International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 2
·248-255
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IF 3.85
Ren Guoxing,Xiao Songwen,Liao Caibin,Liu Zhihong
As a part of the fundamental study related to the reduction smelting of spent lithium-ion batteries and ocean polymetallic nodules based on MnO-SiO 2 slags, this work investigated the activity coefficient of NiO in SiO 2 -saturated MnO-SiO 2 slag and Al 2 O 3 -saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K with controlled oxygen partial pressure levels of 10 −7 , 10 −6 , and 10 −5 Pa. Results showed that the solubility of nickel oxide in the slags increased with increasing oxygen partial pressure. The nickel in the MnO-SiO 2 slag and MnO-SiO 2 -Al 2 O 3 slag existed as NiO under experimental conditions. The addition of Al 2 O 3 in the MnO-SiO 2 slag decreased the dissolution of nickel in the slag and increased the activity coefficient of NiO. Furthermore, the activity coefficient of NiO ( γ NiO ), which is solid NiO, in the SiO 2 saturated MnO-SiO 2 slag and Al 2 O 3 saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K can be respectively calculated as γ NiO = 8.58 w (NiO) + 3.18 and γ NiO = 11.06 w (NiO) + 4.07, respectively, where w (NiO) is the NiO mass fraction in the slag.
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Energy Technology
·
2025
·
IF 3.6
Anping Tang,Zhixing Sui,Liping Ning
Lithium fluoride-transition metal oxide (LiF–TMO) composites have become an attractive alternative to the traditional intercalation-type cathodes due to their high specific capacity. However, current preparation methods of these composites are not suitable for large-scale production. Therefore, it is necessary to seek new methods for preparing these composites. In the present study, LiF–MnO composites are successfully prepared by a novel solid-state reaction method using polytetrafluoroethylene as a fluorinating agent. The X-ray diffraction patterns of the samples show that LiF–MnO composites without other fluoride impurities can be achieved by optimizing sintering temperature, sintering time, and the Poly(tetrafluoroethylene) contents in the precursor. In the voltage range of 1.5–4.8 V at C/20 rate, the composite delivers a first discharge specific capacity of 180 mAh g −1 and exhibits a fairly stable cycle life.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Guanfeng Tian,Youqing Wu,Shiyong Wu,Sheng Huang,Jinsheng Gao
Synthesizing methanol from CO 2 and green hydrogen is a promising strategy to solve environmental issues and meet the increasing energy demand. In this work, Pd/MnO/In 2 O 3 catalyst with highly dispersed Pd species was prepared via an in-situ reduction method using NaBH 4 as the reducing agent. The highly dispersed Pd species promoted the dissociative of hydrogen and the hydride species could spill over to the MnO/In 2 O 3 due to the strong metal-support interaction between Pd and MnO/In 2 O 3 , which improved the catalytic activity of Pd/MnO/In 2 O 3 for CO 2 hydrogenation to methanol. As a result, the methanol space-time yield of 1 wt% Pd/MnO/In 2 O 3 was 4.8 times higher than that of MnO/In 2 O 3 . Moreover, the methanol selectivity of 1 wt% Pd/MnO/In 2 O 3 was still higher than 70% at a temperature below 280 °C. The present in-situ reduction method is an effective route for the preparation of Pd/MnO/In 2 O 3 catalyst for CO2 hydrogenation to methanol.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Sihai Lv,Yongzhi Cheng,Fu Chen,Xiangcheng Li,Hui Luo
Exploring high-performance electromagnetic wave (EMW) absorbers remains a formidable challenge in the face of severe EMW radiation and interference. The incorporation of manganese oxide into carbon matrix magnetic composites is proposed to enhance the EMW absorption properties in this work. Multiple interfacial ternary-component Fe 3 C/MnO/Nitrogen-doped carbon (NC) absorbers were synthesized through facile hydrothermal, oxidative polymerization and carbothermal reduction processes. The results indicated that the composites designed exhibit excellent EMW absorption properties, with an effective absorption bandwidth of 4.88 GHz (13.12–18 GHz) at a mere thickness of 1.5 mm. The outstanding performance of EMW absorption can be attributed to the effective modulation of electromagnetic parameters through a large number of heterogeneous interfaces, defects, and magnetic loss. Meanwhile, adjusting the filling ratios of the composites in the absorber also can significantly adjust the electromagnetic parameters of the samples. This work presents effective approach for the preparation of high-performance EMW absorbers with ternary components, as well as a strategy for developing novel broadband absorbers that are lightweight and have thin thickness.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chao Zhang,Yi Wang,Yi-Lin Liu,Qingming Zeng,Yanjun Wen,Lulin Guo,Haodong Chen,Xinyi Xie,Qingyi Zeng
An innovative MnO/Ti 3 C 2 MXene heterostructure, consisting of three-dimensional (3D) MnO nanosheet array directly assembled on two-dimensional (2D) Ti 3 C 2 MXene nanosheets, was synthesized via a simple hydrothermal-annealing strategy for uranium elimination. This unique 3D/2D heterostructure derived substantially high specific surface area (311.9 m 2 /g) and exposed considerable amount of surface oxygen groups, including surface lattice M–O and adsorbed –OH. Through a comprehensive exploration encompassing adsorbent dosage, pH, ionic strength, initial U(VI) concentration, and environmental conditions, the MnO/Ti 3 C 2 MXene heterostructure demonstrated an extraordinary proficiency and specificity in the removal of U(VI). This composite exhibited an outstanding adsorption capacity of 862.1 mg/g, with a removal efficiency of 99.7 % and rapid kinetics (above 90 % within 20 s). The kinetic study indicated the adsorption process followed chemisorption dynamics and single-layer adsorption behavior. Comprehensive analyses validated the structural integrity and confirmed the successful uranium adsorption via strong interaction between UO 2 2+ and surface unsaturated oxygen groups. Notably, the MnO/Ti 3 C 2 MXene maintained excellent recyclability, highlighting its potential for large-scale applications. It emerges as a promising candidate for uranium removal, offering insights for optimizing composite materials in diverse environmental conditions and fostering advancements in water purification technologies.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Yuanyuan Li,Li Tang,Dongmei Deng,Haibo He,Xiaoxia Yan,Jinhua Wang,Liqiang Luo
The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-Mn 3 O 4 microparticles wrapped by reduced graphene oxide (MnO-Mn 3 O 4 @rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-Mn 3 O 4 @rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-Mn 3 O 4 @rGO exhibited prominent catalyzing effect on the electroreduction of H 2 O 2 , due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and Mn 3 O 4 . The MnO-Mn 3 O 4 @rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM −1 cm −2 . The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting H 2 O 2 in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.
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PubMed
高影响因子
Advanced Science
·
2018
·Vol. 6
·期 1
·1801182
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IF 12.441
Zao Wang,Feng Gong,Ling Zhang,Rui Wang,Lei Ji,Qian Liu,Yonglan Luo,Haoran Guo,Yuehui Li,Peng Gao,Xifeng Shi,Baihai Li,Bo Tang,Xuping Sun
NH 3 is a valuable chemical with a wide range of applications, but the conventional Haber–Bosch process for industrial-scale NH 3 production is highly energy-intensive with serious greenhouse gas emission. Electrochemical reduction offers an environmentally benign and sustainable route to convert N 2 to NH 3 at ambient conditions, but its efficiency depends greatly on identifying earth-abundant catalysts with high activity for the N 2 reduction reaction. Here, it is reported that MnO particles act as a highly active catalyst for electrocatalytic hydrogenation of N 2 to NH 3 with excellent selectivity. In 0.1 m Na 2 SO 4 , this catalyst achieves a high Faradaic efficiency up to 8.02% and a NH 3 yield of 1.11 × 10 −10 mol s −1 cm −2 at −0.39 V versus reversible hydrogen electrode, with great electrochemical and structural stability. On the basis of density functional theory calculations, MnO (200) surface has a smaller adsorption energy toward N than that of H with the *N 2 → *N 2 H transformation being the potential-determining step in the nitrogen reduction reaction.
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高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Yi Yu,Jian Ji,Kai Li,Haibao Huang,Rajendra P. Shrestha,Nguyen Thi Kim Oanh,Ekbordin Winijkul,Jiguang Deng
MnO nanoparticles supported on coal-based activated carbon (AC) were facilely fabricated via incipient wetness impregnation method by calcination of manganese acetate in nitrogen. The as-prepared catalysts were characterized by N 2 adsorption-desorption, XRD, TEM, and XPS. It is demonstrated that calcination under inert atmosphere can facilely obtain well dispersed MnO nanoparticles on AC, and the particle size, as well as the surface oxygen species of the catalysts strongly depended on the calcination temperature. The AC supported MnO nanoparticles all exhibited high catalytic activity toward ozone decomposition at room temperature, and an optimal one was displayed as the calcination temperature of 700 °C. The smallest particle size of MnO nanoparticles and the most amount of surface oxygen vacancies, were mainly responsible for the highest activity of MnO/AC-700. Moreover, lower loading of Mn was found to be more favorable for stable catalytic performance. This work reported a series of MnO based catalysts for efficient removal of ozone at room temperature for the first time, and may shed new lights on the design of manganese oxides with lower oxidation state for efficient ozone decomposition.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhuoyang Li,Yang Zhang,Guishang Pei,Mengjiao Jiao,Xuewei Lv
MnV 2 O 6 and Mn 2 V 2 O 7 are essential compounds in the manganese salt roasting process for extracting vanadium and serve as excellent battery materials. Determining their thermodynamic properties is of significant theoretical and practical importance. In this study, MnV 2 O 6 and Mn 2 V 2 O 7 were synthesized through solid-state synthesis under a nitrogen atmosphere, and their crystal structures were analyzed using X-ray powder diffraction. The heat capacity of MnV 2 O 6 and Mn 2 V 2 O 7 were measured using relaxation calorimetry over the temperature range of 2–300 K. The entropy at 298.15 K, including magnetic contributions, was calculated as 178.99 ± 5.35 J K -1 ·mol -1 for MnV 2 O 6 and Mn 2 V 2 O 7 for 258.93 ± 6.47 J K -1 ·mol -1 . The standard molar enthalpies of formation were determined using high-temperature solution calorimetry in a molten lead borate solvent, yielding -1997.09 ± 23.97 for MnV 2 O 6 and -2427.71 ± 29.12 kJ mol -1 for Mn 2 V 2 O 7 from their element references. Based on these reliable experimental data, other thermodynamic properties, including enthalpy changes, entropy, and Gibbs free energy, were calculated. Finally, thermodynamic simulations were conducted to analyze phase evolution during the manganese salt roasting process and to evaluate the water solubility of MnV 2 O 6 and Mn 2 V 2 O 7 .
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Nanomaterials
·
2022
·Vol. 12
·期 8
·1370
·
IF 5.719
Cong Tian,Zhe Tang,Yike Hou,Asim Mushtaq,Shafaq Naz,Zhangsen Yu,Jabeen Farheen,Muhammad Zubair Iqbal,Xiangdong Kong
Significant attention is paid to the design of magnetoplasmonic nanohybrids, which exploit synergistic properties for biomedical applications. Here, a facile method was employed to prepare plasmonic magnetic Au-MnO heterostructured hybrid nanoparticles for imaging-guided photothermal therapy of cancers in vitro, with the view to reducing the serious drawbacks of chemotherapy and gadolinium-based contrast agents. The biocompatibility of the prepared Au-MnO nanocomposites was further enhanced by Food and Drug Administration (FDA)-approved triblock copolymers Pluronic®F-127 and chitosan oligosaccharide (COS), with complementary support to enhance the absorption in the near-infrared (NIR) region. In addition, synthesized[email protected]nanocomposites exhibited promising contrast enhancement in T1MR imaging with a good r1relaxivity value (1.2 mM−1s−1), demonstrating a capable substitute to Gd-based toxic contrast agents. In addition, prepared[email protected]hybrid nanoparticles (HNPs) produced sufficient heat (62 °C at 200 μg/mL) to ablate cancerous cells upon 808 nm laser irradiation, inducing cell toxicity, and apoptosis. The promising diagnostic and photothermal therapeutic performance demonstrated the appropriateness of the[email protected]HNPs as a potential theranostic agent.Keywords:plasmonic nanoparticles;magnetic nanocomposites;T Magnetic contrast agents;photothermal therapy;cancer theranostics
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高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Meng Gao,Xia Dong,Kedian Wang,Wenqiang Duan,Xiaomao Sun,Chenguang Zhu,Wenjun Wang
Graphene/metal oxide nanocomposites are one of the most ideal electrode materials for microsupercapacitors (MSCs). However, the efficient and simple synthesis of graphene/metal oxide nanocomposites and fabrication of microelectrodes for MSCs are a challenge. In this work, using graphene oxide/Mn(CH 3 COO) 2 as the precursor, an efficient and simple approach is proposed to simultaneously synthesize graphene/MnO nanocomposites and process interdigital electrodes for MSCs by one-step picosecond laser direct-writing. Here, the MnO nanoparticles that are evenly distributed on the surface of graphene can provide pseudocapacitance to enhance the specific capacitance of graphene/MnO nanocomposites. Specifically, graphene/MnO electrode exhibits a high specific capacitance of 470 mF cm −2 . Furthermore, based on graphene/MnO interdigital electrodes, the symmetric MSCs shows excellent electrochemical performance. The maximum area specific capacitance of MSCs with PVA/H 3 PO 4 gel electrolyte is 55 mF cm −2 . After 5000 cycles, the capacitance of the MSCs with PVA/H 3 PO 4 gel electrolyte retains about 96% of its initial capacitance. The maximum energy density of MSCs with PVA/H 3 PO 4 gel electrolyte is 4.89 μWh cm −2 , and its maximum power density is 0.72 mW cm −2 . Moreover, this approach also provides a way to synthesize other graphene/metal oxide nanocomposites for MSCs by one-step laser direct-writing.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Feng Luo,Zhimin Li,Jiyuan Chen,Yangxi Yan,Dongyan Zhang,Maolin Zhang,Yue Hao
BiFeO 3 –BaTiO 3 –based solid solutions are promising candidates for high–temperature piezoelectric devices because of their high Curie temperature ( T C ) and considerable electrical properties. Here, we reported an optimum composition of 0.7Bi(Fe 0.999 Mn 0.001 )O 3 –0.3BaTiO 3 ceramic with a large piezoelectric constant ( d 33 ) of 230 pC/N and a high T C of 505 °C, which was attributed to the intentional introducing of the ceramic with MnO and MnO 2 mixture. Furthermore, an in situ d 33 measurement was carried out, demonstrating excellent thermal stability for the 0.7Bi(Fe 0.999 Mn 0.001 )O 3 –0.3BaTiO 3 specimen. The d 33 remained above 200 pC/N in the temperature range of 25 °C–400 °C and its fluctuation was less than ± 15 %. It was determined that the high d 33 in the 0.7BiFe 0.999 Mn 0.001 )O 3 –0.3BaTiO 3 ceramic originated from a synergistic effect of rhombohedral distortion, intrinsic response, and ferroelectric order. The findings establish a solid correlation between electrical properties and phase/domain structure, and provide a novel approach to improve the piezoelectric properties for BiFeO 3 –BaTiO 3 –based ceramics.
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