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Adsorption of Cadmium on Titanium Dioxide Nanoparticles in Freshwater Conditions – A Chemodynamic Study
Author(s) -
Vale Gonçalo,
Franco Cristiana,
Brunnert Anna M.,
Correia dos Santos Margarida M.
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500153
Subject(s) - adsorption , stripping (fiber) , cadmium , titanium dioxide , nanoparticle , chemistry , inorganic chemistry , desorption , genetic algorithm , homogeneous , nuclear chemistry , materials science , nanotechnology , metallurgy , organic chemistry , physics , evolutionary biology , composite material , biology , thermodynamics
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.