Repositorio
Institucional

Garrido-Ramirez, E. G.

Mora, M. L.

Marco, J. F.

Ureta-Zanartu, M. S.

Characterization of nanostructured allophane clays and their use as support of iron species in a heterogeneous electro-Fenton system

ELSEVIER SCIENCE BV

APPLIED CLAY SCIENCE

en

Nanostructured allophane clays supported with iron oxide (AlSi2Fe6) were characterized by X-ray photoelectron spectroscopy (XPS) and Mossbauer spectroscopy showing the presence of both Fe3+ and Fe2+ species on the allophane surface. A glassy carbon disk (GC) modified with a film obtained by the deposition of drops of a dispersion formed by graphite and AlSi2Fe6 in water was used as working electrode in a heterogeneous electro-Fenton system (HE-Fenton) for the oxidation of atrazine. The effect of the initial pHs and the proportion of AlSi2Fe6/graphite in the mixture were studied and compared with the heterogeneous Fenton process. The HE-Fenton system using AlSi2Fe6-GC electrodes showed higher efficiency towards the oxidation of atrazine than the heterogeneous Fenton one; mainly due to the continuous and simultaneous electro-regeneration of iron species (Fe-3+/Fe2+) and electro-generation of hydrogen peroxide by the oxygen reduction process. The degradation of atrazine in this HE-Fenton system reached almost 100% at pH 3.0 after 8 h, whereas at more neutral pH (similar to 6) a 76% of degradation was obtained. Two reaction products were identified by HPLC: desethyl-atrazine (DEA) and desethyl-desisopropyl-atrazine (DEIA). (C) 2013 Elsevier B.V. All rights reserved.

Artículo original

This work was supported by a CONICYT Doctoral Scholarship as well as by a Scholarship for Implementation of Doctoral Theses 2010 (AT-24100139). FONDECYT (Projects 1100476 and 3130725) are gratefully acknowledged for their financial support.

Este trabajo fue financiado por una beca doctoral de CONICYT y por una beca para la realización de tesis doctorales 2010 (AT-24100139). Se agradece el apoyo financiero de FONDECYT (Proyectos 1100476 y 3130725).

10.1016/j.clay.2013.10.001

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Atrazine oxidation

Heterogeneous Fenton

Heterogeneous electro-Fenton

Nanostructured allophane clays supported with iron oxide

ADVANCED OXIDATION PROCESSES

WET PEROXIDE OXIDATION

CARBON-PASTE ELECTRODE

WASTE-WATER TREATMENT

COMPOSITE CATHODE

ORGANIC-COMPOUND

AQUEOUS-MEDIUM

ATRAZINE

DEGRADATION

OXIDE

Oxidación de atrazina

Fenton heterogéneo

Electro-Fenton heterogéneo

Arcillas de alófano nanoestructuradas soportadas con óxido de hierro

PROCESOS DE OXIDACIÓN AVANZADA

OXIDACIÓN HÚMEDA CON PERÓXIDO

ELECTRODO DE PASTA DE CARBONO

TRATAMIENTO DE AGUAS RESIDUALES

CÁTODO COMPUESTO

COMPUESTO ORGÁNICO

MEDIO ACUOSO

ATRAZINA

DEGRADACIÓN

ÓXIDO

Atrazine oxidation

Heterogeneous Fenton

Heterogeneous electro-Fenton

Nanostructured allophane clays supported with iron oxide

ADVANCED OXIDATION PROCESSES

WET PEROXIDE OXIDATION

CARBON-PASTE ELECTRODE

WASTE-WATER TREATMENT

COMPOSITE CATHODE

ORGANIC-COMPOUND

AQUEOUS-MEDIUM

ATRAZINE

DEGRADATION

OXIDE

Oxidación de atrazina

Fenton heterogéneo

Electro-Fenton heterogéneo

Arcillas de alófano nanoestructuradas soportadas con óxido de hierro

PROCESOS DE OXIDACIÓN AVANZADA

OXIDACIÓN HÚMEDA CON PERÓXIDO

ELECTRODO DE PASTA DE CARBONO

TRATAMIENTO DE AGUAS RESIDUALES

CÁTODO COMPUESTO

COMPUESTO ORGÁNICO

MEDIO ACUOSO

ATRAZINA

DEGRADACIÓN

ÓXIDO

Electroquímica

Química Analítica

Ingeniería Química

Characterization of nanostructured allophane clays and their use as support of iron species in a heterogeneous electro-Fenton system

APPLIED CLAY SCIENCE

hibrida

verde

metadata

metadata

en

Artículo original

versión publicada

ANID CONICYT FONDECYT 1100476#ANID CONICYT 3130725#ANID CONICYT AT-24100139

ANID CONICYT FONDECYT 1100476

ANID CONICYT 3130725

ANID CONICYT AT-24100139

ELSEVIER SCIENCE BV

0169-1317

153

161

Química física

Ciencia de los materiales multidisciplinaria

Mineralogía

Chemistry, Physical

Materials Science, Multidisciplinary

Mineralogy

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WOS:000328597100020