scholarly journals Crystallization of Fe and Mn Oxides-Hydroxides in Saline and Hypersaline Enviro nments and In vitro

10.5772/59625 ◽  
2015 ◽  
Author(s):  
Nurit Taitel-Goldman
Keyword(s):  
Fe And Mn ◽  
Mn Oxides

Cu, Fe and Mn oxides intercalated SiO2 pillared magadiite and ilerite catalysts for NO decomposition

2021 ◽  
Vol 616 ◽  
pp. 118100
Author(s):  
Narasimharao Katabathini ◽  
Islam Hamdy Abd El Maksod ◽  
Mohamed Mokhtar
Keyword(s):  
No Decomposition ◽  
Fe And Mn ◽  
Mn Oxides

scholarly journals Mechanisms at Different pH for Stabilization of Arsenic in Mine Tailings Using Steelmaking Slag

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 900
Author(s):  
Taehyoung Kim ◽  
Seonhee Kim ◽  
Hyunji Tak ◽  
Kyeongtae Kim ◽  
Chul-Woo Chung ◽  
...  
Keyword(s):  
Mine Tailings ◽  
Steel Slag ◽  
Batch Experiment ◽  
Oxide Content ◽  
Steelmaking Slag ◽  
High Calcium ◽  
Short Period ◽  
Fe And Mn ◽  
Co Precipitation ◽  
Mn Oxides

The mechanisms at different pH for the stabilization of arsenic (As) in mine tailings (MTs) using steelmaking slag were investigated using laboratory experiments. Two types of steelmaking slag were used in the experiments. Ca-slag has high pH and high calcium oxide content due to its short period of aging. In contrast, Fe-slag is oxidized for a long time and is richer in Fe than in Ca. The As-contaminated MTs were taken from a tailing-storage dam around an abandoned gold mine in Korea. The tailings had an average As concentration of 2225.3 mg/kg. The As-removal batch experiment was performed to investigate the As-removal characteristics of the steelmaking slag. From SEM/EDS analyses after each batch experiment, Ca-As bearing precipitates were broadly found on the surface of Ca-slag particles and the final pH of the solution increased to 12.3. However, for Fe-slag, the As was locally found as forms adsorbed to the surface of Fe and Mn oxides contained in the Fe-slag particles. The final pH of this solution was 8.4. The efficiency of removal of As from water using the Ca-slag was >97% and that with Fe-slag was 79%. This suggests that As ions in solution were removed by Ca-(co-)precipitation (which occurs comprehensively on the Ca-slag surface), or by restrictive adsorption of Fe- and Mn-oxides (on limited parts of the Fe-slag). To determine the efficiency of As-extraction reduction from MTs using steel slags, arsenic-extraction batch experiments with two slags were performed under acidic conditions, simulating the leaching environment formed around a mine tailing storage dam. The As concentration in the extracted solution was decreased by 69.9% (even at pH 2) after the addition of 5% Fe-slag. However, when 5% Ca-slag was added, the As concentration decreased by 42.3% at pH 2. These results suggest that Fe-rich steel slag can be more effective than Ca-rich steel slag as a stabilizer for As in contaminated mine tailings at low pH.

A framework for understanding Mo isotope records of Archean and Paleoproterozoic Fe- and Mn-rich sedimentary rocks: Insights from modern marine hydrothermal Fe-Mn oxides

2020 ◽  
Vol 280 ◽  
pp. 221-236
Author(s):  
Kosuke T. Goto ◽  
Yasuhito Sekine ◽  
Gen Shimoda ◽  
James R. Hein ◽  
Shogo Aoki ◽  
...  
Keyword(s):  
Sedimentary Rocks ◽  
Fe And Mn ◽  
Mn Oxides

Predicting Divalent Metal Sorption to Hydrous Al, Fe, and Mn Oxides

2001 ◽  
Vol 35 (9) ◽  
pp. 1779-1784 ◽  
Author(s):  
Paras Trivedi ◽  
Lisa Axe
Keyword(s):  
Divalent Metal ◽  
Metal Sorption ◽  
Fe And Mn ◽  
Mn Oxides

scholarly journals Reductive Dechlorination of Trichloroethylene (TCE) in Competition with Fe and Mn Oxides—Observed Dynamics in H2-dependent Terminal Electron Accepting Processes

2015 ◽  
Vol 33 (5) ◽  
pp. 357-366 ◽  
Author(s):  
Laiby Paul ◽  
Rasmus Jakobsen ◽  
Erik Smolders ◽  
Hans-Jørgen Albrechtsen ◽  
Poul L. Bjerg
Keyword(s):  
Reductive Dechlorination ◽  
Fe And Mn ◽  
Mn Oxides

scholarly journals Monitoring Nutrient Levels during the in Vitro Tuberization of Potato

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 752D-752
Author(s):  
Fouad H. Mohamed ◽  
M.M. Shaaban
Keyword(s):  
Liquid Medium ◽  
In Vitro Tuberization ◽  
Culture Initiation ◽  
Complete Darkness ◽  
Full Size ◽  
Nutrient Levels ◽  
Fe And Mn

Macro- and micronutrient levels were monitored during the in vitro tuberization of potato (cv. Alpha) in liquid medium of MS salts and vitamins supplemented with 8% sucrose and 5 mg·liter–1 kinetin under complete darkness at 18C. Microtubers were formed in 50% of the cultured jars at day 20 and reached their full size at day 60 of culture initiation. By this time, medium N, P, and K levels had dropped by 89%, 84%, and 41%, respectively. The major drop in medium N occurred during the pre-tuberization stage, when it was taken up mostly by shoots. During tuber enlargement, the rate of Zn, Fe, and Mn removal from medium was slower than their rate of uptake by tubers. The changes in shoot and tuber Ca were very small where most of the Ca removed from medium was diverted into the roots.

Fabrication and characterization of KGM-based FMBO-containing aerogels for removal of arsenite in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41877-41886 ◽  
Author(s):  
Shuxin Ye ◽  
Weiping Jin ◽  
Qing Huang ◽  
Ying Hu ◽  
Bakht Ramin Shah ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Materials ◽  
Konjac Glucomannan ◽  
Fe And Mn ◽  
Fabrication And Characterization ◽  
Mn Oxides

Hybrid materials were obtained by immobilizing Fe and Mn oxides (FMBO) into a konjac glucomannan (KGM) based aerogel matrix to remove arsenite from water.

Preliminary observations on the release of arsenic to groundwater in the presence of hydrocarbon contaminants in UK aquifers

2005 ◽  
Vol 69 (5) ◽  
pp. 887-896 ◽  
Author(s):  
W. G. Burgess ◽  
L. Pinto
Keyword(s):  
Solid Phase ◽  
Electron Acceptors ◽  
Arsenic Mobilization ◽  
Reducing Conditions ◽  
Soils And Sediments ◽  
Hydraulic Conditions ◽  
Fe And Mn ◽  
Bicarbonate Alkalinity ◽  
Mn Oxides ◽  
Triassic Sandstone

AbstractDegradation of contaminant hydrocarbons in groundwater by microbially mediated oxidation, linked to the reduction of electron acceptors, is fundamental to the strategy of ‘monitored natural attenuation’ (MNA) for oxidizable hydrocarbons, which is increasingly being adopted at polluted aquifer sites throughout Europe and North America. Commonly, oxygen is depleted and following the reduction of nitrate, solid-phase Fe oxides become the dominant electron acceptors. Arsenic, associated with Fe and Mn oxides in soils and sediments, may therefore be mobilized to groundwater and pose an additional threat to environmental receptors. In a pilot study of three aquifers in England, we have examined the extent to which arsenic is released to groundwater under Fe(III)-reducing conditions imposed by contaminant hydrocarbons. Results show that arsenic is locally mobilized in the Chalk to <10 μg/1, in Quaternary gravels to 70 μg/1 and in the Triassic sandstones to 160 μg/1. At the Chalk and Quaternary gravels sites arsenic mobilization is demonstrably linked to reduction of Fe- and Mn-oxides. This is not so at the Triassic sandstone site, where release of arsenic is related to elevated bicarbonate alkalinity. Redox-driven arsenic mobilization at other Triassic sandstone locations is possible. Further work is required on the solid-phase sources of arsenic in the aquifers, and to relate the hydrochemical observations to groundwater hydraulic conditions.

Microbially-induced Fe and Mn oxides in condensed pelagic sediments (Middle-Upper Jurassic, Western Sicily)

2011 ◽  
Vol 237 (3-4) ◽  
pp. 179-188 ◽  
Author(s):  
A. Préat ◽  
B. Mamet ◽  
P. Di Stefano ◽  
L. Martire ◽  
K. Kolo
Keyword(s):  
Upper Jurassic ◽  
Fe And Mn ◽  
Western Sicily ◽  
Mn Oxides

Hydrous FE and MN oxides — scavengers of heavy metals in the aquatic environment

1984 ◽  
Vol 14 (1) ◽  
pp. 33-90 ◽  
Author(s):  
Shailendra K. Singh ◽  
V. Subramanian ◽  
Ronald J. Gibbs
Keyword(s):  
Heavy Metals ◽  
Aquatic Environment ◽  
Fe And Mn ◽  
Mn Oxides
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