Journal articles: 'Manganese (IV) Oxide'

1

Young, Jay A. "Manganese(IV) Oxide." Journal of Chemical Education 78, no. 10 (October 2001): 1327. http://dx.doi.org/10.1021/ed078p1327.

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Lynch, Sheridan, Genevieve Lynch, Will E. Lynch, and Clifford W. Padgett. "Crystal structures of four dimeric manganese(II) bromide coordination complexes with various derivatives of pyridine N-oxide." Acta Crystallographica Section E Crystallographic Communications 75, no. 8 (July 30, 2019): 1284–90. http://dx.doi.org/10.1107/s2056989019010557.

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Four manganese(II) bromide coordination complexes have been prepared with four pyridine N-oxides, viz. pyridine N-oxide (PNO), 2-methylpyridine N-oxide (2MePNO), 3-methylpyridine N-oxide (3MePNO), and 4-methylpyridine N-oxide (4MePNO). The compounds are bis(μ-pyridine N-oxide)bis[aquadibromido(pyridine N-oxide)manganese(II)], [Mn2Br4(C5H5NO)4(H2O)2] (I), bis(μ-2-methylpyridine N-oxide)bis[diaquadibromidomanganese(II)]–2-methylpyridine N-oxide (1/2), [Mn2Br4(C6H7NO)2(H2O)4]·2C6H7NO (II), bis(μ-3-methylpyridine N-oxide)bis[aquadibromido(3-methylpyridine N-oxide)manganese(II)], [Mn2Br4(C6H7NO)4(H2O)2] (III), and bis(μ-4-methylpyridine N-oxide)bis[dibromidomethanol(4-methylpyridine N-oxide)manganese(II)], [Mn2Br4(C6H7NO)4(CH3OH)2] (IV). All the compounds have one unique MnII atom and form a dimeric complex that contains two MnII atoms related by a crystallographic inversion center. Pseudo-octahedral six-coordinate manganese(II) centers are found in all four compounds. All four compounds form dimers of Mn atoms bridged by the oxygen atom of the PNO ligand. Compounds I, II and III exhibit a bound water of solvation, whereas compound IV contains a bound methanol molecule of solvation. Compounds I, III and IV exhibit the same arrangement of molecules around each manganese atom, ligated by two bromide ions, oxygen atoms of two PNO ligands and one solvent molecule, whereas in compound II each manganese atom is ligated by two bromide ions, one O atom of a PNO ligand and two water molecules with a second PNO molecule interacting with the complex via hydrogen bonding through the bound water molecules. All of the compounds form extended hydrogen-bonding networks, and compounds I, II, and IV exhibit offset π-stacking between PNO ligands of neighboring dimers.

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Flisyuk, Oleg M., Dar'ya A. Novikova, Sergey A. Panasenko, and Nikolay A. Martsulevich. "DETERMINATION OF OPTIMAL CONDITIONS FOR EFFECTIVE ABSORPTION OF NITROGEN AND SULFUR OXIDES BY IRON-MANGANESE CONCRETIONS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 11 (November 20, 2019): 150–55. http://dx.doi.org/10.6060/ivkkt.20196211.6015.

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Iron-manganese concretions (IMC) absorption characteristic and composition of the material was studied. The active component in it is manganese (IV) oxide MnO2. A method is proposed for using a suspension of iron-manganese concretions ore to capture industrial emissions: nitrogen oxide (II) NO and sulfur oxide (IV) SO2. This method involves the reaction of the absorption of nitrogen oxide (II) NO by manganese (IV) oxide MnO2 in the presence of nitric acid HNO3. The formation of manganese nitrate Mn(NO3)2 occurs. Also, the reaction of the absorption of sulfur oxide (IV) SO2 by manganese (IV) oxide MnO2 with the formation of manganese sulfate MnSO4 takes place. Special installations for research and development of the process of sorption were developed. The results of experimental studies of the sorption process of nitrogen oxide (II) NO and sulfur oxide (IV) SO2 by a suspension based on IMC are presented. The main parameters of the influence on the process of the system operation are indicated: time for reaching a constant mode, temperature of the working suspension, method of mixing. Tables and figures are given showing the experimental results of the processes with various factors of influence. Optimal conditions for maximum efficient conduction of nitrogen oxide and sulfur dioxide absorption process were determined for adsorption of these gases to 85% and 99%, respectively, from the model mixtures that corresponds to the waste gases. Comparative analysis of sorption processes of NO and SO2 was performed.

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Midgley, Derek, and Dennis E. Mulcahy. "The manganese(IV) oxide electrode as a manganese(II) sensor." Talanta 32, no. 1 (January 1985): 7–10. http://dx.doi.org/10.1016/0039-9140(85)80004-7.

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Eckert, James M., and Jason G. Hajinakitas. "Selective coprecipitation of colloidal manganese(IV) oxide." Analytica Chimica Acta 315, no. 1-2 (October 1995): 239–42. http://dx.doi.org/10.1016/0003-2670(95)00294-a.

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Cerri, Jose Alberto, Edson Roberto Leite, Douglas Gouvêa, Elson Longo, and Jose Arana Varela. "Effect of Cobalt(II) Oxide and Manganese(IV) Oxide on Sintering of Tin(IV) Oxide." Journal of the American Ceramic Society 79, no. 3 (April 13, 2005): 799–804. http://dx.doi.org/10.1111/j.1151-2916.1996.tb07949.x.

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Lennartson, Anders, and Christine J. McKenzie. "Oxidation of a dinuclear manganese(II) complex to an oxide-bridged dimanganese(IV) complex." Acta Crystallographica Section C Crystal Structure Communications 68, no. 12 (November 9, 2012): m347—m352. http://dx.doi.org/10.1107/s0108270112043296.

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Bis{μ-2-[bis(pyridin-2-ylmethyl)amino]acetato}bis[diaquamanganese(II)] bis(trifluoromethanesulfonate) monohydrate, [Mn2(C14H14N3O2)2(H2O)4](CF3O3S)2·H2O, (I), and bis{μ-3-[bis(pyridin-2-ylmethyl)amino]propionato}bis[aquamanganese(II)] bis(trifluoromethanesulfonate) dihydrate, [Mn2(C15H16N3O2)2(H2O)2](CF3O3S)2·2H2O, (II), form binuclear seven-coordinate complexes. Oxidation of (II) with ammonium hexanitratocerate(IV), (NH4)2[Ce(NO3)6], gave the oxide-bridged dimanganese(IV) complex di-μ-oxido-bis(bis{3-[bis(pyridin-2-ylmethyl)amino]propionato}manganese(IV)) bis[triaquatetranitratocerate(IV)], [Mn2O2(C15H16N3O2)2][Ce(NO3)4(H2O)3]2, (III). The manganese complexes in (II) and (III) sit on a site of \overline{1} symmetry.

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Hamada, Shuichi, Yoshiyuki Kudo, Junji Okada, and Hitomi Kano. "Preparation of monodispersed manganese (IV) oxide particles from manganese (II) carbonate." Journal of Colloid and Interface Science 118, no. 2 (August 1987): 356–65. http://dx.doi.org/10.1016/0021-9797(87)90470-x.

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Konkol, Izabela, Jan Cebula, and Adam Cenian. "Oxidization of hydrogen sulfide in biogas by manganese (IV) oxide particles." Environmental Engineering Research 26, no. 2 (April 16, 2020): 190343–0. http://dx.doi.org/10.4491/eer.2019.343.

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Hydrogen sulphide is corrosive to most metallic equipment such as pipelines, compressors, gas storage tanks, engines, turbines and other units. It acts as a strong poison for fuel cells and its combustion leads to SO2 emissions. Due to the problems associated with hydrogen sulphide, it is critical to remove it from biogas before further processing. The removal of hydrogen sulphide from biogas using MnO2, which acts as a sorbent and catalyst, was investigated. The research was conducted in a full-scale agriculture biogas plant using chicken manure and maize silage as substrate. The manganese dioxide (manganese (IV) oxide) was derived from the waste products of a water conditioning system, after manganese removal from drinking water. The obtained results showed significantly better adsorption of hydrogen sulphide and faster regeneration of the bed compared to the bed filled with hydrated iron oxides. The H2S concentration in the treated biogas dropped from about 1,650 to 0-5 ppm.

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10

Bellesia, Franco, Franco Ghelfi, Ugo M. Pagnoni, and Ariano Pinetti. "Oxidation of Thioethers by Manganese(IV) Oxide-Trimethylchlorosilane." Synthetic Communications 23, no. 12 (June 1993): 1759–69. http://dx.doi.org/10.1080/00397919308011274.

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11

Thanabalasingam, P., and W. F. Pickering. "Sorption of mercury(II) by manganese(IV) oxide." Environmental Pollution Series B, Chemical and Physical 10, no. 2 (January 1985): 115–28. http://dx.doi.org/10.1016/0143-148x(85)90009-6.

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12

Vlassopoulos, Dimitri, Masakazu Kanematsu, Elizabeth A. Henry, Jessica Goin, Alexander Leven, David Glaser, Steven S. Brown, and Peggy A. O'Day. "Manganese(iv) oxide amendments reduce methylmercury concentrations in sediment porewater." Environmental Science: Processes & Impacts 20, no. 12 (2018): 1746–60. http://dx.doi.org/10.1039/c7em00583k.

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Leven, Alexander, Dimitri Vlassopoulos, Masakazu Kanematsu, Jessica Goin, and Peggy A. O'Day. "Characterization of manganese oxide amendments for in situ remediation of mercury-contaminated sediments." Environmental Science: Processes & Impacts 20, no. 12 (2018): 1761–73. http://dx.doi.org/10.1039/c7em00576h.

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14

Ali, A. A., F. A. Al-Sagheer, and M. I. Zaki. "Surface Texture of Microcrystalline Tunnel-Structured Manganese(IV) Oxides: Nitrogen Sorptiometry and Electron Microscopy Studies." Adsorption Science & Technology 20, no. 7 (September 2002): 619–32. http://dx.doi.org/10.1260/02636170260504314.

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Three different modifications of manganese(IV) oxide, viz. cryptomelane, nsutite and todorokite-like, were synthesized by hydrothermal methods. The bulk chemical composition, phase composition, crystalline structure and particle morphology of the resulting materials were determined by thermogravimetry, atomic absorption spectroscopy, X-ray diffractometry, infrared spectroscopy and scanning electron microscopy. The surface chemical composition, texture and structure were assessed using X-ray photoelectron microscopy, nitrogen sorptiometry and high-resolution electron microscopy. The results highlighted the hydrothermal conditions under which such tunnel-structured modifications of manganese(IV) oxide can be successfully synthesized. Moreover, they revealed that (i) the bulk was microcrystalline, (ii) the crystallites were either fibrils (cryptomelane and nsutite) or rod-like (todorokite) with low-index exposed facets, (iii) the surface chemical composition mostly reflected that of the bulk and (iv) the surface texture was linked with high specific areas, slit-shaped mesopores associated with particle interstices and micropores which allowed surface accessibility to the bulk tunnels of the test oxides. The application of such test oxides as shape-selective oxidation catalysts appears worthy of investigation.

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Nielsen, Brian S., Erik H. Larsen, Ole Ladefoged, and Henrik R. Lam. "Subchronic, Low-Level Intraperitoneal Injections of Manganese (IV) Oxide and Manganese (II) Chloride Affect Rat Brain Neurochemistry." International Journal of Toxicology 36, no. 3 (May 2017): 239–51. http://dx.doi.org/10.1177/1091581817704378.

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Manganese (Mn) is neurotoxic and can induce manganism, a Parkinson-like disease categorized as being a serious central nervous system irreversible neurodegenerative disease. An increased risk of developing symptoms of Parkinson disease has been linked to work-related exposure, for example, for workers in agriculture, horticulture, and people living near areas with frequent use of Mn-containing pesticides. In this study, the focus was placed on neurochemical effects of Mn. Rats were dosed intraperitoneally with 0.9% NaCl (control), 1.22 mg Mn (as MnO2)/kg bodyweight (bw)/day, or 2.5 mg Mn (as MnCl2)/kg bw/day for 7 d/wk for 8 or 12 weeks. This dosing regimen adds relevant new knowledge about Mn neurotoxicity as a consequence of low-dose subchronic Mn dosing. Manganese concentrations increased in the striatum, the rest of the brain, and in plasma, and regional brain neurotransmitter concentrations, including noradrenaline, dopamine (DA), 5-hydroxytrytamine, glutamate, taurine, and γ-amino butyric acid, and the activity of acetylcholinesterase changed. Importantly, a target parameter for Parkinson disease and manganism, the striatal DA concentration, was reduced after 12 weeks of dosing with MnCl2. Plasma prolactin concentration was not significantly affected due to a potentially reduced dopaminergic inhibition of the prolactin release from the anterior hypophysis. No effects on the striatal α-synuclein and synaptophysin protein levels were detected.

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Jakar, Swati, Ramakant Chaturvedi, and Mohan Kumar Sharma. "COMPARISON OF EFFICIENCY OF APM AND MNO2 BY PHOTOCATALYTICAL DEGRADATION OF AZURE-B BASED ON QUALITY PARAMETER MODIFICATION." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 1 (May 26, 2014): 2092–100. http://dx.doi.org/10.24297/jac.v10i1.5584.

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This paper describes the comparison of photocatalytical activity of Ammonium Phosphomolybdate(APM) and Manganese(IV) Oxide forphotocatalytic degradation of Azure-B. This study is based on modificationsin quality parameters which take place during optimum photocatalytic degradation of Azure-B contaminated water using two hetrocatalystAmmonium Phosphomolybdate and Manganese(IV) Oxide separately. Various quality parameterslike pH, Alkalinity, Hardness, COD, BOD, DO, Conductivity, Salinity, TDS, and Concentration of Ca+2, Mg+2, Cl-, F-, NO3-, SO4-2 and turbidity were used for comparison.

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Jakar, Swati, Ramakant Chaturvedi, and Mohan Kumar Sharma. "COMPARISON OF EFFICIENCY OF APM AND MNO2 BY PHOTOCATALYTICAL DEGRADATION OF AZURE-B BASED ON QUALITY PARAMETER MODIFICATION." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 1 (April 5, 2014): 2092–100. http://dx.doi.org/10.24297/jac.v10i1.985.

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This paper describes the comparison of photocatalytical activity of Ammonium Phosphomolybdate(APM) and Manganese(IV) Oxide forphotocatalytic degradation of Azure-B. This study is based on modificationsin quality parameters which take place during optimum photocatalytic degradation of Azure-B contaminated water using two hetrocatalystAmmonium Phosphomolybdate and Manganese(IV) Oxide separately. Various quality parameterslike pH, Alkalinity, Hardness, COD, BOD, DO, Conductivity, Salinity, TDS, and Concentration of Ca+2, Mg+2, Cl-, F-, NO3-, SO4-2 and turbidity were used for comparison.

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Yelatontsev, D., and O. Kharitonova. "IMPROVEMENT OF THE TECHNO¬LOGY FOR OBTAINING MANGANESE(IV) OXIDE FROM SECONDARY RAW MATERIALS." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, no. 37 (April 23, 2021): 109–13. http://dx.doi.org/10.31319/2519-2884.37.2020.19.

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Today's level of integrated use of minerals and beneficiation wastes in Ukraine, in particular, at the Kryvbas GOK, is unsatisfactory, as it is generally allowing the production of additional types of construction products. The volume of mining is growing, but only a small percentage of the extracted volume is transferred to the finished product. The residue in the form of waste is returned to the environment, polluting it. The reason for this is the lack of technology for integrated mineral processing and waste disposal. The article presents the results of industrial tests of off-balance manganese ore processing technology of Ordzhonikidze GOK with a manganese content of 15–30%. It is shown that nitric acid leaching of manganese with subsequent precipitation of impurities with soda or alkali allows you to consistently purify manganese from transition and alkaline earth metals. The obtained manganese oxide has a high degree of purity, which allows obtaining pure compounds Mn (NO3)2∙6H2O, MnO2 and metallic manganese for chemical current sources. The use of columnar clarifiers with a fluidized bed with the application of pulsations allowed to eliminate time-consuming filtration processes. Concomitantly formed sodium nitrate serves as a raw material for mineral fertilizers. Experimental studies on the beneficiation of off-balance manganese ores allowed us to determine the main technological parameters of the extraction of components and to develop a technological scheme of beneficiation. According to the proposed technological scheme, it is possible to obtain high-quality concentrates of manganese (IV) oxide. The use of optimal technological parameters of enrichment allows up to 95% of Mn to be extracted from off-balance manganese raw materials. In the long run, this will reduce dependence on imports of manganese raw materials and significantly reduce the cost of domestic manganese products.

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Krupińska, Izabela. "The Impact of Potassium Manganate (VII) on the Effectiveness of Coagulation in the Removal of Iron and Manganese from Groundwater with an Increased Content of Organic Substances." Civil and Environmental Engineering Reports 27, no. 4 (December 20, 2017): 29–41. http://dx.doi.org/10.1515/ceer-2017-0048.

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Abstract The article presents the results of studies concerning the impact of the method of Fe(II) ion oxidisation (dissolved oxygen and potassium manganate (VII)) on the effectiveness of coagulation in the removal of iron and manganese from groundwater with an increased content of organic substances. The efficiencies of two coagulants were compared: aluminium sulphate (VI) and polyaluminium chloride (Flokor 1.2A). Among the used methods of iron (II) oxidisation, the best effects have been achieved by potassium manganate (VII) because one of the oxidation products was manganese oxide (IV) precipitating from water. Better results in purifying the water were obtained with the use of a prehydrolysed coagulant Flokor 1.2 A than aluminium sulphate (VI).

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20

Yamashita, Satoshi, Takuya Shiga, Masashi Kurashina, Masayuki Nihei, Hiroyuki Nojiri, Hiroshi Sawa, Toru Kakiuchi, and Hiroki Oshio. "Manganese(III,IV) and Manganese(III) Oxide Clusters Trapped by Copper(II) Complexes." Inorganic Chemistry 46, no. 10 (May 2007): 3810–12. http://dx.doi.org/10.1021/ic062258h.

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21

Hapeshi, Evroula, and Charis R. Theocharis. "Preparation and Characterization of a Cerium(IV)-incorporated Manganese Oxide OMS-2. Effect of Cerium(IV) Template on Octahedral Molecular Sieves of Manganese Oxide and Characterization of Manganese Oxide Molecular Sieves with Cerium(IV) as Dopant." Adsorption Science & Technology 26, no. 10 (December 2008): 789–801. http://dx.doi.org/10.1260/026361708788708289.

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22

Miyata, Naoyuki, Yukinori Tani, Kanako Maruo, Hiroshi Tsuno, Masahiro Sakata, and Keisuke Iwahori. "Manganese(IV) Oxide Production by Acremonium sp. Strain KR21-2 and Extracellular Mn(II) Oxidase Activity." Applied and Environmental Microbiology 72, no. 10 (October 2006): 6467–73. http://dx.doi.org/10.1128/aem.00417-06.

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ABSTRACT Ascomycetes that can deposit Mn(III, IV) oxides are widespread in aquatic and soil environments, yet the mechanism(s) involved in Mn oxide deposition remains unclear. A Mn(II)-oxidizing ascomycete, Acremonium sp. strain KR21-2, produced a Mn oxide phase with filamentous nanostructures. X-ray absorption near-edge structure (XANES) spectroscopy showed that the Mn phase was primarily Mn(IV). We purified to homogeneity a laccase-like enzyme with Mn(II) oxidase activity from cultures of strain KR21-2. The purified enzyme oxidized Mn(II) to yield suspended Mn particles; XANES spectra indicated that Mn(II) had been converted to Mn(IV). The pH optimum for Mn(II) oxidation was 7.0, and the apparent half-saturation constant was 0.20 mM. The enzyme oxidized ABTS [2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)] (pH optimum, 5.5; Km , 1.2 mM) and contained two copper atoms per molecule. Moreover, the N-terminal amino acid sequence (residues 3 to 25) was 61% identical with the corresponding sequence of an Acremonium polyphenol oxidase and 57% identical with that of a Myrothecium bilirubin oxidase. These results provide the first evidence that a fungal multicopper oxidase can convert Mn(II) to Mn(IV) oxide. The present study reinforces the notion of the contribution of multicopper oxidase to microbially mediated precipitation of Mn oxides and suggests that Acremonium sp. strain KR21-2 is a good model for understanding the oxidation of Mn in diverse ascomycetes.

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23

Sugawara, Michio, Masamichi Ohno, and Kenzo Matsuki. "Novel Preparation Method of Manganese(II) Manganese(IV) Oxide(Mn2Mn3O8, Mn5O8) by Citrate Process." Chemistry Letters 20, no. 8 (August 1991): 1465–68. http://dx.doi.org/10.1246/cl.1991.1465.

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Jin, Qiliang, Hiroshi Arimoto, Musashi Fujishima, and Hiroaki Tada. "Manganese Oxide-Surface Modified Titanium (IV) Dioxide as Environmental Catalyst." Catalysts 3, no. 2 (April 23, 2013): 444–54. http://dx.doi.org/10.3390/catal3020444.

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25

Havare, Nizam. "Oxidative cleavage of β-aryl alcohols using manganese(IV) oxide." Arkivoc 2020, no. 6 (August 3, 2020): 247–61. http://dx.doi.org/10.24820/ark.5550190.p011.249.

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Yousefi, Taher, Reza Davarkhah, Ahmad Nozad Golikand, and Mohammad Hossein Mashhadizadeh. "Synthesis, characterization, and supercapacitor studies of manganese (IV) oxide nanowires." Materials Science in Semiconductor Processing 16, no. 3 (June 2013): 868–76. http://dx.doi.org/10.1016/j.mssp.2013.01.012.

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Diamantini, Giuseppe, Ermanno Duranti, and Andrea Tontini. "Nitroisoxazoles by Manganese(IV) Oxide Oxidation of Nitro-4,5-dihydroisoxazoles." Synthesis 1993, no. 11 (1993): 1104–8. http://dx.doi.org/10.1055/s-1993-26010.

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BELLESIA, F., F. GHELFI, U. M. PAGNONI, and A. PINETTI. "ChemInform Abstract: Oxidation of Thioethers by Manganese(IV) Oxide-Trimethylchlorosilane." ChemInform 25, no. 6 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199406084.

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Liu, JiaYin, Yun Hau Ng, M. Baris Okatan, Rose Amal, Kashinath A. Bogle, and Valanoor Nagarajan. "Interface-dependent electrochemical behavior of nanostructured manganese (IV) oxide (Mn3O4)." Electrochimica Acta 130 (June 2014): 810–17. http://dx.doi.org/10.1016/j.electacta.2014.03.103.

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Sánchez-España and Yusta. "Coprecipitation of Co2+, Ni2+ and Zn2+ with Mn(III/IV) Oxides Formed in Metal-Rich Mine Waters." Minerals 9, no. 4 (April 10, 2019): 226. http://dx.doi.org/10.3390/min9040226.

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Manganese oxides are widespread in soils and natural waters, and their capacity to adsorb different trace metals such as Co, Ni, or Zn is well known. In this study, we aimed to compare the extent of trace metal coprecipitation in different Mn oxides formed during Mn(II) oxidation in highly concentrated, metal-rich mine waters. For this purpose, mine water samples collected from the deepest part of several acidic pit lakes in Spain (pH 2.7–4.2), with very high concentration of manganese (358–892 mg/L Mn) and trace metals (e.g., 795–10,394 µg/L Ni, 678–11,081 µg/L Co, 259–624 mg/L Zn), were neutralized to pH 8.0 in the laboratory and later used for Mn(II) oxidation experiments. These waters were subsequently allowed to oxidize at room temperature and pH = 8.5–9.0 over several weeks until Mn(II) was totally oxidized and a dense layer of manganese precipitates had been formed. These solids were characterized by different techniques for investigating the mineral phases formed and the amount of coprecipitated trace metals. All Mn oxides were fine-grained and poorly crystalline. Evidence from X-Ray Diffraction (XRD) and Scanning Electron Microscopy coupled to Energy Dispersive X-Ray Spectroscopy (SEM–EDX) suggests the formation of different manganese oxides with varying oxidation state ranging from Mn(III) (e.g., manganite) and Mn(III/IV) (e.g., birnessite, todorokite) to Mn(IV) (e.g., asbolane). Whole-precipitate analyses by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), and/or Atomic Absorption Spectrometry (AAS), provided important concentrations of trace metals in birnessite (e.g., up to 1424 ppm Co, 814 ppm Ni, and 2713 ppm Zn), while Co and Ni concentrations at weight percent units were detected in asbolane by SEM-EDX. This trace metal retention capacity is lower than that observed in natural Mn oxides (e.g., birnessite) formed in the water column in a circum-neutral pit lake (pH 7.0–8.0), or in desautelsite obtained in previous neutralization experiments (pH 9.0–10.0). However, given the very high amount of Mn sorbent material formed in the solutions (2.8–4.6 g/L Mn oxide), the formation of these Mn(III/IV) oxides invariably led to the virtually total removal of Co, Ni, and Zn from the aqueous phase. We evaluate these data in the context of mine water pollution treatment and recovery of critical metals.

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Nilsen, Ola, Steinar Foss, Arne Kjekshus, and Helmer Fjellvåg. "Growth of Nano-Needles of Manganese(IV) Oxide by Atomic Layer Deposition." Journal of Nanoscience and Nanotechnology 8, no. 2 (February 1, 2008): 1003–11. http://dx.doi.org/10.1166/jnn.2008.18154.

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Needles of manganese(IV) oxide in the nanometer range have been synthesised using the atomic layer deposition technique. Traditionally the atomic layer deposition technique is used for the fabrication of thin films, however, we find that needles of β-MnO2 are formed when manganese(IV) oxide is deposited as relatively thick (ca. 800 nm) thin films on substrates of α-Al2O3 [(001) and (012) oriented]. There is no formation of needles when the film is deposited on substrates such as Si(100) or soda lime glass. The film is formed using Mn(thd)3 (Hthd = 2,2,6,6-tetramethylheptane-3,5-dione) and ozone as precursors. While thin films (ca. 100 nm) consist of ε′-MnO2,22, 23 the same process applied to thicker films results in the formation of nano-needles of β-MnO2. These needles of β-MnO2 have dimensions ranging from approximately 1.5 μm at the base down to very sharp tips. The nano-needles and the bulk of the films have been analysed by atomic force microscopy, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy.

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Heidari, Sima, Mohammad Mahdi Najafpour, Małgorzata Hołyńska, Jitendra Pal Singh, Keun Hwa Chae, and Masoumeh Khatamian. "Water oxidation by simple manganese salts in the presence of cerium(iv) ammonium nitrate: towards a complete picture." Dalton Transactions 47, no. 5 (2018): 1557–65. http://dx.doi.org/10.1039/c7dt04143h.

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Najafpour, Mohammad Mahdi, Seyedeh Maedeh Hosseini, Małgorzata Hołyńska, Tatsuya Tomo, and Suleyman I. Allakhverdiev. "Gold nanorods or nanoparticles deposited on layered manganese oxide: new findings." New Journal of Chemistry 39, no. 9 (2015): 7260–67. http://dx.doi.org/10.1039/c5nj01392e.

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Nakamura, Masaharu, Toshihiro Inoue, and Eiichi Nakamura. "Synthesis of substituted cyclopropanone acetals by carbometallation and its oxidative cleavage with manganese(IV) oxide and lead(IV) oxide." Journal of Organometallic Chemistry 624, no. 1-2 (April 2001): 300–306. http://dx.doi.org/10.1016/s0022-328x(01)00679-9.

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Korshak, Yu V., M. V. Motyakin, I. V. Plyushchii, A. L. Kovarskii, Ye N. Degtyarev, A. G. Petrushevska, R. A. Alekperov, et al. "Pyrrole oxidative polymerization by manganese oxide (IV) on silica gel surface." Polymer 180 (October 2019): 121717. http://dx.doi.org/10.1016/j.polymer.2019.121717.

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36

Kim, D. "Magnesium isotope separation by ion exchange using hydrous manganese(IV) oxide." Talanta 57, no. 4 (June 10, 2002): 701–5. http://dx.doi.org/10.1016/s0039-9140(02)00077-2.

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37

KIM, Dong Won, Young Kwan HONG, Nam-Soo LEE, Chang Suk KIM, Byeong Kwang JEON, and Byung Moo KANG. "Separation of Magnesium Isotopes by Chemical Exchange with Manganese (IV) Oxide." Journal of Nuclear Science and Technology 38, no. 9 (September 2001): 780–84. http://dx.doi.org/10.1080/18811248.2001.9715095.

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38

Rubira, Adley Forti, André Corréa da Costa, Fernando Galembeck, Nélia Ferreira Leite Escobar, Edson Correia da Silva, and Helion Vargas. "Polyethylene and polypropylene surface modification by impregnation with manganese (IV) oxide." Colloids and Surfaces 15 (January 1985): 63–73. http://dx.doi.org/10.1016/0166-6622(85)80056-1.

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39

Idris, Azeez O., Nonhlangabezo Mabuba, and Omotayo A. Arotiba. "Towards cancer diagnostics – an α-feto protein electrochemical immunosensor on a manganese(iv) oxide/gold nanocomposite immobilisation layer." RSC Advances 8, no. 54 (2018): 30683–91. http://dx.doi.org/10.1039/c8ra06135a.

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A novel electrochemical immunosensor for the quantification of α-feto protein (AFP) using a nanocomposite of manganese(iv) oxide nanorods (MnO₂NRs) and gold nanoparticles (AuNPs) as the immobilisation layer is presented.

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40

Sokolsky, Georgii V., Sergii V. Ivanov, Eudgene I. Boldyrev, Natalya D. Ivanova, and Tatyana F. Lobunets. "Li⁺-Doping-Induced Changes of Phase Composition in Electrodeposited Manganese(IV) Oxide Materials." Solid State Phenomena 230 (June 2015): 85–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.230.85.

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The impact of Li+dopant-ions in fluorine-containing electrolytes on electrodeposited manganese (IV) oxide material was under investigation in this paper. The dependence of phase composition of this material at Li+-concentration range in the electrolyte below the stoichiometric content of lithium in hollandite A2Mn8O16(Mn:Li ≈ 4:1) was established. The hollandite phase stabilization as a template effect caused by Li+-ions is gradually reduced with the Li+concentration growth from 0.025 to 0.15mol∙L-1LiOH concentration range. The hollandite content sharply drops at close to the stoichiometric Mn:Li ratio for the hollandite phase. In contrary, the concentration of cation-deficient ε-MnO2becomes significant. Thus, the template effect of Li+cations at electrolytic doping from fluorine-containing electrolytes consists of stabilization of the hollandite tunnels at longer distance with the size of coherent scattering regions of this phase more than of about 20—50 Å comparing with undoped materials. It is supposed that Li+-ions presence makes tunnel space unavailable unlike water molecules or ammonium cations. Therefore, to realise molecular sieves based on manganese (IV) oxides the availability of tunnels should be taken into account.

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41

SUGAWARA, M., M. OHNO, and K. MATSUKI. "ChemInform Abstract: Novel Preparation Method of Manganese(II) Manganese(IV) Oxide ( Mn2Mn3O8, Mn5O8) by Citrate Process." ChemInform 23, no. 3 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199203030.

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42

Zhang, Tengfei, Lihu Liu, Wenfeng Tan, Steven L. Suib, and Guohong Qiu. "Formation and transformation of manganese(III) intermediates in the photochemical generation of manganese(IV) oxide minerals." Chemosphere 262 (January 2021): 128082. http://dx.doi.org/10.1016/j.chemosphere.2020.128082.

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43

Zhang, Bang-Lu, Chang-Le Wang, Leslie J. Robbins, Lian-Chang Zhang, Kurt O. Konhauser, Zhi-Guo Dong, Wen-Jun Li, Zi-Dong Peng, and Meng-Tian Zheng. "Petrography and Geochemistry of the Carboniferous Ortokarnash Manganese Deposit in the Western Kunlun Mountains, Xinjiang Province, China: Implications for the Depositional Environment and the Origin of Mineralization." Economic Geology 115, no. 7 (November 1, 2020): 1559–88. http://dx.doi.org/10.5382/econgeo.4729.

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Abstract The Upper Carboniferous Ortokarnash manganese ore deposit in the West Kunlun orogenic belt of the Xinjiang province in China is hosted in the Kalaatehe Formation. The latter is composed of three members: (1) the 1st Member is a volcanic breccia limestone, (2) the 2nd Member is a sandy limestone, and (3) the 3rd Member is a dark gray to black marlstone containing the manganese carbonate mineralization, which, in turn, is overlain by sandy and micritic limestone. This sequence represents a single transgression-regression cycle, with the manganese deposition occurring during the highstand systems tract. Geochemical features of the rare earth elements (REE+Y) in the Kalaatehe Formation suggest that both the manganese ore and associated rocks were generally deposited under an oxic water column with Post-Archean Australian Shale (PAAS)-normalized REE+Y patterns displaying characteristics of modern seawater (e.g., light REE depletion and negative Ce anomalies). The manganese ore is dominated by fine-grained rhodochrosite (MnCO3), dispersed in Mn-rich silicates (e.g., friedelite and chlorite), and trace quantities of alabandite (MnS) and pyrolusite (MnO2). The replacement of pyrolusite by rhodochrosite suggests that the initial manganese precipitates were Mn(IV)-oxides. Precipitation within an oxic water column is supported by shale-normalized REE+Y patterns from the carbonate ores that are characterized by large positive Ce (>3.0) anomalies, negative Y (~0.7) anomalies, low Y/Ho ratios (~20), and a lack of fractionation between the light and heavy rare earth elements ((Nd/Yb)PAAS ~0.9). The manganese carbonate ores are also 13C-depleted, further suggesting that the Mn(II) carbonates formed as a result of Mn(III/IV)-oxide reduction during burial diagenesis.

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44

Deivamani, D., and P. Perumal. "Improved Capacity of LiNi0.8Mn0.1Co0.1O2 Cathode upon Sn(IV) Doping by Facile Co-Precipitation Method." Asian Journal of Chemistry 32, no. 6 (2020): 1303–8. http://dx.doi.org/10.14233/ajchem.2020.22543.

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Nickel rich lithium nickel manganese cobalt oxide is one of the prominent cathode materials in the field of lithium ion battery. The cathode was prepared upon doping with Sn4+ by simple co-precipitation method to develop its discharge capacity. The structural and morphological studies on the cathode material were done by X-ray diffraction and scanning electron microscopy to confirm any structural changes upon doping of Sn4+. The higher discharge capacity of 210 mAh g-1 with 89% capacity retention was achieved even after 100 cycles at C/3 rate for 0.8 mol % Sn4+ doped lithium nickel manganese cobalt oxide. The structural phase change upon cycling for Sn4+ doped and un-doped cathode was illustrated by differential plot. The ionic radius and high bond stability of Sn4+ that compares Ni2+ might be the reason to prevent structural collapse during Li+ intercalation and de-intercalation process.

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Tamilarasan, S., Sourav Laha, S. Natarajan, and J. Gopalakrishnan. "Li2MnO3: a rare red-coloured manganese(iv) oxide exhibiting tunable red–yellow–green emission." Journal of Materials Chemistry C 3, no. 18 (2015): 4794–800. http://dx.doi.org/10.1039/c5tc00616c.

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Li₂MnO₃is a rare, red-coloured, Mn(iv) oxide that shows tunable red–yellow–green emission: both the red colour and the tunable emission likely arise from the honey-comb ordered LiMn₆units in the rock salt based layered structure of this oxide.

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46

Zhang, Wei, Caihong Liu, Tong Zheng, Jun Ma, Gaosheng Zhang, Guohui Ren, Lu Wang, and Yulei Liu. "Efficient oxidation and sorption of arsenite using a novel titanium(IV)-manganese(IV) binary oxide sorbent." Journal of Hazardous Materials 353 (July 2018): 410–20. http://dx.doi.org/10.1016/j.jhazmat.2018.04.034.

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47

Piotrowicz, Andrzej, and Stanisław Pietrzyk. "Dissolution of manganese (IV) oxide from tantalum capacitor scrap by organic acids." Acta Innovations, no. 32 (July 1, 2019): 63–77. http://dx.doi.org/10.32933/actainnovations.32.7.

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The dissolution of MnO2 from tantalum capacitor scrap using organic acids in various process conditions was studied. The initial materials were of two types: LTC (leaded tantalum capacitors) and SMDTC (surface-mounted device tantalum capacitors). The research materials were prepared by pyrolysis, grinding and sieving and the preparation processes were characterized. Dissolution of MnO2 was carried out with the use of sulfuric acid solutions with the addition of acetic, ascorbic, citric and oxalic organic acids. Results show that the addition of organic acids significantly improves dissolution yields (72-94 vs 90-99 % for H2SO4 and acid mixtures, respectively). In practice, a concentration of organic acid above 1 M results in the complete removal of MnO2.

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48

DIAMANTINI, G., E. DURANTI, and A. TONTINI. "ChemInform Abstract: Nitroisoxazoles by Manganese(IV) Oxide Oxidation of Nitro-4,5- dihydroisoxazoles." ChemInform 25, no. 15 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199415176.

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49

Herszage, Julián, and María dos Santos Afonso. "Mechanism of Hydrogen Sulfide Oxidation by Manganese(IV) Oxide in Aqueous Solutions." Langmuir 19, no. 23 (November 2003): 9684–92. http://dx.doi.org/10.1021/la034016p.

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50

Nilsen, Ola, Steinar Foss, Arne Kjekshus, and Helmer Fjellvåg. "Growth of Nano-Needles of Manganese(IV) Oxide by Atomic Layer Deposition." Journal of Nanoscience and Nanotechnology 8, no. 2 (February 1, 2008): 1003–11. http://dx.doi.org/10.1166/jnn.2008.037.

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Journal articles on the topic 'Manganese (IV) Oxide'

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