Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Imme Kretschmer
  • Alejandro M. Senn
  • J. Martín Meichtry
  • Graciela Custo
  • Emilia B. Halac
  • Ralf Dillert
  • Detlef Bahnemann
  • Marta I. Litter

Organisationseinheiten

Externe Organisationen

  • CONICET
  • Universidad Nacional de San Martin
  • Staatliche Universität Sankt Petersburg
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Details

OriginalspracheEnglisch
Seiten (von - bis)218-226
Seitenumfang9
FachzeitschriftApplied Catalysis B: Environmental
Jahrgang242
Frühes Online-Datum22 Sept. 2018
PublikationsstatusVeröffentlicht - März 2019

Abstract

Hematite nanoparticles (nHm) were tested for Cr(VI) photocatalytic reduction (300 μM) in the presence of different electron donors such as citrate (Cit), oxalate (Ox), 2-propanol and methanol. At pH 3 and under irradiation at λ ≥ 310 nm, almost negligible reaction took place in the absence of donor or with the alcohols, while the reduction was very rapid in the presence of Cit (less than 25 min), and faster with Ox (15 min). Homogeneous experiments with FeCl 3 instead of nHm showed a complete Cr(VI) reduction in the presence of both complexing agents in less than 10 min. Under irradiation at λ > 495 nm and with nHm at pH 3, a good Cr(VI) transformation took place with both donors, but at a considerably lower rate than under UV light (around 100% at 180 min), the decay being negligible in the homogeneous systems with Fe(III). Under irradiation at λ > 610 nm, no Cr(VI) transformation took place over nHm. Experiments at pH 6 under UV–Vis light with Cit in the presence of nHm gave a good Cr(VI) decay, faster with Fe(III) (60% and 90% in 105 min, respectively); some Cr(VI) transformation (around 35% in 180 min) was found with Cit under Vis light. Interestingly, at both wavelength ranges, the reaction was negligible when Ox was used. Mechanisms taking place under the different conditions were proposed, including the role of surface charge transfer complexes on nHm.

ASJC Scopus Sachgebiete

Zitieren

Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate. / Kretschmer, Imme; Senn, Alejandro M.; Meichtry, J. Martín et al.
in: Applied Catalysis B: Environmental, Jahrgang 242, 03.2019, S. 218-226.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Kretschmer, I, Senn, AM, Meichtry, JM, Custo, G, Halac, EB, Dillert, R, Bahnemann, D & Litter, MI 2019, 'Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate', Applied Catalysis B: Environmental, Jg. 242, S. 218-226. https://doi.org/10.1016/j.apcatb.2018.09.059
Kretschmer, I., Senn, A. M., Meichtry, J. M., Custo, G., Halac, E. B., Dillert, R., Bahnemann, D., & Litter, M. I. (2019). Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate. Applied Catalysis B: Environmental, 242, 218-226. https://doi.org/10.1016/j.apcatb.2018.09.059
Kretschmer I, Senn AM, Meichtry JM, Custo G, Halac EB, Dillert R et al. Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate. Applied Catalysis B: Environmental. 2019 Mär;242:218-226. Epub 2018 Sep 22. doi: 10.1016/j.apcatb.2018.09.059
Kretschmer, Imme ; Senn, Alejandro M. ; Meichtry, J. Martín et al. / Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate. in: Applied Catalysis B: Environmental. 2019 ; Jahrgang 242. S. 218-226.
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title = "Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate",
abstract = "Hematite nanoparticles (nHm) were tested for Cr(VI) photocatalytic reduction (300 μM) in the presence of different electron donors such as citrate (Cit), oxalate (Ox), 2-propanol and methanol. At pH 3 and under irradiation at λ ≥ 310 nm, almost negligible reaction took place in the absence of donor or with the alcohols, while the reduction was very rapid in the presence of Cit (less than 25 min), and faster with Ox (15 min). Homogeneous experiments with FeCl 3 instead of nHm showed a complete Cr(VI) reduction in the presence of both complexing agents in less than 10 min. Under irradiation at λ > 495 nm and with nHm at pH 3, a good Cr(VI) transformation took place with both donors, but at a considerably lower rate than under UV light (around 100% at 180 min), the decay being negligible in the homogeneous systems with Fe(III). Under irradiation at λ > 610 nm, no Cr(VI) transformation took place over nHm. Experiments at pH 6 under UV–Vis light with Cit in the presence of nHm gave a good Cr(VI) decay, faster with Fe(III) (60% and 90% in 105 min, respectively); some Cr(VI) transformation (around 35% in 180 min) was found with Cit under Vis light. Interestingly, at both wavelength ranges, the reaction was negligible when Ox was used. Mechanisms taking place under the different conditions were proposed, including the role of surface charge transfer complexes on nHm. ",
keywords = "Citrate, Cr(VI), Nanohematite, Oxalate, Photocatalysis",
author = "Imme Kretschmer and Senn, {Alejandro M.} and Meichtry, {J. Mart{\'i}n} and Graciela Custo and Halac, {Emilia B.} and Ralf Dillert and Detlef Bahnemann and Litter, {Marta I.}",
note = "Funding information: This work was partially supported by Agencia Nacional de Promoci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica of Argentina , PICT-0463 and PICT-208 grants and by the Scientific and Technological Cooperation Argentina-Germany BMBF/MINCYT ARG 07/005 .",
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TY - JOUR

T1 - Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate

AU - Kretschmer, Imme

AU - Senn, Alejandro M.

AU - Meichtry, J. Martín

AU - Custo, Graciela

AU - Halac, Emilia B.

AU - Dillert, Ralf

AU - Bahnemann, Detlef

AU - Litter, Marta I.

N1 - Funding information: This work was partially supported by Agencia Nacional de Promoción Científica y Tecnológica of Argentina , PICT-0463 and PICT-208 grants and by the Scientific and Technological Cooperation Argentina-Germany BMBF/MINCYT ARG 07/005 .

PY - 2019/3

Y1 - 2019/3

N2 - Hematite nanoparticles (nHm) were tested for Cr(VI) photocatalytic reduction (300 μM) in the presence of different electron donors such as citrate (Cit), oxalate (Ox), 2-propanol and methanol. At pH 3 and under irradiation at λ ≥ 310 nm, almost negligible reaction took place in the absence of donor or with the alcohols, while the reduction was very rapid in the presence of Cit (less than 25 min), and faster with Ox (15 min). Homogeneous experiments with FeCl 3 instead of nHm showed a complete Cr(VI) reduction in the presence of both complexing agents in less than 10 min. Under irradiation at λ > 495 nm and with nHm at pH 3, a good Cr(VI) transformation took place with both donors, but at a considerably lower rate than under UV light (around 100% at 180 min), the decay being negligible in the homogeneous systems with Fe(III). Under irradiation at λ > 610 nm, no Cr(VI) transformation took place over nHm. Experiments at pH 6 under UV–Vis light with Cit in the presence of nHm gave a good Cr(VI) decay, faster with Fe(III) (60% and 90% in 105 min, respectively); some Cr(VI) transformation (around 35% in 180 min) was found with Cit under Vis light. Interestingly, at both wavelength ranges, the reaction was negligible when Ox was used. Mechanisms taking place under the different conditions were proposed, including the role of surface charge transfer complexes on nHm.

AB - Hematite nanoparticles (nHm) were tested for Cr(VI) photocatalytic reduction (300 μM) in the presence of different electron donors such as citrate (Cit), oxalate (Ox), 2-propanol and methanol. At pH 3 and under irradiation at λ ≥ 310 nm, almost negligible reaction took place in the absence of donor or with the alcohols, while the reduction was very rapid in the presence of Cit (less than 25 min), and faster with Ox (15 min). Homogeneous experiments with FeCl 3 instead of nHm showed a complete Cr(VI) reduction in the presence of both complexing agents in less than 10 min. Under irradiation at λ > 495 nm and with nHm at pH 3, a good Cr(VI) transformation took place with both donors, but at a considerably lower rate than under UV light (around 100% at 180 min), the decay being negligible in the homogeneous systems with Fe(III). Under irradiation at λ > 610 nm, no Cr(VI) transformation took place over nHm. Experiments at pH 6 under UV–Vis light with Cit in the presence of nHm gave a good Cr(VI) decay, faster with Fe(III) (60% and 90% in 105 min, respectively); some Cr(VI) transformation (around 35% in 180 min) was found with Cit under Vis light. Interestingly, at both wavelength ranges, the reaction was negligible when Ox was used. Mechanisms taking place under the different conditions were proposed, including the role of surface charge transfer complexes on nHm.

KW - Citrate

KW - Cr(VI)

KW - Nanohematite

KW - Oxalate

KW - Photocatalysis

UR - http://www.scopus.com/inward/record.url?scp=85054460575&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2018.09.059

DO - 10.1016/j.apcatb.2018.09.059

M3 - Article

VL - 242

SP - 218

EP - 226

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

ER -