Electrosurface and adsorption properties of nanodimensional chromium oxide

Abstract

Electrosurface and adsorption properties of chromium oxide(III) prepared by nitrate and reducing agent combustion under microwave irradiation is considered in this work. This method of synthesis provides the opportunity to obtain nanoparticles quickly. Electrosurface properties of the obtained chromium oxide(III) were studied. Point of zero charge for Cr2O3 in solutions of KCl with different concentration (10−1–10−3 mole/l) has been determined by the potentiometric titration method (pHzcp = 7.1). Following obtained data adsorption of H+ and OH− ions on the surface of oxide was calculated. No effect of electrolyte concentration on pHzcp was found. Dependence of specific electrical conductivity and pH on time has been studied. It was determined that the equilibrium in the system is established within first 2 hours after contact of the oxide and solution. Based on electrophoretic mobility data electrokinetic potential for chromium oxide(III) was calculated (pHIEP = 7.1).