Abstract
The acid-base characteristics of troilite mineral are investigated at 25 °C and ionic strength between 0 and 0.1 M NaCl by potentiometric titration, solubility measurements and quantum chemical calculations. Constant capacitance model with one amphoteric surface site is used to interpret the potentiometric titration data. It is found that the point of zero charge (pHPZC) decreases with increasing the ionic strength. The model proposed for the description of this behavior indicates that pHPZC may vary with the ionic strength even if the structural charges equal zero. The quantum chemical calculations show that the stability of the studied surface species increases in the order of FeS < FeSH < FeSH2. It has also been found that the positive charge of surface-bound hydrogen atoms is very low (<+0.1). This small positive charge of hydrogen at troilite surface could explain the adsorption of cations at the mineral surface, even at low pH values.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.