EXAFS and DFT study of the cadmium and lead adsorption on modified silica nanoparticles

Silica nanoparticles of 7 nm diameter were modified with (3-aminopropyl) triethoxysilane (APTES) and characterized by CP-MAS <sup>13</sup>C and <sup>29</sup>Si NMR, FTIR, zeta potential measurements, and thermogravimetry. The particles were shown to sorb successfully divalent...

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Detalles Bibliográficos
Autores principales: Arce, Valeria Beatriz, Gargarello, Romina M., Ortega, Florencia, Romañano, Virginia, Mizrahi, Martín D., Ramallo López, José Martín, Cobos, Carlos Jorge, Airoldi, Claudio, Bernardelli, Cecilia Elena, Donati, Edgardo Rubén, Mártire, Daniel Osvaldo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Exactas
Cadmium
Lead
Silica nanoparticles
EXAFS
DFT
MEH-PPV
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/108444
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:Silica nanoparticles of 7 nm diameter were modified with (3-aminopropyl) triethoxysilane (APTES) and characterized by CP-MAS <sup>13</sup>C and <sup>29</sup>Si 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 Pb<sup>2+</sup> compared to Cd<sup>2+</sup>.

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