Abstract
The phenomenon of ozone-induced particle destabilization was studied employing a colloidal suspension of 150 mg/L sodium montmorillonite (Na-M) suspended in river water containing 3.1 mg/L natural organic matter (NOM). The suspension was treated with high ( 106 pM) and low ( 10 pM) ozone doses. Extended DLVO theory was utilized to investigate the surface thermodynamics of unozor?ated and ozonated Na-M coated with NOM (cNa-M). Ozonation decreased the surface charge and the Lewis base parameter, and increased the Lewis acid parameter and Lifshitz-van der Waals component of the surface energy. The overall result of these changes was a decrease in the change in the total free energy of interaction and hence a decrease in the stability of cNa-M with increasing ozonation. Modification in the surface thermodynamics responsible for destabilization could possibly be attributed to partial dealuminization of Na-M and wociated NOM transformations, increasing the autophilicity of the colloids.
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