title: Novel electro-fenton approach for regeneration of activated carbon.
abstract: An electro-Fenton-based method was used to promote the regeneration of granular activated carbon (GAC) previously adsorbed with toluene. Electrochemical regeneration experiments were carried out using a standard laboratory electrochemical cell with carbon paste electrodes and a batch electrochemical reactor. For each system, a comparison was made using FeSO4 as a precursor salt in solution (homogeneous system) and an Fe-loaded ion-exchange resin (Purolite C-100, heterogeneous system), both in combination with electrogenerated H2O2 at the GAC cathode. In the two cases, high regeneration efficiencies were obtained in the presence of iron using appropriate conditions of applied potential and adsorption-polarization time. Consecutive loading and regeneration cycles of GAC were performed in the reactor without great loss of the adsorption properties, only reducing the regeneration efficiency by 1% per cycle during 10 cycles of treatment. Considering that, in the proposed resin-containing process, the use of Fe salts is avoided and that GAC cathodic polarization results in efficient cleaning and regeneration of the adsorbent material, this novel electro-Fenton approach could constitute an excellent alternative for regenerating activated carbon when compared to conventional methods.
authors.affiliation: Centro de Investigación y Desarrollo Tecnológico en Electroquímica , Parque Tecnológico Querétaro Sanfandila, Pedro Escobedo, Querétaro 76703, Mexico.
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Bañuelos
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Rodríguez
authors.forename: Juan
authors.initials: J
authors.lastname: Manríquez Rocha
authors.forename: Erika
authors.initials: E
authors.lastname: Bustos
authors.forename: Adrián
authors.initials: A
authors.lastname: Rodríguez
authors.forename: Julio C
authors.initials: JC
authors.lastname: Cruz
authors.forename: L G
authors.initials: LG
authors.lastname: Arriaga
authors.forename: Luis A
authors.initials: LA
authors.lastname: Godínez
mesh_terms: D002244:Carbon / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes
chemical_list: D002244:Carbon