期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 151, 期 -, 页码 156-163出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.06.093
关键词
Cadmium; Lead; Silica nanoparticles; EXAFS; DFT; MEH-PPV
类别
资金
- Grant PICT from Agencia Nacional de Promocion Cientifica y Tecnologica, (ANPCyT, Argentina) [0686]
- PIP (CONICET, Argentina) [01035]
- LNLS (Brasil) [XAFS1-14534]
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+. (C) 2015 Elsevier B.V. All rights reserved.
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