Adsorption of Cadmium on Titanium Dioxide Nanoparticles in Freshwater Conditions – A Chemodynamic Study

Abstract

Abstract The adsorption of Cd onto two titanium dioxide nanoparticles (nTiO 2 ) 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 CdTiO 2 homogeneous and labile surface complexes are formed. To our knowledge this is the first study about the dynamic nature of the nTiO 2 surface complexes formed in the presence of Cd.