Influence of 2,2′‐bipyridine on oxidative dissolution of iron monosulfide

Abstract

The 2,2′‐bipyridine effects on iron monosulfide (FeS) oxidative dissolution rates have been examined by potentiodynamic polarization and electrochemical impedance spectroscopy. The adsorption of 2,2′‐bipyridine to synthetic FeS was investigated by batch adsorption experiments, SEM, energy‐dispersive X‐ray analysis and Raman spectroscopy. The experiments were performed in air‐saturated solutions at pH 5, 25 °C and an ionic strength of I = 0.004 M NaCl. Correlation between oxidative dissolution rates and 2,2′‐bipyridine adsorption suggests that FeS oxidative dissolution is the result of two antagonistic processes: (i) the inhibiting adsorption of 2,2′‐bipyridine on mineral surface and (ii) the promoting effect of 2,2′‐bipyridine on the iron dissolution from FeS surface. Copyright © 2014 John Wiley & Sons, Ltd.

Troilite (FeS) Oxidation in the Presence of a Newly Synthesized TRIS-based Base

“…Ferrous iron ligands stabilizes Fe(II), which will slow its oxidation to Fe(III), but at the same time they can speed up the release of ferrous iron, generating the FeS destruction. Another way to control the rate of FeS oxidation is the use of organic inhibitors [2, [13][14][15]. Data from the literature shows that most of the organic inhibitors act by adsorption on the surface of the mineral sulfides.…”

“…), multiple bonds and aromatic cycles. The organic layer resulted by adsorption of the organic molecules acts as a barrier for the electron transfer to oxidant [2,14].…”

Troilite (FeS) Oxidation in the Presence of a Newly Synthesized TRIS-based Base

“…Ferrous iron ligands stabilizes Fe(II), which will slow its oxidation to Fe(III), but at the same time they can speed up the release of ferrous iron, generating the FeS destruction. Another way to control the rate of FeS oxidation is the use of organic inhibitors [2,[13][14][15]. Data from the literature shows that most of the organic inhibitors act by adsorption on the surface of the mineral sulfides.…”

“…), multiple bonds and aromatic cycles. The organic layer resulted by adsorption of the organic molecules acts as a barrier for the electron transfer to oxidant [2,14].…”