The adsorption characteristics of Cu(II) in the presence of chelating agents was investigated in the laboratory. The results showed that the presence of chelating agents improved the extent of Cu(II) adsorption, although ligand:Cu(II) ratio = 1:1 seemed to be important to assure optimum Cu(II) adsorption, at least in the Cu(II)-NTA-γ-Al2O3 system. Electrostatic interaction appeared to be an important mechanism for complexed Cu(II) adsorption. However, a finite adsorption of Cu(II) complexes of NTA, glycine, and aspartic acid was observed at the pHzpc of γ-Al2O3. This suggests the presence of specific chemical interaction. The adsorbed Cu(II) species in the presence of chelating agents, such as NTA, is the complexed form, i.e., CuNTA-. A model has been proposed to qualitatively explain the attachment of CuNTA- species onto γ-Al2O3 surface.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry