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1. Efficient enrichment of low-grade refractory rhodochrosite by preconcentration-neutral suspension roasting-magnetic separation process

Author:
Yuan, Shuai; Zhou, Wentao; Han, Yuexin; Li, Yanjun
Source:
Powder technology 2020 v.361 pp. 529-539
ISSN:
0032-5910
Subject:
manganese; manganese carbonate; manganese monoxide,   etc   ; dissociation; growth models; magnetic separation; microstructure; rhodochrosite; roasting; thermal degradation; thermodynamics;     Show all 11 Subjects
Abstract:
... Low-grade refractory rhodochrosite ores are difficult to be utilized by traditional beneficiation process owing to their complex characteristics. In this study, preconcentration-neutral suspension roasting-magnetic separation process was firstly proposed, and the thermodynamics, kinetics, phase and microstructure evolution of mineral reaction during rhodochrosite roasting were systematically studi ...
DOI:
10.1016/j.powtec.2019.11.082

2. Quantification of synergistic, additive and antagonistic effects of aerosol components on total oxidative potential

Author:
Guo, Huibin; Fu, Haiyan; Jin, Lei; Huang, Sijing; Li, Xiang
Source:
Chemosphere 2020 v.252 pp. 126573
ISSN:
0045-6535
Subject:
manganese,   etc   ; aerosols; copper; iron; prediction; quinones;     Show all 6 Subjects
Abstract:
... The interaction-based oxidative potential (OPᵢₙₜ) represents the prediction of binary mixture effects distinguishing from linear additivity by including information on binary mixtures among PM components. The objective of this work is to develope a reliable estimate on the possible synergistic or antagonistic possibility of binary PM components and to quantify the combined effect. We firstly asses ...
DOI:
10.1016/j.chemosphere.2020.126573

3. Integrated Design of Hierarchical CoSnO₃@NC@MnO@NC Nanobox as Anode Material for Enhanced Lithium Storage Performance

Author:
Chen, Zhiwen; Fei, Siming; Wu, Chenghao; Xin, Peijun; Huang, Shoushuang; Selegård, Linnéa; Uvdal, Kajsa; Hu, Zhangjun
Source:
ACS applied materials & interfaces 2020 v.12 no.17 pp. 19768-19777
ISSN:
1944-8252
Subject:
manganese monoxide,   etc   ; anodes; carbon; lithium; lithium batteries;     Show all 5 Subjects
Abstract:
... Transition-metal oxides (TMOs) are potential candidates for anode materials of lithium-ion batteries (LIBs) due to their high theoretical capacity (∼1000 mA h/g) and enhanced safety from suppressing the formation of lithium dendrites. However, the poor electron conductivity and the large volume expansion during lithiation/delithiation processes are still the main hurdles for the practical usage of ...
DOI:
10.1021/acsami.9b22368

4. Critical Control of Highly Stable Nonstoichiometric Mn–Zn Ferrites with Outstanding Magnetic and Electromagnetic Performance for Gigahertz High-Frequency Applications

Author:
Yang, Yang; Liu, Lidong; Zhu, Hangfei; Bao, Nina; Ding, Jun; Chen, Jing; Yu, Kuai
Source:
ACS applied materials & interfaces 2020 v.12 no.14 pp. 16609-16619
ISSN:
1944-8252
Subject:
manganese,   etc   ; annealing; heat; magnetism; temperature; zinc;     Show all 6 Subjects
Abstract:
... Pristine nonstoichiometric Mn–Zn ferrites were synthesized using a facile “heating-up” method. A route for achieving very stable single-crystal spinel Mn–Zn ferrites with enhanced magnetic performance and Curie temperature was explored using annealing procedures, where the protective gas flow velocities, heating rates, and annealing temperatures were critical in determining the phase structures an ...
DOI:
10.1021/acsami.0c00920

5. MnO2 mediated sequential oxidation/olefination of alkyl-substituted heteroarenes with alcohols

Author:
Zhang, Chunyan; Li, Zehua; Fang, Yanchen; Jiang, Shaohua; Wang, Maorong; Zhang, Guoying
Source:
Tetrahedron 2020 v.76 no.11 pp. 130968
ISSN:
0040-4020
Subject:
manganese dioxide,   etc   ; air; alcohols; moieties; oxidants; oxidation;     Show all 6 Subjects
Abstract:
... A practical and efficient ligand-free MnO₂ mediated sequential oxidation and olefination has been developed for the facile synthesis of a broad range of unsaturated N-heteroazaarenes from simple alkyl-substituted heteroarenes and alcohols. The procedure tolerates a series of functional groups, such as methoxyl, chloro, bromo, iodo, vinyl, phenolic and hetero groups, providing the olefination produ ...
DOI:
10.1016/j.tet.2020.130968

6. Single-crystal investigation of the compound SmNi₅.₂Mn₆.₈

Author:
Belan, Bohdana; Kowalska, Dorota; Manyako, Mykola; Dzevenko, Mariya; Kalychak, Yaroslav
Source:
Zeitschrift für Naturforschung 2020 v.75 no.3 pp. 303-307
ISSN:
1865-7117
Subject:
manganese,   etc   ; X-ray diffraction; crystal structure; nickel;     Show all 4 Subjects
Abstract:
... The intermetallic compound SmNi₅.₂Mn₆.₈ was synthesized by arc-melting and its crystal structure has been determined using single-crystal X-ray diffraction data. The compound adopts the tetragonal structure type ThMn₁₂: space group I4/mmm, Pearson code tI26, Z = 2; a = 8.6528(3), c = 4.8635(3) Å; R1 = 0.0175, wR2 = 0.0372, 171 F² values, 17 refined variables. The two crystallographic positions 8f ...
DOI:
10.1515/znb-2019-0181

7. Mn-Doped Sr/Si(111)-(3 × 2) HCC Surfaces: Antiferromagnetic Semiconductors for Spintronic Applications

Author:
Chai, Jun-Shuai; Wang, Jian-Tao; Xu, Li-Fang
Source:
ACS applied materials & interfaces 2020 v.12 no.8 pp. 9918-9924
ISSN:
1944-8252
Subject:
manganese,   etc   ; ferrimagnetic materials; magnetism; semiconductors; silicon; strontium;     Show all 6 Subjects
Abstract:
... Manganese and manganese silicide as promising candidates for spintronic applications have attracted great interest in recent years. Here, we adopt Sr-induced Si(111)-(3 × 2) honeycomb-chain channel (HCC) surface as a template and perform a systematical study on the structural stability and magnetic and electronic properties of Mn-doped Sr/Si(111)-(3 × 2) HCC surfaces by ab initio calculations. Our ...
DOI:
10.1021/acsami.9b20294

8. Robust Ferroelectric Properties in (K,Na)NbO₃-Based Lead-Free Films via a Self-Assembled Nanocomposite Approach

Author:
Xu, Liqiang; Chen, Feng; Jin, Feng; Huang, Haoliang; Qu, Lili; Zhang, Kexuan; Zhang, Zixun; Gao, Guanyin; Lu, Yalin; Zhang, Fapei; Wang, Ke; Ma, Chao; Wu, Wenbin
Source:
ACS applied materials & interfaces 2020 v.12 no.4 pp. 4616-4624
ISSN:
1944-8252
Subject:
manganese dioxide,   etc   ; nanocomposites; temperature; thermal stability;     Show all 4 Subjects
Abstract:
... (K,Na)NbO₃-based lead-free ferroelectric materials are highly desired in modern electronic applications and have long been considered as a strong candidate for replacing (Pb,Zr)TiO₃, but most of them are deficient in large remnant polarization and decent thermal stability. Here, a unique lead-free 0.95(K₀.₄₉Na₀.₄₉Li₀.₀₂)(Nb₀.₈Ta₀.₂)O₃–0.05CaZrO₃ with 2 wt % MnO₂ addition (KNNLT-CZ-M) ferroelectric ...
DOI:
10.1021/acsami.9b20311

9. Removal behavior and mechanisms of Cd(II) by a novel MnS loaded functional biochar: Influence of oxygenation

Author:
Fan, Zixi; Zhang, Qian; Li, Meng; Sang, Wenjiao; Qiu, Yue; Wei, Xiaonan; Hao, Huiru
Source:
Journal of cleaner production 2020 v.256 pp. 120672
ISSN:
0959-6526
Subject:
manganese; manganese oxides,   etc   ; adsorption; biochar; bran; cadmium; cadmium sulfide; pH; redox potential; sorbents; temperature;     Show all 11 Subjects
Abstract:
... Porous functional biochar (fBC) from mill bran was fabricated and used as a supporting agent for loading manganese sulfide (MnS). The manganese sulfide loaded functional biochar (MnS-fBC) composite’s physicochemical properties and Cd(II) removal performance were examined. Various adsorption parameters such as pH, initial Cd(II) concentration, biochar dosage and temperature were adopted to examine ...
DOI:
10.1016/j.jclepro.2020.120672

10. Promotional effects of nitrogen doping on catalytic performance over manganese-containing semi-coke catalysts for the NH3-SCR at low temperatures

Author:
Yao, Lu; Liu, Qingcai; Mossin, Susanne; Nielsen, David; Kong, Ming; Jiang, Lijun; Yang, Jie; Ren, Shan; Wen, Juan
Source:
Journal of hazardous materials 2020 v.387 pp. 121704
ISSN:
0304-3894
Subject:
manganese; manganese oxides,   etc   ; Lewis acids; adsorption; ammonia; catalysts; catalytic activity; electrons; nitrates; nitrogen; oxidation; oxygen; temperature;     Show all 13 Subjects
Abstract:
... A series of nitrogen-doped MnOₓ/semi-coke catalysts were studied for low-temperature (LT) de-NOₓ performance in the NH₃-SCR reaction. Changes in morphology, structure, and surface chemistry of the semi-coke catalysts were systematically investigated to analyze the promotional effects of nitrogen doping on catalytic performance. The catalytic activity of ASC-10U10 Mn was found to be enhanced signif ...
DOI:
10.1016/j.jhazmat.2019.121704

11. An aqueous manganese–lead battery for large-scale energy storage

Author:
Huang, Jianhang; Yan, Lei; Bin, Duan; Dong, Xiaoli; Wang, Yonggang; Xia, Yongyao
Source:
Journal of materials chemistry A 2020 v.8 no.12 pp. 5959-5967
ISSN:
2050-7496
Subject:
manganese; manganese dioxide,   etc   ; anodes; batteries; cathodes; electrochemistry; electrolytes; energy density; freezing point; lead; temperature;     Show all 11 Subjects
Abstract:
... With the increase in interest in energy storage for grid applications, a rechargeable battery, as an efficient energy storage/conversion system, has been receiving great attention. However, its development has largely been stalled by the issues of high cost, safety and energy density. Here, we report an aqueous manganese–lead battery for large-scale energy storage, which involves the MnO₂/Mn²⁺ red ...
DOI:
10.1039/d0ta01484b

12. Surface coating of LiMn₂O₄ cathodes with garnet electrolytes for improving cycling stability of solid lithium batteries

Author:
Bi, Zhijie; Zhao, Ning; Ma, Lina; Shi, Chuan; Fu, Zhengqian; Xu, Fangfang; Guo, Xiangxin
Source:
Journal of materials chemistry A 2020 v.8 no.8 pp. 4252-4256
ISSN:
2050-7496
Subject:
manganese; manganese monoxide,   etc   ; anodes; cathodes; ceramics; coatings; electrolytes; lithium; lithium batteries; temperature;     Show all 10 Subjects
Abstract:
... Spinel lithium manganese oxide (LiMn₂O₄) is an attractive cathode material, and has advantages including low cost, environmental friendliness, and easy synthesis as well as shortcomings including inferior cycling stability at elevated temperatures above 55 °C. In this work, LiMn₂O₄ cathodes are coated with Li₆.₃₇₅La₃Zr₁.₃₇₅Nb₀.₆₂₅O₁₂ (LLZNO) electrolytes. Such cathodes in solid batteries consistin ...
DOI:
10.1039/c9ta11203k

13. Functioning Mechanism of the Secondary Aqueous Zn-β-MnO₂ Battery

Author:
Li, Longyan; Hoang, Tuan K. A.; Zhi, Jian; Han, Mei; Li, Shengkai; Chen, P.
Source:
ACS applied materials & interfaces 2020 v.12 no.11 pp. 12834-12846
ISSN:
1944-8252
Subject:
manganese; manganese dioxide,   etc   ; batteries; cathodes; electrochemistry; electroplating; energy; energy density; gases; ions; zinc;     Show all 11 Subjects
Abstract:
... Rechargeable aqueous Zn-MnO₂ batteries are a promising candidate for large-scale energy storage systems due to their outstanding advantages, such as high energy density, high safety, low cost, and environmental friendliness. Considering the controversies surrounding the mechanism of this battery containing a mildly acidic electrolyte, the electrochemical behavior of this type of battery using β-Mn ...
DOI:
10.1021/acsami.9b22758

14. Site Occupation and Luminescence of Novel Orange-Red Ca₃M₂Ge₃O₁₂:Mn²⁺,Mn⁴⁺ (M = Al, Ga) Phosphors

Author:
Dong, Langping; Zhang, Liang; Jia, Yongchao; Shao, Baiqi; Lü, Wei; Zhao, Shuang; You, Hongpeng
Source:
ACS sustainable chemistry & engineering 2020 v.8 no.8 pp. 3357-3366
ISSN:
2168-0485
Subject:
manganese; manganese dioxide,   etc   ; aluminum; calcium; color; gallium; ions; luminescence; red light;     Show all 9 Subjects
Abstract:
... Novel orange-red-emitting phosphors Ca₃M₂Ge₃O₁₂:Mn²⁺,Mn⁴⁺ (M = Al, Ga) with sufficient red light component were developed, and their lattice occupancy and luminescent properties of different color centers have been studied. In Ca₃M₂Ge₃O₁₂:Mn, the abnormal self-reduction of Mn⁴⁺ to Mn²⁺ occurs. The doped manganese ion (using MnO₂ as Mn source) occupies dodecahedron Ca²⁺ site forming Mn²⁺(I) color c ...
DOI:
10.1021/acssuschemeng.9b07281

15. Ni-Doped Layered Manganese Oxide as a Stable Cathode for Potassium-Ion Batteries

Author:
Bai, Peilai; Jiang, Kezhu; Zhang, Xueping; Xu, Jialu; Guo, Shaohua; Zhou, Haoshen
Source:
ACS applied materials & interfaces 2020 v.12 no.9 pp. 10490-10495
ISSN:
1944-8252
Subject:
manganese; manganese monoxide,   etc   ; X-ray diffraction; cathodes; diffusivity; ions; lithium batteries; nickel;     Show all 8 Subjects
Abstract:
... Potassium-ion batteries (PIBs) are one of the promising alternatives to lithium-ion batteries (LIBs). Layered potassium manganese oxides are more attractive as cathodes for PIBs due to their high capacity, low cost, and simple synthesis method but suffer from the Jahn–Teller effect of Mn³⁺ in material synthesis. Here, a layered P3-type K₀.₆₇Mn₀.₈₃Ni₀.₁₇O₂ material with a suppressed Jahn–Teller eff ...
DOI:
10.1021/acsami.9b22237

16. Highly efficient MnO2/reduced graphene oxide hydrogel motors for organic pollutants removal

Author:
Song, Laibo; Li, Chaoqing; Chen, Wei; Liu, Bo; Zhao, Yuandi
Source:
Journal of materials science 2020 v.55 no.5 pp. 1984-1995
ISSN:
0022-2461
Subject:
manganese dioxide; manganese monoxide,   etc   ; dyes; graphene; graphene oxide; hydrogels; nanocatalysts; nanosheets; pollutants; risk; surface area;     Show all 11 Subjects
Abstract:
... Self-propelled milli/micro/nanomotors have shown promising potential for achieving various on-demand tasks of biomedical and environmental applications. In order to increase motor propellant and/or cargo-loading capability, it is critical to design and fabricate novel multifunctional materials. Here, high surface area reduced graphene oxide hydrogel (rGH)-based motor incorporated with richly porou ...
DOI:
10.1007/s10853-019-04076-5

17. Pilot-scale study on enhanced carbothermal reduction of low-grade pyrolusite using microwave heating

Author:
Li, Kangqiang; Chen, Jin; Peng, Jinhui; Ruan, Roger; Srinivasakannan, C.; Chen, Guo
Source:
Powder technology 2020 v.360 pp. 846-854
ISSN:
0032-5910
Subject:
manganese dioxide; manganese monoxide,   etc   ; coal; energy conservation; iron; microwave treatment; particle size; powders; temperature;     Show all 9 Subjects
Abstract:
... Microwave heating through materials' dielectric loss endows energy saving and consumption reduction and production clean characteristics. Pilot-scale study was initiated to evaluate the enhanced effect of microwave heating on carbothermal reduction process of pyrolusite. Results indicated that carbothermal reduction process for low-grade pyrolusite was divided into three stages identified by tempe ...
DOI:
10.1016/j.powtec.2019.11.015

18. Mn(II) oxidation and manganese-oxide reduction on the decolorization of an azo dye

Author:
Shoiful, Ahmad; Kambara, Hiromi; Cao, Linh Thi Thuy; Matsushita, Shuji; Kindaichi, Tomonori; Aoi, Yoshiteru; Ozaki, Noriatsu; Ohashi, Akiyoshi
Source:
International biodeterioration & biodegradation 2020 v.146 pp. 104820
ISSN:
0964-8305
Subject:
manganese; manganese monoxide,   etc   ; Methanosaeta; aerobic conditions; anaerobic conditions; azo dyes; decolorization; methane; moieties; oxidation; polymers; secretion;     Show all 12 Subjects
Abstract:
... The development of biological processes for treating azo-dye-contaminated waters is an important objective. Herein, we investigated the effects of Mn(II) oxidation and manganese-oxide reduction on the removal of the azo dye, Bordeaux S (BS), under aerobic and anaerobic conditions using two reactors, one with installed abiotic-MnO2, and one devoid of abiotic-MnO2. Under aerobic conditions, very lit ...
DOI:
10.1016/j.ibiod.2019.104820

19. Environmentally-friendly bioleaching of manganese from pyrolusite: Performance and mechanisms

Author:
Lan, Jirong; Sun, Yan; Du, Yaguang; Du, Dongyun; Zhang, Tian C.; Li, Jia
Source:
Journal of cleaner production 2020 v.249 pp. 119354
ISSN:
0959-6526
Subject:
manganese; manganese dioxide; manganese monoxide,   etc   ; Microbacterium; bacteria; biofilm; bioleaching; chemical reactions; cost effectiveness; equipment; leaching; mixing; molasses; pH; sugars; temperature; wastes;     Show all 17 Subjects
Abstract:
... Currently, bioleaching of manganese (Mn) from Mn-poor ore (e.g. pyrolusite) is facing the challenges of low leaching efficiency and high cost of leachant and process operation. In this study, a new process was developed that uses Microbacterium trichothecenolyticum Y1 (bacteria Y1) and waste molasses to bioleach Mn from pyrolusite or pure MnO₂ (for comparison). Results indicate that the innovative ...
DOI:
10.1016/j.jclepro.2019.119354

20. Multi-metal nutrient restriction and crosstalk in metallostasis systems in microbial pathogens

Author:
Jordan, Matthew R; Wang, Jiefei; Capdevila, Daiana A; Giedroc, David P
Source:
Current opinion in microbiology 2020 v.55 pp. 17-25
ISSN:
1369-5274
Subject:
manganese,   etc   ; bacteria; catalytic activity; enzymes; immunity; pathogens; proteins; zinc;     Show all 8 Subjects
Abstract:
... Transition metals from manganese to zinc function as catalytic and structural cofactors for an amazing diversity of proteins and enzymes, and thus are essential for all forms of life. During infection, inflammatory host proteins limit the accessibility of multiple transition metals to invading pathogens in a process termed nutritional immunity. In order to respond to host-mediated metal starvation ...
DOI:
10.1016/j.mib.2020.01.010