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Título: Effect of electrochemical treatments on the surface chemistry of activated carbon
Autores: Berenguer Betrián, Raúl
Marco Lozar, Juan Pablo
Quijada Tomás, César
Cazorla Amorós, Diego
Morallón Núñez, Emilia
Fecha: 2009-05-19
2009-05-19
2008-06
2009-04
Publicador: Elsevier
Fuente: Ver documento
Tipo: info:eu-repo/semantics/article
Tema: Activated carbon
Electrochemical treatment
Surface chemistry
Química Física
Descripción: The effect of the electrochemical treatment (galvanostatic electrolysis in a filter-press electrochemical cell) on the surface chemistry and porous structure of a granular activated carbon (GAC) has been analyzed by means of temperature-programmed desorption and N2 (at 77 K) and CO2 (at 273 K) adsorption isotherms. The anodic and cathodic treatments, the applied current (between 0.2 and 2.0 A) and the type of electrolyte (NaOH, H2SO4 and NaCl)have been studied as electrochemical variables. Both anodic and cathodic treatments lead to an increase in the surface oxygen groups. A suitable choice of the electrochemical variables allows a selective modification of the amount and the nature of the surface oxygen groups of the GAC. In general, the electrochemical treatment does not modify significantly the textural properties of the GAC. However, an increase in the porosity of the activated carbon occurs during the cathodic treatment in oxygen-saturated solutions. This result is interpreted as a consequence of carbon gasification driven by reaction with peroxide species generated by electroreduction of oxygen. The anodic treatment in NaCl produces oxidation degrees comparable to those achieved by classical chemical oxidations.
Ministerio de Ciencia e Innovación-FEDER (MAT2007-60621 and CTQ2006-08958) and Generalitat Valenciana (Ayudas REVIV, ARVIV/2007/076).
Idioma: Inglés
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