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Effect of biogenic iron species and copper ions on the reduction of carbon tetrachloride under iron-reducing conditions.

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.chemosphere.2007.09.021 Byline: R.A. Maithreepala (a), Ruey-an Doong (b) Keywords: Carbon tetrachloride (CCl.sub.4); Iron-reducing conditions; Geobacter sulfurreducens; Copper ions (Cu(II)); Surface-bound iron... Full description

Journal Title: Chemosphere February 2008, Vol.70(8), pp.1405-1413
Main Author: Maithreepala, R A
Other Authors: Doong, Ruey-An
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0045-6535
Link: http://search.proquest.com/docview/70202859/?pq-origsite=primo
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title: Effect of biogenic iron species and copper ions on the reduction of carbon tetrachloride under iron-reducing conditions.
format: Article
creator:
  • Maithreepala, R A
  • Doong, Ruey-An
subjects:
  • Biotransformation–Drug Effects
  • Carbon Tetrachloride–Chemistry
  • Copper–Metabolism
  • Ferric Compounds–Chemistry
  • Geobacter–Pharmacology
  • Iron–Chemistry
  • Microscopy, Electron, Scanning–Metabolism
  • Oxidation-Reduction–Drug Effects
  • Oxidation-Reduction–Metabolism
  • Oxidation-Reduction–Ultrastructure
  • Oxidation-Reduction–Chemistry
  • Oxidation-Reduction–Pharmacology
  • Oxidation-Reduction–Drug Effects
  • Ferric Compounds
  • Copper
  • Carbon Tetrachloride
  • Iron
ispartof: Chemosphere, February 2008, Vol.70(8), pp.1405-1413
description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.chemosphere.2007.09.021 Byline: R.A. Maithreepala (a), Ruey-an Doong (b) Keywords: Carbon tetrachloride (CCl.sub.4); Iron-reducing conditions; Geobacter sulfurreducens; Copper ions (Cu(II)); Surface-bound iron species Abstract: In this study, the cell-mediated and abiotic reduction of carbon tetrachloride (CCl.sub.4) by biogenic iron species produced from the reductive dissolution of ferrihydrite in the presence of Geobacter sulfurreducens and copper ions (Cu(II)) were investigated. 9,10-Anthraquinone-2,6-disulfonate (AQDS), serving as a surrogate of natural organic matters and an electron shuttling compound, was added to enhance the efficiency of biological reduction of the solid Fe(III) minerals. G. sulfurreducens drove the reduction of CCl.sub.4, primarily through the formation of biogenic surface-bound iron species produced from the reductive dissolution of ferrihydrite, in the presence of 10[mu]M AQDS. The pseudo-first-order rate constant (k.sub.obsCT) for CCl.sub.4 transformation in the presence of ferrihydrite was 3.0 times higher than that resulting from the use of G. sulfurreducens alone. Addition of 0.5mM Cu(II) slightly inhibited both the growth of G. sulfurreducens and the production of biogenic Fe(II). However, the k.sub.obsCT values for CCl.sub.4 transformation in ferrihydrite suspensions containing G. sulfurreducens and 0.3-0.5mM Cu(II) were 2.1-4.2 times higher than that observed in the absence of Cu(II). X-Ray powder diffraction analysis indicated that the added Cu(II) reacted with the biogenic Fe(II) ions to produce catalytic cuprous ions (Cu(I)) and secondary iron oxide minerals such as magnetite and goethite, resulting in accelerating the chemical transformation efficiency and rate of CCl.sub.4 under iron-reducing conditions. Author Affiliation: (a) Department of Limnology, Faculty of Fisheries, Marine Science and Technologies (FMST), University of Ruhuna, Sri Lanka (b) Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Sec. 2, Kuang Fu Road, Hsinchu 30013, Taiwan Article History: Received 24 April 2007; Revised 12 September 2007; Accepted 12 September 2007
language: eng
source:
identifier: ISSN: 0045-6535
fulltext: no_fulltext
issn:
  • 00456535
  • 0045-6535
url: Link


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titleEffect of biogenic iron species and copper ions on the reduction of carbon tetrachloride under iron-reducing conditions.
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subjectBiotransformation–Drug Effects ; Carbon Tetrachloride–Chemistry ; Copper–Metabolism ; Ferric Compounds–Chemistry ; Geobacter–Pharmacology ; Iron–Chemistry ; Microscopy, Electron, Scanning–Metabolism ; Oxidation-Reduction–Drug Effects ; Oxidation-Reduction–Metabolism ; Oxidation-Reduction–Ultrastructure ; Oxidation-Reduction–Chemistry ; Oxidation-Reduction–Pharmacology ; Oxidation-Reduction–Drug Effects ; Ferric Compounds ; Copper ; Carbon Tetrachloride ; Iron
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descriptionTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.chemosphere.2007.09.021 Byline: R.A. Maithreepala (a), Ruey-an Doong (b) Keywords: Carbon tetrachloride (CCl.sub.4); Iron-reducing conditions; Geobacter sulfurreducens; Copper ions (Cu(II)); Surface-bound iron species Abstract: In this study, the cell-mediated and abiotic reduction of carbon tetrachloride (CCl.sub.4) by biogenic iron species produced from the reductive dissolution of ferrihydrite in the presence of Geobacter sulfurreducens and copper ions (Cu(II)) were investigated. 9,10-Anthraquinone-2,6-disulfonate (AQDS), serving as a surrogate of natural organic matters and an electron shuttling compound, was added to enhance the efficiency of biological reduction of the solid Fe(III) minerals. G. sulfurreducens drove the reduction of CCl.sub.4, primarily through the formation of biogenic surface-bound iron species produced from the reductive dissolution of ferrihydrite, in the presence of 10[mu]M AQDS. The pseudo-first-order rate constant (k.sub.obsCT) for CCl.sub.4 transformation in the presence of ferrihydrite was 3.0 times higher than that resulting from the use of G. sulfurreducens alone. Addition of 0.5mM Cu(II) slightly inhibited both the growth of G. sulfurreducens and the production of biogenic Fe(II). However, the k.sub.obsCT values for CCl.sub.4 transformation in ferrihydrite suspensions containing G. sulfurreducens and 0.3-0.5mM Cu(II) were 2.1-4.2 times higher than that observed in the absence of Cu(II). X-Ray powder diffraction analysis indicated that the added Cu(II) reacted with the biogenic Fe(II) ions to produce catalytic cuprous ions (Cu(I)) and secondary iron oxide minerals such as magnetite and goethite, resulting in accelerating the chemical transformation efficiency and rate of CCl.sub.4 under iron-reducing conditions. Author Affiliation: (a) Department of Limnology, Faculty of Fisheries, Marine Science and Technologies (FMST), University of Ruhuna, Sri Lanka (b) Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101, Sec. 2, Kuang Fu Road, Hsinchu 30013, Taiwan Article History: Received 24 April 2007; Revised 12 September 2007; Accepted 12 September 2007
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