Abstract
The effects of biopolymer type and solution pH on the adsorption mechanism on the nanozirconia surface were examined. Three natural polymers, bovine serum albumin (BSA), lysozyme (LSZ) and bacterial polysaccharide (EPS), were applied. The adsorption, surface charge, zeta potential and stability measurements were carried out in the pH range 3–10. The largest adsorption was found for EPS at pH 3 and the lowest for BSA at pH 3. Both EPS and BSA (of low internal stability) binding with the solid surface proceeds due to both electrostatic forces and hydrogen bridges formation. LSZ at pH 3 does not adsorb on the zirconia surface (electrostatic repulsion prevents binding of high internal stability protein). Lysozyme has the greatest influence on the zirconia suspension stability at pH 9 (deterioration of system stability as a result of solid surface charge neutralization by adsorbed LSZ). The BSA adsorption causes an insignificant increase of the ZrO2 suspension stability, which is connected with electrosteric forces appearance. The exopolysaccharide presence results in slight decrease of the solid system stability (polymer bridges formation at pH 6 and 9).
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