Abstract
The adsorption mechanism of 1-vinyl-2-pyrrolidone (VP), poly(1-vinyl-2-pyrrolidone) (PVP), and azelaic acid was investigated on synthetic γ-aluminum oxide surfaces using FT-IR, FT-Raman, UV, and 13C NMR spectroscopy (solid state). It was found that VP adsorption from ethylene glycol (EG) solution, as well as PVP adsorption from both aqueous and EG solutions, was negligible. In the case of EG solutions, the solvent adsorbed at the γ-alumina surface. The presence of dicarboxylic acid enhances the adsorption of the PVP, due to a hydrophobic interaction between the carbon chains of the polymer and the dicarboxylic acid. The simultaneous adsorption of PVP and azelaic acid was studied as a function of time, pH, and solvent in order to establish a more detailed surface complexation model. Surface complexation of azelaic acid in aqueous solution starts with mainly outer sphere coordination, driven by electrostatic forces, which is transformed to an inner sphere complex in time, forming a covalent bond between the...
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