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Journal articles on the topic 'Mn(II)'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Uhrecký, Róbert, Ján Moncoľ, Marian Koman, Ján Titiš, and Roman Boča. "Structure and magnetism of a Mn(iii)–Mn(ii)–Mn(ii)–Mn(iii) chain complex." Dalton Transactions 42, no. 26 (2013): 9490. http://dx.doi.org/10.1039/c3dt50940k.

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2

Besio, Roberta, Maria Camilla Baratto, Roberta Gioia, Enrico Monzani, Stefania Nicolis, Lucia Cucca, Antonella Profumo, et al. "A Mn(II)–Mn(II) center in human prolidase." Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics 1834, no. 1 (January 2013): 197–204. http://dx.doi.org/10.1016/j.bbapap.2012.09.008.

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3

Anderson, Kirsty M., Neil G. Connelly, Nicholas J. Goodwin, Gareth R. Lewis, Maria Teresa Moreno, A. Guy Orpen, and Andrew J. Wood. "Cyanide-bridged complexes with Sn(II)Mn(I), Sn(II)Mn(II), Sn(IV)Mn(I) and Sn(IV)Mn(II) oxidation states †." Journal of the Chemical Society, Dalton Transactions, no. 9 (2001): 1421–27. http://dx.doi.org/10.1039/b100721l.

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4

Mikuriya, Masahiro, Toshinori Fujii, Tadashi Tokii, and Asako Kawamori. "Synthesis and Characterization of Mononuclear (Mn(II) and Mn(III)) and Dinuclear (Mn(II)Mn(II) and Mn(II)Mn(III)) Complexes with 2,6-Bis[N-(2-pyridylethyl)iminomethyl]-4-methylphenol." Bulletin of the Chemical Society of Japan 66, no. 6 (June 1993): 1675–86. http://dx.doi.org/10.1246/bcsj.66.1675.

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5

Chang, Jianing, Yukinori Tani, Hirotaka Naitou, Naoyuki Miyata, and Haruhiko Seyama. "Fungal Mn oxides supporting Mn(II) oxidase activity as effective Mn(II) sequestering materials." Environmental Technology 34, no. 19 (October 2013): 2781–87. http://dx.doi.org/10.1080/09593330.2013.790066.

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6

Grinenko, V. V., M. N. Khrizanforov, S. O. Strekalova, V. V. Khrizanforova, K. V. Kholin, T. V. Gryaznova, and Y. H. Budnikova. "Electrooxidative phosphorylation of coumarins by bimetallic catalytic systems Ni(II)/Mn(II) or Co(II)/Mn(II)." Phosphorus, Sulfur, and Silicon and the Related Elements 191, no. 11-12 (August 23, 2016): 1660–61. http://dx.doi.org/10.1080/10426507.2016.1225062.

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7

Stamatatos, Theocharis C., and George Christou. "Mixed valency in polynuclear Mn II /Mn III , Mn III /Mn IV and Mn II /Mn III /Mn IV clusters: a foundation for high-spin molecules and single-molecule magnets." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1862 (September 7, 2007): 113–25. http://dx.doi.org/10.1098/rsta.2007.2144.

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Mixed-valent Mn/O dinuclear and polynuclear molecular compounds containing Mn III are almost without exception trapped valence. Large differences between the strengths of the exchange interactions within Mn II Mn III , Mn III Mn III and Mn III Mn IV pairs lead to situations where Mn III Mn IV interactions, the strongest of the three mentioned and antiferromagnetic in nature, dominate the intramolecular spin alignments in trinuclear and higher nuclearity mixed-valent complexes and often result in molecules that have large, and sometimes abnormally large, values of molecular spin ( S ). When coupled to a large molecular magnetoanisotropy of the easy-axis-type (negative zero-field splitting parameter, D ), also primarily resulting from individual Jahn–Teller distorted Mn III centres, such molecules will function as single-molecule magnets (molecular nanomagnets). Dissection of the structures and exchange interactions within a variety of mixed-valent Mn x cluster molecules with metal nuclearities of Mn 4 , Mn 12 and Mn 25 allows a ready rationalization of the observed S , D and overall magnetic properties in terms of competing antiferromagnetic exchange interactions within triangular subunits, resulting spin alignments and relative orientation of Mn III JT axes. Such an understanding has provided a stepping stone to the identification of a ‘magnetically soft’ Mn 25 cluster whose groundstate spin S value can be significantly altered by relatively minor structural perturbations. Such ‘spin tweaking’ has allowed this cluster to be obtained in three different forms with three different groundstate S values.

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8

Dangeti, Sandeepraja, Babak Roshani, Brian Rindall, Joyce M. McBeth, and Wonjae Chang. "Biofiltration field study for cold Fe(II)- and Mn(II)-rich groundwater: accelerated Mn(II) removal kinetics and cold-adapted Mn(II)-oxidizing microbial populations." Water Quality Research Journal 52, no. 4 (October 10, 2017): 229–42. http://dx.doi.org/10.2166/wqrj.2017.006.

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Abstract Removal of Mn(II) from Fe(II)- and Mn(II)-rich groundwater in cold regions is challenging, due to slow Mn(II) removal kinetics below 15 °C. This study demonstrated onset, acclimation, and acceleration of Mn(II) removal in a two-stage pilot-scale biofilter (Fe and Mn filters) at varying low on-site temperatures (8–14.8 °C). Mn(II) removal commenced at 8 °C in the Mn filter after Fe(II) removal. A shift in redox-pH conditions favored biological Mn(II) removal and Mn(II)-oxidizing bacteria increased. The Mn filter reached steady-state functioning after 97 days, exhibiting high removal efficiencies (97 ± 0.9%). Yet, first-order rate constants (k) for Mn(II) removal were low (10−6–10−5 min−1; t1/2 = ∼40 d). After consecutive backwashes and filter inoculation with backwashed sludge, k remarkably accelerated to 0.21 min−1 (t1/2 = 3.31 min at 11 ± 0.6 °C). The cold-adapted microbial consortium (51 genera), including Pseudomonas, Leptothrix, Flavobacterium, and Zoogloea, cultured from the field-aged biofilter rapidly produced biogenic Mn oxides at 8 °C, confirmed by electron paramagnetic resonance spectroscopy. Birnessite and pyrolusite detected by synchrotron-based powder X-ray diffraction, and a repetitive birnessite-like surface morphology on ripened filter materials, reflected autocatalytic oxidation. Shifting in k indicated the vertical progress of biofilter ripening, which was not limited by low temperature.

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9

Trojan, Miroslav, and Petra Šulcová. "Binary Cu(II)–Mn(II) cyclo-tetraphosphates." Dyes and Pigments 47, no. 3 (December 2000): 291–94. http://dx.doi.org/10.1016/s0143-7208(00)00086-3.

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10

García, A. Bernalte, M. A. Díaz Díez, F. J. García Barros, F. J. Higes Rolando, E. Sabio Rey, and C. Valenzuela Calahorro. "Systems Mn(II)/HGA and Mn(II)/BnGA: Isolation and characterization of solids." Journal of Inorganic Biochemistry 59, no. 2-3 (August 1995): 629. http://dx.doi.org/10.1016/0162-0134(95)97720-b.

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11

Pei, Yu, Yves Journaux, Olivier Kahn, Andrea Dei, and Dante Gatteschi. "A Mn II Cu II Mn II trinuclear species with an S= 9/2 ground state." Journal of the Chemical Society, Chemical Communications, no. 16 (1986): 1300. http://dx.doi.org/10.1039/c39860001300.

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12

Fursova, Elena, Galina Romanenko, Renad Sagdeev, and Victor Ovcharenko. "Mononuclear Mn(II), Co(II), and Cu(II) pivalates." Polyhedron 81 (October 2014): 27–31. http://dx.doi.org/10.1016/j.poly.2014.05.057.

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13

Mayans, Júlia, Mercé Font‐Bardia, Lorenzo Di Bari, Marcin Górecki, and Albert Escuer. "Chiral [Mn II Mn III 3 M′] (M′=Na I , Ca II , Mn II ) and [Mn II Mn III 6 Na I 2 ] Clusters Built from an Enantiomerically Pure Schiff Base: Synthetic, Chiroptical, and Magnetic Properties." Chemistry – A European Journal 24, no. 70 (November 15, 2018): 18705–17. http://dx.doi.org/10.1002/chem.201803730.

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14

Murray, Karen J., Samuel M. Webb, John R. Bargar, and Bradley M. Tebo. "Indirect Oxidation of Co(II) in the Presence of the Marine Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1." Applied and Environmental Microbiology 73, no. 21 (September 7, 2007): 6905–9. http://dx.doi.org/10.1128/aem.00971-07.

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ABSTRACT Cobalt(II) oxidation in aquatic environments has been shown to be linked to Mn(II) oxidation, a process primarily mediated by bacteria. This work examines the oxidation of Co(II) by the spore-forming marine Mn(II)-oxidizing bacterium Bacillus sp. strain SG-1, which enzymatically catalyzes the formation of reactive nanoparticulate Mn(IV) oxides. Preparations of these spores were incubated with radiotracers and various amounts of Co(II) and Mn(II), and the rates of Mn(II) and Co(II) oxidation were measured. Inhibition of Mn(II) oxidation by Co(II) and inhibition of Co(II) oxidation by Mn(II) were both found to be competitive. However, from both radiotracer experiments and X-ray spectroscopic measurements, no Co(II) oxidation occurred in the complete absence of Mn(II), suggesting that the Co(II) oxidation observed in these cultures is indirect and that a previous report of enzymatic Co(II) oxidation may have been due to very low levels of contaminating Mn. Our results indicate that the mechanism by which SG-1 oxidizes Co(II) is through the production of the reactive nanoparticulate Mn oxide.

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15

Shoiful, Ahmad, Taiki Ohta, Hiromi Kambara, Shuji Matsushita, Tomonori Kindaichi, Noriatsu Ozaki, Yoshiteru Aoi, Hiroyuki Imachi, and Akiyoshi Ohashi. "Multiple organic substrates support Mn(II) removal with enrichment of Mn(II)-oxidizing bacteria." Journal of Environmental Management 259 (April 2020): 109771. http://dx.doi.org/10.1016/j.jenvman.2019.109771.

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16

Sasaki, Keiko, M. Matsuda, T. Urata, Tsuyoshi Hirajima, and H. Konno. "Sorption of Co Ions on Biogenic Mn Oxides Produced by a Mn-Oxidizing Fungus, Paraconiothyrium sp.-like Strain." Advanced Materials Research 20-21 (July 2007): 607–10. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.607.

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Sorption of Co(II) on the biogenic Mn oxide produced by a Paraconiothyrium sp.-like strain was investigated. The biogenic Mn oxide, which was characterized to be poorly crystalline birnessite (Na4Mn(III) 6Mn(IV) 8O27 ·9H2O) bearing Mn(III) and Mn(IV) in the structure, showed approximately 6.0-fold higher efficiency for Co(II) sorption than a synthetic Mn oxide. XP-spectra of Co 2p for the biogenic and synthetic Mn oxides after Co(II) sorption indicate that Co was immobilized as Co(III) on the surface of Mn oxides, clearly suggesting that redox reaction occurs between Co(II) ions and each Mn oxides. The Co(II) ions would be initially sorbed on the vacant sites of the surface of biogenic Mn oxide, and then oxidized to Co(III) by neighbor Mn(III/IV) atoms to release Mn(II). For the synthetic Mn oxide, release of Mn(II) was negligibly small because the oxidant is only Mn(IV) in ramsdellite (γ-MnO2). The Mn(II) release from the biogenic Mn oxide during Co(II) adsorption would be not only from weakly bounded Mn(II), but also from redox reaction between Mn(III/IV) and Co(II) ions.

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17

Francis, Chris A., and Bradley M. Tebo. "cumA Multicopper Oxidase Genes from Diverse Mn(II)-Oxidizing and Non-Mn(II)-OxidizingPseudomonas Strains." Applied and Environmental Microbiology 67, no. 9 (September 1, 2001): 4272–78. http://dx.doi.org/10.1128/aem.67.9.4272-4278.2001.

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ABSTRACT A multicopper oxidase gene, cumA, required for Mn(II) oxidation was recently identified in Pseudomonas putida strain GB-1. In the present study, degenerate primers based on the putative copper-binding regions of the cumAgene product were used to PCR amplify cumA gene sequences from a variety of Pseudomonas strains, including both Mn(II)-oxidizing and non-Mn(II)-oxidizing strains. The presence of highly conserved cumA gene sequences in several apparently non-Mn(II)-oxidizing Pseudomonasstrains suggests that this gene may not be expressed, may not be sufficient alone to confer the ability to oxidize Mn(II), or may have an alternative function in these organisms. Phylogenetic analysis of both CumA and 16S rRNA sequences revealed similar topologies between the respective trees, including the presence of several distinct phylogenetic clusters. Overall, our results indicate that both thecumA gene and the capacity to oxidize Mn(II) occur in phylogenetically diverse Pseudomonas strains.

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18

Buhani, Buhani, and Suharso Suharso. "THE INFLUENCE OF pH TOWARDS MULTIPLE METAL ION ADSORPTION OF Cu(II), Zn(II), Mn(II), AND Fe(II) ON HUMIC ACID." Indonesian Journal of Chemistry 6, no. 1 (June 13, 2010): 43–46. http://dx.doi.org/10.22146/ijc.21771.

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Multiple metal ions adsorption of Cu(II), Zn(II), Mn(II) and Fe(II) on humic acid with a batch method has been carried out at pH interaction of 3, 5, and 6. Concentration of metal ions in solution before and after interaction was analyzed with Atomic Absorption Spectrophotometer (AAS). Result showed that adsorption multiple metal ions of Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid is optimum at pH 5. Adsorption energies of the multiple metal ions Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid at pH 3, 5, and 6 are around 35.0 - 37.6 kJ/mole. In general, capacity of competition adsorption of the multiple metal ions has an order as follows; Cu(II) < Fe(II) < Zn(II) < Mn(II). Keywords: Humic acid, adsorption, multiple metal

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19

Wildner, M. "Crystal Structure of Mn(II)Mn(III)2O(SeO3)3." Journal of Solid State Chemistry 113, no. 2 (December 1994): 252–56. http://dx.doi.org/10.1006/jssc.1994.1368.

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20

Santelli, Cara M., Samuel M. Webb, Alice C. Dohnalkova, and Colleen M. Hansel. "Diversity of Mn oxides produced by Mn(II)-oxidizing fungi." Geochimica et Cosmochimica Acta 75, no. 10 (May 2011): 2762–76. http://dx.doi.org/10.1016/j.gca.2011.02.022.

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21

Kitjanukit, Santisak, Kyohei Takamatsu, and Naoko Okibe. "Natural Attenuation of Mn(II) in Metal Refinery Wastewater: Microbial Community Structure Analysis and Isolation of a New Mn(II)-Oxidizing Bacterium Pseudomonas sp. SK3." Water 11, no. 3 (March 11, 2019): 507. http://dx.doi.org/10.3390/w11030507.

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Natural attenuation of Mn(II) was observed inside the metal refinery wastewater pipeline, accompanying dark brown-colored mineralization (mostly MnIVO2 with some MnIII2O3 and Fe2O3) on the inner pipe surface. The Mn-deposit hosted the bacterial community comprised of Hyphomicrobium sp. (22.1%), Magnetospirillum sp. (3.2%), Geobacter sp. (0.3%), Bacillus sp. (0.18%), Pseudomonas sp. (0.03%), and non-metal-metabolizing bacteria (74.2%). Culture enrichment of the Mn-deposit led to the isolation of a new heterotrophic Mn(II)-oxidizer Pseudomonas sp. SK3, with its closest relative Ps. resinovorans (with 98.4% 16S rRNA gene sequence identity), which was previously unknown as an Mn(II)-oxidizer. Oxidation of up to 100 mg/L Mn(II) was readily initiated and completed by isolate SK3, even in the presence of high contents of MgSO4 (a typical solute in metal refinery wastewaters). Additional Cu(II) facilitated Mn(II) oxidation by isolate SK3 (implying the involvement of multicopper oxidase enzyme), allowing a 2-fold greater Mn removal rate, compared to the well-studied Mn(II)-oxidizer Ps. putida MnB1. Poorly crystalline biogenic birnessite was formed by isolate SK3 via one-electron transfer oxidation, gradually raising the Mn AOS (average oxidation state) to 3.80 in 72 h. Together with its efficient in vitro Mn(II) oxidation behavior, a high Mn AOS level of 3.75 was observed with the pipeline Mn-deposit sample collected in situ. The overall results, including the microbial community structure analysis of the pipeline sample, suggest that the natural Mn(II) attenuation phenomenon was characterized by robust in situ activity of Mn(II) oxidizers (including strain SK3) for continuous generation of Mn(IV). This likely synergistically facilitated chemical Mn(II)/Mn(IV) synproportionation for effective Mn removal in the complex ecosystem established in this artificial pipeline structure. The potential utility of isolate SK3 is illustrated for further industrial application in metal refinery wastewater treatment processes.

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22

Ferenc, Wiesława, Dariusz Osypiuk, Jan Sarzyński, and Halina Głuchowska. "Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid." Eclética Química Journal 45, no. 3 (July 1, 2020): 12–27. http://dx.doi.org/10.26850/1678-4618eqj.v45.3.2020.p12-27.

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The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand (H2L=C13H12N2O5) formed by condensation reaction of isatin and glutamic acid were synthesized. Their physico-chemical properties were characterized using elemental analysis, XRF, XRD, FTIR, TG–DSC and TG–FTIR methods and magnetic measurements (Gouy’s and SQUID-VSM methods). The complexes were obtained in crystalline forms (monoclinic or triclinic) with the formulae: M(LH)2·nH2O for Mn(II), Ni(II) and Zn(II) and ML·nH2O for Co(II) and Cu(II), where LH=C13H11N2O5–, L-=C13H10N2O52–, n = 1 for Mn(II), Cu(II) and Zn(II), n = 2 for Co(II) and n = 3 for Ni(II). In air at 293–1173 K they decompose in three steps forming finally the oxides of the appropriate metals. The gaseous decomposition products were identified as: H2O, CO2, CO, hydrocarbons and N2O. The magnetic moment values for complexes (except Zn(II) complex) show their paramagnetic properties with the ferro- and antiferromagnetic interactions between central ions. The compounds of Mn(II) and Co(II) are high spin complexes with weak ligand field. In Co(II) and Cu(II) complexes two carboxylate groups take part in the metal ion coordination while in those of Mn(II), Ni(II) and Zn(II) only one carboxylate anion coordinates to central ion.

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23

Pilichos, Evangelos, Albert Escuer, Mercé Font‐Bardia, and Júlia Mayans. "Chiral Versus Non‐Chiral [Mn III 6 Mn II Na I ], [Mn III 6 Mn II 2 Na I 2 ] and [Mn III 3 Mn II Na I ] Clusters Derived from Schiff Bases or the Fight for Symmetry." Chemistry – A European Journal 26, no. 57 (September 11, 2020): 13053–62. http://dx.doi.org/10.1002/chem.202001656.

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24

van Albada, Gerard A., Aminou Mohamadou, Willem L. Driessen, René de Gelder, Stefania Tanase, and Jan Reedijk. "A dinuclear Mn(II) chloro-bridged compound with a weak ferromagnetic Mn–Mn interaction." Polyhedron 23, no. 15 (September 2004): 2387–91. http://dx.doi.org/10.1016/j.poly.2004.07.019.

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25

Kitjanukit, Santisak, Kyohei Takamatsu, Kenji Takeda, Satoshi Asano, and Naoko Okibe. "Manganese Removal from Metal Refinery Wastewater Using Mn(II)-Oxidizing Bacteria." Solid State Phenomena 262 (August 2017): 673–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.673.

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There is a growing interest in the use of Mn (II)-oxidizing bacteria to treat Mn-containing metal refinery wastewaters instead of using conventional chemical approaches since the former could reduce the cost of alkaline agents and oxidants to remove Mn (II) as Mn oxides at alkaline pH. The Mn level was found naturally dropped in the industrial metal refinery wastewater treatment system, where the formation of Mn-enriched sludge was apparent. This observation motived us to investigate the possible involvement of microbially mediated reactions. From the sludge sample, Pseudomonas sp. strain SK3 was successfully isolated and tested for its Mn (II)-oxidation characteristics. Strain SK3 completely removed 100 ppm Mn (II) within 42 hours as birnessite ((Na,Ca,K)0.6(MnIV, MnIII)2O4·1.5H2O) under optimized conditions. Copper ions were found to be an important factor in promoting Mn (II) oxidation. Changes in the Mn (IV)/Mn (III) ratio during bacterial Mn (II)-oxidation indicated the involvement of 2-step one-electron transfer reactions in the formation of biogenic birnessite with Mn (III) as intermediate. Characteristics of strain SK3 were compared with those of a well-known Mn (II)-oxidizing bacterium, Pseudomonas putida strain MnB1. Strain SK3 displayed more robust Mn (II) oxidation capabilities under several severe conditions, showing its ideal characteristics for use in the industrial water treatment process.

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26

Sobianowska-Turek, Agnieszka, Katarzyna Grudniewska, Paweł Maciejewski, and Małgorzata Gawlik-Kobylińska. "Removal of Zn(II) and Mn(II) by Ion Flotation from Aqueous Solutions Derived from Zn-C and Zn-Mn(II) Batteries Leaching." Energies 14, no. 5 (March 1, 2021): 1335. http://dx.doi.org/10.3390/en14051335.

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The Zn(II) and Mn(II) removal by an ion flotation process from model and real dilute aqueous solutions derived from waste batteries was studied in this work. The research aimed to determine optimal conditions for the removal of Zn(II) and Mn(II) from aqueous solutions after acidic leaching of Zn-C and Zn-Mn waste batteries. The ion flotation process was carried out at ambient temperature and atmospheric pressure. Two organic compounds used as collectors were applied, i.e., m-dodecylphosphoric acid 32 and m-tetradecylphosphoric 33 acid in the presence of a non-ionic foaming agent (Triton X-100, 29). It was found that both compounds can be used as collectors in the ion flotation for Zn(II) and Mn(II) removal process. Process parameters for Zn(II) and Mn(II) flotation have been established for collective or selective removal metals, e.g., good selectivity coefficients equal to 29.2 for Zn(II) over Mn(II) was achieved for a 10 min process using collector 32 in the presence of foaming agent 29 at pH = 9.0.

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27

Geszvain, Kati, Logan Smesrud, and Bradley M. Tebo. "Identification of a Third Mn(II) Oxidase Enzyme in Pseudomonas putida GB-1." Applied and Environmental Microbiology 82, no. 13 (April 15, 2016): 3774–82. http://dx.doi.org/10.1128/aem.00046-16.

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ABSTRACTThe oxidation of soluble Mn(II) to insoluble Mn(IV) is a widespread bacterial activity found in a diverse array of microbes. In the Mn(II)-oxidizing bacteriumPseudomonas putidaGB-1, two Mn(II) oxidase genes, namedmnxGandmcoA, were previously identified; each encodes a multicopper oxidase (MCO)-type enzyme. Expression of these two genes is positively regulated by the response regulator MnxR. Preliminary investigation into putative additional regulatory pathways suggested that the flagellar regulators FleN and FleQ also regulate Mn(II) oxidase activity; however, it also revealed the presence of a third, previously uncharacterized Mn(II) oxidase activity inP. putidaGB-1. A strain from which both of the Mn(II) oxidase genes andfleQwere deleted exhibited low levels of Mn(II) oxidase activity. The enzyme responsible was genetically and biochemically identified as an animal heme peroxidase (AHP) with domain and sequence similarity to the previously identified Mn(II) oxidase MopA. In the ΔfleQstrain,P. putidaGB-1 MopA is overexpressed and secreted from the cell, where it actively oxidizes Mn. Thus, deletion offleQunmasked a third Mn(II) oxidase activity in this strain. These results provide an example of an Mn(II)-oxidizing bacterium utilizing both MCO and AHP enzymes.IMPORTANCEThe identity of the Mn(II) oxidase enzyme inPseudomonas putidaGB-1 has been a long-standing question in the field of bacterial Mn(II) oxidation. In the current work, we demonstrate thatP. putidaGB-1 employs both the multicopper oxidase- and animal heme peroxidase-mediated pathways for the oxidation of Mn(II), rendering this model organism relevant to the study of both types of Mn(II) oxidase enzymes. The presence of three oxidase enzymes inP. putidaGB-1 deepens the mystery of why microorganisms oxidize Mn(II) while providing the field with the tools necessary to address this question. The initial identification of MopA as a Mn(II) oxidase in this strain required the deletion of FleQ, a regulator involved in both flagellum synthesis and biofilm synthesis inPseudomonas aeruginosa. Therefore, these results are also an important step toward understanding the regulation of Mn(II) oxidation.

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28

Journal, Baghdad Science. "sw uobaghdad edu iqSynthesis and Characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes with Symmetrical Schiff base." Baghdad Science Journal 10, no. 3 (September 1, 2013): 618–26. http://dx.doi.org/10.21123/bsj.10.3.618-626.

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New binuclear Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes of N2S2 tetradentate or N4S2 hexadentate symmetric Schiff base were prepared by the condensation of butane-1,4-diylbis(2-amino ethylcarbamodithioate) with 3-acetyl pyridine. The complexes having the general formula [M2LCl4] (where L=butane-1,4-diyl bis (2-(z)-1-(pyridine-3-ylethylidene amino))ethyl carbamodithioate, M= Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II)), were prepared by the reaction of the mentioned metal salts and the ligand. The resulting binuclear complexes were characterized by molar conductance, magnetic susceptibility ,infrared and electronic spectral measurements. This study indicated that Mn(II), Ni(II) and Cu(II) complexes have octahedral geometry, while Co(II) Zn(II) and Hg(II) complexes are proposed to be tetrahedral structure .K

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29

Ferenc, Wieslawa, Agnieszka Walków-Dziewulska, and Jan Sarzynski. "Physicochemical properties of 3, 4, 5–trimethoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)." Journal of the Serbian Chemical Society 70, no. 8-9 (2005): 1075–88. http://dx.doi.org/10.2298/jsc0509075f.

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The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with 3,4,5-trimethoxybenzoic acid anion of the formula: M(C10H11O5)2.nH2O, where n = 6 for Ni(II), n = 1 for Mn(II), Co(II), Cu(II), and n = 0 for Zn, have been synthesized and characterized by elemental analysis, IR spectroscopy X?ray diffraction measurements, thermogravimetry and magnetic studies. They are crystalline compounds characterized by various symmetry. They decompose in various ways when heated in air to 1273 K. At first, they dehydrate in one step and form anhydrous salts. The final products of decomposition are oxides of the respective metals (Mn2O3, Co3O4, NiO, CuO, ZnO). The solubilities of the analysed complexes in water at 293 K are in the orders of 10-2 ? 10-4 mol dm-3. The magnetic susceptibilities of the Mn(II), Co(II), Ni(II) and Cu(II) complexes were measured over the range of 76?303 K and the magnetic moments were calculated. The results show that the 3,4,5-trimethoxybenzoates of Mn(II), Co(II) and Ni(II) are high-spin complexes but that of Cu(II) forms a dimer [Cu2(C10H11O5)4(H2O)2]. The carboxylate groups bind as monodentate or bidentate chelating or bridging ligands.

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30

Celik, Derya, and Muhammet Kose. "Triazine based Mn (II) and Mn (II)/Ln (III) complexes: Synthesis, characterization and catecholase activities." Applied Organometallic Chemistry 33, no. 2 (December 3, 2018): e4721. http://dx.doi.org/10.1002/aoc.4721.

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31

Francis, Chris A., Edgie-Mark Co, and Bradley M. Tebo. "Enzymatic Manganese(II) Oxidation by a Marine α-Proteobacterium." Applied and Environmental Microbiology 67, no. 9 (September 1, 2001): 4024–29. http://dx.doi.org/10.1128/aem.67.9.4024-4029.2001.

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ABSTRACT A yellow-pigmented marine bacterium, designated strain SD-21, was isolated from surface sediments of San Diego Bay, San Diego, Calif., based on its ability to oxidize soluble Mn(II) to insoluble Mn(III, IV) oxides. 16S rRNA analysis revealed that this organism was most closely related to members of the genus Erythrobacter, aerobic anoxygenic phototrophic bacteria within the α-4 subgroup of theProteobacteria (α-4 Proteobacteria). SD-21, however, has a number of distinguishing phenotypic features relative to Erythrobacter species, including the ability to oxidize Mn(II). During the logarithmic phase of growth, this organism produces Mn(II)-oxidizing factors of ≈250 and 150 kDa that are heat labile and inhibited by both azide ando-phenanthroline, suggesting the involvement of a metalloenzyme. Although the expression of the Mn(II) oxidase was not dependent on the presence of Mn(II), higher overall growth yields were reached in cultures incubated with Mn(II) in the culture medium. In addition, the rate of Mn(II) oxidation appeared to be slower in cultures grown in the light. This is the first report of Mn(II) oxidation within the α-4 Proteobacteria as well as the first Mn(II)-oxidizing proteins identified in a marine gram-negative bacterium.

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Wang, Wenming, Zongze Shao, Yanjun Liu, and Gejiao Wang. "Removal of multi-heavy metals using biogenic manganese oxides generated by a deep-sea sedimentary bacterium – Brachybacterium sp. strain Mn32." Microbiology 155, no. 6 (June 1, 2009): 1989–96. http://dx.doi.org/10.1099/mic.0.024141-0.

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A deep-sea manganese-oxidizing bacterium, Brachybacterium sp. strain Mn32, showed high Mn(II) resistance (MIC 55 mM) and Mn(II)-oxidizing/removing abilities. Strain Mn32 removed Mn(II) by two pathways: (1) oxidizing soluble Mn(II) to insoluble biogenic Mn oxides – birnessite (δ-MnO2 group) and manganite (γ-MnOOH); (2) the biogenic Mn oxides further adsorb more Mn(II) from the culture. The generated biogenic Mn oxides surround the cell surfaces of strain Mn32 and provide a high capacity to adsorb Zn(II) and Ni(II). Mn(II) oxidation by strain Mn32 was inhibited by both sodium azide and o-phenanthroline, suggesting the involvement of a metalloenzyme which was induced by Mn(II). X-ray diffraction analysis showed that the crystal structures of the biogenic Mn oxides were different from those of commercial pyrolusite (β-MnO2 group) and fresh chemically synthesized vernadite (δ-MnO2 group). The biogenic Mn oxides generated by strain Mn32 showed two to three times higher Zn(II) and Ni(II) adsorption abilities than commercial and fresh synthetic MnO2. The crystal structure and the biogenic MnO2 types may be important factors for the high heavy metal adsorption ability of strain Mn32. This study provides potential applications of a new marine Mn(II)-oxidizing bacterium in heavy metal bioremediation and increases our basic knowledge of microbial manganese oxidation mechanisms.

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33

Kamarudzaman, Ain Nihla, Tay Chia Chay, Amnorzahira Amir, and Suhaimi Abdul Talib. "Mn(II) Ions Biosorption from Aqueous Solution Using Pleurotus Spent Mushroom Compost under Batch Experiment." Applied Mechanics and Materials 773-774 (July 2015): 1101–5. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1101.

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The Pleurotus spent mushroom compost was selected as biosorbent to sorption Mn(II) ions. The Mn(II) ions biosorption was investigated under batch experiments. The influences of pH, contact time and initial Mn(II) concentration were also investigated. The optimum Mn(II) ions biosorption was achieved at pH 6, 20 minutes of contact time and 10 mg/L of initial Mn(II) concentration using 1.0 g biosorbent dosage. The Mn(II) ions biosorption experimental data were best described by the Langmuir isotherm model and pseudo-second order kinetic model. As conclusion, the Pleurotus spent mushroom compost can be used to sorption the Mn(II) ions from the aqueous solution.

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34

El Gheriany, Iman A., Daniela Bocioaga, Anthony G. Hay, William C. Ghiorse, Michael L. Shuler, and Leonard W. Lion. "Iron Requirement for Mn(II) Oxidation by Leptothrix discophora SS-1." Applied and Environmental Microbiology 75, no. 5 (December 29, 2008): 1229–35. http://dx.doi.org/10.1128/aem.02291-08.

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ABSTRACT A common form of biocatalysis of Mn(II) oxidation results in the formation of biogenic Mn(III, IV) oxides and is a key reaction in the geochemical cycling of Mn. In this study, we grew the model Mn(II)-oxidizing bacterium Leptothrix discophora SS-1 in media with limited iron (0.1 μM iron/5.8 mM pyruvate) and sufficient iron (0.2 μM iron/5.8 mM pyruvate). The influence of iron on the rate of extracellular Mn(II) oxidation was evaluated. Cultures in which cell growth was limited by iron exhibited reduced abilities to oxidize Mn(II) compared to cultures in medium with sufficient iron. While the extracellular Mn(II)-oxidizing factor (MOF) is thought to be a putative multicopper oxidase, Mn(II) oxidation in the presence of zero added Cu(II) was detected and the decrease in the observed Mn(II) oxidation rate in iron-limited cultures was not relieved when the medium was supplemented with Cu(II). The decline of Mn(II) oxidation under iron-limited conditions was not accompanied by siderophore production and is unlikely to be an artifact of siderophore complex formation with Mn(III). The temporal variations in mofA gene transcript levels under conditions of limited and abundant iron were similar, indicating that iron limitation did not interfere with the transcription of the mofA gene. Our quantitative PCR results provide a step forward in understanding the regulation of Mn(II) oxidation. The mechanistic role of iron in Mn(II) oxidation is uncertain; the data are consistent with a direct requirement for iron as a component of the MOF or an indirect effect of iron resulting from the limitation of one of many cellular functions requiring iron.

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35

Soldatova, Alexandra V., Christine A. Romano, Lizhi Tao, Troy A. Stich, William H. Casey, R. David Britt, Bradley M. Tebo, and Thomas G. Spiro. "Mn(II) Oxidation by the Multicopper Oxidase Complex Mnx: A Coordinated Two-Stage Mn(II)/(III) and Mn(III)/(IV) Mechanism." Journal of the American Chemical Society 139, no. 33 (August 15, 2017): 11381–91. http://dx.doi.org/10.1021/jacs.7b02772.

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36

Tojo, Fuyumi, Ayumi Kitayama, Naoyuki Miyata, Kunihiro Okano, Jun Fukushima, Ryuichiro Suzuki, and Yukinori Tani. "Molecular Cloning and Heterologous Expression of Manganese(II)-Oxidizing Enzyme from Acremonium strictum Strain KR21-2." Catalysts 10, no. 6 (June 18, 2020): 686. http://dx.doi.org/10.3390/catal10060686.

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Diverse ascomycete fungi oxidize manganese(II) [Mn(II)] and produce Mn(III, IV) oxides in terrestrial and freshwater environments. Although multicopper oxidase (MCO) is considered to be a key catalyst in mediating Mn(II) oxidation in ascomycetes, the responsible gene and its product have not been identified. In this study, a gene, named mco1, encoding Mn(II)-oxidizing MCO from Acremonium strictum strain KR21-2 was cloned and heterologously expressed in the methylotrophic yeast Pichia pastoris. Based on the phylogenetic relationship, similarity of putative copper-binding motifs, and homology modeling, the gene product Mco1 was assigned to a bilirubin oxidase. Mature Mco1 was predicted to be composed of 565 amino acids with a molecular mass of 64.0 kDa. The recombinant enzyme oxidized Mn(II) to yield spherical Mn oxides, several micrometers in diameter. Zinc(II) ions added to the reaction mixture were incorporated by the Mn oxides at a Zn/Mn molar ratio of 0.36. The results suggested that Mco1 facilitates the growth of the micrometer-sized Mn oxides and affects metal sequestration through Mn(II) oxidation. This is the first report on heterologous expression and identification of the Mn(II) oxidase enzyme in Mn(II)-oxidizing ascomycetes. The cell-free, homogenous catalytic system with recombinant Mco1 could be useful for understanding Mn biomineralization by ascomycetes and the sequestration of metal ions in the environment

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37

Reda, M. "Homogeneous Catalytic Oxidation of Aqueous Sulfur(IV) by Transition Metal Ions, Part III: Effect of Iron(III), Copper(II) and Manganese(II) and Synergistic Catalysis." Water Science and Technology 20, no. 10 (October 1, 1988): 45–47. http://dx.doi.org/10.2166/wst.1988.0122.

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The general effects of Fe(III), Cu(II) and Mn(II) on the homogeneous catalytic auto-oxidation of aqueous sulfur(IV) were investigated. The results indicated that Fe(III) and Mn(II) are effective catalysts, and Cu(II) has a slight catalytic effect compared with distilled water. The apparent synergisms existing between Mn(II) and Cu(II), Mn(II) and Fe(III), and Fe(III) and Cu(II) were investigated.

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38

Su, Jun-feng, Dong-hui Liang, Ting-lin Huang, Ting-ting Lian, and Wen-dong Wang. "Mixed electron donor autotrophic denitrification processes for groundwater treatment by immobilized biological filters." Water Supply 17, no. 6 (April 25, 2017): 1673–81. http://dx.doi.org/10.2166/ws.2017.049.

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Abstract An immobilized biological filter (IBF) using Fe(II) and Mn(II) as mixed electron donors was evaluated for nitrate removal in groundwater. Results of the single factor experiments of strain SZ28 under the conditions of electron donor:electron acceptor ratio (1:2, 1.45:1, 3:1), Fe(II):Mn(II) ratio (1:9, 3:7, 5:5) demonstrated that the highest nitrate removal ratio was 100%, 49.6% (Mn(II)) and 100% (Fe(II)) under the conditions of electron donor:electron acceptor ratio of 3:1, Fe(II):Mn(II) ratio of 5:5. Mn(II) and Fe(II) as electron donor was tested for the effects on denitrification in the IBF reactor. Optimal conditions were obtained at an electron donor:electron acceptor ratio of 2:1, hydraulic retention time of 12 h and Fe(II):Mn(II) ratio of 5:5 with the highest removal ratio of nitrate-N (100%), Mn(II) (50.25%) and Fe(II) (99.2%). Results suggest that the optimal condition obtained from the IBF was feasible.

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39

ЗВЕЗДИНА, С. В., Н. В. ЧИЖОВА, and Н. Ж. МАМАРДАШВИЛИ. "СИНТЕЗ И СПЕКТРАЛЬНЫЕ СВОЙСТВА НЕСИММЕТРИЧНОЗАМЕЩЕННЫХ ОКТАЭТИЛПОРФИРИНАТОВ MN(II) И MN(III)." Журнал Органической Химии 56, no. 8 (August 1, 2020): 1211–21. http://dx.doi.org/10.31857/s0514749220080078.

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40

Sain, Amanda E., Ashley Griffin, and Andrea M. Dietrich. "Assessing taste and visual perception of Mn(II) and Mn(IV)." Journal - American Water Works Association 106, no. 1 (January 2014): E32—E40. http://dx.doi.org/10.5942/jawwa.2014.106.0003.

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41

Djeniže, S., S. Bukvić, A. Srećković, and Z. Nikolić. "The first measured Mn II and Mn III Stark broadening parameters." New Astronomy 11, no. 4 (January 2006): 256–61. http://dx.doi.org/10.1016/j.newast.2005.08.005.

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42

Reaney, Stephen H., Graham Bench, and Donald R. Smith. "Brain Accumulation and Toxicity of Mn(II) and Mn(III) Exposures." Toxicological Sciences 93, no. 1 (June 1, 2006): 114–24. http://dx.doi.org/10.1093/toxsci/kfl028.

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43

Magherusan, Adriana M., Subhasree Kal, Daniel N. Nelis, Lorna M. Doyle, Erik R. Farquhar, Lawrence Que, and Aidan R. McDonald. "A Mn II Mn III ‐Peroxide Complex Capable of Aldehyde Deformylation." Angewandte Chemie International Edition 58, no. 17 (March 27, 2019): 5718–22. http://dx.doi.org/10.1002/anie.201900717.

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44

Magherusan, Adriana M., Subhasree Kal, Daniel N. Nelis, Lorna M. Doyle, Erik R. Farquhar, Lawrence Que, and Aidan R. McDonald. "A Mn II Mn III ‐Peroxide Complex Capable of Aldehyde Deformylation." Angewandte Chemie 131, no. 17 (March 27, 2019): 5774–78. http://dx.doi.org/10.1002/ange.201900717.

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45

Chizhova, Natalya Vasil’evna, Olga Valentinovna Maltceva, Svetlana Veniaminovna Zvezdina, Nugzar Zhoraevich Mamardashvili, and Oscar Iosifovich Koifman. "Bromo-substituted Mn(II) and Mn(III)-tetraarylporphyrins: synthesis and properties." Journal of Coordination Chemistry 71, no. 19 (October 2, 2018): 3222–32. http://dx.doi.org/10.1080/00958972.2018.1519186.

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46

Aydin, S., N. Tufekci, S. Arayici, and I. Ozturk. "Catalytic effects of high Mn(IV) concentrations on Mn(II) oxidation." Water Science and Technology 42, no. 1-2 (July 1, 2000): 387–92. http://dx.doi.org/10.2166/wst.2000.0343.

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Manganese is one of the common constituents of impounded water and of many well waters. In public supplies, it causes difficulties such as staining of clothes, “black” residues on plumbing fixtures and incrustation of mains. In industrial supplies, it causes severe economic losses through discoloration of products, specks in finished paper, textile, food and beverage products, and reduction of pipeline carrying capacities. Manganese is not known to cause any health problems, and the above conditions are limited to existence of manganese content by 0.05 mg/l in drinking waters, and by 0.1 mg/l or less in industrial waters. The aim of this study, is the removal of manganese (II) by oxidation with atmospheric oxygen, and to precipitate as MnO2 (s), from the waters with high manganese content. The oxidation of manganese (II) is studied in batch reactors in which the concentrations of manganese (IV) was in the range 0–700 mg/l . A quadratic equation has been given to determine the catalytic reaction rate constant as a function of manganese (IV).

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47

Yiase, S. G., S. O. Adejo, and S. T. Iningev. "Manganese (II) and Cobalt (II) Acetylacetonates as Antimicrobial Agents." NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 1 (March 14, 2019): 176–85. http://dx.doi.org/10.46912/napas.43.

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Mn(II) and Co(II) complexes were prepared by reaction of the metal chlorides with acetylacetone in ammonical aqueous medium. The metal complexes were prepared in order to investigate their antimicrobial activity on some selected pathogens. The characterisation of the complexes was on the basis of various spectroscopic techniques like infrared and ultraviolet studies. The compounds were subjected to antimicrobial activity screening using serial broth dilution method. Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal/Fungicidal Concentration (MBC/MFC) were determined. Mn(II) complex has shown significantly both antibacterial and antifungal activity with a MIC of 1.25 μg/mL while Co(II) complex was noticeable for antifungal activity at the same concentration. Whereas Mn(II) acetylacetonate is a more potent bactericide while Co(II) acetylacetonate is a more potent fungicide, both with MBC/MFC value of 2.5 μg/mL. Antimicrobial agent of the ligand has enhanced on complexation with Mn(II) and Co(II) ions. Though, the potency of the prepared antibiotics on the tested microbes is less compared to the standard drugs (Ciprofloxacin and Fulcin).

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48

Deng, Hua, Qiuyan Li, Meijia Huang, Anyu Li, Junyu Zhang, Yafen Li, Shuangli Li, Caiyan Kang, and Weiming Mo. "Removal of Zn(II), Mn(II) and Cu(II) by adsorption onto banana stalk biochar: adsorption process and mechanisms." Water Science and Technology 82, no. 12 (November 10, 2020): 2962–74. http://dx.doi.org/10.2166/wst.2020.543.

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Abstract Low-cost banana stalk (Musa nana Lour.) biochar was prepared using oxygen-limited pyrolysis (at 500 °C and used), to remove heavy metal ions (including Zn(II), Mn(II) and Cu(II)) from aqueous solution. Adsorption experiments showed that the initial solution pH affected the ability of the biochar to adsorb heavy metal ions in single- and polymetal systems. Compared to Mn(II) and Zn(II), the biochar exhibited highly selective Cu(II) adsorption. The adsorption kinetics of all three metal ions followed the pseudo-second-order kinetic equation. The isotherm data demonstrated the Langmuir model fit for Zn(II), Mn(II) and Cu(II). The results showed that the chemical adsorption of single molecules was the main heavy metal removal mechanism. The maximum adsorption capacities (mg·g−1) were ranked as Cu(II) (134.88) > Mn(II) (109.10) > Zn(II) (108.10)) by the single-metal adsorption isotherms at 298 K. Moreover, characterization analysis was performed using Fourier transform infrared spectroscopy, the Brunauer-Emmett-Teller method, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results revealed that ion exchange was likely crucial in Mn(II) and Zn(II) removal, while C-O, O-H and C = O possibly were key to Cu(II) removal by complexing or other reactions.

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Srivastava, Vinay Kumar. "Bioinorganic Chemistry of Co (II) and Mn (II) Complexes." International Journal of Pharmaceutical Investigation 10, no. 3 (October 10, 2020): 268–72. http://dx.doi.org/10.5530/ijpi.2020.3.49.

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50

Ravikumar, R. V. S. S. N., N. Madhu, A. V. Chandrasekhar, B. J. Reddy, Y. P. Reddy, and P. S. Rao. "Cu(II), Mn(II) in tetragonal site in chrysocolla." Radiation Effects and Defects in Solids 143, no. 3 (January 1998): 263–72. http://dx.doi.org/10.1080/10420159808212966.

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