different materials, prepared by co-precipitation of the mixed metals ions (Cu 2+ , Ag + ) and S 2- at different mole ratio (1:0.5 ; 1:1 ; 1:1.8) has been investigated. X-ray diffractometry (XRD) of prepared materials showed that all three materials consisted of ternary sulfides while in two powders metallic silver was founded. Prepared materials exhibit different electrical resistance and solubility. The influence of pH (5, 7, 9) on the redox activity of L-cysteine functional groups, on the prepared materials, were investigated by cyclic voltammetry. Redox processes of functional groups (thiol and carboxylic) that take place on electrode surfaces, along with investigation of possible fouling effect, were monitored by electrochemical impedance spectroscopy. Significant influence of materials solubility, at various pH, on electrochemical behavior of L-cysteine were noticed. Tentative reaction mechanism for oxidation of thiol group at pH 5 and 7 was proposed for material consisted of jalpaite doped with Ag. Also, quasi-reversible process attributed to the redox activity of carboxylic group was noticed at all three prepared materials. The excellent electrocatalytic performances of L-cysteine on prepared materials are very promising for applicability of prepared electrodes in voltammetric or amperometric determination of cysteine.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA