Electokinetic and adsorption properties of different titanium dioxides at the solid/solution interface
| Autor: | Władysław Janusz, Jadwiga Skubiszewska-Zięba, Ewa Skwarek, Roman Leboda, Svitlana Khalameida, Volodymyr Sydorchuk |
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| Rok vydání: | 2014 |
| Předmět: |
Aqueous solution
surface charge density Chemistry Inorganic chemistry Analytical chemistry General Chemistry Electrolyte mono- and biphase tio2 zeta potential Electrophoresis Adsorption Isoelectric point electrical double layer Ionic strength Materials Chemistry Zeta potential adsorption of zn (ii) ions QD1-999 Solid solution |
| Zdroj: | Open Chemistry, Vol 12, Iss 11, Pp 1194-1205 (2014) |
| ISSN: | 2391-5420 |
| DOI: | 10.2478/s11532-014-0568-5 |
| Popis: | Six samples of titanium dioxide of different phase compositions and specific surface areas have been characterized by XRD, Raman-and FTIR spectroscopy, adsorption of nitrogen, electrophoresis. Adsorption of Zn(II) ions at the TiO2/NaCl aqueous solution interface as well as the effect of adsorption on the structure of electrical double layer have been studied. The influence of ionic strength, pH and presence of ions on the adsorption of Zn(II) ions at the TiO2/NaCl solution interface have also been investigated. The zeta potential, surface charge density, parameters of adsorption edge pH50% and ΔpH10–90% for different concentrations of basic electrolyte have been determined. Studied unpurified samples showed lower values of isoelectric point pHiep compared with literature data due to the presence of anion impurities. The antibate dependence between pHiep values and particle size has been established. Adsorption of Zn(II) ions using monophase samples is completed at a lower pH than for the biphase TiO2. Appearance of the point CR3 is associated with the charge turnover from positive to negative at high values of pH and formation of Zn(OH)2. |
| Databáze: | OpenAIRE |
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