Structural modifications in Au/Al<inf>2</inf>O<inf>3</inf>-CeO<inf>2</inf> mixed oxides as a function of Ce<sup>4+</sup> content and its effects in the mineralization of the herbicide diuron

F. Galindo-Hernández, J. A. Wang, R. Gómez, X. Bokhimi, L. Lartundo, A. Mantilla

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Nanocrystalline Au/Al2O3-CeO2 photocatalysts with different CeO2 contents were prepared by the sol-gel method. Gold was deposited by a deposition-precipitation approach. Nitrogen adsorption, X-ray diffraction, Rietveld refinement, radial distribution functions, UV-vis spectroscopy (diffuse reflectance), FT-IR and transmission electron microscopy (TEM) techniques were used for the characterization of the synthesized Au/Al2O3-CeO2 samples. The photodegradation of the herbicide diuron (C9H10Cl 2N2O) in aqueous media using an UV light emission source was used to evaluate the photocatalytic behavior of these nanomaterials. High specific surface areas (326-124 m2/g) and a band gap in the UV region 3.25-3.15 eV were obtained in these solids. XRD patterns showed that Au/Al 2O3-CeO2 mixed oxides contain crystal structures of ceria and γ-alumina. Although, both ceria and γ-alumina are cubic structures, ceria phase is remarkably predominant with respect to the alumina phase. Mineralization of diuron was determined by measuring the total organic carbon (TOC) remaining in the irradiated solution. All the samples, including bare Au/Al2O3 solid, are quite active for the decomposition of the herbicide; however, the analysis of the TOC after 2.5 h in irradiation showed that only photocatalysts containing CeO 2 are capable to reach up to 77% of mineralization of the herbicide. © 2012 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)23-32
Number of pages19
JournalJournal of Photochemistry and Photobiology A: Chemistry
DOIs
StatePublished - 1 Sep 2012

Fingerprint

Diuron
herbicides
diuron
Aluminum Oxide
Herbicides
Cerium compounds
mixed oxides
aluminum oxide
Oxides
herbicide
Alumina
aluminum oxides
oxide
mineralization
Photocatalysts
Organic carbon
total organic carbon
X-ray diffraction
Rietveld refinement
carbon

Cite this

@article{b3cc422c49c14b9e862dfb535d765553,
title = "Structural modifications in Au/Al2O3-CeO2 mixed oxides as a function of Ce4+ content and its effects in the mineralization of the herbicide diuron",
abstract = "Nanocrystalline Au/Al2O3-CeO2 photocatalysts with different CeO2 contents were prepared by the sol-gel method. Gold was deposited by a deposition-precipitation approach. Nitrogen adsorption, X-ray diffraction, Rietveld refinement, radial distribution functions, UV-vis spectroscopy (diffuse reflectance), FT-IR and transmission electron microscopy (TEM) techniques were used for the characterization of the synthesized Au/Al2O3-CeO2 samples. The photodegradation of the herbicide diuron (C9H10Cl 2N2O) in aqueous media using an UV light emission source was used to evaluate the photocatalytic behavior of these nanomaterials. High specific surface areas (326-124 m2/g) and a band gap in the UV region 3.25-3.15 eV were obtained in these solids. XRD patterns showed that Au/Al 2O3-CeO2 mixed oxides contain crystal structures of ceria and γ-alumina. Although, both ceria and γ-alumina are cubic structures, ceria phase is remarkably predominant with respect to the alumina phase. Mineralization of diuron was determined by measuring the total organic carbon (TOC) remaining in the irradiated solution. All the samples, including bare Au/Al2O3 solid, are quite active for the decomposition of the herbicide; however, the analysis of the TOC after 2.5 h in irradiation showed that only photocatalysts containing CeO 2 are capable to reach up to 77{\%} of mineralization of the herbicide. {\circledC} 2012 Elsevier B.V. All rights reserved.",
author = "F. Galindo-Hern{\'a}ndez and Wang, {J. A.} and R. G{\'o}mez and X. Bokhimi and L. Lartundo and A. Mantilla",
year = "2012",
month = "9",
day = "1",
doi = "10.1016/j.jphotochem.2012.06.002",
language = "American English",
pages = "23--32",
journal = "Journal of Photochemistry and Photobiology A: Chemistry",
issn = "1010-6030",
publisher = "Elsevier",

}

TY - JOUR

T1 - Structural modifications in Au/Al2O3-CeO2 mixed oxides as a function of Ce4+ content and its effects in the mineralization of the herbicide diuron

AU - Galindo-Hernández, F.

AU - Wang, J. A.

AU - Gómez, R.

AU - Bokhimi, X.

AU - Lartundo, L.

AU - Mantilla, A.

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Nanocrystalline Au/Al2O3-CeO2 photocatalysts with different CeO2 contents were prepared by the sol-gel method. Gold was deposited by a deposition-precipitation approach. Nitrogen adsorption, X-ray diffraction, Rietveld refinement, radial distribution functions, UV-vis spectroscopy (diffuse reflectance), FT-IR and transmission electron microscopy (TEM) techniques were used for the characterization of the synthesized Au/Al2O3-CeO2 samples. The photodegradation of the herbicide diuron (C9H10Cl 2N2O) in aqueous media using an UV light emission source was used to evaluate the photocatalytic behavior of these nanomaterials. High specific surface areas (326-124 m2/g) and a band gap in the UV region 3.25-3.15 eV were obtained in these solids. XRD patterns showed that Au/Al 2O3-CeO2 mixed oxides contain crystal structures of ceria and γ-alumina. Although, both ceria and γ-alumina are cubic structures, ceria phase is remarkably predominant with respect to the alumina phase. Mineralization of diuron was determined by measuring the total organic carbon (TOC) remaining in the irradiated solution. All the samples, including bare Au/Al2O3 solid, are quite active for the decomposition of the herbicide; however, the analysis of the TOC after 2.5 h in irradiation showed that only photocatalysts containing CeO 2 are capable to reach up to 77% of mineralization of the herbicide. © 2012 Elsevier B.V. All rights reserved.

AB - Nanocrystalline Au/Al2O3-CeO2 photocatalysts with different CeO2 contents were prepared by the sol-gel method. Gold was deposited by a deposition-precipitation approach. Nitrogen adsorption, X-ray diffraction, Rietveld refinement, radial distribution functions, UV-vis spectroscopy (diffuse reflectance), FT-IR and transmission electron microscopy (TEM) techniques were used for the characterization of the synthesized Au/Al2O3-CeO2 samples. The photodegradation of the herbicide diuron (C9H10Cl 2N2O) in aqueous media using an UV light emission source was used to evaluate the photocatalytic behavior of these nanomaterials. High specific surface areas (326-124 m2/g) and a band gap in the UV region 3.25-3.15 eV were obtained in these solids. XRD patterns showed that Au/Al 2O3-CeO2 mixed oxides contain crystal structures of ceria and γ-alumina. Although, both ceria and γ-alumina are cubic structures, ceria phase is remarkably predominant with respect to the alumina phase. Mineralization of diuron was determined by measuring the total organic carbon (TOC) remaining in the irradiated solution. All the samples, including bare Au/Al2O3 solid, are quite active for the decomposition of the herbicide; however, the analysis of the TOC after 2.5 h in irradiation showed that only photocatalysts containing CeO 2 are capable to reach up to 77% of mineralization of the herbicide. © 2012 Elsevier B.V. All rights reserved.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84862994345&origin=inward

UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84862994345&origin=inward

U2 - 10.1016/j.jphotochem.2012.06.002

DO - 10.1016/j.jphotochem.2012.06.002

M3 - Article

SP - 23

EP - 32

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

ER -