Effect of electrochemical treatments on the surface chemistry of activated carbon
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Título: | Effect of electrochemical treatments on the surface chemistry of activated carbon |
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Autor/es: | Berenguer Betrián, Raúl | Marco Lozar, Juan Pablo | Quijada Tomás, César | Cazorla-Amorós, Diego | Morallon, Emilia |
Grupo/s de investigación o GITE: | Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales | Universidad Politécnica de Valencia. Departamento de Ingeniería Textil y Papelera |
Palabras clave: | Activated carbon | Electrochemical treatment | Surface chemistry |
Área/s de conocimiento: | Química Física |
Fecha de creación: | jun-2008 |
Fecha de publicación: | abr-2009 |
Editor: | Elsevier |
Cita bibliográfica: | BERENGUER BETRIÁN, Raúl, et al. "Effect of electrochemical treatments on the surface chemistry of activated carbon". Carbon. Vol. 47, Issue 4 (Apr. 2009). ISSN 0008-6223, pp. 1018-1027 |
Resumen: | 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. |
Patrocinador/es: | Ministerio de Ciencia e Innovación-FEDER (MAT2007-60621 and CTQ2006-08958) and Generalitat Valenciana (Ayudas REVIV, ARVIV/2007/076). |
URI: | http://hdl.handle.net/10045/10523 |
ISSN: | 0008-6223 |
DOI: | 10.1016/j.carbon.2008.12.022 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.carbon.2008.12.022 |
Aparece en las colecciones: | INV - GEPE - Artículos de Revistas INV - MCMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Carbon47-09-1018_Tratamiento electroquimica CA.pdf | Versión final (acceso restringido) | 1,12 MB | Adobe PDF | Abrir Solicitar una copia |
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