COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Chao Feng,Shanshan Qiao,Yuan Guo,Yuehong Xie,Li Zhang,Naeem Akram,Shiang Li,Jide Wang
The development of a highly efficient renewable heterogeneous catalysts for the synthesis of cyclic carbonates by the cyclic esterification of epoxides and carbon dioxide under relatively mild reaction conditions is of great significance in the territory of chemical fixation of carbon dioxide (CO 2 ). This work comprises on a functional catalytic material F-Mn-MOF-74 using an effective competitive coordination strategy, adenine (Ad) as alkali source and competitive ligand, introduced onto the synthetic Mn-MOF-74. An F-Mn-MOF-74 crystal having a spherical structure and being functionalized is obtained, and lone pair of electrons on the nitrogen atom in the adenine can compete with 2,5-hydroxyterephthalic acid for coordination. The alkalinity exhibited by adenine is beneficial to enhance the catalytic properties of the crystal in the cycloaddition reaction of epoxide with carbon dioxide. Further catalytic experiments showed that the functionalized F-Mn-MOF-74 crystal combined with tetrabutylammonium bromide in the lacking of solvent showed excellent catalytic activity in the cycloaddition reaction of styrene oxide and carbon dioxide. Under the optimal reaction conditions after screening (100 °C and 10 bar CO 2 pressure), the yield of cyclic carbonate was as high as 99 %. The excellent catalytic performance for other epoxides also confirmed that F-Mn-MOF-74 catalytic material is universal in its application. The catalytic performance of the catalyst was not significantly decreased after being recycled seven times, attributed to its excellent stability. The possible mechanism for the synergistic effect of Lewis acid-base properties of functionalized F-Mn-MOF-74 catalytic material with cocatalyst is also proposed.
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高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Li Tang,Chunyu Wang,Sizhu Tian,Zhimin Zhang,Yong Yu,Daqian Song,Ziwei Zhang
Mn(II)-based electron spin resonance (ESR) spectroscopy was used for detecting butyrylcholinesterase (BChE) and organophosphorus pesticides (OPs). MnO2 nanosheets were synthesized with manganese chloride and hydrogen peroxide. With the catalysis of BChE, S-butyrylthiocholine iodide (BTCh) was hydrolyzed into thiocholine which has a reducing −SH group. In the presence of thiocholine, MnO2 nanosheets were broken down and Mn(IV) in MnO2 nanosheets was reduced into Mn(II). Mn2+ is a paramagnetic ion and gives a good ESR signal. In contrast, MnO2 nanosheets have no ESR signal and need not be separated from Mn2+. Mn2+ can be determined directly by ESR spectroscopy, and no further sensing probe is needed. ESR spectroscopy based on directly detecting Mn2+ is much simpler than those using other probes besides MnO2. The ESR signal of Mn2+ is proportional to the catalytic activity of BChE. OPs which inhibit the activity of BChE can also be detected by probing the ESR signal of Mn2+. Since there is no ESR signal of MnO2 nanosheets, the background signal in the absence of BChE was close to zero. The limit of detection (LOD) of BChE was as low as 0.042 U L–1. The standard curve for determining the OP paraoxon was established by measuring the inhibition of BChE by paraoxon, and the LOD of paraoxon was found to be 0.076 ng mL–1. The spiked Chinese cabbage extract samples were analyzed, and the experimental results indicated that the recoveries were from 96.5 to 102.8%. The planted Chinese cabbage was sprayed with the paraoxon solution, and the residue amount of paraoxon in the extract was estimated by the method. The result obtained by the present method was consistent with that obtained by HPLC, which proved the practicability of this new method.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Xueyan Li,Lei Wang,Xin Zheng,Xiang Tu,Anhong Cai,Jing Deng
In this study, a UV-driven photocatalytic activation of peroxymonosulfate (PMS) system was constructed using bimetallic metal-organic frameworks to degrade pharmaceuticals and personal care products (PPCPs). Mn-MIL-53(Fe) was successfully synthesised by adjusting the doping ratio of Mn using solvothermal method. The removal of ibuprofen (IBP) by UV/Mn-MIL-53(Fe)/PMS process was as high as 79.7% in 30 min with a Mn doping ratio of 1.0 (molar ratio of Mn to Fe), and the reaction rate constant was 26.9% higher than undoped. Mn-MIL-53(Fe) had been systematically characterized in terms of its physical structure, microscopic morphology, surface functional groups and photoelectric properties. The mechanism investigation revealed that the cycling of Mn and Fe accelerated the rate of electron transfer in the system, which significantly increased the activation efficacy of PMS to generate more hydroxyl and sulfate radicals for IBP degradation. A total of 13 transformation products were detected during the degradation of IBP by the UV/Mn-MIL-53(Fe)/PMS process. Theoretical calculations were used to predict the sites on the IBP molecule that were vulnerable to attack, and four possible degradation pathways were deduced. The excellent stability and efficient catalytic properties of Mn-MIL-53(Fe) provided a promising solution to the problem of water treatment contaminated with PPCPs.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 3
·1524-1530
·
IF 3.361
Fan Bai,Lincheng Xu,Daode Wang,Li An,Zhanzhong Hao,Fan Li
Manganese oxide composites with mixed valence states were prepared through the hydrothermal method by compositing with Ti4O7 and calcining at different temperatures, and their ORR and OER catalytic performance were investigated. The prepared catalysts were characterized by XRD, SEM-EDS, HRTEM-EDS, and XPS methods to analyse their phase constitution, morphology feature, and surface composition. The major phase of manganese oxides was Mn3O4, which is a one-dimensional structure, and its growth was induced by Ti4O7. The ORR and OER catalytic activity can be enhanced due to the preferred orientation of manganese oxides. Electrochemical measurements, namely CV, LSV and EIS, were utilized for determining the ORR and OER catalytic activity, whereas CA and ADT were used for studying the durability and stability. A Li–O2 battery was assembled to test the electrochemical behavior and properties in practical application. MnOx/Ti4O7 calcined at 300 °C exhibited the best catalytic activity of 0.72 V vs. RHE half-wave potential for ORR and 0.67 V vs. RHE overpotential for OER. The proportion of Mn3+ was also highest in all the MnOx/Ti4O7 composites. The assembled Li–O2 battery shows high performance with a voltage gap of only 0.85 V. Therefore, it can be affirmed that the inducement of Ti4O7 could strengthen the preferred orientation in manganese oxide growth and Mn3+ in MnOx/Ti4O7 plays a vital role in catalyzing ORR and OER, with both improving the ORR and OER bifunctional catalytic performance of manganese oxides.
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高影响因子
Advanced Science
·
2020
·Vol. 7
·期 21
·2002199
·
IF 15.84
Qiuyu Shen,Xudong Zhao,Yongchang Liu,Youpeng Li,Jian Zhang,Ning Zhang,Chenghao Yang,Jun Chen
Iron/manganese-based layered transition metal oxides have risen to prominence as prospective cathodes for sodium-ion batteries (SIBs) owing to their abundant resources and high theoretical specific capacities, yet they still suffer from rapid capacity fading. Herein, a dual-strategy is developed to boost the Na-storage performance of the Fe/Mn-based layered oxide cathode by copper (Cu) doping and nanoengineering. The P2-Na 0.76 Cu 0.22 Fe 0.30 Mn 0.48 O 2 cathode material synthesized by electrospinning exhibits the pearl necklace-like hierarchical nanostructures assembled by nanograins with sizes of 50–150 nm. The synergistic effects of Cu doping and nanotechnology enable high Na + coefficients and low ionic migration energy barrier, as well as highly reversible structure evolution and Cu/Fe/Mn valence variation upon repeated sodium insertion/extraction; thus, the P2-Na 0.76 Cu 0.22 Fe 0.30 Mn 0.48 O 2 nano-necklaces yield fabulous rate capability (125.4 mA h g −1 at 0.1 C with 56.5 mA h g −1 at 20 C) and excellent cyclic stability (≈79% capacity retention after 300 cycles). Additionally, a promising energy density of 177.4 Wh kg −1 is demonstrated in a prototype soft-package Na-ion full battery constructed by the tailored nano-necklaces cathode and hard carbon anode. This work symbolizes a step forward in the development of Fe/Mn-based layered oxides as high-performance cathodes for SIBs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 8
·1-11
·
IF 2.8
Yang Zhengyu,Jin Wan
The great attention of rechargeable Zn-air battery has motivated extensive research on the development of inexpensive, highly efficient, and robust noble-metal-free bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this work, Mn-N-C-950 single-atom catalyst with biomass aerogel as precursor was successfully synthesized. The resulting Mn-N-C-950 exhibited excellent bifunctional catalytic performance for ORR ( E 1/2 = 0.843 V) and OER ( E j=10 = 1.56 V) in alkaline electrolytes, which can compete with previously reported bifunctional electrocatalysts. In addition, compared to the Pt/C + RuO 2 mixed catalyst, this bifunctional catalyst can endow the self-made zinc-air battery with better power density (114.1 mW/cm 2 ) and cycle stability (105.5 h), demonstrating its potential feasibility in practical applications of rechargeable metal air batteries.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 7
·11298-11303
·
IF 5.1
Senkui Qu,Huan Liu,Yu Jiang,Zhihua Qian,Bing Liu,Minmin Mao,Zhilun Lu,Hadi Barzegar Bafrooei,Yingjie Ren,Ehsan Taheri-Nassa,Feng Shi,Ge Wang,Kaixin Song
Y 3-x Mn x Al 5-x Si x O 12 (x = 0.1–0.5) ceramics were fabricated through the high-temperature reaction method. The effects of Mn 2+ -Si 4+ co-doping on lattice occupancy, ligand distortion and microwave dielectric properties of Y 3 Al 5 O 12 garnet were inquired. Mn 2+ ions successively occupy the lattice sites of Y 3+ dodecahedron and Al 3+ octahedron along with the increase of distortion degree of [AlO 6 ] octahedron. In Y 3-x Mn x Al 5-x Si x O 12 , ε r predominantly correlates with ionic polarizability , average bond ionicity (△ f i ) and Mn 2+ ionic lattice occupation. The Q × f is primarily influenced by factors like relative density, lattice energy (U) and atomic packing fraction. Meanwhile, τ f is associated with the distortion of octahedra, bond energy (E), and the bond valence between Y/Mn and O. Ultimately, the microwave and millimeter-wave dielectric properties of the Y 2.8 Mn 0.2 Al 4.8 Si 0.2 O 12 ceramics excel with values of ε r = 10.89, Q × f = 56,135 GHz@11 GHz (Q × f = 88200 GHz@25 GHz), and τ f = -39.35 ppm/°C.
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DESALINATION
·
2025
·
IF 9.8
Xifan Li,Xin Li,Mingmei Zheng,Jialin Shi,Lu Yang,Yushun Yang,Guijing Chen,Shengchi Bai,Xiao Lin,Wen Liu,Baicang Liu
The transition in the global energy structure has significantly increased the demand for new energy resources, particularly lithium. To efficiently recover lithium from shale gas wastewater, this study developed an innovative blended adsorbent granule combining crown ether (CE) polymer backbones integrated with Mn-based lithium-ion sieve to maximize lithium adsorption sites. The CE-based adsorbent featured a porous, honeycomb-like interior structure and a high specific surface area of 15.20 m 2 /g, with Mn-based adsorbent uniformly dispersed within the CE polymer matrix. Lithium adsorption performance was systematically evaluated through adsorption isotherms, kinetics, selectivity and reusability tests. The CE-based adsorbent exhibited a lithium adsorption capacity of 17.04 mg/g, recovering over 82.7 % of lithium, with a partition coefficient reaching 1686.75 mL/g, outperforming the PVC-based counterpart. Moreover, the adsorbent showed excellent selectivity for lithium, with a Li/Na separation factor of 421.80. In fixed-bed adsorption-desorption experiments, the CE-based adsorbent processed shale gas wastewater volume up to 100 times its own bed volume, concentrating lithium ions by a factor of 5. To better understand the extraction mechanisms and selectivity, density functional theory calculations were conducted, including optimized structures, molecular orbitals, charge transfer and stabilization energy. Compared to Na + , the CE polymer preferential adsorbed Li + ion, which occupied the crown ether ring core, exhibited shorter O Li bond lengths, greater charge transfer and stabilization energy. This study provides a novel strategy for advancing lithium adsorption materials and presents promising potential for efficient lithium recovery from complex wastewater sources.
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高影响因子
DESALINATION
·
2026
·
IF 9.9
Hongru Zhou,Zeying Ji,Yuxuan Xie,Shaoxian Song,QingMiao Wang,Jianbo Li,Feifei Jia
Surface spinel reconstruction on Li-rich Mn oxide mitigates Jahn-Teller distortion and Mn dissolution, 87% after 80 cycles. • S-LMCN enables rapid Li extraction with 42.25 mg g−1 capacity in 40 min, which demonstrates exceptional kinetics. • The heterostructure reduces the activation energy barrier for Li + charge transfer by 23.98% and it significantly decreases the charge-transfer resistance and facilitating interfacial Li + transport. • The S-LMCN in HCDI enabled highly selective lithium extraction, with an energy consumption as low as 2.07 kWh per Manganese-based electrodes for electrochemical lithium extraction from salt-lake brines are plagued by structural instability induced by the Jahn–Teller effect and poor electronic conductivity. These challenges result in significant capacity degradation and high energy costs for extracting Li + selectively. To tackle these issues, this work investigates a lithium-rich manganese-based layered-spinel heterostructure combined with a low-energy hybrid capacitive deionization system. The heterostructure establishes effective pathways for Li + transport to improve selectivity even in low-quality brines, while also reducing manganese dissolution caused by the Jahn–Teller effect and ensuring long-term cycling stability. Specifically, with these dedicated Li + transport channels in place, the energy barrier for electrochemical lithium extraction, as reflected by the activation energy (Ea) for Li + charge transfer, is reduced by 27.34% (from 29.70 to 21.58 kJ mol −1 ). This reduction facilitates a rapid, high-capacity uptake of 42.25 mg g −1 within 40 min. Furthermore, in comparison to the layered parent material, manganese dissolution is suppressed from 35.72% to 11.74%, resulting in an absolute reduction of 23.98 percentage points, even after undergoing 80 cycles. Download: Download high-res image (405KB) Download: Download full-size image
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高影响因子
ACS Nano
·
2026
·
IF 17.3
Yuanyuan Liu,Wanyue Sheng,Rui Cao,Hanxiao Chang,Jintao Liu,Mingqi Li,Sridhar Komarneni,Qiwen Ran
High-voltage (>4.3 V) P2-type Mn-based layered oxides have emerged as promising cathode materials for sodium-ion batteries (SIBs), yet its practical application is impeded by irreversible oxygen redox reaction (ORR), Jahn–Teller distortion, and microcrack formation. Herein, an innovative high configurational entropy engineered hollow microsphere of Na0.67Li0.18Co0.08Mn0.71Mg0.13Cu0.08O2 (HEHM-NMO) as cathode material is proposed to realize stress self-dissipation and sustainable cationic/anionic redox, thereby endowing wide-temperature (−10–60 °C) workability for SIBs. It is found that the high configurational entropy enhances the electronic structure disorder (ESD) for impeding undesired oxygen escape and also optimizes the orbital hybridization (O 2p–Mn 3d) to induce reversible ORR (O2–/O2n–). By coupling high configurational entropy with hollow microspheres, spontaneous stress dissipation in HEHM-NMO is achieved during the cycling process. As a result, the HEHM-NMO cathode can provide an ultrahigh initial charge capacity of 171.7 mA h g–1 with an initial Coulombic efficiency of 92.9% at 1.5–4.5 V and still enable a retention of 85.8% after 300 cycles at 2C. Notably, it also shows a wide-temperature (−10–60 °C) workability, delivering a capacity of 152.0 mA h g–1 at −10 °C and 192.7 mA h g–1 at 60 °C (average decay: 0.12% per cycle). This work provides atomic-level insights into entropy-dominant structural and electronic regulation for activating reversible oxygen redox.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Cuirong Yan,Xiunan Cai,Zhongqiu Luo,Qingxia Ouyang,Xintao Zhou
Heterogeneous Fenton-like catalytic oxidation is a promising technology for eliminating refractory organic pollutants, yet precise regulation of its intrinsic pathways (radical or non-radical) remains challenging. In this study, copper smelting slag was employed as a sustainable precursor to synthesize a nitrogen/manganese co-doped iron-based transition metal silicate (N/Mn-Fe-TMSs) catalyst for peroxymonosulfate (PMS) activation. The study demonstrates that Mn doping at Fe sites induces local lattice distortion and charge enrichment in the two-dimensional nanosheet architecture, and increases the d-band electron density of Fe sites, thereby enhancing PMS adsorption. The adsorbed PMS undergoes peroxy bond polarization and cleavage at these electron-enriched sites, with subsequent electron transfer to the metal centers, efficiently promoting singlet oxygen ( 1 O 2 ) generation. Additionally, nitrogen introduction transforms Me–O into unsaturated Me–N coordination, optimizing the d-band center of Fe sites. This modification significantly lowers the activation energy for PMS deprotonation and facilitates the formation of high-valent metal-oxo species. Consequently, the degradation pathway shifts from being predominantly radical-driven (74.5%) to a non-radical-dominated process (64.2%). Owing to these synergistic effects, the N/Mn-Fe-TMSs/PMS system achieves 99.3% removal of butyl xanthate within 15 min, exhibiting a degradation rate 56.4 times faster than that of the undoped system. Furthermore, the system exhibited remarkable resistance to interference from co-existing ions, exceptional structural stability, and excellent reusability. This study presents a sustainable and cost-effective approach for valorizing copper slag while advancing the design of non-radical-driven PMS activation systems for efficient and durable wastewater treatment.
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DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 22
·3994
·
IF 5.719
Zhanwu Wang,Yingrui Sui,Meiling Ma,Tianyue Wang
Cu2ZnSn(S,Se)4(CZTSSe) films are considered to be promising materials in the advancement of thin-film solar cells. In such films, the amounts of S and Se control the bandgap. Therefore, it is crucial to control the concentration of S/Se to improve efficiency. In this study, Cu2MnxZn1−xSnS4(CMZTS) films were fabricated using the sol-gel method and treated in a Se environment. The films were post-annealed in a Se atmosphere at various temperature ranges from 300 °C to 550 °C at intervals of 200 °C for 15 min to obtain Cu2MnxZn1−xSn(S,Se)4(CMZTSSe). The elemental properties, surface morphology, and electro-optical properties of the CMZTSSe films were investigated in detail. The bandgap of the CMZTSSe films was adjustable in the scope of 1.11–1.22 eV. The structural propeties and phase purity of the CMZTSSe films were analyzed by X-ray diffraction and Raman analysis. High-quality CMZTSSe films with large grains could be acquired by suitably changing the selenization temperature. Under the optimized selenization conditions, the efficiency of the fabricated CMZTSSe device reached 3.08%.Keywords:Cu2ZnSn(S,Se)4film;Mn-doping;solar cells;properties;selenization temperature
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PubMed
高影响因子
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