CINDEFI 05381
CENTRO DE INVESTIGACION Y DESARROLLO EN FERMENTACIONES INDUSTRIALES
Unidad Ejecutora - UE
artículos
Título:
EXAFS and DFT Study of the Cadmium and Lead Adsorption on Modified Silica Nanoparticles
Autor/es:
ARCE V.; GARGARELLO R.; ORTEGA F.; ROMANANO V.; MIZHARI M.; RAMALLO-LOPEZ J.M.; COBOS C.; AIROLDI C.; BERNADELLI C.; DONATI E.R.; MARTIRE D.
Revista:
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY.
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 151 p. 156 - 163
ISSN:
1386-1425
Resumen:
Silica nanoparticles of 7 nm diameter were modified with (3-aminopropyl) triethoxysilane (APTES) andcharacterized by CP-MAS 13C and 29Si NMR, FTIR, zeta potential measurements, and thermogravimetry.The particles were shown to sorb successfully divalent lead and cadmium ions from aqueous solution.Lead complexation with these silica nanoparticles was clearly confirmed by EXAFS (Extended X-rayAbsorption Fine Structure) with synchrotron light measurements. Predicted Pb?N and Pb?C distancesobtained from quantum-chemical calculations are in very good agreement with the EXAFS determinations.The calculations also support the higher APTES affinity for Pb2+ compared to Cd2+.
