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Título del libro: Water-Rock Interaction
Título del capítulo: Cr(VI) reduction at the magnetite-zero-valent iron/water interface

Autores UNAM:
MARIO VILLALOBOS PEÑALOSA;
Autores externos:
Idioma:
Inglés
Año de publicación:
2010
Resumen:

Chemical reduction of highly mobile Cr(VI) to immobile Cr(III) is one of the most utilized methods to remediate Cr(VI)-contaminated environments. The mineral magnetite provides an adequate reducing capacity but the surface-driven reaction is passivated by consumption of available surface Fe(II), which is oxidized to Fe(III), and the reduction yields obtained are not optimal. Its mixture with metallic Fe(0) appears to provide an appropriate medium for replenishment of the Fe(II) lost at the surface. The goals of the present work were (1) to investigate this reduction yield as a function of time, particle size, and proportion of magnetite/Fe(0), and (2) to test the performance of a natural magnetite sample containing small particle sizes, in this process. It was found that a very small (1?5% weight) proportion of Fe(0) increases considerably both the Cr(VI) reduction rate and yield, which are directly proportional to the available magnetite surface area. © 2010 Taylor & Francis Group, London.

Entidades citadas de la UNAM:
Fuente:


ISBN:
9781439862995
Editorial:
CRC Press Nombre de la publicación:
Cr(VI) reduction at the magnetite-zero-valent iron/water interface
Página inicial:
685
Página final:
688

Tipo de producto:
Capítulo de un Libro