Removal of oxovanadium(IV) from aqueous solutions by using

E. D. VEGA; J. C. PEDREGOSA; G. E. NARDA; P. J. MORANDO

WATER RESEARCH

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Delft; Año: 2003 vol. 37 p. 1776 - 1782

0043-1354

The interaction of oxovanadium(IV) (VO2+) in aqueous solution with commercial calcium hydroxyapatite (CAP) has been studied. VO2+ ions are adsorbed on the surface of CAP by coordination to OH groups, without modification of the crystalline lattice. The extent of the adsorption is followed by chemical analysis, ESR and IR spectroscopy. Results are compared with those obtained for VO2+/synthetic calcium hydroxyapatite (HAP), reported by us in previous works. The uptake is better than the observed for HAP. The maximum adsorption is observed at pH 3.5 and 288 K. We conclude that VO2+ is indeed adsorbed on CAP and the extent of adsorption depends on the pH and temperature.2+) in aqueous solution with commercial calcium hydroxyapatite (CAP) has been studied. VO2+ ions are adsorbed on the surface of CAP by coordination to OH groups, without modification of the crystalline lattice. The extent of the adsorption is followed by chemical analysis, ESR and IR spectroscopy. Results are compared with those obtained for VO2+/synthetic calcium hydroxyapatite (HAP), reported by us in previous works. The uptake is better than the observed for HAP. The maximum adsorption is observed at pH 3.5 and 288 K. We conclude that VO2+ is indeed adsorbed on CAP and the extent of adsorption depends on the pH and temperature.2+ ions are adsorbed on the surface of CAP by coordination to OH groups, without modification of the crystalline lattice. The extent of the adsorption is followed by chemical analysis, ESR and IR spectroscopy. Results are compared with those obtained for VO2+/synthetic calcium hydroxyapatite (HAP), reported by us in previous works. The uptake is better than the observed for HAP. The maximum adsorption is observed at pH 3.5 and 288 K. We conclude that VO2+ is indeed adsorbed on CAP and the extent of adsorption depends on the pH and temperature.2+/synthetic calcium hydroxyapatite (HAP), reported by us in previous works. The uptake is better than the observed for HAP. The maximum adsorption is observed at pH 3.5 and 288 K. We conclude that VO2+ is indeed adsorbed on CAP and the extent of adsorption depends on the pH and temperature.2+ is indeed adsorbed on CAP and the extent of adsorption depends on the pH and temperature.