INIFTA 05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
EXAFS and DFT Study of the Cadmium and Lead Adsorption on Modified Silica Nanoparticles
Autor/es:
VALERIA B. ARCE; ROMINA M. GARGARELLO; FLORENCIA ORTEGA; VIRGINIA ROMAÑANO; MARTÍN MIZRAHI; JOSÉ M. RAMALLO-LÓPEZ; CARLOS J. COBOS; CLAUDIO AIROLDI; CECILIA BERNARDELLI; EDGARDO R. DONATI; DANIEL O. MÁRTIRE
Revista:
SPECTROCHIMICA ACTA A: MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Editorial:
ELSEVIER
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 151 p. 156 - 163
ISSN:
0584-8539
Resumen:
Silica nanoparticles of 7 nm diameter were modified with (3-aminopropyl) triethoxysilane (APTES) and characterized by CP-MAS 13Cand 29Si NMR, FTIR, zeta potential measurements, and thermogravimetry. The particles were shown to sorb successfully divalent leadand cadmium ions from aqueous solution. Lead complexation with these silicanano particles was clearly confirmed by EXAFS (Extended X-ray Absorption FineStructure) with synchrotron light measurements. Predicted Pb-N and Pb-Cdistances obtained from quantum-chemical calculations are invery good agreement with the EXAFS determinations. The calculations also support the higher APTES affinity for Pb2+ compared to Cd2+.
