Thermodynamics of the dissolution of amorphous and polymorphic TiO2 modifications in acid and alkaline media

Resumo

The effect the pH of an aqueous medium has on the molar solubility of polymorphic TiO₂ modifications at 25°C is calculated and experimentally tested thermodynamically with allowance for the formation of hydroxo complexes. It is found that molecular–ionic solubility depends substantially on TiO₂ structure and dispersity, increasing by three orders of magnitude upon moving from a stable crystalline to an amorphous modification.