Effect of electrochemical treatments on the surface chemistry of activated carbon

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Title: Effect of electrochemical treatments on the surface chemistry of activated carbon
Authors: Berenguer Betrián, Raúl | Marco Lozar, Juan Pablo | Quijada Tomás, César | Cazorla-Amorós, Diego | Morallon, Emilia
Research Group/s: Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente
Center, Department or Service: 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
Keywords: Activated carbon | Electrochemical treatment | Surface chemistry
Knowledge Area: Química Física
Date Created: Jun-2008
Issue Date: Apr-2009
Publisher: Elsevier
Citation: 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
Abstract: 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.
Sponsor: 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
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.carbon.2008.12.022
Appears in Collections:INV - GEPE - Artículos de Revistas
INV - MCMA - Artículos de Revistas

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