TY - JOUR
T1 - Electroacoustic study of titania at high concentrations of 1-2, 2-1 and 2-2 electrolytes
AU - Kosmulski, Marek
AU - Prochniak, Piotr
AU - Rosenholm, Jarl B.
PY - 2009/5
Y1 - 2009/5
N2 - The electrokinetic potentials of titania were studied over a pH range 3-9 in the presence of alkali metal sulfates, alkaline earth metal chlorides and MgSO4 at concentrations up to 1 mol dm-3 by means of the electroacoustic method. The electrokinetic potentials measured at concentrations of 0.1 mol dm-3 or higher of 1-2, 2-1 and 2-2 electrolytes were rather insensitive to the pH, and no IEP was observed. Positive electrokinetic potentials were observed in the presence of alkaline earth metal chlorides and negative electrokinetic potentials were observed in the presence of alkali metal sulfates and MgSO4. This result is consistent with specific adsorption of alkaline earth metal cations and of sulfate anion on titania, which is also observed at lower ionic strengths. The present results indicate that the electrokinetic potential does not cease at ionic strengths of about 1 mol dm-3, as it might be expected from extrapolation of the trends observed at lower ionic strengths. © 2009 Elsevier B.V. All rights reserved.
AB - The electrokinetic potentials of titania were studied over a pH range 3-9 in the presence of alkali metal sulfates, alkaline earth metal chlorides and MgSO4 at concentrations up to 1 mol dm-3 by means of the electroacoustic method. The electrokinetic potentials measured at concentrations of 0.1 mol dm-3 or higher of 1-2, 2-1 and 2-2 electrolytes were rather insensitive to the pH, and no IEP was observed. Positive electrokinetic potentials were observed in the presence of alkaline earth metal chlorides and negative electrokinetic potentials were observed in the presence of alkali metal sulfates and MgSO4. This result is consistent with specific adsorption of alkaline earth metal cations and of sulfate anion on titania, which is also observed at lower ionic strengths. The present results indicate that the electrokinetic potential does not cease at ionic strengths of about 1 mol dm-3, as it might be expected from extrapolation of the trends observed at lower ionic strengths. © 2009 Elsevier B.V. All rights reserved.
KW - Concentrated electrolyte solutions
KW - Electric double layer
KW - Isoelectric point
KW - Specific adsorption
KW - Zeta potential
UR - https://www.mendeley.com/catalogue/1effbcaf-f892-3626-8f4e-d808c6767d5f/
U2 - 10.1016/j.colsurfa.2009.04.041
DO - 10.1016/j.colsurfa.2009.04.041
M3 - Article
SN - 0927-7757
VL - 345
SP - 106
EP - 111
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1-3
ER -