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Type: Artigo
Title: EXAFS and DFT study of the cadmium and lead adsorption on modified silica nanoparticles
Author: Arce, Valeria B.
Gargarello, Romina M.
Ortega, Florencia
Romanano, Virginia
Mizrahi, Martin
Ramallo-Lopez, Jose M.
Cobos, Carlos J.
Airoldi, Claudio
Bernardelli, Cecilia
Donati, Edgardo R.
Martire, Daniel O.
Abstract: Silica nanoparticles of 7 nm diameter were modified with (3-aminopropyl) triethoxysilane (APTES) and characterized by CP-MAS C-13 and Si-29 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+
Subject: Cádmio
Nanopartículas de sílica
Country: Países Baixos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.saa.2015.06.093
Date Issue: 2015
Appears in Collections:IQ - Artigos e Outros Documentos

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