TY - JOUR

T1 - Electrosurface characteristics of titanium dioxide in solutions of simple electrolytes: I. Effect of nature of counterions on adsorption and electrokinetic parameters of TiO2

AU - Volkova, A.V.

AU - Ermakova, L.E.

AU - Bogdanova, N.F.

AU - Tarabukina, E.A.

AU - Sidorova, M.P

PY - 2010

Y1 - 2010

N2 - The adsorption and electrokinetic characteristics of different titanium dioxide samples (produced by the Merck Co. and synthesized by the sol-gel method) are studied depending on the pH, background electrolyte concentration, and the nature of counterions (halide ions and Na+, K+, Ba2+, and La3+ metal ions). It is revealed that, in the presence of an indifferent electrolyte, the points of zero charge (PZC) for the synthesized TiO2 sample and the Merck sample correspond to pH = 6.0 ± 0.1 and 5.0, respectively. It is found that the nature of halide ions has almost no influence on the magnitude of the TiO2 surface charge σ0 (in the region of its positive values) and the position of PZC. An increase in the specificity of cations with a rise in the charge causes PZC shift to the acidic region and enhances the absolute values of σ0 at both negative and positive surface charges. It is established that the positions of PZC and isoelectric point in 10-2 M solutions of the examined 1: 1 electrolytes nearly coincide with

AB - The adsorption and electrokinetic characteristics of different titanium dioxide samples (produced by the Merck Co. and synthesized by the sol-gel method) are studied depending on the pH, background electrolyte concentration, and the nature of counterions (halide ions and Na+, K+, Ba2+, and La3+ metal ions). It is revealed that, in the presence of an indifferent electrolyte, the points of zero charge (PZC) for the synthesized TiO2 sample and the Merck sample correspond to pH = 6.0 ± 0.1 and 5.0, respectively. It is found that the nature of halide ions has almost no influence on the magnitude of the TiO2 surface charge σ0 (in the region of its positive values) and the position of PZC. An increase in the specificity of cations with a rise in the charge causes PZC shift to the acidic region and enhances the absolute values of σ0 at both negative and positive surface charges. It is established that the positions of PZC and isoelectric point in 10-2 M solutions of the examined 1: 1 electrolytes nearly coincide with

M3 - Article

VL - 72

SP - 743

EP - 748

JO - Colloid Journal

JF - Colloid Journal

SN - 1061-933X

IS - 6

ER -