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Aqueous Long-Term Solubility of Titania Nanoparticles and Titanium(IV) Hydrolysis in a Sodium Chloride System Studied by Adsorptive Stripping Voltammetry

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Abstract

The solubility of industrially produced titanium dioxide nanoparticles has been studied in aqueous sodium chloride media in the pH range 1 to 13 at 25 °C by using adsorptive stripping voltammetry (AdSV). Kinetic dissolution curves have been obtained as well as long-term solubilities that provide an approximation of the equilibrium solubilities. The titania nanoparticles used in the dissolution experiments have been characterized by nitrogen sorption measurements, XRD and colloid titration. The equilibrium solubilities and titanium(IV) speciation and their dependences on pH have been modelled by assuming the formation of the mononuclear titanium hydroxo complexes [Ti(OH) n ](4−n)+ (n=2 to 5) to be the only titanium species present. The solubility product of titanium dioxide and equilibrium constants for titanium(IV) hydrolysis, calculated from the AdSV solubility data, are presented.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Chemistry and Earth Science Faculty, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743, Jena, Germany

    Jochen Schmidt & Wolfram Vogelsberger

  2. Institute of Particle Technology, University of Erlangen-Nuremberg, Cauerstrasse 4, 91058, Erlangen, Germany

    Jochen Schmidt

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  1. Jochen Schmidt
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  2. Wolfram Vogelsberger
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Correspondence to Jochen Schmidt.

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Schmidt, J., Vogelsberger, W. Aqueous Long-Term Solubility of Titania Nanoparticles and Titanium(IV) Hydrolysis in a Sodium Chloride System Studied by Adsorptive Stripping Voltammetry. J Solution Chem 38, 1267–1282 (2009). https://doi.org/10.1007/s10953-009-9445-9

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  • DOI: https://doi.org/10.1007/s10953-009-9445-9

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