Naslov
Mechanism of Charging of the Pyrite/Aqueous Interface as Deduced from Surface Potential Measurements

Autori
Preočanin, Tajana ; Tuksar, Mihaela ; Kallay, Nikola

Izvornik
Applied surface science (0169-4332) 253 (2007), 13; 5797-5801

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
pyrite ; surface charge ; surface potential ; adsorption

Sažetak
Surface potential of pyrite in an aqueous environment was measured by means of a single crystal pyrite electrode. The effect of the activity of S2 and Fe2+ ions as well as of pH, was examined. The results show that S2 and Fe2+ ions are the dominant potential determining ions. These ions are bound to surface sites with the extent depending on their activity in the bulk of the solution. Adsorption affinity of S2 ions is significantly higher than that of the Fe2+ ions so that in most cases the pyrite surface is negatively charged. The results were explained on the basis of the Surface Complexation Model. It was found that surface potential depends also on pH.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Rad je prezentiran na skupu Sixth International
Symposium on Effects of surface heterogeneity in
adsorption and catalysis on solids (ISSHAC-VI).
održanom od 28.08.–02.09.2006., Zakopane, Poljska
; Wladyslaw Rudzinski i Malgorzata Witko (ur.).

POVEZANOST RADA