Cr(OH)3(s) Oxidation Induced by Surface Catalyzed Mn(II) Oxidation

We examined the feasibility of Cr­(OH)3(s) oxidation mediated by surface catalyzed Mn­(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr­(VI) contaminations. Dissolved Mn­(II) (50 μM) was reacted with or without synthesized Cr­(OH)3(s) (1.0 g/L) at pH 7.0–9.0...

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Published inEnvironmental science & technology Vol. 48; no. 18; pp. 10760 - 10768
Main Authors Namgung, Seonyi, Kwon, Man Jae, Qafoku, Nikolla P, Lee, Giehyeon
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 16.09.2014
American Chemical Society (ACS)
Subjects
anaerobic conditions
Catalysis
Chemical Precipitation
chromium
Chromium - chemistry
Cr(III)
Cr(III) oxidation
Cr(VI) contamination
dissolved oxygen
Environment
environmental hazards
ENVIRONMENTAL SCIENCES
groundwater
manganese
Manganese - chemistry
manganese oxides
Mn(II) oxidation
oxidation
Oxidation-Reduction
remediation
Solutions
surface sorbed Mn
Suspensions
Time Factors
toxicity
X-Ray Absorption Spectroscopy
X-Ray Diffraction
Online AccessGet full text

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Abstract We examined the feasibility of Cr­(OH)3(s) oxidation mediated by surface catalyzed Mn­(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr­(VI) contaminations. Dissolved Mn­(II) (50 μM) was reacted with or without synthesized Cr­(OH)3(s) (1.0 g/L) at pH 7.0–9.0 under oxic or anoxic conditions. Homogeneous Mn­(II) oxidation by dissolved O2 was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn­(II) was completely removed within 8 days and precipitated as hausmannite. When Cr­(OH)3(s) was present, this solid was oxidized and released substantial amounts of Cr­(VI) as dissolved Mn­(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr­(VI) was attributed to Cr­(OH)3(s) oxidation by a newly formed Mn oxide via Mn­(II) oxidation catalyzed on Cr­(OH)3(s) surface. XANES results indicated that this surface-catalyzed Mn­(II) oxidation produced a mixed valence Mn­(III/IV) solid phase. Our results suggest that toxic Cr­(VI) can be naturally produced via Cr­(OH)3(s) oxidation coupled with the oxidation of dissolved Mn­(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr­(OH)3(s), which has been considered the most common and a stable remediation product of Cr­(VI) contamination.
AbstractList We examined the feasibility of Cr(OH)3(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr(VI) contaminations. Dissolved Mn(II) (50 μM) was reacted with or without synthesized Cr(OH)3(s) (1.0 g/L) at pH 7.0-9.0 under oxic or anoxic conditions. Homogeneous Mn(II) oxidation by dissolved O2 was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn(II) was completely removed within 8 days and precipitated as hausmannite. When Cr(OH)3(s) was present, this solid was oxidized and released substantial amounts of Cr(VI) as dissolved Mn(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr(VI) was attributed to Cr(OH)3(s) oxidation by a newly formed Mn oxide via Mn(II) oxidation catalyzed on Cr(OH)3(s) surface. XANES results indicated that this surface-catalyzed Mn(II) oxidation produced a mixed valence Mn(III/IV) solid phase. Our results suggest that toxic Cr(VI) can be naturally produced via Cr(OH)3(s) oxidation coupled with the oxidation of dissolved Mn(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr(OH)3(s), which has been considered the most common and a stable remediation product of Cr(VI) contamination.We examined the feasibility of Cr(OH)3(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr(VI) contaminations. Dissolved Mn(II) (50 μM) was reacted with or without synthesized Cr(OH)3(s) (1.0 g/L) at pH 7.0-9.0 under oxic or anoxic conditions. Homogeneous Mn(II) oxidation by dissolved O2 was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn(II) was completely removed within 8 days and precipitated as hausmannite. When Cr(OH)3(s) was present, this solid was oxidized and released substantial amounts of Cr(VI) as dissolved Mn(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr(VI) was attributed to Cr(OH)3(s) oxidation by a newly formed Mn oxide via Mn(II) oxidation catalyzed on Cr(OH)3(s) surface. XANES results indicated that this surface-catalyzed Mn(II) oxidation produced a mixed valence Mn(III/IV) solid phase. Our results suggest that toxic Cr(VI) can be naturally produced via Cr(OH)3(s) oxidation coupled with the oxidation of dissolved Mn(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr(OH)3(s), which has been considered the most common and a stable remediation product of Cr(VI) contamination.
We examined the feasibility of Cr(OH)₃(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr(VI) contaminations. Dissolved Mn(II) (50 μM) was reacted with or without synthesized Cr(OH)₃(s) (1.0 g/L) at pH 7.0–9.0 under oxic or anoxic conditions. Homogeneous Mn(II) oxidation by dissolved O₂ was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn(II) was completely removed within 8 days and precipitated as hausmannite. When Cr(OH)₃(s) was present, this solid was oxidized and released substantial amounts of Cr(VI) as dissolved Mn(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr(VI) was attributed to Cr(OH)₃(s) oxidation by a newly formed Mn oxide via Mn(II) oxidation catalyzed on Cr(OH)₃(s) surface. XANES results indicated that this surface-catalyzed Mn(II) oxidation produced a mixed valence Mn(III/IV) solid phase. Our results suggest that toxic Cr(VI) can be naturally produced via Cr(OH)₃(s) oxidation coupled with the oxidation of dissolved Mn(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr(OH)₃(s), which has been considered the most common and a stable remediation product of Cr(VI) contamination.
This study examined the feasibility of Cr(OH)₃(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr(VI) contaminations. Dissolved Mn(II) (50 μM) was reacted with or without synthesized Cr(OH)₃(s) (1.0 g/L) at pH 7 – 9 under oxic or anoxic conditions. In the absence of Cr(OH)₃(s), homogeneous Mn(II) oxidation by dissolved O₂ was not observed at pH ≤ 8.0 for 50 d. At pH 9.0, by contrast, dissolved Mn(II) was completely removed within 8 d and precipitated as hausmannite. When Cr(OH)₃(s) was present, this solid was oxidized and released substantial amounts of Cr(VI) as dissolved Mn(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Our results suggest that Cr(OH)₃(s) was readily oxidized by a newly formed Mn oxide as a result of Mn(II) oxidation catalyzed on Cr(OH)₃(s) surface. XANES analysis of the residual solids after the reaction between 1.0 g/L Cr(OH)₃(s) and 204 μM Mn(II) at pH 9.0 for 22 d revealed that the product of surface catalyzed Mn(II) oxidation resembled birnessite. The rate and extent of Cr(OH)₃(s) oxidation was likely controlled by those of surface catalyzed Mn(II) oxidation as the production of Cr(VI) increased with increasing pH and initial Mn(II) concentrations. This study evokes the potential environmental hazard of sparingly soluble Cr(OH)₃(s) that can be a source of Cr(VI) in the presence of dissolved Mn(II).
We examined the feasibility of Cr(OH)3(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr(VI) contaminations. Dissolved Mn(II) (50 μM) was reacted with or without synthesized Cr(OH)3(s) (1.0 g/L) at pH 7.0-9.0 under oxic or anoxic conditions. Homogeneous Mn(II) oxidation by dissolved O2 was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn(II) was completely removed within 8 days and precipitated as hausmannite. When Cr(OH)3(s) was present, this solid was oxidized and released substantial amounts of Cr(VI) as dissolved Mn(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr(VI) was attributed to Cr(OH)3(s) oxidation by a newly formed Mn oxide via Mn(II) oxidation catalyzed on Cr(OH)3(s) surface. XANES results indicated that this surface-catalyzed Mn(II) oxidation produced a mixed valence Mn(III/IV) solid phase. Our results suggest that toxic Cr(VI) can be naturally produced via Cr(OH)3(s) oxidation coupled with the oxidation of dissolved Mn(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr(OH)3(s), which has been considered the most common and a stable remediation product of Cr(VI) contamination.
We examined the feasibility of Cr­(OH)3(s) oxidation mediated by surface catalyzed Mn­(II) oxidation under common groundwater pH conditions as a potential pathway of natural Cr­(VI) contaminations. Dissolved Mn­(II) (50 μM) was reacted with or without synthesized Cr­(OH)3(s) (1.0 g/L) at pH 7.0–9.0 under oxic or anoxic conditions. Homogeneous Mn­(II) oxidation by dissolved O2 was not observed at pH ≤ 8.0 for 50 days. At pH 9.0, by contrast, dissolved Mn­(II) was completely removed within 8 days and precipitated as hausmannite. When Cr­(OH)3(s) was present, this solid was oxidized and released substantial amounts of Cr­(VI) as dissolved Mn­(II) was added into the suspension at pH ≥ 8.0 under oxic conditions. Production of Cr­(VI) was attributed to Cr­(OH)3(s) oxidation by a newly formed Mn oxide via Mn­(II) oxidation catalyzed on Cr­(OH)3(s) surface. XANES results indicated that this surface-catalyzed Mn­(II) oxidation produced a mixed valence Mn­(III/IV) solid phase. Our results suggest that toxic Cr­(VI) can be naturally produced via Cr­(OH)3(s) oxidation coupled with the oxidation of dissolved Mn­(II). In addition, this study evokes the potential environmental hazard of sparingly soluble Cr­(OH)3(s), which has been considered the most common and a stable remediation product of Cr­(VI) contamination.
Author Qafoku, Nikolla P
Lee, Giehyeon
Namgung, Seonyi
Kwon, Man Jae
AuthorAffiliation Department of Earth System Sciences
Yonsei University
Korea Institute of Science and Technology
AuthorAffiliation_xml – name: Department of Earth System Sciences
– name: Korea Institute of Science and Technology
– name: Yonsei University
Author_xml – sequence: 1
  givenname: Seonyi
  surname: Namgung
  fullname: Namgung, Seonyi
  organization: Yonsei University
– sequence: 2
  givenname: Man Jae
  surname: Kwon
  fullname: Kwon, Man Jae
  organization: Korea Institute of Science and Technology
– sequence: 3
  givenname: Nikolla P
  surname: Qafoku
  fullname: Qafoku, Nikolla P
– sequence: 4
  givenname: Giehyeon
  surname: Lee
  fullname: Lee, Giehyeon
  email: ghlee@yonsei.ac.kr
  organization: Yonsei University
BackLink https://www.ncbi.nlm.nih.gov/pubmed/25144300$$D View this record in MEDLINE/PubMed
https://www.osti.gov/biblio/1166857$$D View this record in Osti.gov
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SSID ssj0002308
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Snippet We examined the feasibility of Cr­(OH)3(s) oxidation mediated by surface catalyzed Mn­(II) oxidation under common groundwater pH conditions as a potential...
We examined the feasibility of Cr(OH)3(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential...
We examined the feasibility of Cr(OH)₃(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a potential...
This study examined the feasibility of Cr(OH)₃(s) oxidation mediated by surface catalyzed Mn(II) oxidation under common groundwater pH conditions as a...
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SubjectTerms anaerobic conditions
Catalysis
Chemical Precipitation
chromium
Chromium - chemistry
Cr(III)
Cr(III) oxidation
Cr(VI) contamination
dissolved oxygen
Environment
environmental hazards
ENVIRONMENTAL SCIENCES
groundwater
manganese
Manganese - chemistry
manganese oxides
Mn(II) oxidation
oxidation
Oxidation-Reduction
remediation
Solutions
surface sorbed Mn
Suspensions
Time Factors
toxicity
X-Ray Absorption Spectroscopy
X-Ray Diffraction
Title Cr(OH)3(s) Oxidation Induced by Surface Catalyzed Mn(II) Oxidation
URI http://dx.doi.org/10.1021/es503018u
https://www.ncbi.nlm.nih.gov/pubmed/25144300
https://www.proquest.com/docview/1562661090
https://www.proquest.com/docview/2000226566
https://www.osti.gov/biblio/1166857
Volume 48
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