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Synthesis and direct interactions of silver colloidal nanoparticles with pollutant gases

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Abstract

Silver nanoparticles (NPs) were synthesized in organic solvents. Spontaneous reduction of silver salts takes place in N,N′-dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) at room temperature. The formed colloids are not stable without a stabilizing agent, hence rarely used, and inexpensive organic molecules (β-cyclodextrin and cholic acid) were used as surface modifiers in DMF. The stabilization was successful; the Ag NPs remained stable for more than 3 months. Additionally, Ag NPs were prepared using Ag-2-ethylhexanoate and Na-citrate as capping agent in DMSO. The resulting NPs are stable, of 4.4 nm average size, and at the same time reactive for catalytic purposes. The interaction of Ag NPs with pollutant atmospheric gases (NO and SO2) was studied. UV–visible spectra show the oxidation of silver and the very efficient reduction of NO at room temperature. SO2 molecules are adsorbed on the NPs surface, causing their aggregation and precipitation.

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Acknowledgments

R.P. gives thanks to DGAPA UNAM for the post-doc fellowship. We also thank L. Rendon for HRTEM observation assistance. The authors are also thankful to the Central Microscopy facilities of the Institute of Physics, UNAM. D.D. wants to thank CONACyT E43662 and DGAPA UNAM IN110405 for financial support. Finally, the authors want to thank Dr. M. Iglesias-Arteaga for providing us cholic acid.

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Author notes

  1. Geonel Rodriguez-Gattorno

    Present address: Centro de Investigaciones Avanzadas del IPN, Merida, 97310, Yucatán, Mexico

Authors and Affiliations

  1. Facultad de Química, Universidad Nacional Autónoma de México. Coyoacán, 04510, Mexico D.F., Mexico

    Rita Patakfalvi, David Diaz, Donaji Velasco-Arias & Geonel Rodriguez-Gattorno

  2. Instituto de Física, Universidad Nacional Autónoma de México. Coyoacán, 04510, Mexico D.F., Mexico

    Patricia Santiago-Jacinto

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  1. Rita Patakfalvi
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  2. David Diaz
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  3. Donaji Velasco-Arias
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  4. Geonel Rodriguez-Gattorno
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  5. Patricia Santiago-Jacinto
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Correspondence to David Diaz.

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Patakfalvi, R., Diaz, D., Velasco-Arias, D. et al. Synthesis and direct interactions of silver colloidal nanoparticles with pollutant gases. Colloid Polym Sci 286, 67–77 (2008). https://doi.org/10.1007/s00396-007-1702-0

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  • DOI: https://doi.org/10.1007/s00396-007-1702-0

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