| Spectroscopic investigation of magnetite surface for the reduction of hexavalent chromium. | |
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MedLine Citation:
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PMID: 17400277 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The reduction of Cr(VI) to Cr(III) by magnetite in the presence of added Fe(II) was characterized through batch kinetic experiments and the effect of Fe(II) addition and pH were investigated in this study. The addition of Fe(II) into magnetite suspension improved the reductive capacity of magnetite. Eighty percent of Cr(VI) was reduced by magnetite (6.5 g l(-1)) with Fe(II) (80 mg l(-1)) within 1 h, while 60% of Cr(VI) was removed by magnetite only. However, the extent of improved reductive capacity of magnetite with Fe(II) was less than that predicted by the summation of each reduction capacity of magnetite and Fe(II). The reduction of Cr(VI) in the magnetite suspension with Fe(II) increased with the increase of molar ratio of Fe(II) to Cr(VI) (0.6, 1, 1.5, 2.3) in the range of 0-2.3 and with the decrease of pH in the range of pH 8.0-5.5. The speciation of chromium, iron, and oxygen on the surface of magnetite was investigated by X-ray photoelectron spectroscopy. Cr 2p3/2, Fe 2p3/2, and O 1s peaks were mainly observed at 576.7 and 577.8 eV, at 711.2 eV, and at 530.2 and 531.4 eV, respectively. The results indicates that Cr(III) and Fe(III) were the dominant species on the surface of magnetite after reaction and that the dominant species covered the magnetite surface and formed metal (oxy)hydroxide. |
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Authors:
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Yoojin Jung; Jeongyun Choi; Woojin Lee |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-04-02 |
Journal Detail:
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Title: Chemosphere Volume: 68 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2007 Aug |
Date Detail:
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Created Date: 2007-06-19 Completed Date: 2007-08-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 1968-75 Citation Subset: IM |
Affiliation:
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Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Chromium
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chemistry* Ferrosoferric Oxide / chemistry* Hydrogen-Ion Concentration Iron / chemistry* Oxidation-Reduction Spectrum Analysis |
| Chemical | |
Reg. No./Substance:
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1317-61-9/Ferrosoferric Oxide; 7439-89-6/Iron; 7440-47-3/Chromium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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