Abstract
Isoelectric point (IEP) was measured on simple metal oxides (Co 3O 4, NiO, CuO, ZnO) as a function of treatment temperature and as a function of the composition of the binary metal oxide systems (CoOAl 2O 3, ZnOAl 2O 3, CoOFe 2O 3, NiOFe 2O 3, CuOFe 2O 3, ZnOFe 2O 3). Most experimental IEP values for simple metal oxides showed good agreement with those calculated by the Parks equation, but some of them were smaller than the calculated ones, because of surface oxidation of heated metal oxides in air. Binary metal oxides having inverse spinel structure revealed characteristically small values of IEP. This can be explained in terms of the presence of tetrahedrally coordinated trivalent metal ions (Fe 3+), which causes the polarization of surface hydroxyls to release H + ions easily from the surface.
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