EXAFS and DFT Study of the Cadmium and Lead Adsorption on Modified Silica Nanoparticles

Silica nanoparticles of 7 nm diameter modified with (3-aminopropyl) triethoxysilane (APTES) and characterized 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-ray Absorption Fine Structure) with synchrotron light measurements. Predicted Pb?N and Pb?C distances obtained 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+.

Palabras clave: Cadmiun , Lead , Silica Nanoparticles , Exafs

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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)

Identificadores

URI: http://hdl.handle.net/11336/7820

URL: http://www.sciencedirect.com/science/article/pii/S1386142515007891

DOI: http://dx.doi.org/10.1016/j.saa.2015.06.093

Colecciones

Articulos(CINDEFI)
Articulos de CENT.DE INV EN FERMENTACIONES INDUSTRIALES (I)

Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.

Citación

Arce, Valeria B.; Gargarello, Romina; Ortega, Florencia; Romañano, Virginia; Mizrahi, Martin Daniel; et al.; EXAFS and DFT Study of the Cadmium and Lead Adsorption on Modified Silica Nanoparticles; Elsevier; Spectrochimica Acta Part A: Molecular And Biomolecular Spectroscopy; 151; 7-2015; 156-163

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