• Bajuk-Bogdanovic, Danica

Abstract

<jats:p>Organomodified bentonites were obtained by modification of bentonite clayfrom local mine Bogovina with four different alkylammonium ions in theamounts that correspond to cation exchange capacity. Carbonized bentonites,obtained by pyrolyzing the organomodified bentonites in the flow ofnitrogen, were characterized using the XRD, low-temperature N2physisorption, and Raman spectroscopy. Structural and textural properties ofcarbonized bentonites depended on the arrangement of alkylammonium cationsin the paternal organomodified bentonite, while the Raman spectroscopyconfirmed the presence of amorphous carbon. The obtained carbonizedbentonites were used for modification of the carbon paste electrode. Themodified electrodes were investigated using cyclic voltammetry andelectrochemical impedance spectroscopy. The electrosorption of chloride andsulfate anions on carbonized bentonites was studied by chronocoulometry. Theresults were interpreted in the terms of surface groups and texturalproperties of the carbonized bentonites.</jats:p>

Topics

• impedance spectroscopy
• surface
• amorphous
• Carbon
• x-ray diffraction
• Raman spectroscopy
• cyclic voltammetry