CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Jiuyu Chen,Zhiwen Liu,Zenghui Liu,Hao Wu,Chensheng Gao,Jiaqi Shi,Dingming Xue
Radioactive iodine ( 131 I and 129 I) produced by the development of nuclear energy poses a long-term threat to ecology and health. In this study, a series of Cu@Mn x Cu 10-x -C materials were synthesized using Mn x Cu 10-x -BTC as the precursor, followed by surface grinding with external copper salts and subsequent pyrolysis. The material achieved a uniform dispersion of high-density Cu 0 sites on the Mn-Cu carbon framework. The optimal material Cu@Mn 3 Cu 7 -C had saturated adsorption capacities of 346.6 mg/g and 1555.3 mg/g for iodide (I − ) and iodine (I 2 ) respectively, further improving under acidic and oxygen-rich conditions. In addition, it could maintain excellent I − adsorption performance in the presence of highly competitive anions, in actual water samples, and after high-dose γ-irradiation. Mechanism studies demonstrated that Cu 0 , as the reaction center, dominated the oxidation-adsorption of I − and the reduction and fixation of I 2 , while triiodide (I 3 − ) could be effectively eliminated through the [Cu → I 3 ] charge transfer complexation or disproportionation pathway. The Mn species cooperated with the Cu site through valence modulation and electron transfer. This study provides a material system and theoretical basis for the efficient removal of multiple iodine species in complex water bodies with high capacity, fast kinetics and good environmental adaptability.
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高影响因子
Journal of Materiomics
·
2026
·
IF 10.6
Xiao Ma,Zhihao Dong,Weichen Zhang,Ying Jiang,Xu Cheng,Limin Guo,Peiyao Zhao,Xiaohui Wang
Piezoelectric actuators are widely used industrial electronic devices. In recent years, driven by environmental concerns, lead-free piezoelectric materials, particularly KNN-based ceramics, have gained increasing attention. In this study, Mn-doped KNN piezoelectric ceramics were synthesized by the conventional solid-state reaction method and sintered in a reducing atmosphere. By employing a synergistic strategy involving defect dipoles and ferroelectric domain switching, a giant converse piezoelectric coefficient of 2676 pm/V and a strain of 0.67% are achieved in the KNNM ceramics under an electric field of 2.5 kV/mm. In our ceramic samples, no obvious strain enhancement attributable to electrobending is observed. The ceramic exhibits excellent thermal stability, with performance degradation of less than 10% from room temperature to 170 °C, and maintains favorable performance after 2 million fatigue cycles. Considering the combination of excellent piezoelectric properties, high temperature stability, superior fatigue resistance, and reduction resistance, KNNM ceramics are expected to facilitate the development of lead-free piezoelectric actuators compatible with base-metal internal electrodes.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Xuchun Chen,Guangliang Lin,Yuyu Deng,Pei Liu,Jieran Liu,Zhiqin Sun,Qing-Lun Wang,Ting Jin,Lifang Jiao
Layered sodium all-Mn-based oxide materials are confronted with irreversible dynamic structural degradation induced by [MnO 6 ] layers gliding and Jahn–Teller (J–T) distortion of high-spin Mn 3+ during cycling. Although conventional strategies often focus primarily on reducing Mn 3+ content in the pristine material, we reveal that such static valence control is insufficient to ensure long-term structural integrity. Instead, we demonstrate that dynamic structural regulation effectively decouples the Mn oxidation state changes from degradation pathways. By designing a P’2-type [Na 0.64 Zn 0.07 ]Mn 0.92 Cu 0.08 O 2 (NZMCO) cathode, which maintains the same initial Mn oxidation state as Na 0.67 MnO 2 (NMO), we achieve exceptional cycling stability via a hierarchical damping-like mechanism. The designed framework integrates two synergistic stabilization pathways: (i) intralayer coordination tuning by counterbalancing Mn─O bond anisotropy, and (ii) interlayer electrostatic shielding to alleviate gliding between adjacent [MnO 6 ] layers. This strategic configuration effectively alleviates lattice strain and stress accumulation, suppresses microcrack formation, and significantly reduces transition metal dissolution. Consequently, NZMCO delivers a high specific capacity of 194.95 mAh g −1 at 20 mA g −1 , retaining 87.53% of its initial capacity after 1500 cycles at 2000 mA g −1 . This work shifts the design paradigm from static Mn valence engineering toward dynamic structural adaptation, offering a sustainable pathway for all-Mn-based layered cathodes.
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PubMed
高影响因子
Nanoscale
·
2026
·
IF 5.2
Wenshuo Zhao,Yanzhe Zhang,Yong-Li Wang,Tong Wu,Yingying Zhang,Jingjing Sun,Xiangrong Liu,YONGJIE ZHAO
Fe-Mn based layered transition metal oxides are compelling candidates for sodium-ion cathodes owing to their high specific capacity and cost-effectiveness. However, their practical application is hampered by inherent challenges including the Jahn-Teller effect, lattice oxygen loss, transition metal dissolution. In this study, Al/Ti co-doped Na0.67Fe0.4Mn0.4Al0.1Ti0.1O2 (FM-AT) cathode is proposed and prepared. The introduction of Al/Ti, creating strong Al-O and Ti-O bonds, effectively stabilizes the lattice oxygen and elevates the reversibility of anionic redox reactions. Furthermore, the stability of the transition metal layer is effectively enhanced, suppressing transition metal dissolution and the P2-OP4 phase transition associated with TMO2 layer slippage at deep charge states. The FM-AT demonstrates excellent cycling stability, with a capacity of 137.1 mAh g-1 under 20 mA g-1 and a capacity retention of 85.5% after 50 cycles (55.7% for the pristine FM cathode). Even after 200 cycles under 200 mA g-1, a capacity retention of 72.1% is achieved (versus 20.9% for the FM). This work offers a novel method for enhancing the structural stability of iron-manganese based electrode and designing cost-effective, high-performance sodium ion cathodes.
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PubMed
高影响因子
Royal Society Open Science
·
2025
·Vol. 12
·期 11
·
IF 2.9
Omar Mirna,Omar Sarah,El-Subruiti Gehan M.,Attia Nour F.,Eltaweil Abdelazeem
With growing concerns over water pollution and depletion of freshwater resources, finding sustainable and cost-effective solutions for water treatment is crucial. This study introduces a novel MIL-53(Fe)/Mn-doped SrTiO3 (MIL-53(Fe)/Mn-STO) direct Z-scheme photocatalyst, designed to efficiently degrade organic contaminants in water. Specifically, the photocatalytic degradation of o-nitrophenol (ONP) was investigated under an Xe lamp. The MIL-53(Fe)/Mn-STO photocatalyst demonstrated a maximum removal efficiency of 97.75% within 90 min, with a rate constant (k) of 0.0374 min−1, outperforming the individual MIL-53(Fe) and Mn-STO photocatalysts. A comprehensive analysis of the material’s properties was conducted using Fourier transform Infrared spectroscopy, energy dispersive X-ray spectroscopy, scanning electron microscopy, diffuse reflectance spectroscopy and photoluminescence techniques, and the photocatalytic activity was evaluated under various conditions, including variations in pH, ONP concentration, catalyst dosage and the presence of inorganic anions. The improved photocatalytic activity of the MIL-53(Fe)/Mn-STO system can be ascribed to the synergistic interaction between its two components, which also contributed to its excellent recyclability over five cycles. These findings demonstrate that MIL-53(Fe)/Mn-STO is a highly effective and sustainable photocatalyst with a strong potential for wastewater treatment applications.
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PubMed
高影响因子
Journal of Hazardous Materials Advances
·
2026
·
IF 9.1
Beiping Zhang,Haixiang Sun,Kun Wang,Dawen Zha,Yankun Liu,Yuchao Tang,Xianhuai Huang
Ozone–activated carbon (O 3 /AC) systems are widely applied for the removal of soluble manganese (Mn(II)) in drinking water treatment. However, the underlying mechanisms remain poorly understood. In this study, the effects of granular activated carbon (GAC) and powdered activated carbon (PAC) on Mn(II) removal by O 3 were investigated. Mn(II) was rapidly removed by O 3 alone ( k obs = 0.069 s −1 ), whereas lower rate constants of 0.048 and 0.031 s −1 were observed in the O 3 /GAC and O 3 /PAC systems, respectively, at pH 7.0. Although increasing pH enhanced Mn(II) oxidation by O 3 alone, the inhibitory effect of PAC became progressively stronger from pH 7 to 9. The inhibitory effects of GAC and PAC on Mn(II) removal were closely associated with enhanced O 3 consumption, as demonstrated by O 3 decay experiments. Although hydroxyl radicals (•OH) and superoxide radicals (O 2 •⁻ ) were generated in the O 3 /GAC and O 3 /PAC systems, radical scavenging experiments demonstrated that these species contributed negligibly to Mn(II) oxidation. Overall, GAC and PAC enhanced O 3 consumption and reduced Mn(II) removal. These findings provide new mechanistic insights into the role of AC (especially PAC) in O 3 oxidation for Mn(II) removal and contribute to a deeper understanding of combined O 3 /AC oxidation processes.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 35
·16045-16056
·
IF 7.6
Ge Xiao,Wu Xinyi,Liu Xinya,Zheng Xiyang,Xu Jinze,Tian Li-jiao,Wang Wei,Wang Xiaozhi
Spin state strongly governs the pathway selectivity of photocatalytic oxygen reduction, dictating whether the reaction proceeds via the desired two electron (2e – ) route to H 2 O 2 or the competing four electron (4e – ) pathway. Herein, this work reports a ligand-field symmetry-breaking strategy that enables controlled spin state switching, thereby steering the oxygen reduction pathway toward selective two electron H 2 O 2 production. Specifically, symmetry breaking creates an asymmetric equatorial ligand field, triggering a deterministic spin state transition from intermediate spin to high spin on the Mn site. The resulting high-spin configuration features delocalized d-states and a downshifted d-band center, which collectively weaken *OOH adsorption to suppress premature O–O bond cleavage while preserving efficient O 2 activation through spin polarized electron transfer. As a result, the optimized high spin catalyst delivers an exceptional H 2 O 2 production rate of 5025 μmol·g –1 ·h –1 under simulated sunlight, representing a 2.3-fold enhancement over its intermediate spin (IS) counterpart. Furthermore, its activity is maintained under natural sunlight in ambient air, achieving a H 2 O 2 production rate of 2662 μmol·g –1 ·h –1 . This work establishes ligand field symmetry breaking as a precise and generalizable paradigm for spin state engineering in single atom catalysis, offering a direct route to overcome the selectivity efficiency compromise in photosynthesis of H 2 O 2 .
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 29
·15483-15492
·
IF 3.9
Yuan Jiang,Xiong Jing,Ma Yaxiao,Quan Xiaolong,Wei Yuechang,Xu Linsheng,Li Yuanfeng,Liu Jian,Zhao Zhen
A series of three-dimensionally ordered macromesoporous
(3DOMM)
Ce x Mn 0.3-x Zr 0.7 O δ catalysts were synthesized by an evaporation-induced
self-assembly combined with a colloidal crystal template (EISA-CCT)
method. These catalysts exhibit excellent soot combustion activity
and possess an intact 3DOMM structure. The electronic synergy between
Mn and Ce was investigated. Mn facilitates the reduction of Ce 4+ to Ce 3+ and the generation of oxygen vacancies,
thereby increasing active oxygen species, while Ce oxidizes Mn 2+ to Mn 3+ /Mn 4+ , which enhances the intrinsic
redox ability and NO oxidation. Among the tested samples, the Ce 0.15 Mn 0.15 Zr 0.7 O δ catalyst
exhibits activity comparable to that of noble-metal catalysts and
excellent stability, which can be attributed to the maximized Ce–Mn
synergy and the intact 3DOMM morphology.
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高影响因子
Water
·
2025
·Vol. 17
·期 11
·1700
·
IF 3
Xiaoni Lin,Qiang Ge,Xianbo Zhou,Yan Wang,Congyun Zhu,Kuanyong Liu,Jinquan Wan
Bimetallic catalysts can effectively enhance the catalytic degradation efficiency of peroxymonosulfate (PMS), which is usually attributed to the enhancement of electron transfer, but currently, there is no clear explanation of the mechanism of how the electron transfer is enhanced. A nitrogen-doped Fe/Mn composite biochar (FeMn-NBC) was co-constructed by hydrothermal synthesis and high-temperature calcination. The FeMn-NBC activated PMS more efficiently than the monometallic one due to the enhanced electron transfer between Fe and Mn. The FeMn-NBC/PMS system activated PMS with Mn as the active center, and the high oxidation state of Mn4+promoted the acceleration of the PMS adsorption of the generation of Mn2+/Mn3+. This gaining effect accelerated the electron cycling between Fe2+/Fe3+and Mn2+/Mn3+/Mn4+, which enhanced the PMS catalysis to generate free radicals (•OH, SO4•−and •O2−) and non-radicals (1O2) for the efficient degradation of diisobutyl phthalate (DIBP). Benefiting from this gaining effect, the degradation rate of DIBP by the FeMn-NBC/PMS system was increased by 2.43 and 3.38 times compared to Fe-NBC and Mn-NBC. The bimetallic-enhanced electron transfer mechanism proposed in this study facilitated the development of efficient catalysts for more efficient and selective removal of organic pollutants.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 9
·6116-6136
·
IF 3.9
Liu Xiaoli,Xu Mengjin,Guo Jiaxiu,Li Jianjun
The desulfurization performance for Mn-Ni supported on activated carbons (Mn-Ni/NAC) calcined at different temperatures varies considerably. The physicochemical properties of Mn-Ni/NAC have been investigated by a series of characterization studies. The moderate calcination temperature contributed to a larger surface area and abundant oxygen-containing functional groups (C = O), thus provided more anchoring sites for the dispersion of Mn 2+ and Ni 0 species. The optimal Mn-Ni/NAC-700 exhibited superior desulfurization performance, achieving breakthrough sulfur capacity and breakthrough time of 287 mg/g and 531 min, respectively. The nucleophilic C = O groups served as active sites for chemically absorbing SO 2 . Ni 0 could serve as an oxygen activator, and promote the transfer of oxygen molecules to oxidize SO 2 . During the desulfurization, SO 2 adsorbed on the C = O groups gradually mainly converted into sulfate (SO 4 2− ). This conversion process was closely linked to the decrease of surface C = O groups and the formation of C–O groups. As the reaction proceeds, reaction products (SO 4 2+ ) begin to accumulate, blocking the pore channels of the catalyst and generating MnSO 4 , resulting in catalyst deactivation. This work will guide the design of high-performance activated carbon-based adsorbents suitable for practical applications.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 77
·49091-49096
·
IF 3.108
Lina Xue,Ka Xiong,Haijun Chen,Kyeongjae Cho,Weichao Wang
Hydrothermal aging tests are important to carry out when evaluating the hydrothermal durability of heterogeneous catalysts in vehicle exhaust emission. Here, we explored the effect of aging on an efficient Mn-based mullite catalyst (SmMn2O5) of NO oxidation. The mullite catalyst was prepared via the hydrothermal method and was subsequently aged in air with a 10% H2O stream at 750 °C for 16 hours. The fresh and aged catalysts were structurally characterized using Powder X-ray diffraction(XRD), Raman, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), high resolution-transmission electron microscope (HR-TEM), Brunauer–Emmett–Teller (BET) and temperature programmed desorption (TPD). For the performance evaluations, the samples were placed into a U-shape reactor furnace, and NO and NO2 concentrations were in situ recorded with an NOx analyzer. In contrast to fresh mullite, the aged sample showed a 25 °C higher light-off temperature and 11% conversion loss at its maximum conversion temperature of 300 °C. O2-TPD of the aged sample displayed a large decrease of the desorption area, consistent with an ∼3-fold loss of the BET specific surface area. Moreover, HRTEM, XPS and Raman spectroscopy results together indicated that a small portion of the mullite decomposed into perovskite SmMnO3 and Mn2O3, which further reduced the total quantity of Mn active sites. The reduction of the BET surface area and mullite decomposition together caused the decrease of the catalytic performance. We therefore expect maintaining the specific surface area to be important for preventing the loss of catalytic performance during the hydrothermal aging process.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 8
·118152
·
IF 6.2
Ziqin Lin,Tianxia Xie,Zhuolin Xie,Anqi Dai,Yang Yuan,Peng Sun,Yanqi Song,Zhenggang Fang,Chunhua Lu
Solar absorbers are vital for concentrated solar power (CSP) systems, yet spectral selectivity solar absorbers (SSAs) struggle with high-temperature stability in air. This study introduced Mn ions into MgTiO 3 (MTO) via a high temperature solid-phase synthesis technique to optimize the spectral selectivity. Unlike conventional doping that increased both absorptance and emittance, MgTi 0.4 Mn 0.6 O 3 (MTMO-0.6) boosted solar absorptance (α = 0.85) while maintaining low emittance (ε = 0.39, 1073.15 K) in the 2.5–15 μm wavelength range. Besides, the material retained high spectral selectivity (α/ε = 0.84/0.41) after heat treatment at 800 °C in air atmosphere for 90 h in total (9 h cycles −1 , 10 cycles), showing excellent thermal stability. Moreover, under concentrated solar irradiation of 10.83 W·cm −2 , MTMO-0.6 sample reached an equilibrium temperature of 848 ℃, surpassing that of MTO and SiC. The proposed Mn-doped MgTiO 3 has the potential as a solar absorber for high temperature solar thermal conversion.
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高影响因子
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