Abstract
The adsorption of PAA on TiO 2 from aqueous solution has been studied at 25°C as a function of pH. It was found that polymer adsorption decreases with increasing pH up to pH 3, and can be described by a Langmuir-type isotherm. The mechanism of polymer bonding is discussed in terms of H-bonding and electrostatic interaction. The ionic charge on the polymer molecules was investigated by means of viscosity measurements, and the surface charge on TiO 2 by determining the point of zero charge (pzc). A tentative equation for optimum polymer concentration for flocculation is derived with reference to La Mer-Healy's flocculation theory.
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