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Adsorption of Cadmium on Titanium Dioxide Nanoparticles in Freshwater Conditions – A Chemodynamic Study |
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| Authors: | Gonçalo Vale Cristiana Franco Anna M Brunnert Margarida M Correia dos Santos |
| Institution: | 1. Centro de Química Estrutural, Instituto Superior Técnico da Universidade de Lisboa, Torre Sul, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal;2. Instrumentelle Analytische Chemie, Universit?t Duisburg‐Essen, Campus Essen, Fakult?t für Chemie, Universit?tsstr. 5, D‐45141 Essen, Germany |
| Abstract: | The adsorption of Cd onto two titanium dioxide nanoparticles (nTiO2) with distinct crystalline phases and sizes was investigated in conditions that can be found in freshwater systems (I=0.01 M, pH 6.0–8.5). Cd dynamic speciation was assessed by two distinct electroanalytical techniques: absence of gradients and nernstian equilibrium stripping (AGNES) and scanned stripping chronopotentiometry (SSCP). With both NPs, 1 : 1 CdTiO2 homogeneous and labile surface complexes are formed. To our knowledge this is the first study about the dynamic nature of the nTiO2 surface complexes formed in the presence of Cd. |
| Keywords: | Cadmium TiO2 nanoparticles Dynamic speciation Adsorption Surface complexation modelling |