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

E. G. Garrido-Ramírez; M. L. Mora; J. F. Marco; M. S. Ureta-Zañartu

doi:10.1016/j.clay.2013.10.001

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

E. G. Garrido-Ramírez, M. L. Mora, J. F. Marco, M. S. Ureta-Zañartu

Life Sciences School

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

Nanostructured allophane clays supported with iron oxide (AlSi2Fe6) were characterized by X-ray photoelectron spectroscopy (XPS) and Mössbauer spectroscopy showing the presence of both Fe^3 + and Fe^2 + 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 +/Fe^2 +) 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 (~ 6) a 76% of degradation was obtained. Two reaction products were identified by HPLC: desethyl-atrazine (DEA) and desethyl-desisopropyl-atrazine (DEIA).

Original language	English
Pages (from-to)	153-161
Number of pages	9
Journal	Applied Clay Science
Volume	86
DOIs	https://doi.org/10.1016/j.clay.2013.10.001
Publication status	Published - Dec 2013

Keywords

Atrazine oxidation
Heterogeneous Fenton
Heterogeneous electro-Fenton
Nanostructured allophane clays supported with iron oxide

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/j.clay.2013.10.001

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@article{f9ff190463364ddf8e228663e8b939e6,

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

abstract = "Nanostructured allophane clays supported with iron oxide (AlSi2Fe6) were characterized by X-ray photoelectron spectroscopy (XPS) and M{\"o}ssbauer 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 (Fe3 +/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 (~ 6) a 76% of degradation was obtained. Two reaction products were identified by HPLC: desethyl-atrazine (DEA) and desethyl-desisopropyl-atrazine (DEIA).",

keywords = "Atrazine oxidation, Heterogeneous Fenton, Heterogeneous electro-Fenton, Nanostructured allophane clays supported with iron oxide",

author = "Garrido-Ram{\'i}rez, {E. G.} and Mora, {M. L.} and Marco, {J. F.} and Ureta-Za{\~n}artu, {M. S.}",

note = "Funding Information: 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.",

year = "2013",

month = dec,

doi = "10.1016/j.clay.2013.10.001",

language = "English",

volume = "86",

pages = "153--161",

journal = "Applied Clay Science",

issn = "0169-1317",

publisher = "Elsevier B.V.",

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T1 - Characterization of nanostructured allophane clays and their use as support of iron species in a heterogeneous electro-Fenton system

AU - Garrido-Ramírez, E. G.

AU - Mora, M. L.

AU - Marco, J. F.

AU - Ureta-Zañartu, M. S.

N1 - Funding Information: 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.

PY - 2013/12

Y1 - 2013/12

N2 - Nanostructured allophane clays supported with iron oxide (AlSi2Fe6) were characterized by X-ray photoelectron spectroscopy (XPS) and Mössbauer 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 (Fe3 +/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 (~ 6) a 76% of degradation was obtained. Two reaction products were identified by HPLC: desethyl-atrazine (DEA) and desethyl-desisopropyl-atrazine (DEIA).

AB - Nanostructured allophane clays supported with iron oxide (AlSi2Fe6) were characterized by X-ray photoelectron spectroscopy (XPS) and Mössbauer 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 (Fe3 +/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 (~ 6) a 76% of degradation was obtained. Two reaction products were identified by HPLC: desethyl-atrazine (DEA) and desethyl-desisopropyl-atrazine (DEIA).

KW - Atrazine oxidation

KW - Heterogeneous Fenton

KW - Heterogeneous electro-Fenton

KW - Nanostructured allophane clays supported with iron oxide

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DO - 10.1016/j.clay.2013.10.001

M3 - Article

AN - SCOPUS:84886905365

SN - 0169-1317

VL - 86

SP - 153

EP - 161

JO - Applied Clay Science

JF - Applied Clay Science

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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