Abstract
The most widely used method for the preparation of vanadium pentoxide sols involves addition of an acid to ammonium vanadate, washing the precipitated oxide until it begins to peptize and then suspending in water until dispersion is complete (1).2 The sols contain a variable amount of molecular vanadium pentoxide, depending on their age (5). The molecular fraction passes through dialyzing membranes and, since it is in equilibrium with the colloidal particles, purification of the system by dialysis is accompanied by continuous loss of vanadium. The preparation of a sol of low electrolyte content has been reported by Prandtl and Hess (4). The method consisted of hydrolyzing the tertiary butyl ester of orthovanadic acid followed by distillation of the alcohol. This report describes the preparation of a relatively pure vanadic acid system from ammonium vanadate by the method of ion exchange. A batch procedure has been employed because of the low solubility of the starting material.
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