Abstract
The poly(vinyl alcohol) (PVA) influence on the adsorption and electrokinetic properties of the mixed oxide Mn x O y –SiO2/polymer solution system was examined. Three oxides differing with the Mn x O y contents were applied (0.2; 1 and 3 mmol/g SiO2, respectively). The PVA with the molecular weight 100 kDa was characterized with the acetate groups content equal to 14 %. Adsorption, solid surface charge and zeta potential measurements were made as a function of solution pH (3–10). The obtained results showed that the PVA adsorption amount strongly depends on not only the solution pH, but also manganese oxide content on the mixed oxide surface. The higher solution pH value (or Mn x O y content) is, the higher polymer adsorption is obtained. The PVA addition to the solid suspension causes minimal changes of the mixed oxide surface charge density, whereas the zeta potential of solid particles increases significantly in the polymer presence.
Highlights
The application possibilities of metal oxides in various branches of industry and ecology are large
The obtained results showed that the poly(vinyl alcohol) (PVA) adsorption amount strongly depends on the solution pH, and manganese oxide content on the mixed oxide surface
In the present study the mechanism of poly(vinyl alcohol) (PVA) adsorption on the surface of MnxOy–SiO2 was investigated. This was done based on the results of measurements: spectrophotometric, potentiometric titration and electrokinetic
Summary
The application possibilities of metal oxides (including manganese oxides) in various branches of industry and ecology are large. MnxOy–SiO2 mixed oxides (varying in MnxOy content) obtained in such a way exhibit different surface characteristics and adsorption affinity for macromolecular compounds. They were characterized by very large surface area. Different structure and surface properties of mixed oxides in comparison to simple oxides can change nature of interactions between the macromolecules and the solid surface These substances can be used as effective adsorbents in many technological processes. In the present study the mechanism of poly(vinyl alcohol) (PVA) adsorption on the surface of MnxOy–SiO2 was investigated This was done based on the results of measurements: spectrophotometric (determination of the adsorbed amount of the polymer on the solid surface), potentiometric titration (determination of the surface charge density of mixed oxide in the absence and presence of the PVA) and electrokinetic (zeta potential determination of MnxOy–SiO2 particles covered and not with polymeric layers). Obtained polyvinyl acetate is converted to the PVA by the hydrolysis of its acetate groups to hydroxyl ones
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