Nanoscale zero valent supported by Zeolite and Montmorillonite: Template effect of the removal of lead ion from an aqueous solution
Author
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Arancibia Miranda, Nicolás
Author
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Baltazar, Samuel E.
Author
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García, Alejandra
Author
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Muñoz Lira, Daniela
Author
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Sepúlveda, Pamela
Author
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Rubio, María A.
Author
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Altbir, Dora
Admission date
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2016-01-28T14:18:05Z
Available date
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2016-01-28T14:18:05Z
Publication date
dc.date.issued
2016
Cita de ítem
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Journal of Hazardous Materials 301 (2016) 371–380
en_US
Identifier
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DOI: 10.1016/j.jhazmat.2015.09.007
Identifier
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https://repositorio.uchile.cl/handle/2250/136831
General note
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Artículo de publicación ISI
en_US
Abstract
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In this work, we have studied the Pb2+ sorption capacity of Zeolite (Z) and Montmorillonite (Mt) functionalized with nanoscale zero-valent iron (nZVI), at 50% w/w, obtained by means of an impregnating process with a solvent excess. The composites were characterized by several techniques including X-ray diffraction; scanning electron microscopy (SEM); BET area; isoelectric point (IEP); and, finally a magnetic response. Comparatively significant differences in terms of electrophoretic and magnetic characteristics were found between the pristine materials and the composites. Both structures show a high efficiency and velocity in the removal of Pb2+ up to 99.0% (200.0 ppm) after 40 min of reaction time. The removal kinetics of Pb2+ is adequately described by the pseudo second-order kinetic model, and the maximum adsorbed amounts (q(e)) of this analyte are in close accordance with the experimental results. The intra-particle diffusion model shows that this is not the only rate-limiting step, this being the Langmuir model which was well adjusted to our experimental data. Therefore, maximum sorption capacities were found to be 115.1 +/- 11.0, 105.5 +/- 9.0, 68.3 +/- 1.3, 54.2 +/- 1.3, and 50.3 +/- 4.2 mg g(-1), for Mt-nZVI, Z-nZVI, Zeolite, Mt, and nZVI, respectively. The higher sorption capacities can be attributed to the synergetic behavior between the clay and iron nanoparticles, as a consequence of the clay coating process with nZVI. These results suggest that both composites could be used as an efficient adsorbent for the removal of lead from contaminated water sources.
en_US
Patrocinador
dc.description.sponsorship
FONDECYT
11100439
11130157
1120356
Conicyt
79090022
ICM by Fondo de Innovacion para la Competitividad-Minecon
P10-061-F
Basal Funding for Scientific and Technological Centers
FB0807