SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhilan Wang,Yunxiang Zhang,Tao Yuan,Ruiying Zhang,Xiaowan Li
In this study, manganese oxide-supported catalysts (MnO x @SiO 2 ) were synthesized by co-precipitation with a subsequent high-temperature calcination and employed to activate periodate (PI) for the degradation of bisphenol A (BPA). The MnO x @SiO 2 –500 system exhibits optimum PI activation performance with an associated 96.0 % BPA degradation efficiency outperforming MnO x . The MnO x @SiO 2 –500/PI system was subjected to comprehensive analysis, including electrochemical tests, quenching experiments, electron spin resonance (ESR), methyl phenyl sulfoxide (PMSO) probe experiments, Mn ion leaching detection, UV–vis spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results revealed that BPA degradation is promoted by a MnO 2 -PI ⁎ complex via homogeneous activation in solution and iodate radicals (IO 3 • ) involving heterogeneous activation. In the case of the homogeneous activation, Mn(II) undergoes a two-electron transfer to form MnO 2 , which is complexed with PI to generate MnO 2 -PI ⁎ . In the heterogeneous activation, Mn 3 O 4 on the surface of MnO x @SiO 2 –500 activates PI to produce IO 3 • . Based on high-performance liquid chromatography-mass spectrometry (HPLC-MS) and density functional theory (DFT) calculations, three possible BPA degradation pathways are proposed. In pathways I and II, the active species attack C atoms on the two BPA benzene rings to initiate hydroxylation and oxidation. In pathway III, the attack generates a C C bond, yielding multiple degradation intermediates bearing a benzene ring. In addition, the acute and chronic toxicities of by-products with respect to aquatic organisms are predicted using the ECOSAR software. The majority of degradation intermediates exhibit lower toxicity than the starting BPA. This study provides a green and efficient strategy for BPA removal in wastewater treatment.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yang Bao,YunJia Ling,ZeYing Ji,Hongru Zhou,Shaoxian Song,Feifei Jia,Jianbo Li,Mildred Quintana
In this study, the incorporation of Mg2+ induced the transformation of MnO2 from the original cubic [MnO6] octahedron to a flattened conformation (FLA-MnO2). The flattened conformation mitigated structural deformation of the [Mn3+·O6] octahedron by inhibiting the J–T aberration during the reduction process of Mn4+, thereby improving the selective adsorption capacity of lithium. When used in hybrid capacitive deionization (HCDI), FLA-MnO2 exhibited a high Li+ adsorption capacity of 30.14 mg g−1 in 32.74 mg L−1 Li+ ion solution, with low energy consumption of 0.45 Wh g−1. Notably, the FLA-MnO2‖AC HCDI cell exhibited high stability, maintaining 82% of its capacity over 100 cycles. This was evidenced by the 82% capacity retention and low Mn loss (1.3%) over 100 cycles. Finally, the excellent selective extraction performance of Li+ ions was demonstrated in Lop Nor, the low-grade original brine of the XieLi salt flats. The calculated separation factors for Li+/Na+, Li+/K+, Li+/Ca2+, and Li+/Mg2+ reached impressive values of 4.37, 3.75, 3.24, and 2.11, respectively, making the Lop Nor a candidate electrode for lithium extraction from low-grade raw brines.
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高影响因子
CURRENT MICROBIOLOGY
·
2025
·Vol. 82
·期 9
·1-14
·
IF 2.6
Xiao Mengzhu,Wu Yujia,Li Wanzhen,Wang Jun,Zhang Weiwei,Gui Lin,Ge Fei
Antibiotics, a milestone invention in modern medicine, have significantly improved human quality of life and serve as a primary weapon against bacterial infections. However, antibiotic abuse has led to the emergence and worsening of bacterial resistance, now a major global public health challenge. Therefore, the efficient use of nanoscale antimicrobial peptides (APs) as therapeutic and diagnostic agents offers a novel strategy to replace conventional antibiotics. In this study, we innovatively combined AP with manganese dioxide (MnO 2 ) and zeolitic imidazolate framework-8 (ZIF-8) to develop a novel composite: ZIF-8-encapsulated and AP-loaded MnO 2 (AP-MnO 2 @ZIF-8). This composite exhibited superior properties, including enhanced biocompatibility, excellent aqueous stability, and increased antibacterial activity. Both in vitro and in vivo AP-MnO 2 @ZIF-8 demonstrated potent efficacy against multidrug-resistant (MDR) Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Its minimum inhibitory concentrations (MICs) were 20 μg/ml for E. coli and 39 μg/ml for S. aureus . Furthermore, colony-forming unit (CFU) assays showed that 150-μg/ml AP-MnO 2 @ZIF-8 reduced bacterial survival below 5%, indicating effective growth inhibition. Crucially, it significantly suppressed bacterial activity in S. aureus -infected mouse wound models. Compared to free AP or MnO 2 alone, AP-MnO 2 @ZIF-8 showed significantly enhanced water solubility, bioavailability, and antibacterial activity. This work provides a foundation for developing AP-based antimicrobial strategies and offers a novel nanomaterial approach to combat the increasingly severe antibiotic resistance crisis. Graphical
研究领域:
纳米技术
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材料科学
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微生物学
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药学
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生物医学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Jiahuan Wang,Zuozhu Yin,Xiangyu Han,Yongcun Ma,Zhen Hong,Chan Xie,Zhiyang Jiang,Yidan Luo
Avionics equipment often use epoxy resin as encapsulation material. However, epoxy resins have limited performance in terms of heat dissipation, electromagnetic shielding, and resistance to moisture and heat. As the integration of avionics continues to increase, epoxy resins have become more and more difficult to meet the stringent requirements for high reliability of avionics in the aerospace industry. In this study, inspired by the unique structure of lotus leaves, a thin film composite of mesophase carbon microspheres (MCMB) and manganese dioxide (MnO 2 ) was prepared on the surface of a copper foil using a mechanical hybrid spraying method. The film exhibits excellent superhydrophobicity with a water contact angle of 161.1°. This performance was attributed to its micro- and nanoscale roughness structure and low surface energy modification by POTS/stearic acid. In terms of infrared stealth, the composite material effectively suppresses thermal radiation through a trapped air layer and gradient thermal resistance design. In addition, the material’s electromagnetic shielding effectiveness in the 2.4 GHz band reaches −56 dB, originating from the synergistic effect of reflection loss in the copper substrate and dielectric absorption in MnO 2 . At the same time, the three-dimensional network constructed by the MCMBs gives the material high thermal conductivity, which significantly improves the thermal management efficiency. The composite film also has good abrasion resistance, chemical stability and self-cleaning function, which is suitable for avionics and other fields of protection, providing a new solution to solve the problem of avionics packaging.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9
Hanbo Shi,Nannan Zhang,Wei Guo,Tancheng Dong,Bihui Zhou,Lanlan Yu,Baojun Liu,Jincheng Mu
Birnessite-type δ-MnO 2 is a promising candidate for low-temperature NH 3 -SCR reaction owning to its excellent redox properties. However, its performance is severely hampered by the excessive oxidation state of Mn species, which induces strong NH 3 chemisorption and subsequent over-oxidation to NO x . Herein, phenylalanine-functionalized δ-MnO 2 nanosheets (MnO x -Phe) were developed, leveraging Phe's coordinating –NH 2 group to modulate surface properties of Mn species. The optimal MnO x -Phe-0.1 catalyst achieves ∼90% NO x conversion at 75 °C with a broad temperature window from 75 to 210 °C (GHSV = 50,000 h −1 ), representing a reaction rate 4.8 to 8.2 times greater than that of pure δ-MnO 2 . Additionally, the catalyst exhibits remarkable resistance against SO 2 and H 2 O. Comprehensive characterizations and density functional theory calculations reveal that Phe modification shifts down the d -band center of δ-MnO 2 from −1.22 eV to −2.78 eV, and attenuates the oxidation state of Mn species. This unique configuration suppresses the over-oxidation of NH 3 and weakens the interaction between catalyst and poisons, while promoting the activation of NH 3 to *NH 2 with a lower energy barrier, thus driving a desired Eley-Rideal pathway and endowing strong tolerance against SO 2 and H 2 O at low temperatures. This work provides a novel organic-inorganic hybrid strategy for designing robust low-temperature NH 3 -SCR catalysts with superior activity and poison resistance.
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高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 2
·e03495
·
IF 2
You Li,Jinjian Lv,Yuning Sun,Lulu Zhan,Weiming Chen
MnO 2 is the most promising cathode material for aqueous zinc ion batteries (AZIBs), but poor conductivity, structural instability, and slow Zn 2+ kinetics in MnO 2 -based AZIBs still limit their practical use. Here, we present the introduction of graphene (Gr) into δ-MnO 2 with a layered structure designed for AZIBs to understand the effect of carbon materials on the electrochemical behavior of δ-MnO 2 cathodes. Nanoflower-structured δ-MnO 2 composites with graphene were fabricated via a one-step hydrothermal synthesis method. Owing to the incorporation of Gr, the cycling stability, rate performance, and reversibility of δ-MnO 2 have been significantly enhanced. The results show that at a current density of 0.5 A g − 1 , the δ-MnO 2 -1.5 h/Gr electrode exhibits a specific capacity of 125 mAh g − 1 with a capacity retention of 53.4% and a high Coulombic efficiency of 99.2%. At a higher current density of 1 A g − 1 , this electrode delivers a specific capacity of 142.5 mAh g − 1 after 1000 cycles, substantially higher than that of the δ-MnO 2 -1.5 h electrode. In addition, electrochemical data show that δ-MnO 2 -1.5 h/Gr possesses a higher pseudo-capacitance percentage and best rate performance. This study confirms that incorporating carbon materials is an effective strategy for enhancing the energy storage performance of δ-MnO 2 in AZIBs and understanding its charge-discharge mechanism. Graphical The incorporation of graphene (Gr) improved the cycling stability, rate capability, and reversibility of δ-MnO2. δ-MnO2/Gr possessed higher ion diffusion rates and higher pseudo-capacitance occupancy, and exhibited the best rate performance. Thus, improving the zinc storage performance and cycling stability of zinc ion water batteries.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junjun Tang,Shuan Ma,Yu Jiang,Lufeng Yang,Jie Chen,Xuemin Yan,Bohong Chen,Zhenxiong Huang
The inferior cycling stability of MnO 2 -based cathodes, resulting from Mn dissolution and crystal structure transition during Zn-ion insertion/extraction, poses a significant challenge hindering their widespread adoption in aqueous zinc-ion batteries (AZIBs). To mitigate these issues, we propose an approach involving the incorporation of small organic molecules (methylformamide, dimethylformamide, and formamide) to modify the crystalline structure of MnO 2 . These molecules, characterized by their low orbital energy levels, facilitate the creation of energetically equivalent electron transfer pathways with the unoccupied e g orbitals in Mn 4+ , as evidenced by the DFT calculations. Furthermore, they modulate the electron cloud density of Mn-O and introduce structural disorder in the MnO 2 crystalline lattice, thereby greatly enhancing the structural stability of the Mn-based cathode. In AZIBs tests, the MnO 2 /methylformamide (MO/NMF) cathode demonstrates a remarkable reversible specific capacity exceeding 270 mAh g -1 at 1 A g -1 and exceptional durability, exhibiting negligible capacity degradation after 2000 cycles at 3 A g -1 . In-situ X-ray diffraction, neutron powder diffraction and high-angle annular dark-field scanning transmission electron microscopy analyses confirm the structure stability of MO/NMF during Zn-ion insertion/extraction, attributed to the NMF modification. Additionally, the electrochemical data indicate that modifications with dimethyl formamide and formamide also positively impact the electrochemical performance of the MnO 2 cathode. This study offers valuable insights for the development of high-performance Mn-based cathodes.
研究领域:
材料科学
·
电化学
·
能源存储
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高影响因子
Small
·
2018
·Vol. 14
·期 51
·1803978
·
IF 9.598
Donghong Wang,Hongfei Li,Zhuoxin Liu,Zijie Tang,Guojin Liang,Funian Mo,Qi Yang,Longtao Ma,Chunyi Zhi
There is a growing demand for flexible and wearable energy devices. How to enhance their tolerance to various mechanical stresses is a key issue. Bending, stretching, or twisting of flexible batteries has been widely researched. However, shear force is inevitably applied on the batteries during stretching, bending, and twisting. Unfortunately, thus far, research on analyzing shear resistance of solid batteries or even enhancing the shear tolerance has never been reported. Herein, a sewable Zn–MnO 2 battery based on a nanofibrillated cellulose (NFC)/ployacrylamide (PAM) hydrogel, electrodeposited Zn nanoplates anode, and carbon nanotube (CNT)/α-MnO 2 cathode is reported. The designed NFC/PAM hydrogel exhibits a relatively high mechanical strength with a large stretchability; the preformed NFC bone network stabilizes the large pores as channels for electrolyte diffusion. Furthermore, the effect of sewing on enhancing the shear resistance of the solid batteries is analyzed. The sewed Zn–MnO 2 battery retains 88.5% of its capacity after 120 stitches, and withstands a large shear force of 43 N. The sewable and safe Zn–MnO 2 is also able to be designed into a skirt and put on a toy as an energy source to power a red light emitting diode.
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高影响因子
BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Chao Liu,Juying Hou,Geoffrey I.N. Waterhouse,Lin Cui,Jing Dong,Shiyun Ai
A novel pH-responsive sandwich-type electrochemiluminescence immunosensor was successfully developed for the detection of avian leukosis virus subgroup J (ALV-J). The immunosensor consisted of graphene oxide functionalized with tannic acid (rGO-TA) and primary antibodies (Ab 1 ) as the main ALV-J sensing platform. For signal amplification , pH-responsive hollow MnO 2 (hMnO 2 ) nanospheres encapsulating Ru(bpy) 3 Cl 2 and carrying secondary antibodies (Ab 2 ) were employed. Under optimal conditions, the immunosensor exhibited a wide ALV-J detection range of 10 1.80 to 10 4.30 TCID 50 /mL (TCID 50 : 50% tissue culture infective dose) and a low detection limit of 10 1.71 TCID 50 /mL (S/N = 3). Importantly, the immunosensor showed high sensitivity, good reproducibility and excellent operational stability. Finally, the immunosensor was evaluated using a real avian serum sample containing ALV-J, with excellent results being achieved.
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高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Keqing Zhang,Hangda Chen,Baoquan Xiao,Jie Chen,Wei Yan,Yanpeng Liu,Changfa Hu,Long Chen,Juanjuan Huang,Shanglong Peng
Layered manganese oxide has rich active sites, amounts of variable valence states, and economic feasibility, so it has attracted wide attention. In aqueous zinc ion batteries, its poor conductivity and easy solubility in water limit its performance as an electrode. Therefore, we used a simple one-step hydrothermal method to prepare Ag+ intercalated MnO2 for aqueous zinc-ion batteries’ cathode. An in-depth exploration of the electrochemical phenomenon of Ag–MnO2 found that interlayer Ag+ regulates the electronic structure of MnO2 and reduces the Jahn–Teller effect, and the desolvation of Ag–MnO2 is easier, which promotes the embedding of Zn2+. In addition, the migration of Ag+ and the in situ formation of Ag metal particles also enhance the conductivity of the electrode. As a result of the Ag+-Ag0 synergistic effect, Ag–MnO2 has obtained high rate performance (275.6 mA·h·g–1 at 200 mA·g–1) and excellent cycle stability (98.8% capacity retention over 600 cycles at 1000 mA·g–1). This provides insights for the pre-inserted Ag+ to improve the electrochemical performance of MnO2.
研究领域:
材料科学
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电化学
·
储能
·
电池技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Qianqiu Tang,Mingming Chen,Chongyang Yang,Wenqiang Wang,Hua Bao,Gengchao Wang
With the advantages of high stickiness and stretchability of the hydrogel electrolyte as well as the resilient properties of film electrodes, the facile “prestrain-stick-release” strategy can be utilized for the assembly of a stretchable supercapacitor. Two major issues of concern are the relatively low mechanical strength of the hydrogel electrolyte and the low energy density of the assembled device. Herein, vinyl group grafted silica (CH2═CH—SiO2) nanoparticles were used as a nanoparticle cross-linker for polyacrylamide (PAAM), enhancing the tensile strength of 844 kPa at the strain of 3400% for the KCl—CH2═CH—SiO2/PAAM hydrogel electrolyte. Besides, carbon nanotube supported polypyrrole (CNT@PPy) and manganese dioxide (CNT@MnO2) film electrodes are prepared to assemble the stretchable asymmetric CNT@MnO2//KCl—CH2═CH—SiO2/PAAM//CNT@PPy supercapacitor, significantly enhancing the potential window to 0–2.0 V and achieving a high energy density of 40 Wh kg–1 at the power density of 519 kW kg–1 with the strain of 100%, which is the best known for the reported stretchable supercapacitors.
研究领域:
储能技术
·
材料科学
·
纳米技术
·
柔性电子学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Cong Lyu,Dan He,Zishen Mou,Xuejiao Yang
In this paper, manganese dioxide (MnO 2 ) loaded iron oxyhydroxide (β-FeOOH) was synthesized aiming to improve the catalytic performance of β-FeOOH as peroxymonosulfate activator. The β-FeOOH@MnO 2 /PMS system exhibited excellent performance and its reaction rate constant of Acid Orange 7 (AO7) degradation (0.0533 min −1 ) was approximately 2.3 times as that in β-FeOOH/PMS system (0.0232 min −1 ). β-FeOOH@MnO 2 possessed superior properties as catalyst than β-FeOOH, owing to the higher surface hydroxyl density with higher specific surface area , redox ability and electronic transmission rate. Moreover, on the basis of the analysis from FTIR and XPS , it was found that the redox reaction of Fe 3+ /Fe 2+ and Mn 4+ /Mn 3+ synergistically activated PMS as well as the generation of FeOH + and MnOH 2+ accelerated activating PMS in the β-FeOOH@MnO 2 /PMS system. Thus, MnO 2 and FeOOH synergistically activated PMS to reactive oxygen species (ROS). And 1 O 2 , O 2 − and OH were identified as predominant ROS in the β-FeOOH@MnO 2 /PMS system on the basis of the result from quenching experiments and ESR . As a result, TOC removal rate was increased up to 22.62%. Additionally, β-FeOOH@MnO 2 exhibited good stability with low iron dissolution and manganese dissolution. Generally, this study proposed that β-FeOOH@MnO 2 was an efficient and environmental catalyst as PMS activator for organic pollutant degradation in water.
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高影响因子
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