Conjoint bioleaching and zinc recovery from an iron oxide mineral residue by a continuous electrodialysis system

2020 ◽  
Vol 195 ◽  
pp. 105409
Author(s):  
Adam J. Williamson ◽  
Karel Folens ◽  
Kylian Van Damme ◽  
Oludotun Olaoye ◽  
Thomas Abo Atia ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Zinc Recovery ◽  
Oxide Mineral

P3-380: Real time analysis of the oxidation and iron oxide mineral formation during in-vitro apoferritin loading

2006 ◽  
Vol 2 ◽  
pp. S487-S487
Author(s):  
Mark R. Davidson ◽  
Joanna F. Collingwood ◽  
Albina Mikhailova ◽  
Jon Dobson ◽  
Christopher Batich
Keyword(s):  
Iron Oxide ◽  
Real Time ◽  
Mineral Formation ◽  
Time Analysis ◽  
Oxide Mineral ◽  
Real Time Analysis

Diffusion mechanisms and reactions during reduction of oolitic iron-oxide mineral

1988 ◽  
Vol 23 (3) ◽  
pp. 1050-1055 ◽  
Author(s):  
S. Nadiv ◽  
S. Weissberger ◽  
I. J. Lin ◽  
Y. Zimmels
Keyword(s):  
Iron Oxide ◽  
Oxide Mineral ◽  
Diffusion Mechanisms

scholarly journals Microbe-Mineral Interaction and Novel Proteins for Iron Oxide Mineral Reduction in the Hyperthermophilic Crenarchaeon Pyrodictium delaneyi

2021 ◽  
Author(s):  
Srishti Kashyap ◽  
James F. Holden
Keyword(s):  
Iron Oxide ◽  
Nitrate Reduction ◽  
Direct Contact ◽  
Iron Reduction ◽  
Hyperthermophilic Archaea ◽  
Respiratory Complex ◽  
Oxide Mineral ◽  
Membrane Bound ◽  
Oxide Minerals ◽  
Geothermal Environments

Dissimilatory iron reduction by hyperthermophilic archaea occurs in many geothermal environments and generally relies on microbe-mineral interactions that transform various iron oxide minerals. In this study, the physiology of dissimilatory iron and nitrate reduction was examined in the hyperthermophilic crenarchaeon Pyrodictium delaneyi Su06T. Iron barrier experiments showed that P. delaneyi required direct contact with the Fe(III) oxide mineral ferrihydrite for reduction. The separate addition of an exogenous electron shuttle (anthraquinone-2,6-disulfonate), a metal chelator (nitrilotriacetic acid), and 75% spent cell-free supernatant did not stimulate growth with or without the barrier. Protein electrophoresis showed that the c-type cytochrome and general protein compositions of P. delaneyi changed when grown on ferrihydrite relative to nitrate. Differential proteomic analyses using tandem mass tagged protein fragments and mass spectrometry detected 660 proteins and differential production of 127 proteins. Among these, two putative membrane-bound molybdopterin-dependent oxidoreductase complexes increased in relative abundance 60- to 3,000-fold and 50-100-fold in cells grown on iron oxide. A putative 8-heme c-type cytochrome was 60-fold more abundant in iron grown cells and was unique to the Pyrodictiaceae. There was also a >14,700-fold increase in a membrane transport protein in iron grown cells. There were no changes in the abundances of flagellin proteins nor a putative nitrate reductase, but a membrane nitric oxide reductase was more abundant on nitrate. These data help to elucidate the mechanisms by which hyperthermophilic crenarchaea generate energy and transfer electrons across the membrane to iron oxide minerals. IMPORTANCE Understanding iron reduction in the hyperthermophilic crenarchaeon Pyrodictium delaneyi provides insight into the diversity of mechanisms used for this process and its potential impact in geothermal environments. The ability of P. delaneyi to reduce Fe(III) oxide minerals through direct contact potentially using a novel cytochrome respiratory complex and a membrane-bound molybdopterin respiratory complex sets iron reduction in this organism apart from previously described iron reduction processes. A model is presented where obligatory H2 oxidation on the membrane coupled with electron transport and either Fe(III) oxide or nitrate reduction leads to the generation of a proton motive force and energy generation by oxidative phosphorylation. However, P. delaneyi cannot fix CO2 and relies on organic compounds from its environment for biosynthesis.

Stable Isotopes and Iron Oxide Mineral Products as Markers of Chemodenitrification.

2015 ◽  
Vol 49 (6) ◽  
pp. 3444-3452 ◽  
Author(s):  
L. Camille Jones ◽  
Brian Peters ◽  
Juan S. Lezama Pacheco ◽  
Karen L. Casciotti ◽  
Scott Fendorf
Keyword(s):  
Stable Isotopes ◽  
Iron Oxide ◽  
Oxide Mineral

Electroacoustic measurements of mixed quartz and iron oxide mineral systems

2012 ◽  
Vol 110-111 ◽  
pp. 12-17 ◽  
Author(s):  
B. Klein ◽  
N.E. Altun ◽  
M. Colebrook ◽  
M. Pawlik
Keyword(s):  
Iron Oxide ◽  
Oxide Mineral

scholarly journals Competitive sorption of microbial metabolites on an iron oxide mineral

2015 ◽  
Vol 90 ◽  
pp. 34-41 ◽  
Author(s):  
Tami L. Swenson ◽  
Benjamin P. Bowen ◽  
Peter S. Nico ◽  
Trent R. Northen
Keyword(s):  
Iron Oxide ◽  
Competitive Sorption ◽  
Microbial Metabolites ◽  
Oxide Mineral

Identification of the Hydrated Iron Oxide Mineral Akaganéite in Apollo 16 Lunar Rocks

Geology ◽  
1974 ◽  
Vol 2 (9) ◽  
pp. 429 ◽  
Author(s):  
Lawrence A. Taylor ◽  
H. K. Mao ◽  
P. M. Bell
Keyword(s):  
Iron Oxide ◽  
Hydrated Iron Oxide ◽  
Oxide Mineral ◽  
Lunar Rocks

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

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