Uptake of some divalent metal ions on layered α-vopo4.2.5h2o and its 1, 10- phenanthroline, 2, 2-bipyridyl and 4, 4-bipyridyl intercalated products

Abstract EN

The crystalline layered α-vanadyl phosphate, α-VOPO4.2.5H2O, was prepared and characterized.

Its intercalated products VOPO4 (1, 10-phen) 0.33, 0.6H2O, VOPO4 (2, 2′-bipy) 0.36, 0.25 H2O and VOPO4 (4,4′-bipy) 0.4, were prepared by direct contact of α-VOPO4.2.5H2O with 0.1 M organic ligand in ethanol with stirring for 7 days at room temperature.

The resulting products were characterized by chemical and thermal analysis.

The distribution coefficients (Kd values) for a mixture of 0.05M nitric acid solution of the divalent metal ions Co2+, Ni2+, Cu2+, Zn2,+ Cd2+ and Pb2+ were determined simultaneously by (ICP) technique after equilibration with VOPO4.2.5H2O and its intercalated products at pH 2 and 4.

The (Kd values) for Pb2+ ions were higher than those for other metal ions, especially at pH4.

Possible selective separation of Pb2+ is quite evident.

The selectivity order was found to be dependent on the pH and on the nature of the intercalated ligand.

Partial ligand release of intercalated products at pH 2 observed.