High ionic strength electrokinetics of anatase in the presence of multivalent inorganic ions

Marek Kosmulski; Jarl B. Rosenholm

doi:10.1016/j.colsurfa.2004.09.009

High ionic strength electrokinetics of anatase in the presence of multivalent inorganic ions

Marek Kosmulski, Jarl B. Rosenholm

Laboratory of Molecular Science and Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

15 Citations (Scopus)

Abstract

Shifts in the IEP of anatase induced by various combinations of 1:1 electrolytes (at concentration of 0.5 mol dm-3) and multivalent ions (concentrations in millimolar range) were studied. The high ionic strength enhanced the shift in the IEP of anatase to high pH induced by specific adsorption of barium and suppressed the shift in the IEP of anatase to low pH induced by specific adsorption of phosphate. The ζ potential of anatase at pH 3-5 is nearly zero in the presence of 0.01 mol dm-3 of sulfate at low ionic strength, but it assumes a positive value as high as 15 mV in the presence of 0.5 mol dm-3 NaI at otherwise the same conditions. Apparently, the contribution of 1:1 electrolytes to the surface charging at high ionic strengths is not mere neutralisation of the proton charge. © 2004 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	121-126
Number of pages	6
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	248
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2004.09.009
Publication status	Published - Sept 2004
MoE publication type	A1 Journal article-refereed

Keywords

Concentrated electrolyte solutions
Electric sonic amplitude
Isoelectric point
Specific adsorption
Zeta potential

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10.1016/j.colsurfa.2004.09.009

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abstract = "Shifts in the IEP of anatase induced by various combinations of 1:1 electrolytes (at concentration of 0.5 mol dm-3) and multivalent ions (concentrations in millimolar range) were studied. The high ionic strength enhanced the shift in the IEP of anatase to high pH induced by specific adsorption of barium and suppressed the shift in the IEP of anatase to low pH induced by specific adsorption of phosphate. The ζ potential of anatase at pH 3-5 is nearly zero in the presence of 0.01 mol dm-3 of sulfate at low ionic strength, but it assumes a positive value as high as 15 mV in the presence of 0.5 mol dm-3 NaI at otherwise the same conditions. Apparently, the contribution of 1:1 electrolytes to the surface charging at high ionic strengths is not mere neutralisation of the proton charge. {\textcopyright} 2004 Elsevier B.V. All rights reserved.",

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KW - Concentrated electrolyte solutions

KW - Electric sonic amplitude

KW - Isoelectric point

KW - Specific adsorption

KW - Zeta potential

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High ionic strength electrokinetics of anatase in the presence of multivalent inorganic ions

Abstract

Keywords

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