Manganese oxide accumulations associated with some soil structural pores .II. Composite coatings and translocation

Soil Research ◽  
1993 ◽  
Vol 31 (3) ◽  
pp. 227 ◽  
Author(s):  
LA Sullivan ◽  
AJ Koppi
Keyword(s):  
Manganese Oxide ◽  
Manganese Oxides ◽  
Composite Coatings ◽  
Analytical Techniques ◽  
Detailed Examination ◽  
Oxide Coatings ◽  
Soil Matrix ◽  
Soil Material ◽  
Soil Components ◽  
Typic Pellustert

The morphology and composition of some composite coatings-containing manganese oxide coatings and impregnations-that were associated with the structural pores in a black earth (Typic Pellustert) subsoil layer were examined using light microscopy, electron microscopy, and electron micro-analytical techniques. Detailed examination of composite coatings indicates, firstly, that subsurface coatings and impregnations of manganese oxides had been formed by the burial of surface accumulations of manganese oxides with coatings of other soil components, and secondly, that fine-textured soil material had been translocated and deposited in a form which was virtually indistinguishable from that of the soil matrix.

Manganese oxide accumulations associated with some soil structural pores .I. Morphology, composition and genesis

Soil Research ◽  
1992 ◽  
Vol 30 (4) ◽  
pp. 409 ◽  
Author(s):  
LA Sullivan ◽  
AJ Koppi
Keyword(s):  
Manganese Oxide ◽  
Analytical Techniques ◽  
Oxide Phase ◽  
Significant Negative Correlation ◽  
X Ray Diffraction ◽  
Microbial Oxidation ◽  
X Ray ◽  
Positive Correlations ◽  
Typic Pellustert ◽  
Iron And Manganese

The morphology and composition of manganese oxide accumulations associated with the structural pores in a black earth (Typic Pellustert) subsoil layer were examined using light microscopy, electron microscopy, X-ray diffraction and electron micro-analytical techniques. Birnessite was identified as the crystalline manganese oxide phase. There were significant positive correlations between cobalt, calcium and manganese and a significant negative correlation between iron and manganese. It was most probable that both microbial oxidation and auto-oxidation of Mn2+ contributed to the formation of the manganese oxide accumulations in this soil.

Photoelectrochemical OER activity by employing BiVO4 with manganese oxide co-catalysts

2020 ◽  
Vol 22 (2) ◽  
pp. 811-817 ◽  
Author(s):  
Manjodh Kaur ◽  
Manjeet Chhetri ◽  
C. N. R. Rao
Keyword(s):  
Manganese Oxide ◽  
Water Splitting ◽  
Manganese Oxides ◽  
Photoelectrochemical Water Splitting ◽  
Co Catalysts ◽  
Natural Photosynthesis

Inspired by natural photosynthesis, various manganese oxides have been studied as co-catalysts with BiVO4 for photoelectrochemical water splitting.

scholarly journals Biohybrid nanofibers containing manganese oxide–forming fungi for heavy metal removal from water

2020 ◽  
Vol 15 ◽  
pp. 155892501989895
Author(s):  
Yaewon Park ◽  
Shuang Liu ◽  
Terrence Gardner ◽  
Drake Johnson ◽  
Aaron Keeler ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Heavy Metal Ions ◽  
Manganese Oxides ◽  
Metal Removal ◽  
Strong Association ◽  
Heavy Metal Removal ◽  
Fungal Hyphae ◽  
Farm Unit

Manganese-oxidizing fungi support bioremediation through the conversion of manganese ions into manganese oxide deposits that in turn adsorb manganese and other heavy metal ions from the environment. Manganese-oxidizing fungi were immobilized onto nanofiber surfaces to assist remediation of heavy metal–contaminated water. Two fungal isolates, Coniothyrium sp. and Coprinellus sp., from a Superfund site (Lot 86, Farm Unit #1) water treatment system were incubated in the presence of nanofibers. Fungal hyphae had strong association with nanofiber surfaces. Upon fungal attachment to manganese chloride–seeded nanofibers, Coniothyrium sp. catalyzed the conformal deposition of manganese oxide along hyphae and nanofibers, but Coprinellus sp. catalyzed manganese oxide only along its hyphae. Fungi–nanofiber hybrids removed various heavy metals from the water. Heavy metal ions were adsorbed into manganese oxide crystalline structure, possibly by ion exchange with manganese within the manganese oxide. Hybrid materials of fungal hyphae and manganese oxides confined to nanofiber-adsorbed heavy metal ions from water.

Synthesis and Application of Manganese Oxide Based Nanomaterials

2013 ◽  
Vol 830 ◽  
pp. 33-36
Author(s):  
Su Jun Li
Keyword(s):  
Water Treatment ◽  
Manganese Oxide ◽  
Anode Materials ◽  
Manganese Oxides ◽  
Low Cost ◽  
Lithium Ion ◽  
Inorganic Materials ◽  
Structural Flexibility ◽  
Electrochemical Supercapacitors ◽  
High Theoretical Capacity

Manganese oxide is one of the most attractive inorganic materials because of its structural flexibility and wide applications in catalysis, ion exchange, electrochemical supercapacitors, molecular adsorption, biosensors, and so on. In recently, manganese oxides nanomaterials, including MnO, MnO2and Mn3O4, have attracted great interest as anode materials in lithium-ion batteries and water treatment due to their high theoretical capacity, environmental benignity, low cost, and special properties. Hence, manganese oxides nanostructures with excellent properties and various morphologies have been successfully synthesized. Herein, we provide a recent development of the synthesis of manganese oxides nanomaterials and their application.

Soil amendments reduce P release from flooded soils: Incubation studies simulating snowmelt and summer flooding

2020 ◽  
Author(s):  
Chammi Attanayake ◽  
Darshani Kumaragamage ◽  
Chamara Weerasekara ◽  
Udaya Vitharana ◽  
Saman Dharmakeerthi ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Ferric Chloride ◽  
Magnesium Sulphate ◽  
Manganese Oxides ◽  
Soil Amendments ◽  
Early Summer ◽  
Flooded Soils ◽  
Ongoing Research ◽  
Soil P ◽  
P Release

<p>Flooding caused by snowmelt runoff in the spring and early summer and heavy rainfall in the summer could enhance P release into nearby surface water bodies causing eutrophication. Six soil amendments were tested for their effectiveness  in reducing P release from flooded-soils. Soils were collected from the flood-prone fields in the Red River Valley region in Manitoba, Canada. The tested amendments were gypsum, magnesium sulphate, alum, ferric chloride, zeolite and manganese oxides. Intact soil columns were subjected to flooding for 8 weeks at 4<sup>o</sup>C simulating the snowmelt in the spring and the early summer and at 22<sup>o</sup>C simulating flooding occurrences in the summer.  Release of soil P into soil solution and floodwater was higher at 22<sup>o</sup>C than that at 4<sup>o</sup>C. Gypsum, magnesium sulphate, alum and ferric chloride were effective in reducing the concentrations of P in the pore- and flood-water at various capacities. Ongoing research on zeolite and manganese oxide suggests that manganese oxide was more effective in reducing soluble P concentrations in soils at early days of flooding.</p>

Effect of Doping Metal Ions on the Structure Transformation of Octahedral Layer Structure Manganese Oxide

2015 ◽  
Vol 723 ◽  
pp. 670-673
Author(s):  
Chen Liang Zhou ◽  
Bin Zheng Fang ◽  
Jian Wei Cao ◽  
Na Zhang ◽  
Jia Li Han ◽  
...  
Keyword(s):  
Metal Ions ◽  
Manganese Oxide ◽  
Powder Diffraction ◽  
Redox Reactions ◽  
Manganese Oxides ◽  
Layer Structure ◽  
Structure Transformation ◽  
Octahedral Layer ◽  
X Ray ◽  
Before And After

The Octahedral layer structure manganese oxides (Buserite and Birnessite) have been synthesized and modified by aging a MnOx gel which was produced from the redox reactions between Mn2+ and MnO4- in the presence of other metal cations (Mg2+, Ni2+, Co2+ or Cu2+). The present study investigates the structure transformation between Buserite and Birnessite using X-ray powder diffraction conducted on cation doped manganese oxides at different stages of before and after hydration. The results indicate that introduction of Mg2+ into the interlayer can completely achieve the structure transformation between Birnessite and Buserite after hydrated at 24h, and Ni2+ can partially reverse.

Controlled formation of uniform nanoshells of manganese oxide and their potential in lithium ion batteries

2017 ◽  
Vol 53 (19) ◽  
pp. 2846-2849 ◽  
Author(s):  
Xiao-Chan Liu ◽  
Jun-Yu Piao ◽  
De-Shan Bin ◽  
Tian-Qi Zhang ◽  
Shu-Yi Duan ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Lithium Ion Batteries ◽  
Growth Kinetics ◽  
Manganese Oxides ◽  
Lithium Ion

Uniform nanoshells of manganese oxides have been successfully prepared by controlling their growth kinetics in solution.

scholarly journals Cross dehydrogenative coupling of N-aryltetrahydroisoquinolines (sp3 C–H) with indoles (sp2 C–H) using a heterogeneous mesoporous manganese oxide catalyst

2017 ◽  
Vol 19 (22) ◽  
pp. 5350-5355 ◽  
Author(s):  
B. Dutta ◽  
V. Sharma ◽  
N. Sassu ◽  
Y. Dang ◽  
C. Weerakkody ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Manganese Oxides ◽  
Oxide Catalyst ◽  
Heterogeneous Catalytic ◽  
Dehydrogenative Coupling ◽  
Manganese Oxide Catalyst

We disclose a novel, heterogeneous catalytic approach for selective coupling of C1 of N-aryltetrahydroisoquinolines with C3 of indoles in the presence of mesoporous manganese oxides.

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