Dehydrochlorination of 1,1,1-trichloroethane and pentachloroethane by microbially reduced ferruginous smectite

2003 ◽  
Vol 22 (5) ◽  
pp. 1046-1050 ◽  
Author(s):  
Javiera Cervini-Silva ◽  
Joel E. Kostka ◽  
Richard A. Larson ◽  
Joseph W. Stucki ◽  
Jun Wu
Keyword(s):  
Ferruginous Smectite

scholarly journals Growth of Thermophilic and Hyperthermophilic Fe(III)-Reducing Microorganisms on a Ferruginous Smectite as the Sole Electron Acceptor

2007 ◽  
Vol 74 (1) ◽  
pp. 251-258 ◽  
Author(s):  
Kazem Kashefi ◽  
Evgenya S. Shelobolina ◽  
W. Crawford Elliott ◽  
Derek R. Lovley
Keyword(s):  
Electron Acceptor ◽  
Major Element ◽  
Solid Phase ◽  
Active Role ◽  
Sedimentary Environments ◽  
Major Element Chemistry ◽  
Wide Range ◽  
Structural Iron ◽  
Ferruginous Smectite ◽  
Freshwater Environments

ABSTRACT Recent studies have suggested that the structural Fe(III) within phyllosilicate minerals, including smectite and illite, is an important electron acceptor for Fe(III)-reducing microorganisms in sedimentary environments at moderate temperatures. The reduction of structural Fe(III) by thermophiles, however, has not previously been described. A wide range of thermophilic and hyperthermophilic Archaea and Bacteria from marine and freshwater environments that are known to reduce poorly crystalline Fe(III) oxides were tested for their ability to reduce structural (octahedrally coordinated) Fe(III) in smectite (SWa-1) as the sole electron acceptor. Two out of the 10 organisms tested, Geoglobus ahangari and Geothermobacterium ferrireducens, were not able to conserve energy to support growth by reduction of Fe(III) in SWa-1 despite the fact that both organisms were originally isolated with solid-phase Fe(III) as the electron acceptor. The other organisms tested were able to grow on SWa-1 and reduced 6.3 to 15.1% of the Fe(III). This is 20 to 50% less than the reported amounts of Fe(III) reduced in the same smectite (SWa-1) by mesophilic Fe(III) reducers. Two organisms, Geothermobacter ehrlichii and archaeal strain 140, produced copious amounts of an exopolysaccharide material, which may have played an active role in the dissolution of the structural iron in SWa-1 smectite. The reduction of structural Fe(III) in SWa-1 by archaeal strain 140 was studied in detail. Microbial Fe(III) reduction was accompanied by an increase in interlayer and octahedral charges and some incorporation of potassium and magnesium into the smectite structure. However, these changes in the major element chemistry of SWa-1 smectite did not result in the formation of an illite-like structure, as reported for a mesophilic Fe(III) reducer. These results suggest that thermophilic Fe(III)-reducing organisms differ in their ability to reduce and solubilize structural Fe(III) in SWa-1 smectite and that SWa-1 is not easily transformed to illite by these organisms.

Alteration of Mammalian-Cell Toxicity of Pesticides by Structural Iron(II) in Ferruginous Smectite

2004 ◽  
Vol 38 (16) ◽  
pp. 4383-4389 ◽  
Author(s):  
Kara C. Sorensen ◽  
Joseph W. Stucki ◽  
Richard E. Warner ◽  
Michael J. Plewa
Keyword(s):  
Mammalian Cell ◽  
Cell Toxicity ◽  
Structural Iron ◽  
Ferruginous Smectite ◽  
Mammalian Cell Toxicity

Transformation of chlorinated aliphatic compounds by ferruginous smectite

2003 ◽  
pp. 241-246
Author(s):  
Javiera Cervini-Silva ◽  
Richard A. Larson ◽  
Jun Wu ◽  
Joseph W. Stucki
Keyword(s):  
Aliphatic Compounds ◽  
Ferruginous Smectite

Infrared study of reduced and reduced-reoxidized ferruginous smectite

2002 ◽  
Vol 50 (4) ◽  
pp. 455-469 ◽  
Author(s):  
Claire-Isabelle Fialips ◽  
Dongfang Huo ◽  
Laibin Yan ◽  
Jun Wu ◽  
Joseph W. Stucki
Keyword(s):  
Infrared Study ◽  
Ferruginous Smectite

Dechlorination of pentachloroethane by commercial Fe and ferruginous smectite

Chemosphere ◽  
2002 ◽  
Vol 47 (9) ◽  
pp. 971-976 ◽  
Author(s):  
Javiera Cervini-Silva ◽  
Richard A. Larson ◽  
Jun Wu ◽  
Joseph W. Stucki
Keyword(s):  
Ferruginous Smectite

scholarly journals Tc(VII) and Cr(VI) Interaction with Naturally Reduced Ferruginous Smectite from a Redox Transition Zone

2017 ◽  
Vol 51 (16) ◽  
pp. 9042-9052 ◽  
Author(s):  
Odeta Qafoku ◽  
Carolyn I. Pearce ◽  
Anke Neumann ◽  
Libor Kovarik ◽  
Mengqiang Zhu ◽  
...  
Keyword(s):  
Transition Zone ◽  
Redox Transition ◽  
Ferruginous Smectite
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