Journal of Water Process Engineering
·
2025
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IF 6.7
Yaoyu Yan,Shuchen Sun,Jing Wei,A. Shubo,Faxin Xiao,Ganfeng Tu
Electrolytic manganese residue (EMR), a hazardous solid waste from electrolytic manganese metal (EMM) production, poses serious environmental risks due to its complex mineralogy and heavy metal mobility. However, it also holds potential as a secondary resource. We establish an end-to-end waste-to-materials flowsheet—sulfuric-acid curing → water leaching → impurity removal → one-step conversion—that selectively recovers Mn from EMR and upgrades it to phase-pure, high-value Mn₃O₄ nanomaterials. The effects of curing temperature and acid dosage on the leaching behaviors of Mn, Fe, Al, and Si were systematically investigated. At 240 °C and an acid dosage of 2.5 times the stoichiometric requirement, Mn leaching efficiency reached 95.35 %, while Si leaching remained below 50 % due to silicate encapsulation and gelation. Kinetic modeling using the shrinking core model revealed that Mn dissolution was primarily controlled by product-layer diffusion, with an apparent activation energy of 14–18 kJ·mol −1 . FTIR, XRD, SEM–EDS, and BET analyses showed that acid curing disrupted the dense silicate matrix and increased surface area from 9.4 to 55.6 m 2 ·g −1 . Mn 2+ in the purified leachate was directly precipitated and oxidized using an NH₃·H₂O–H₂O₂–EDTA system, producing uniformly sized Mn₃O₄ nanoparticles. Rather than a stand-alone synthesis, the impurity-tolerant process with defined operating windows is the core contribution, with the Mn₃O₄ product validating this waste-to-value pathway. This integrated route offers a scalable framework for hazardous-waste valorization while clarifying sulfuric-acid-curing transformation and leaching kinetics, advancing sustainable metal recovery.
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高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2025
·
IF 1.3
Lifen Meng,Yinying Zhang,Mengting Su
The determination of vitamin B6 (VB6) in food, health products, and pharmaceuticals is of great significance because it plays a crucial role in maintaining health and is a necessary condition for dietary intake. Therefore, the study uses L-Histidine, citric acid, potassium permanganate, and tetraethyl silicate as carbon source and Mn, Si source to prepare Mn, Si-CQDs by a hydrothermal method. The characteristics of the Mn,Si-CQDs are studied by TEM, XPS, FTIR, XRD, and UV-vis spectrum, Mn,Si-CQDs are spherical and well dispersed in aqueous solution, with an average particle size of 5 nm. The effect of different pH and storage time on the fluorescence intensity of Mn, Si-CQDs indicates that Mn, Si-CQDs have good fluorescence stability. The fluorescence of Mn, Si-CQDs can be selectively quenched by VB6 without being affected by interfering other substances, within the range of 0.05-20 μg/mL, The quenching degree ratio of Mn, Si-CQDs , F 0 /F, shows a good linear relationship with the concentration of VB6 (F 0 /F=0.19311+0.03723C (R 2 =0.99882)), with a detection limit of 0.037 μg/mL. The recovery rates were 94.21∼98.80% by the spiked recovery experiments, indicating the high sensitivity and selectivity of the Mn,Si-CQDs . During the antibacterial test, the Mn,Si-CQDs exhibite good antibacterial effects on Staphylococcus aureus, Penicillium, Escherichia coli and Saccharomyces cerevisiae .
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 54
·e202201687
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IF 5.02
Jiaqi Ke,Yufei Zhang,Yibo Zhang,Minghui Ye,Zicheng Zhang,Yongchao Tang,Xiaoqing Liu,Cheng Chao Li
Rechargeable zinc-ion batteries (ZIBs) are potential for grid-scale applications owing to their safety, low price, and available sources. The development of ZIBs cathode with high specific capacity, wide operating voltage window and stable cyclability is urgently needed in next-generation commercial batteries. Herein, we report a structurally crystalline-stable Mn(VO 3 ) 2 nanobelts cathode for ZIBs prepared via a facile hydrothermal method. The as-synthesized Mn(VO 3 ) 2 exhibited high specific capacity of 350 mAh g −1 at 0.1 A g −1 , and maintained a capacity retention of 92 % after 10,000 cycles at 2 A g −1 . It also showed good rate performance and obtained a reversible capacity of up to 200 mAh g −1 after 600 cycles at 0.2 A g −1 under −20 °C. The electrochemical tests suggest that Mn(VO 3 ) 2 nanobelts impart fast Zn 2+ ions migration, and the introduction of manganese atoms help make the structures more indestructible, leading to a good rate performance and prolonged cycle lifespan. Graphical The crystalline-stable Mn(VO 3 ) 2 nanobelts cathode presents the specific capacity of 350 mAh g −1 at 0.1 A g −1 and maintain a capacity retention rate of 92 % for 10,000 cycles at a current density of 2 A g −1 . It also rendered good rate performance and obtained a reversible capacity of up to 200 mAh g −1 after 600 cycles at 0.2 A g −1 even under −20 °C. Benefiting from the unique tunnel type nanobelts structure, the Mn(VO 3 ) 2 nanobelts show high Zn 2+ migration kinetics and stable framework for reversible ions de-/insertion.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Chao Li,Pengfei Zhao,Bo Ma,Dongxuan Xie,Xiaofei Liu,Songhan Hu,Yingchun Diao,Kai Wang,Yonghui Ma,Qiang Wang
Red-emissive Cu nanoclusters were synthesized via a green room-temperature strategy using glutathione and ascorbic acid. • Zn 0.4 Mn 0.6 Fe 2 O 4 nanoparticles were selected as the magnetic component owing to their superior magnetic properties over conventional Fe 3 O 4 . • Cu nanocluster-decorated Zn 0.4 Mn 0.6 Fe 2 O 4 nanocomposites were successfully fabricated through a simple assembly process. • The optimized nanocomposite integrated bright red fluorescence with excellent T 2 -weighted magnetic resonance performance. • A green and low-cost strategy was developed for constructing multifunctional fluorescence/MR nanocomposites. Given the intrinsic limitations of single-modality imaging, integrating optical and magnetic functionalities into a single nanoplatform offers a promising strategy for multimodal imaging. Herein, Cu nanocluster-decorated Zn 0.4 Mn 0.6 Fe 2 O 4 nanocomposites (CuNCs-ZMF) were rationally fabricated for dual-modal fluorescence and magnetic resonance imaging. Glutathione-protected CuNCs were synthesized using ascorbic acid as a mild reductant, while superparamagnetic Zn 0.4 Mn 0.6 Fe 2 O 4 nanoparticles were synthesized via thermal decomposition and subsequently surface-functionalized with cetyltrimethylammonium bromide to improve aqueous dispersibility and facilitate assembly with CuNCs. The resulting CuNCs-ZMF exhibited red fluorescence centered at 660 nm with an absolute quantum yield of 5.89% and a transverse relaxivity ( r 2 ) of 160.52 mM −1 s −1 . T 2 -weighted MR imaging demonstrated Fe concentration-dependent negative contrast enhancement, while in vivo imaging revealed pronounced darkening of the liver region following intravenous administration. CCK-8 assays further demonstrated relatively favorable cytocompatibility at low-to-moderate concentrations. These results demonstrate the successful integration of fluorescence and magnetic resonance imaging capabilities and support the potential of CuNCs-ZMF for fluorescence/MRI dual-modal imaging applications.
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Advanced Healthcare Materials
·
2026
·
IF 11
Jiajia Jia,Zhitong Guan,Jiaxin Wang,Ting Fang,Jiajun Sun,Aiyang Tong,Yingzhen Fan,Ming Zhao,Dongkai Wang,Zheran Wang,Ji Li
Although cGAS-STING immunotherapy holds immense potential, its efficacy is severely compromised by pathway evasion. To overcome this, we engineered a core-shell bilayer nanobomb (M/ZIF/MnO 2 @DBCO) via a template-assisted approach, integrating MSC1094308 into ZIF-8 cores followed by MnO 2 shell deposition and DBCO functionalization. In a simulated tumor microenvironment, ZIF-8 loading accelerated Mn 2+ release from MnO 2 , increasing the cumulative release by nearly 30% within 8 h compared to pristine MnO 2 . Cellular assays demonstrated rapid bio-orthogonal targeting of azide-modified tumors, achieving lysosomal escape within 6 h postuptake. Subsequently, MnO 2 -mediated glutathione (GSH) depletion and hydroxyl radical (·OH) generation, combined with Zn 2+ induced mitochondrial oxidative stress, produced cytotoxic reactive oxygen species (ROS) that triggered immunogenic cell death. Furthermore, Mn 2+ , Zn 2+ , and dsDNA released from damaged mitochondria cooperatively activated the cGAS-STING pathway. Concurrently, MSC1094308 inhibited ESCRT-mediated negative regulation, as evidenced by a ∼0.2 decrease in the p-STING/VPS4B-RFP colocalization coefficient, confirming the blockade of cGAS-STING evasion. In vivo studies revealed that the nanoplatform profoundly stimulated antitumor immunity, increasing tumor-infiltrating cytotoxic T lymphocytes approximately 8-fold versus untreated controls after 21 days. This work establishes an integrated strategy harnessing Zn 2+ /Mn 2+ synergy, nanobomb reactivity, and ESCRT inhibition to circumvent cGAS-STING evasion, offering a promising paradigm for cancer immunotherapy.
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PubMed
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Junrong Lai,Yanfang Li,Chenxu Yin,Kaiyang Mao,Anchi Mao,Haiqin Wan,Lin Dong
Generally, binary metal oxides often exhibit superior catalytic performance to their single-metal counterparts, with crystal-phase structure being a critical factor alongside the metallic composition. However, systematic studies elucidating the role of crystal phase remain scarce. Herein, we synthesize a series of Mn–Ce oxide catalysts (MnCeOx) with distinct crystal phases─bixbyite (Mn2O3-type) and fluorite (CeO2-type)─by a sol-gel method and evaluate their performance in the catalytic oxidation of benzene, toluene, and their mixture. MnCeOx outperformed individual Mn2O3 and CeO2 in both single- and mixed-pollutant scenarios. Noticeably, the fluorite-phase catalysts displayed markedly higher activity than their bixbyite-phase analogues. In single-pollutant oxidation, benzene is oxidized at a lower temperature (T90) than that of toluene. Conversely, in co-oxidation mixtures, toluene exhibits a lower T90 than benzene, indicating a reversal of reactivity under competitive conditions. Comprehensive characterization and theoretical calculations reveal that the high activity of the fluorite phase originates from its lower-valent Mn centers and oxygen vacancies. In mixed benzene/toluene streams, toluene significantly inhibited benzene oxidation because of competitive adsorption. This work highlights the decisive role of crystal-phase engineering in designing efficient multicomponent oxide catalysts for VOC removal.
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PubMed
高影响因子
ACS Omega
·
2026
·
IF 5.2
Qing Lin,Haoran Jiang,Yong Hu,Ziwen Dong,Song Kong,Yangli Cui
Addressing the practical predicament of uneven global distribution of phosphate resources, this study focuses on transition-metal-based short-chain perfluorocarboxylates (Mn-TFA and Ni-TFA) and systematically investigates their flame-retardant properties, aiming to develop efficient novel phosphorus-free flame retardants. The results of micromorphological characterization indicate that Mn-TFA forms a porous network structure, and Ni-TFA exhibits a polyhedral morphology, both of which possess distinct crystallinity attributed to the coordination interaction between metal ions and carboxylate groups. Flame-retardant performance evaluation demonstrates that samples display excellent flame-retardant effects: their flame-retardant performance is significantly superior to that of ammonium dihydrogen phosphate (the core active component of commercial flame retardants) at all tested concentrations. Particularly under medium-concentration loading conditions, the flame-retardant paper can achieve a self-extinguishing effect. The results of TG-IR-MS combined analysis show that the generation rates of CO and CO2 in the fuel system are significantly accelerated under the action of the flame retardants, indicating that the flame-retardant process is dominated by the condensed-phase effect.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
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IF 7.8
Renjie Liu,Yongjun Zhang,Zhenli Zhang,Hongjing Han,Haiying Wang,Yuting Guan,Yanan Zhang,Bolong Jiang,Xuzhong Gong,Enhao Sun,Yanguang Chen
Coke deposition is a key obstructive problem to be solved in the production of ethylene via steam cracking; moreover, the removal of graphitic carbon in coke is particularly difficult. A strategy integrating Fe–Mn bimetallic synergy at the B-site with oxygen vacancy engineering in perovskites was proposed to accelerate the catalytic conversion of coke/graphitic carbon via steam. DFT simulations and experimental results revealed that Mn incorporation induces dynamic lattice reconstruction of SrFeO3, generating abundant oxygen vacancies that enhance oxygen ion mobility and H2O adsorption. The interaction between Fe and Mn atoms has been observed to narrow the band gap, strengthen the hybridization of the O-2p and Fe-3d orbitals, induce electron delocalization, regulate the transfer of electrons from surrounding atoms to the adsorbed oxygen species, and thus accelerate the desorption and activation of *OH and the transfer of *O2–, which provides the possible reaction pathway for the transformation of graphitic carbon into CO or CO2. At 900 °C, the conversion of graphitic carbon and coke with steam catalyzed by SrFe0.1Mn0.9O3 reached 60.61% and 99.87%, respectively. This study provides an active material that facilitates the in situ online decoking strategy for catalytic coatings on steam cracking furnace tubes along with theoretical insights into the underlying reaction mechanism.
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Inorganics
·
2026
·Vol. 14
·期 3
·88
·
IF 3.4
Naifeng Chen,Yi Li,Chenxia Gao,Chao Xue,Shuang Liu,Jinghang Li,Xi Cao,Kuilin Lv,Yuguang Lv
This study systematically investigated the characterization of 2Fe-CDs/12Mn-CeO2composites and the colorimetric sensing properties of H2O2, glucose (Glu), and glutathione (GSH). The morphology, structure, and optical properties of the 2Fe-CDs/12Mn-CeO2composite were analyzed in detail by XRD, FT-IR, SEM, TEM, XPS, and Raman spectroscopy, and its formation was supported by multiple complementary characterization techniques. The catalytic efficiency (kcat/Km) of the nanozyme is 152-fold higher than natural HRP under optimal conditions and remains 59-fold higher even after temperature normalization to 25 °C. In the colorimetric sensing experiments, the detection limits of Fe-CDs/Mn-CeO2were 0.21 μM, 2.7 μM, and 0.63 μM for H2O2, Glu, and GSH, respectively. Rapid and accurate determination of the concentrations of these biomolecules can be achieved by observing the color changes after Fe-CDs/Mn-CeO2reaction with the objects to be measured. The experimental results show that Fe-CDs/Mn-CeO2have high sensitivity and selectivity for H2O2, Glu, and GSH, which provides a solid theoretical and experimental basis for the application of Fe-CDs/Mn-CeO2in the field of biosensing and medical diagnosis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Khizar Qureshi,Rizwan Haider,Chenrui Zhang,Muhammad Imran Abdullah,Ayaz Muzammil,Zhanyu Ding,Liang Wu,Xianxia Yuan
Spent NMC532 cathode is upcycled into an electrocatalyst for water splitting. • CEC leaching enables over 94% recovery of Li, Ni, Mn, and Co from NMC532. • RNMC-S@NF reaches 4 A cm −2 with overpotential of 539 mV for OER and 414 mV for HER. • OER catalysed by RNMC-S@NF follows a LOM mechanism. • Conventional and MOR-assisted OWS reach 4 A cm −2 at 1.98 and 1.60 V, respectively. The disposal of spent lithium-ion batteries (LIBs) is emerging as a serious environmental issue due to the rapid expansion of electric vehicle market. Current recycling routes typically involve recovery of metals as separate metal salts but rarely convert them directly into functional materials, leaving a largely unmet opportunity for value-added utilization of recovered battery metals. In this work, a sustainable strategy is presented for converting spent LIB cathodes into a high-performance, bifunctional electrocatalyst. Briefly, contact electrocatalysis induced metal leachate solution from LiNi 0.5 Mn 0.3 Co 0.2 O 2 was directly used as a metal source along with thiourea to obtain a hierarchical 3D micro-flower sulfide supported on nickel foam (RNMC-S@NF) via hydrothermal process. The optimized RNMC-S@NF catalyst exhibits exciting electrocatalytic activity, requiring overpotentials of 240/539 mV for oxygen evolution reaction (OER) and 107/414 mV for hydrogen evolution reaction (HER) to reach 0.1/4 A cm −2 , respectively. In addition, a symmetrical 2-electrode (RNMC-S@NF||RNMC-S@NF) device requires a low cell voltage of 1.98 V to deliver industrial-scale current density of 4 A cm −2 , significantly outperforming commercial benchmarks of RuO 2 @NF||Pt/C@NF. RNMC-S@NF also shows high activity toward methanol oxidation reaction (MOR), and an MOR-assisted water splitting electrolyzer achieves 4 A cm −2 at a cell voltage of 1.60 V, demonstrating energy-saving hydrogen generation together with high-value formate production. This work not only establishes a scalable route from spent LIBs to industrial-scale green hydrogen, but also offers mechanistic insight into lattice-oxygen-driven OER catalysis and practical guidance for circular-economy battery-recycling policy. Download: Download high-res image (170KB) Download: Download full-size image Metals recovered from NMC532 cathode in spent lithium-ion battery via CEC-assisted leaching are converted into RNMC-S@NF electrocatalyst, driving industrial-scale current densities for efficient hydrogen generation in both conventional and MOR-assisted water splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yifeng Xia,Hua Hao,Zhonghua Yao,Chongyan Hao,Minghe Cao,Hanxing Liu
The polarization–breakdown trade-off is broken in SBLTMO thin films. • P r is suppressed while P max and breakdown strength are enhanced. • Leakage mechanisms and defect activation energy are tailored via defect-chemistry regulation. • A high W rec of 131.1 J/cm 3 with 74% efficiency is achieved. Achieving high energy storage performance in dielectric thin films requires both a high breakdown strength and large polarization difference between maximum and remanent polarization. Although Aurivillius-phase ferroelectrics offer excellent fatigue resistance and high breakdown tolerance, their pronounced ferroelectric hysteresis narrows this polarization difference, especially under high electric fields where intensified leakage conduction further broadens the polarization hysteresis. Herein, to overcome this limitation, Mn-doped SrBi 4.76 La 0.24 Ti 4.5 Mg 0.5 O 18 Aurivillius thin films are designed to realize synergistic breakdown enhancement and polarization regulation. Mn incorporation induces local tensile lattice strain, leading to increased maximum polarization. Meanwhile, leakage current is effectively reduced after Mn doping, and remanent polarization decreases because of the weakened contributions from leakage current and irreversible domain switching, thereby achieving effective polarization regulation. Analysis of leakage-conduction mechanisms reveals that Mn incorporation extends the electric-field range dominated by Ohmic and trap-filled-limited conduction before the onset of rapidly increasing leakage under high electric field, thereby enhancing breakdown strength. Consequently, the optimized Mn-doped SBLTMO thin film achieves a recoverable energy density of 131.1 J/cm 3 and an efficiency of 74.0% under 4.5 MV/cm, together with excellent frequency, thermal, and cycling stability. These findings demonstrate the effectiveness of rational defect design in coupling breakdown enhancement with polarization regulation for high-performance Aurivillius dielectric thin films.
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Small
·
2026
·
IF 11.8
Jingya Wang,Li Li,Baoju Zhou,Xin Yao,Wenle Ma,Ronghai Yu,Hui Zhang
Medium-entropy alloys (MEAs) are promising electromagnetic wave absorption (EMA) materials for their designable crystal structures, tunable electromagnetic properties, and stable phase structures and so on. However, their inherent high density and excessive dielectric constant cause severe impedance mismatch, which greatly limits practical applications. Herein, we propose a lattice distortion engineering strategy via Mn doping, combined with a template-free self-propagating combustion method, to construct lightweight Ni 5 Co 3 Fe 2 MEA aerogels with synergistically optimized impedance matching and electromagnetic energy dissipation. TEM and GPA confirm that Mn doping induces significant lattice distortion in the optimal (Ni 5 Co 3 Fe 2 ) 0.8 Mn 0.2 aerogel. The Mn-induced lattice distortion precisely dual-regulates electromagnetic properties, tailoring electrical conductivity to optimize impedance matching and introducing abundant defective dipoles to boost polarization loss. Its three-dimensional interconnected porous structure delivers an ultralow density of 0.0376 g cm −3 , supporting preliminary lightweight impedance matching optimization. This synergistic design endows the aerogel with an exceptional RL min of −82.9 dB at 1.43 mm and 4.42 GHz EAB, outperforming state-of-the-art MEA absorbers and providing a new lattice distortion engineering paradigm for lightweight high-efficiency EMA materials.
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