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Título del libro: Water-Rock Interaction
Título del capítulo: Interactions between four polycyclic aromatic hydrocarbons (PAHs) and the birnessite surface

Autores UNAM:
MARIO VILLALOBOS PEÑALOSA; RICHARD WILLIAM GIBSON; NORMA RUTH LOPEZ SANTIAGO;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Resumen:

The surface interaction of four polycyclic aromatic hydrocarbons (PAHs) with two layered manganese oxides, acid birnessite and d-MnO2, was investigated for the first time. Experiments were carried out both in hexane and in aqueous media. Fluorene and anthracene were oxidized by both Mn oxides, giving rise to 9-fluorenone and 9,10-anthraquinone, respectively; while phenanthrene and fluoranthene remained untransformed. However, d-MnO2 was capable of adsorbing the two latter PAHs, while acid birnessite was not, apparently due to the considerably larger specific surface area of the former (114 vs. 39 m2/g). The oxidation mechanism was found to take place, at least partly, through oxidation by the Mn(IV) oxide surfaces. The results presented suggests possible mineral surface-driven reaction pathways that may dictate PAH?s fate when released to the environment, if layered manganese oxides are present and natural organic matter is low or absent. © 2010 Taylor & Francis Group, London.


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