Bibliografie tematiche / Manganese metal

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Letteratura scientifica selezionata sul tema "Manganese metal"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 3 febbraio 2022

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Articoli di riviste sul tema "Manganese metal"

1

Zhang, Chao, Shuai Wang, Zhan-fang Cao e Hong Zhong. "Recovery of manganese from manganese oxide ores in the EDTA solution". Metallurgical Research & Technology 115, n. 3 (2018): 306. http://dx.doi.org/10.1051/metal/2018004.

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A new process has been experimentally and theoretically established for the recovery of manganese from manganese oxide ores, mainly including the reductive leaching of manganese by ethylenediaminetetraacetic acid (EDTA), EDTA recovery, and manganese electrolysis. The experimental conditions for this process were investigated. Moderate leaching environment by EDTA with the pH in the range of 5–6 is of benefit to leach manganese from some manganese oxide ores with high-content impurities, such as iron and aluminum. Most of EDTA can be recovered by acidification. A small amount of the residual EDTA in the electrolyte can prevent the generation of anode mud. In addition, trimanganese tetroxide (Mn3O4) can be obtained by the roasting of the EDTA–Mn crystallized product.
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Park, Yaewon, Shuang Liu, Terrence Gardner, Drake Johnson, Aaron Keeler, Nathalia Ortiz, Ghada Rabah e Ericka Ford. "Biohybrid nanofibers containing manganese oxide–forming fungi for heavy metal removal from water". Journal of Engineered Fibers and Fabrics 15 (gennaio 2020): 155892501989895. http://dx.doi.org/10.1177/1558925019898954.

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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.
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Malinenko, V. P., L. A. Aleshina, A. L. Pergament e G. V. Germak. "Switching Effects and Metal−Insulator Transition in Manganese Oxide". Journal on Selected Topics in Nano Electronics and Computing 1, n. 1 (dicembre 2013): 44–50. http://dx.doi.org/10.15393/j8.art.2013.3005.

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4

Lewandowski, Z., R. Avci, M. Geiser, X. Shi, K. Braughton e N. Yurt. "Biofouling and corrosion of stainless steels in natural waters". Water Supply 2, n. 4 (1 settembre 2002): 65–72. http://dx.doi.org/10.2166/ws.2002.0122.

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Abstract (sommario):
The noble shift in corrosion potential to values between +300 and +400 mVSCE and the accompanying increase in cathodic current density and polarization slope at mild cathodic potentials that develop during microbial colonization of passive metals, are collectively known as ennoblement. This phenomenon is of concern as the noble shift in the corrosion potential may lead to pitting corrosion. We have demonstrated, by growing pure cultures of manganese oxidizing bacteria (MOB) Leptothrix discophora SP-6 under well defined conditions, that microbial deposition of manganese oxides causes ennoblement of 316L stainless steel (SS). Exposing 316L corrosion coupons in lakes and streams supported this conclusion; the rate and extent of ennoblement were positively correlated with the rates of deposition and the amounts of biomineralized manganese oxides deposited on the surfaces of the SS corrosion coupons. X-ray photoelectron spectroscopy (XPS) analyses of the deposits from the ennobled coupons revealed a mixture of manganese oxides, as expected. Many natural waters can support growth of MOB. When manganese-oxidizing biofilms accumulate on surfaces of passive metals there is a potential for manganese redox cycling on the metal surface. This process is initiated by depositing minute amounts of manganese oxides on the metal surface. These microbially deposited manganese oxides are then reduced by the electrons derived from anodic dissolution of the metal; the metal is corroding and the manganese oxides are reduced to divalent manganese ions. However, since the manganese ions are liberated within the manganese-oxidizing biofilm, the manganese ions are immediately reoxidized, and the cycle continues.
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Zhu, Xiang-Ying, Yu-Chun Zhai e Guo-Hua Zhang. "Nitriding of manganese pellet". Metallurgical Research & Technology 114, n. 5 (2017): 518. http://dx.doi.org/10.1051/metal/2017063.

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Sommerfeld, Marcus, David Friedmann, Thomas Kuhn e Bernd Friedrich. "“Zero-Waste”: A Sustainable Approach on Pyrometallurgical Processing of Manganese Nodule Slags". Minerals 8, n. 12 (23 novembre 2018): 544. http://dx.doi.org/10.3390/min8120544.

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A continuously growing demand for valuable non-ferrous metals and therefore an increase in their prices at the metal exchanges makes it necessary and profitable to investigate alternative metal resources. Polymetallic deep-sea nodules contain cobalt, copper, manganese, molybdenum and nickel, and are highly abundant on the sea floor. Developing a metallurgical process to recover the metal content from manganese nodules can close the predicted supply gap of critical metals like cobalt. This paper investigated a potential extraction process for valuable metals from manganese nodules supplied by the German Federal Institute for Geosciences and Natural Resources. The samples originated from the German license area of the Clarion-Clipperton Zone in the Pacific Ocean. Due to a low concentration of valuable metals in nodules, a pyrometallurgical enrichment step was carried out to separate cobalt, copper, molybdenum and nickel in a metallic phase. The manganese was discarded in the slag and recovered in a second smelting step as ferromanganese. To aid the experiments, FactSageTM was used for thermodynamic modeling of the smelting steps. To increase metal yields and to alter the composition of the metal alloys, different fluxes were investigated. The final slag after two reduction steps were heavy-metal free and a utilization as a mineral product was desired to ensure a zero-waste process.
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Wu, Fangfang, Zhu Xiao, Bin Zeng, Long Chen, Hui Liu, Min Liang, Peng Yu e Baobin Mi. "Experimental and reduction leaching kinetics simulation of iron-rich manganese oxide ore using tobacco stem concrete as reducing agent". Metallurgical Research & Technology 116, n. 4 (2019): 422. http://dx.doi.org/10.1051/metal/2019017.

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Reduction leaching behaviors of Fe and Mn from an iron-rich manganese oxide ore using waste tobacco stem concrete as reducing agent were investigated in this paper with a view to determining the feasibility of tobacco stem concrete used in reduction leaching of Mn from iron-rich manganese oxide ore. Results indicated that the leaching processes of Fe and Mn were both dominated by internal diffusion, but the effects of leaching parameters on leaching ratios of Fe and Mn were different based on established leaching kinetic equations. The leaching ratio of Mn reached up to 96.18% while that of Fe kept a lower concentration (17.66%) under optimal leaching conditions, which achieved high selectivity recovery of Mn from iron-rich manganese oxide ore. In addition, the leached solution can be used as electrolytic stock solution in the production of electrolytic manganese. Characterization of the obtained electrolytic manganese product indicated that the quality of electrolytic manganese fully met the standards of YB/T 051-2003, which disclosing a novel recycling approach of utilizing the resource coming from the tobacco industry.
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Heindl, Jason E., Michael E. Hibbing, Jing Xu, Ramya Natarajan, Aaron M. Buechlein e Clay Fuqua. "Discrete Responses to Limitation for Iron and Manganese in Agrobacterium tumefaciens: Influence on Attachment and Biofilm Formation". Journal of Bacteriology 198, n. 5 (28 dicembre 2015): 816–29. http://dx.doi.org/10.1128/jb.00668-15.

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ABSTRACTTransition metals such as iron and manganese are crucial trace nutrients for the growth of most bacteria, functioning as catalytic cofactors for many essential enzymes. Dedicated uptake and regulatory systems have evolved to ensure their acquisition for growth, while preventing toxicity. Transcriptomic analysis of the iron- and manganese-responsive regulons ofAgrobacterium tumefaciensrevealed that there are discrete regulatory networks that respond to changes in iron and manganese levels. Complementing earlier studies, the iron-responsive gene network is quite large and includes many aspects of iron-dependent metabolism and the iron-sparing response. In contrast, the manganese-responsive network is restricted to a limited number of genes, many of which can be linked to transport and utilization of the transition metal. Several of the target genes predicted to drive manganese uptake are required for growth under manganese-limited conditions, and anA. tumefaciensmutant with a manganese transport deficiency is attenuated for plant virulence. Iron and manganese limitation independently inhibit biofilm formation byA. tumefaciens, and several candidate genes that could impact biofilm formation were identified in each regulon. The biofilm-inhibitory effects of iron and manganese do not rely on recognized metal-responsive transcriptional regulators, suggesting alternate mechanisms influencing biofilm formation. However, under low-manganese conditions thedcpAoperon is upregulated, encoding a system that controls levels of the cyclic di-GMP second messenger. Mutation of this regulatory pathway dampens the effect of manganese limitation.IMPORTANCEResponses to changes in transition metal levels, such as those of manganese and iron, are important for normal metabolism and growth in bacteria. Our study used global gene expression profiling to understand the response of the plant pathogenAgrobacterium tumefaciensto changes of transition metal availability. Among the properties that are affected by both iron and manganese levels are those required for normal surface attachment and biofilm formation, but the requirement for each of these transition metals is mechanistically independent from the other.
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Abd Elmomen, Sanaa S. "Manganese Distribution between Slag and Metal in the Egyptian Blast Furnace". Key Engineering Materials 786 (ottobre 2018): 65–74. http://dx.doi.org/10.4028/www.scientific.net/kem.786.65.

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Daily average slag and the corresponding hot metal samples were collected from blast furnace No.3 (1033m3useful volume) of the Egyptian Iron and Steel Company (EISCO) charged with 100% self- fluxing sinter over a period of two months (from July to August 2015). The analyses of slag and metal were used to investigate the effects of temperature and basicity, defined as CaO/SiO2,on manganate capacity and manganese distribution between slag and metal.
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Lu, Jianming, David Dreisinger e Thomas Glück. "Electrolytic manganese metal production from manganese carbonate precipitate". Hydrometallurgy 161 (maggio 2016): 45–53. http://dx.doi.org/10.1016/j.hydromet.2016.01.010.

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Tesi sul tema "Manganese metal"

1

Ball, R. J. "Redox-geometry relationships in transition metal complexes". Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273126.

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2

Thomas, Jaron Michael. "On Metal synthesis of Some Substituted Rhenium and Manganese Complexes". TopSCHOLAR®, 2012. http://digitalcommons.wku.edu/theses/1225.

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Heterocyclic organic and organometallic compounds (i.e. polypyrrole), and their derivatives, have been of great interest for conductive polymers due to their novel properties and environmental stability as compared to their non-aromatic analogs (i.e. polyacetylene). Our current interest focus upon the potential role of metal ligand bound pyridazines as the next generation of electronic devices that utilize the metal ligands bound to organics as the semiconducting material. Pyridazine is a 6-membered aromatic ring with two adjacent nitrogen atoms. These are promising candidates for a variety of materials and commercial applications; but they are difficult to get a metal ligand to fuse to the aromatic ring. Our recent efforts focused in attaching Rhenium and Manganese ligands/substituents (process in which is called doping) that would cause oxidation to occur to our polymer making it a p-type polymer. Since p-type polymers charge carriers leave a vacancy that does not delocalize completely. This vacancy (known as a hole) or a radical cation that only partially delocalizes over several monomeric units causing them to be structurally deformed. This deformed structure is at a higher energy than that of an undoped polymer. Typical carriers in organic semiconductors are holes and electrons in a π-orbital. So when these molecules of π-conjugated systems have a π-bond overlap (or π- stacking), electrons can move via these π-electron clouds overlapping thus causing an electrical current. Our worked focused on the synthesis of pyridazines and their organometallic rhenium complexes and polymer research. Several aryl-substituted 5,6-fused pyridazines have been synthesized but none have been documented until this study. The main goal of the research was to fully characterize the general synthesis of furan containing organometallic complexes, [M(CO)3{η5-1,2-C5H3(CC4H3ON)(CC4H3ON)}] (M = Re or Mn) (4B). We successfully characterized the ability to attach a metal organic ligand to pyridazine though IR and NMR. However, when attempts were made to recrystallize our product, we yielded an orange-brown, block like crystal of 1,2- C5H3(CC4H3ONH)(CC4H3ON) (5) in which our metal ligand group fell off and we were left with pyridazine and inorganics. Though, we successfully got an X-ray characterization and electronic studies of compound 5 which are reported herein.
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Javaid, Saqib. "Magnetism and electronic structure at hybrid manganese-phthalocyanine/metal interfaces". Strasbourg, 2011. https://publication-theses.unistra.fr/public/theses_doctorat/2011/JAVAID_Saqib_2011.pdf.

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Nous avons étudié le mécanisme d'adsorption de la molécule MnPc sur le Co(001) ou le Cu (001) et les interactions d’interface qui en découlent. Nos calculs GGA montrent que la molécule MnPc est chimisorbée sur Co et conduit à de fortes interactions magnétiques à l’interface, notamment au couplage magnétique entre la molécule MnPc et le substrat de Co, et à une polarisation magnétique induite au niveau de Fermi sur les sites N et C. En raison de la chimisorption de MnPc sur Co, l'introduction des interactions faibles de vdW n'apporte aucun changement significatif à la structure électronique d’interface. Toutefois, le calcul GGA montre que la molécule MnPc sur Cu est physisorbée en raison des interactions chimiques très faibles. Nos calculs montrent qu’à l'opposé de MnPc sur Co, les interactions vdW modifient fortement la structure électronique d’interface de MnPc/ Cu. Cela conduit à un changement significatif du mécanisme d'adsorption de MnPc sur Cu (de la physisorption à une faible chimisorption). Du point de vue de la spintronique, la polarisation de spin sur MnPc, induite et modulée par des substrats ferromagnétiques souligne la pertinence des interfaces hybrides MPc/métalferromagnétique pour l'injection de spin et le transport de spins
We have studied the adsorption mechanism of MnPc on Co(001) and Cu(001) and the ensuing interfacial interactions. Our GGA calculations show that MnPc is chemisorbed on Co. The chemisroption of MnPc on ferromagnetic Co results in strong interfacial magnetic interactions, leading to magnetic coupling of MnPc with Co substrate and also the induction of a a net positive spin polarisation at N and C sites at EF. Due to the chemisorption of MnPc on Co, the introduction of weak vdW interaction does not bring a significant change to the interfacial electronic structure. However, MnPc on Cu is described to be physisorbed by GGA due to very weak chemical interactions at interface. In sharp contrast to MnPc/Co, the vdW interactions strongly modify the MnPc/Cu interfacial electronic structure. This leads to change of adsorption mechanism of MnPc on Cu from physisorption to weak chemisorption. From spintronics perspective, the spin polarisation on MnPc, induced and modulated by ferromagnetic substrates underscores the suitability of MPc/ferromagnetic hybrid interfaces for the efficient spin injection and spin transport
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Rydén, Jens Olof Stefan. "Computational studies Of manganese-ligand clusters in the gas-phase and manganese atoms in graphene and metal-organic frameworks". Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/7400/.

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The work in this thesis deals with computational studies of manganese ions and atoms in the gas-phase and in the solid phase. The results are divided into three chapters, and the theory and methods used are explained and discussed in a separate theory chapter. The first results on manganese and its coordination to water and methanol molecules in the gas-phase are discussed in the light of physical properties for different ligands including water and methanol. Preferred coordination of a specific ligand type, preferred complex or cluster size as well as coordination modes are thoroughly investigated. Also discussed is stability against proton-transfer reactions for a few manganese-water and manganese-methanol clusters. The work is carried out at the HF/6- 31G(d), MP2/6-311G(d,p) and B3LYP/6-311(3df,3pd)-level of theory using the computer code Gaussian. The results presented here are in good agreement with experimental results and findings. It is concluded that mixing between 4s and 3d orbitals on the manganese atom is responsible for preference for a specific cluster size and that occupation of anti-bonding orbitals destabilizes the cluster, for a specific coordination mode. The next results are for manganese atoms in a double layer of graphite, using the computer code Aimpro. Different coordination modes are investigated as are magnetic properties upon adsorption and modification of the band structure compared to a pristine double layer of graphene. Only one case of a significantly high spin polarization is encountered, and the spin polarization on the manganese atom and the surrounding carbon atoms is investigated with Mulliken analysis. This study is in agreement with previous work in the same field, but provides a more realistic picture since a larger system is considered here. The final chapter deals with manganese atoms in metal-organic frameworks, MOFs, using the Aimpro code. Magnetic properties and binding energies for adsorption of selected molecules are discussed in this chapter. Magnetic properties are discussed using Mulliken analysis. Modification of the band structure upon coordination of these gas molecules is shown and investigated. Very few experimental results exist in this field for this structure, but its role as a potential candidate for hydrogen storage will specifically be discussed.
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Borton, Peter Thomas. "Preparation and Characterization of Manganese Fulleride". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1354556594.

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Krueger, Kathryn Marie. "Metal fluxes across the sediment water interface in a drinking water reservoir". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90297.

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Elevated concentrations of iron (Fe) and manganese (Mn) in drinking water degrade water quality by affecting taste, odor, and color. Under oxic conditions (dissolved oxygen (DO) >2 mg/L), Fe and Mn are rarely present in soluble form in natural waters, as they occur as insoluble, oxidized minerals in sediments. However, the development of low DO concentrations in the bottom waters of some lakes and drinking water reservoirs during thermal stratification can lead to the reduction of oxidized, insoluble Fe and Mn in sediments to soluble forms, which are then released into the water column. In response, many water utilities have installed oxygenation systems to control metal concentrations in situ in drinking water reservoirs. However, previous research has found anoxic (DO < 0.5 mg/L) conditions still develop within sediments, even with operational oxygenation systems, allowing for the reduction and release of soluble Fe and Mn into the water column. To examine the drivers of metal release from sediments into the water column, I conducted sediment flux chamber experiments to directly quantify Fe and Mn fluxes at the sediment-water interface of a small, eutrophic drinking water reservoir (Falling Creek Reservoir, Vinton, VA). The experiments were conducted twice during the 2018 summer stratification period (April 24 – October 21). Using the flux chambers, I measured total and soluble Fe and Mn concentrations under changing oxygen conditions over 10-day periods to calculate fluxes. Throughout the experiments, I monitored DO, oxidation-reduction potential (ORP), temperature, and pH. In addition to the direct measurements, I also estimated metal fluxes using a mass balance method, which relies on measurements of metal inputs and outputs into the bottom waters of the reservoir. Overall, our results showed that fluxes are highly variable during the stratification period, with some periods having positive fluxes (release of metals from sediment to the water column) and some with negative fluxes (return of metals from the water column to sediment). The metal fluxes are highly sensitive to redox conditions in the water column, sediment-water interface and sediments. Metal fluxes measured using the chambers are 91-105% higher than those estimated using the mass balance method. This difference supports result of previous work that the flux chamber method likely provides maximum values of metal fluxes as the isolated chamber water does not allow for mixing with the bottom waters. In contrast, because the mass balance method relies on water column data, results are affected by mixing and biogeochemical reactions that can remove metals from the water column; thus, flux estimates using this method likely reflect minimum values. However, when used together, these two methods provide a useful tool for constraining metal fluxes under different redox conditions and highlight the importance of measuring ORP in addition to DO. The results of this study can be used by water utilities to improve the effectiveness of engineered oxygenation systems and water quality management practices related to iron and manganese.
Master of Science
In many drinking water reservoirs, elevated concentrations of metals, such as iron (Fe) and manganese (Mn), pose a challenging water quality problem. Elevated metal concentrations affect taste, color, and odor in drinking water and can be expensive to treat for. The presence of Fe and Mn in water is influenced by the oxygen concentrations in the water. When oxygen levels in the water are high, Fe and Mn are not soluble in water. However, when the oxygen levels in water are low, Fe and Mn can be released from soils, sediments and rocks into water and can thus pose a concern for drinking water quality. Many water utilities have installed systems to increase oxygen concentrations in drinking water reservoirs with the goal of maintaining low levels of metals in water supplies. However, previous research has shown that even when oxygenation systems are operational, Fe and Mn can still be released into water from the reservoir’s bottom sediments. To examine the factors that contribute to the release of metals from the sediments into the water column, I measured the rate of release of Fe and Mn from the sediments into the water column at a local drinking water reservoir (Falling Creek Reservoir, Vinton, VA). I conducted the experiments twice during summer 2018 using chambers that isolated the water immediately above the sediments. During the experiments, I monitored how Fe and Mn concentrations changed over time under different oxygen conditions. In addition to the measurements, I also used a mass balance method using water column data to estimate the metal release. Overall, results showed that release rates are highly variable during the summer months, with some periods having positive rates (releasing metals from sediments into the water column) and some with negative rates (returning metals from the water column to sediment). The metal release rate are highly sensitive to oxygen conditions in the water column, at the sediment-water interface and in the sediments. When used together, these two methods provide a useful tool for constraining metal release rates under different oxygen conditions. This research will help drinking water plant managers to improve the effectiveness of oxygenation systems and water quality management practices related to Fe and Mn. Additionally, this research will help improve the water quality for residents and can be applied to other lakes and reservoirs where metal concentrations are elevated.
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Faulkner, Charlotte Waveney. "A study of some ruthenium(II) and manganese(I) acetylide and vinylidene complexes". Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272793.

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Bryant, Jasmine R. "Mechanistic studies of the oxidations of hydrocarbons by manganese and ruthenium transition metal complexes /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/8586.

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Rolle, Clarence J. "Selective aerobic oxidations catalyzed by manganese(III) complexes using redox-active ligands". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42827.

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Selective oxidations are important for the functionalization of compounds in organic synthesis and chemical industry. Using O2 as a terminal e- acceptor would be ideal because it is cheap and environmentally friendly, but aerobic oxidations are often prone to unselective free radical autoxidation. Recently developed palladium catalysts use O2 as a selective multi-electron oxidant for various organic transformations. Although these methods are powerful and sophisticated, the lower cost of base metals makes them attractive as potential alternatives. The challenge is to develop methods for effecting multi-electron transformations at metals that typically prefer one electron changes. To this end, the development of manganese(III) complexes containing redox-active ligands as catalysts for selective oxidase-type oxidation of organic substrates was pursued. Bis(tetrabromocatecholato) manganese(III) complexes were shown to aerobically oxidize catechols to form quinones and H2O2. This reactivity was extended to other alcohol and amine substrates. In these reactions, the non-innocent tetrabromocatecholate ligands may impart a multi-electron character to the metal. To directly probe the intermediacy of ligand-centered radicals in catalytic turnover, a series of structurally similar manganese(III) complexes with aminophenol-derived ligands were prepared and characterized. The capacity of these ligands to undergo low-energy redox changes, allowed for isolation of an electron transfer series spanning two redox states without a change in oxidation state at the metal center. The ligand-centered redox events were a key feature in aerobic homocoupling of Grignard reagents.
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Szeinbaum, Nadia Heliana. "Role of microbial manganese respiration in the anaerobic cycling of nitrogen". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53407.

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Despite the environmental significance of microbial manganese reduction, the molecular mechanism of microbial manganese respiration remains poorly understood. Soluble Mn(III) has been recently found to be a dominant soluble species in aquatic systems, yet little is known about the identity of microbial populations catalyzing Mn(III) reduction in the environment nor the molecular mechanism of Mn(III) respiration. In this research, a suite of Mn(III) reduction-deficient mutant strains were isolated, including Mn(III) reduction-deficient mutant strain Mn3-1 that also displayed the ability to reduce soluble organic-Fe(III), but not solid Fe(III) oxides, demonstrating for the first time that the reduction of soluble organic-Fe(III) and solid Fe(III) oxides proceed through electron transport pathways with at least one distinct component. This work also shows that the electron transport pathway for Mn(III) reduction in S. oneidensis shares many of the electron transport components of Fe(III) and Mn(IV) reduction pathways and that Mn(IV) reduction to Mn(II) proceeds step-wise through two one-electron transfer reactions with Mn(III) as a transient intermediate. Finally, sediment incubations were carried out to enrich for NH4+ oxidizing- Mn(III) reducing consortia. The Mn(III) reducing consortium was found to be dominated by an electrogenic Ochrobactrum sp. and a Shewanella sp. The isolated Shewanella strain is able to oxidize acetate with Mn(III) as electron acceptor, an activity never observed before in a metal-reducing member of the Shewanella genus.
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Più fonti

Libri sul tema "Manganese metal"

1

United States International Trade Commission. Manganese metal from the People's Republic of China. Washington, DC: U.S. International Trade Commission, 1994.

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2

South Africaʼs chrome, manganese, platinum and vanadium: Foreign views of the mineral dependancy issue, 1970-1984 : a select and annotated bibliography. Braamfontein, South Africa: South African Institute of International Affairs, 1985.

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3

Lis, Jadwiga. Mikrosegregacja manganu w stalach niskowęglowych w trakcie obróbki cieplnej. Częstochowa: Wydawn. WIPMiFS, 2005.

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4

Foster, Russell J. Technological alternatives for the conservation of strategic and critical minerals--cobalt, chromium, manganese, and platinum-group metals: A review. [Avondale, Md.]: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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5

Jaagumagi, R. Development of the Ontario provincial sediment quality guidelines for arsenic, cadmium, chromium, copper, iron, lead, manganese, mercury, nickel, and zinc: Report. [Toronto]: Water Resources Branch, Ontario Ministry of the Environment, 1992.

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6

Conference on Manganese Containing Stainless Steels. High manganese high nitrogen austenitic steels: Proceedings of two Conferences on High Manganese Austenitic Steels, the First Conference held in conjunction with ASM International's Materials Week '87, Cincinnati, Ohio, 10-15 October 1987, the Second Conference held in conjunction with ASM International's Materials Week '92, Chicago, Illinois, 2-4 November 1992. Materials Park, Ohio: ASM International, 1992.

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Mukhopadhyay, Ranadhir. The Indian Ocean nodule field: Geology and resource potential. Amsterdam: Elsevier, 2008.

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Sigel, Helmut, e Astrid Sigel. Metal Ions in Biological Systems: Volume 37: Manganese and Its Role in Biological Processes (Metal Ions in Biological Systems). CRC, 2000.

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Tuschl, Karin, Peter T. Clayton e Philippa B. Mills. Disorders of Manganese Metabolism. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199972135.003.0045.

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Manganese is an essential trace metal for numerous metalloenzymes. Manganese homeostasis requires tight regulation in vivo and disruption of this balance can lead to manganese overload and subsequent accumulation of manganese in brain, liver, and blood. Mutations in SLC30A10, a cell surface-localized manganese efflux transporter, cause an autosomal recessive hypermanganesemia syndrome with two distinct phenotypes: childhood onset dystonia and adult onset Parkinsonism, associated with chronic liver disease, polycythemia and features of iron depletion. MRI brain appearances are characteristic of Mn deposition with hyperintense basal ganglia on T1-weighted images. Chelation therapy with disodium calcium edetate and iron supplementation effectively lower blood manganese levels, halt liver disease progression and improve neurological symptoms.The inherited form of hypermanganesemia can be distinguished from acquired causes of manganese overload including environmental overexposure and acquired hepatocerebral degeneration in cases of end stage liver disease.
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Beller, Matthias, Xiao-Feng Wu e James Spivey. Economic Synthesis of Heterocycles: Zinc, Iron, Copper, Cobalt, Manganese and Nickel Catalysts. Royal Society of Chemistry, The, 2014.

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Capitoli di libri sul tema "Manganese metal"

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Lebrun, Nathalie, e Pierre Perrot. "Carbon – Manganese – Silicon". In Refractory metal systems, 433–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02700-0_29.

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Lebrun, Nathalie, Pierre Perrot, An Serbruyns e Jean-Claude Tedenac. "Boron – Chromium – Manganese". In Refractory metal systems, 648–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88053-0_26.

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Roth, Jerome, Silvia Ponzoni e Michael Aschner. "Manganese Homeostasis and Transport". In Metal Ions in Life Sciences, 169–201. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5561-1_6.

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Freeland-Graves, Jeanne H., Tanushree Bose e Abbass Karbassian. "25Mn Manganese Metallotherapeutics". In Metallotherapeutic Drugs and Metal-Based Diagnostic Agents, 159–78. Chichester, UK: John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470864052.ch9.

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Tu, Zhongbing, Xiaoping Liang, Xiangguan Yang, Shilei Ren, Chengbo Wu e Yu Wang. "Recovery of Manganese by Roasting-Ammonia Leaching from Low-Grade Manganese Carbonate Ores". In Rare Metal Technology 2019, 99–107. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05740-4_11.

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Avila, Daiana Silva, Robson Luiz Puntel e Michael Aschner. "Manganese in Health and Disease". In Metal Ions in Life Sciences, 199–227. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7500-8_7.

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Bhattacharya, Pabitra Krishna, e Prakash B. Samnani. "Magnesium and Manganese in Photosynthesis in Plants". In Metal Ions in Biochemistry, 177–86. 2nd edition. | Boca Raton : CRC Press, 2021. | Originally published: Metal ions in biochemistry / P.K. Bhattacharya. 2005.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003108429-9.

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Fordahl, Steven C., e Keith M. Erikson. "The Neurochemical Alterations Associated with Manganese Toxicity". In Metal Ion in Stroke, 549–67. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-9663-3_27.

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Michalke, Bernhard. "Manganese Speciation Related to Neurotoxicity in Humans". In Metal Ion in Stroke, 569–89. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-9663-3_28.

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de Klein, W. J. "Reactions with Manganese (III) Acetate". In Organic Syntheses by Oxidation with Metal Compounds, 261–314. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2109-5_4.

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Atti di convegni sul tema "Manganese metal"

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PODANÝ, Pavel, Michal DUCHEK e Tomáš STUDECKÝ. "Heat Treatment of Low Carbon High Manganese TWIP Steel". In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.867.

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WIESZAŁA, Robert, Jarosław PIĄTKOWSKI e Jarosław KOZUBA. "INFLUENCE OF MANGANESE ON THE MICROSTRUCTURE OF SECONDARY ALLOYS Al-Si-Mg". In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.769.

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TOMASZEWSKA, Agnieszka, Magdalena JABŁOŃSKA, Marek TKOCZ e Iwona BEDNARCZYK. "The effect of cold drawing on properties and microstructure of manganese austenitic steel wire". In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.828.

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VORON, Mykhailo, Yuriy KOSTETSKY e Marina FON PRUSS. "GETTING A COMPLEX MASTER ALLOY FOR ALLOYING HIGH-MANGANESE STEELS AND CAST ALUMINUM ALLOYS". In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3458.

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CARPIO, Marcel, Jessica MUÑOZ, Omar GARCÍA, José Mara CABRERA e Juan Pablo PEDRAZA. "Effect of Manganese during the stabilization of austenite in Quench and Partitioning (Q&P) Steels". In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.711.

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Goto, Koji, Tetsuo Yamazaki, Naoki Nakatani e Rei Arai. "Preliminary Economic Feasibility Analysis of Cobalt-Rich Manganese Crust Mining for Rare Metal Recovery". In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20243.

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The importance of cobalt-rich manganese crusts on the Pacific seamounts for possible future rare metal sources has currently been recognized. The thin layer-type deposit characteristics affect not only the excavation efficiency but also the economy of mining venture. Considering the thin layer-type distribution and the utilization of some rare metals in cobalt-rich manganese crusts, a preliminary economic feasibility of the mining venture is evaluated. Under some preliminary technical assumptions, the possibility of cobalt-rich manganese crusts for future rare metal sources for Japan is examined. The important role of utilization of rare metals in the crusts is highlighted.
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WA KALENGA, Michel Kalenga, Didier Kasongo NYEMBWE e Merete TANGSTAD. "study on the influence of Al2O3/SiO2 on the KINETICS in the prereduction zone during high carbon ferromanganese production using basic south african manganese ores". In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3588.

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Harris, M., W. Ewing, C. DePasquale, S. Hays, W. Longo, R. Hatfield, M. Mount e R. Stapleton. "306. Manganese Exposures During Shielded Metal Arc Welding in a Confined Space". In AIHce 2004. AIHA, 2004. http://dx.doi.org/10.3320/1.2758235.

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Yang, Peng, Jeffrey E. Post, Qian Wang, Wenqian Xu, Roy Geiss, Patrick McCurdy e Mengqiang Zhu. "ADSORPTION OF METAL CATIONS AND OXYANIONS CONTROLS STABILITY OF LAYERED MANGANESE OXIDES". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340237.

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Mellon, Brian, Douglas R. McCain e Raymond M. Post. "Mitigating Manganese-Induced Pitting Failures on a Stainless Steel Surface Condenser". In ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88119.

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In early 2005, the 4-unit, 1200 MW Cottonwood Energy facility on the Sabine River in Deweyville, TX experienced a sudden increase in condenser tube failures and eddy current pit indications. Metallurgical analysis of failed tube specimens revealed the presence of a thin, hard manganese-rich coating, with intense pits propagating at breaks in the deposit. Successful mitigation of manganese-induced pitting and repassivation of the condenser tubes requires that the surface and pits first be thoroughly cleaned prior to implementing a manganese deposit control program. This paper reviews the successful cleaning process developed and implemented by Cottonwood Energy to remove manganese deposits from four stainless steel surface condensers. The cleaning procedure employed several novel features to ensure complete manganese removal, minimize environmental impact, reduce costs, control attack on the base tube metal, and ensure personnel safety. The paper also includes a discussion of corrective actions taken to prevent re-occurrence.
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Rapporti di organizzazioni sul tema "Manganese metal"

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Ramsey, Alexandra V. A hard X-ray study of a manganese-terpyridine catalyst in a chromium-based Metal Organic Framework. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213115.

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Ramsey, Alexandra. A Hard X-ray Study of a Manganese-Terpyridine Dimer Catalyst in a Chromium-Based Metal Organic Framework. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213117.

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Ramsey, Alexandra. A Hard X-ray Study of a Manganese-Terpyridine Dimer Catalyst in a Chromium-based Metal Organic Framework - Oral Presentation. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213175.

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Akinleye, Taiwo, Idil Deniz Akin, Amanda Hohner, Indranil Chowdhury, Richards Watts, Xianming Shi, Brendan Dutmer, James Mueller e Will Moody. Evaluation of Electrochemical Treatment for Removal of Arsenic and Manganese from Field Soil. Illinois Center for Transportation, giugno 2021. http://dx.doi.org/10.36501/0197-9191/21-019.

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Abstract (sommario):
Soils containing inorganic compounds are frequently encountered by transportation agencies during construction within the right-of-way, and they pose a threat to human health and the environment. As a result, construction activities may experience project delays and increased costs associated with management of inorganic compounds containing soils required to meet environmental regulations. Recalcitrance of metal-contaminated soils toward conventional treatment technologies is exacerbated in clay or organic content-rich fine-grained soils with low permeability and high sorption capacity because of increased treatment complexity, cost, and duration. The objective of this study was to develop an accelerated in situ electrochemical treatment approach to extract inorganic compounds from fine-grained soils, with the treatment time comparable to excavation and off-site disposal. Three reactor experiments were conducted on samples collected from two borehole locations from a field site in Illinois that contained arsenic (As)(~7.4 mg/kg) and manganese (Mn)(~700 mg/kg). A combination of hydrogen peroxide (H2O2) and/or citrate buffer solution was used to treat the soils. A low-intensity electrical field was applied to soil samples using a bench-scale reactor that resembles field-scale in situ electrochemical systems. For the treatment using 10% H2O2 and citrate buffer solution, average removal of 23% and 8% were achieved for Mn and As, respectively. With 4% H2O2 and citrate buffer, 39% and 24% removal were achieved for Mn and As; while using only citrate buffer as the electrolyte, 49% and 9% removal were achieved for Mn and As, respectively. All chemical regimes adopted in this study reduced the inorganic compound concentrations to below the maximum allowable concentration for Illinois as specified by the Illinois Environmental Protection Agency. The results from this work indicate that electrochemical systems that leverage low concentrations of hydrogen peroxide and citrate buffer can be effective for remediating soils containing manganese and arsenic.
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Pelletier, Austin, Amanda Hohner, Idil Deniz Akin, Indranil Chowdhury, Richard Watts, Xianming Shi, Brendan Dutmer e James Mueller. Bench-scale Electrochemical Treatment of Co-contaminated Clayey Soil. Illinois Center for Transportation, giugno 2021. http://dx.doi.org/10.36501/0197-9191/21-018.

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Industrial soil contamination is frequently unearthed by transportation agencies during construction within the right-of-way. As a result, transportation agencies may experience construction delays. Soils co-contaminated with high-molecular-weight polycyclic aromatic hydrocarbons (HMW-PAHs) and metals are commonly encountered in Illinois and exhibit recalcitrance towards conventional treatment technologies. This issue is exacerbated in the fine-grained soils common to Illinois, where low-permeability and immense sorption capacity increase treatment complexity, cost, and duration. Contaminated sites are spatially and temporally restrictive and require rapid in situ treatments, whereas conventional soil remediation requires 1 to 3 years on average. Consequently, transportation agencies typically pursue excavation and off-site disposal for expediency. However, this solution is expensive, so a comparatively expeditious and affordable treatment alternative is needed to combat the increasing cost of hazardous waste disposal. The objective of this work was to develop an accelerated in situ treatment approach adaptable for use at any construction site to cost-effectively remove HMW-PAHs and metals from clayey soil. It was hypothesized that an in situ electrochemical treatment which augments electrokinetics with H2O2 could remediate both HMW-PAHs and metals in less than a month. Bench-scale reactors resemblant of field-scale in situ electrokinetic systems were designed and fabricated to assess the electrochemical treatment of clayey soils contaminated with HMW-PAHs and metals. Pyrene, chromium, and manganese were used as model contaminants, spiked into kaolinite as a model clay. Electrokinetics were imposed by a low-intensity electrical field distributed by graphite rods. Electrolytic H2O2 systems were leveraged to distribute electrical current and facilitate contaminant removal. Average contaminant removals of 100%, 42.3%, and 4.5% were achieved for pyrene, manganese, and chromium, respectively. Successful development of this bench-scale treatment approach will serve to guide transportation agencies in field-scale implementation. The results from this work signify that electrochemical systems that leverage eco-friendly oxidant addition can replace excavation and disposal as a means of addressing clayey soils co-contaminated with HMW-PAHs and metals.
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Dunn, C. E., e N. L. Hastings. Biogeochemical survey of the Fraser Lake area using outer bark of Lodgepole pine (NTS 93K02/03): alkali metals, alkaline earths, manganese and aluminum, central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210376.

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Dunn, C. D., e N. L. Hastings. Biogeochemical survey of the Nechako River area using outer back of Lodgepole pine (NTS 93 F/9, 93 F/10, 93 F/15, 93 F/16 and parts of 93 F/11, 93 F/14, 93 K/1 and 93 K/2), alkali metals, alkaline earths, manganese and aluminum, central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211477.

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