JOURNAL OF COORDINATION CHEMISTRY
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2020
·
IF 1.41
Huang-Fei Qin,You Li,Xing-Mei Qin,Hai-Ye Li,He-Dong Bian,Qing Yu,Fu-Ping Huang
A new complex formulated as [Mn(H2O)6][Mn2(ett)6]·0.5H2O (1) has been synthesized from 5-(ethylthio)-1H-tetrazole) (Hett) andMn(OAc)2·4H2O. The crystal structure is composed of one [Mn(H2O)6] 2+ cation and an [Mn2(ett)6] 2– anionic chain. Two Mn(II) ions are bridged by μ2-ett – ligands to give [Mn2(ett)6] 2– anionic chains, which is balanced by cationic part of [Mn(H2O)6] 2+ in charge. The hydrogen bonds between anionic/cationic units play an important role in the formation of three-dimensional (3-D) supramolecular structure of 1. Magnetic measurements of 1 exhibit an interesting spin canting behavior and long-range magnetic ordering.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Zhangxiang Lin,Pei Yuan,Yuanyuan Yue,Zhengshuai Bai,Haibo Zhu,Tinghai Wang,Xiaojun Bao
Selective separation and recovery of Co(II)/Mn(II) from purified terephthalic acid (PTA) production wastewater is very important to reduce the Co(II)/Mn(II) catalysts consumption and control the pollutant discharge. This work employed zeolites NaA, NaX, and HZSM-5 with different pore sizes and Na(I) contents to selectively separate and recover Co(II)/Mn(II) from PTA wastewater and to understand the adsorption mechanism. It is found that only NaA can exclusively adsorb Co(II)/Mn(II) through ion-exchange without adsorbing any aromatic organic compound (AOC); oppositely, HZSM-5 shows the highest adsorption capacity for AOCs but almost no adsorption for Co(II)/Mn(II); and NaX exhibits moderate adsorption capacities for both Co(II)/Mn(II) and AOCs. Moreover, pH can significantly impact the adsorption of both Co(II)/Mn(II) and AOCs due to the competitive adsorption between H(I) and Co(II)/Mn(II) and the electrostatic repulsion between AOCs and zeolites. The adsorption kinetics, isotherms, and thermodynamics were also investigated to lay a good basis for process development. Importantly, bench-scale experiments for simulating the industrial operation were carried out, and the results show that the adsorption capacity of the NaA particles for Co(II)/Mn(II) from the industrial PTA wastewater is 9.1/8.6 mg/g, respectively, without adsorbing any AOC. Therefore, an efficient strategy to selectively separate and recover Co(II)/Mn(II) from PTA wastewater was successfully developed.
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PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Fangmei Zhang,Yibing Liu,Pinyi Ma,Shuo Tao,Ying Sun,Xinghua Wang,Daqian Song
In the present study, a novel ratiometric fluorescence probe based on dual-emitting Mn-doped ZnS quantum dots (Mn:ZnS QDs) was established for detection of Pb 2+ and methyl parathion (MP). The dual-emitting Mn:ZnS QDs was aqueous synthesised in one pot and played as a ratiometric fluorescence probe for the detection of Pb 2+ with high sensitivity. The fluorescence intensity ratio (F 450nm /F 585nm ) of the probe against the concentration of Pb 2+ showed a good linear relationship from 10 nM to 60 nM with a detection limit of 0.5 nM. Furthermore, the Mn:ZnS QDs/Pb 2+ system was established as a turn-on fluorescence sensing system to quantitative measure the MP concentration. The fluorescence intensity at 450 nm exhibited a good linear relationship in the MP concentration range from 0.19 to 0.95 μM with a detection limit of about 0.02 μM. It also had a satisfying performance in fruit and environmental water samples. Therefore, the prepared Mn:ZnS QDs-based sensor has been established as a ratiometric fluorescence probe and turn-on method for quantitative detection of lead ion and MP, respectively.
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RSC Advances
·
2016
·Vol. 6
·期 59
·54615-54622
·
IF 3.289
Tao Li,Zhikun Gao,Ningwei Wang,Zhiping Zhou,Wanzhen Xu,Jianfeng Zheng,Wenming Yang
In this study, molecularly imprinted polymers with Mn-doped ZnS quantum dots (ZnS:Mn QDs) were prepared using dibutyl phthalate (DBP) as the template molecule, 3-aminopropyltriethoxysilane (APTES) as the functional monomer and the tetraethoxysilane (TEOS) as the cross-linker. ZnS:Mn QDs offer a readout signal to monitor the amount of DBP bound to the imprinted matrix and to evaluate the efficiency of imprinting. The products MIPs-ZnS:Mn QDs were characterized by transmission electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction and fluorescence spectroscopy. In addition, optical stability and the effect of pH on fluorescence intensity were evaluated. The obtained polymers can sensitively and selectively recognize template molecules in real samples via fluorescence intensity. The fluorescence intensity decreases linearly with increasing concentration in the range of 5.0–50 μmol L−1. It reaches a detection limit of 0.27 μmol L−1. The average recovery rate of DBP at three spiking levels is more than 98.1%.
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Inorganic Chemistry Frontiers
·
2016
·Vol. 4
·期 1
·144-153
·
IF 4.532
Qiao Sun,Min Liu,Keyan Li,Yitong Han,Yi Zuo,Fanfan Chai,Chunshan Song,Guoliang Zhang,Xinwen Guo
Partial isomorphic substitution of iron in an Fe(BDC)(DMF,F) metal organic framework by manganese, cobalt, and nickel has been described for the first time. Specifically, different amounts of Mn, Co and Ni have been incorporated into the Fe-based framework during a solvothermal crystallization procedure. Several characterization techniques, including XRD, FT-IR, SEM, EDS, TG, XPS and ICP-AES, strongly support the effective incorporation of Mn, Ni and Co into material frameworks. The catalytic performance of these materials was examined in liquid-phase degradation of phenol at 35 °C and near neutral pH of 6.2. The results show that the degradation efficiency can be evidently improved by the incorporation of Mn, while it can be inhibited by the incorporation of Ni. The incorporation of Co shows no remarkable influence on the degradation process. Moreover, the ratios of n(Fe)/n(Mn) in the bimetallic MOFs have a strong impact on the degradation process. The stability and reusability of these catalysts under mild conditions were also demonstrated in this study. This work illustrates the potential of bimetallic MOF structures in developing active heterogeneous catalysts for the degradation process of toxic compounds.
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PLoS One
·
2016
·Vol. 11
·期 10
·e0164657
·
IF 3.057
Zuohua Li,Yanhui Cui,Jun Chen,Lianlin Deng,Junwei Wu
Binary transition metal oxides have been regarded as one of the most promising candidates for high-performance electrodes in energy storage devices, since they can offer high electrochemical activity and high capacity. Rational designing nanosized metal oxide/carbon composite architectures has been proven to be an effective way to improve the electrochemical performance. In this work, the (Co,Mn) 3 O 4 spinel was synthesized and anchored on reduced graphene oxide (rGO) nanosheets using a facile and single hydrothermal step with H 2 O 2 as additive, no further additional calcination required. Analysis showed that this method gives a mixed spinel, i.e. (Co,Mn) 3 O 4 , having 2 + and 3 + Co and Mn ions in both the octahedral and tetrahedral sites of the spinel structure, with a nanocubic morphology roughly 20 nm in size. The nanocubes are bound onto the rGO nanosheet uniformly in a single hydrothermal process, then the as-prepared (Co,Mn) 3 O 4 /rGO composite was characterized as the anode materials for Li-ion battery (LIB). It can deliver 1130.6 mAh g -1 at current density of 100 mA g -1 with 98% of coulombic efficiency after 140 cycles. At 1000 mA g -1 , the capacity can still maintain 750 mAh g -1 , demonstrating excellent rate capabilities. Therefore, the one-step process is a facile and promising method to fabricate metal oxide/rGO composite materials for energy storage applications.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yujue Wang,Yilin Wang,Xianghao Tang,Lei Zhang,Dan Xiao,Xicui Zhang,Qian Zhao
Mn/Fe-based layered oxides are supposed to be suitable as low-cost cathode materials for sodium ion batteries (SIBs) since they are of high specific capacity and wide availability of Mn and Fe sources in nature. However, these materials generally suffer from complex and irreversible phase transitions. The manufacture of high entropy materials can solve these matters. Herein, we rationally design and synthesized high entropy doped P2-Na 0.62 Ca 0.03 Mn 0.58 Fe 0.23 Cu 0.085 Mg 0.01 Ti 0.015 Li 0.08 O 2 (NFM-HEO) material. As cathode for SIB, it exhibits enhanced long cycling stability and better rate capability compared to the undoped P2-Na 0.65 Mn 0.6 Fe 0.4 O 2 material within 2.0 ∼ 4.3 V. After 500 cycles at 1C, the capacity retention rate reaches 85.4 %, and it can provide a reversible specific capacity of 134 mAh g −1 at 0.1C and 70 mAh g −1 at 5C. In-situ XRD, diffusion kinetics results together with microstructure and phase characterization before and after cycling indicate that high entropy doping enhances structural stability of layered oxides, suppresses irreversible phase transitions, stabilizes Na + diffusion paths, ensures reversible anionic redox reactions, inhibits crack generation after cycling, prevents transition metal dissolution, and improves humid air stability. This study is expected to offer guidance for the improvement of structural stability of layered cathode for SIBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuanxi Guo,Xinxin Zhang,Hehe Wei,Hai-tao Yu,Ying Xie
High-entropy oxides (HEOs) exhibit excellent structural stability, and the synergistic effects among their constituent elements contribute to performance enhancement, providing vast opportunities for designing novel and efficient electrocatalysts. Utilizing four common transition metals such as Fe, Co, Ni, and Cr as the base and introducing a fifth metal, M (M = Mg, Mn, Zn, and Cu), with different outer electron shells, relevant high-entropy oxides with varying sizes were successfully synthesized via the hydrothermal method. Among all considered samples, FCNCMg, with the smallest particle size, possessed a much larger specific surface area, leading to the exposure of more active sites and thus favoring an improvement of the OER performance. The introduction of the fifth metal induced a redistribution of charges among Fe, Co, Ni, and Cr within the catalyst, resulting in different oxidation states for these metals. Mg addition led the XPS peaks of Fe/Ni and Cr/Co elements to shift towards lower and higher binding energies, respectively. This dynamic compensation effect between metal ions synergistically promoted their OER performance. In alkaline environments, FCNCMg exhibited the best OER performance, with an overpotential of 278 mV at 10 mA cm −2 and a Tafel slope of 49.90 mV dec −1 . Moreover, it demonstrated excellent stability, achieving 50 h at 10 mA cm −2 and 20 h at 50 mA cm −2 . This study, by controlling the composition of HEOs, explored the impact of particle size and synergistic effects on their performance, offering new insights for design and optimization of relevant high-performance HEOs.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Huihui Gan,Liang Li,Pengyuan Qiu,Mingyu Cui,Jiajun Sun,Ye Xia,Wen Zhu
Layered Li-rich Mn-based oxide cathode materials (LRMO) have attracted extensive attention because of their high energy density. However, the poor cyclic stability, rate capability, and rapidly decay in voltage impede the practical application. Herein, a novel strategy for designing LRMO modified by silica-coated silver nanowires (AgNWs@SiO 2 ) is reported. The AgNWs@SiO 2 can provide the faster Li + diffusion kinetics, increase oxygen vacancy, and facilitate the heat dissipation in LRMO. As a result, the AgNWs@SiO 2 modified LRMO delivers a higher capacity retention of 71.6 % (after 500 cycles at 25 °C) and 58.5 % (after 200 cycles at 60 °C) at 1C than that of the untreated LRMO (65.2 % after 500 cycles at 25 °C and 37.8 % after 110 cycles at 60 °C). Meanwhile, the AgNWs@SiO 2 modified LRMO also possesses high-rate discharge specific capacity of 105.4 mAh g -1 at 10C and capacity retention of 50.6 % after 1000 cycles at 3C (the untreated LRMO only remains 19.3 % after 600 cycles at 3C). Furthermore, the AgNWs@SiO 2 modified LRMO also exhibits good electrochemical performance in the cell assembled with Si@C anode. This work provides a promising strategy for the possibility practical application toward next-generation high energy density lithium-ion batteries.
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GREEN CHEMISTRY
·
2024
·Vol. 26
·期 10
·6131-6138
·
IF 9.3
Yan Wang,Xuan Wang,Yonghao Dong,Mingli Peng,Lina Guo,Mengyao Cui,Yuan He,Jiabao Yi,Huijun Ma,Huan Zhang,Haiming Fan
The selective oxidation of alcohols has drawn significant attention in heterogeneous catalysis with the increasing use of Pickering interfacial catalysis (PIC) for green transformations of alcohols. However, it is still highly desirable to design and develop a solid catalyst with easy separation and recycling, made from abundant resources through a simple synthesis route, for the selective oxidation of alcohols. In this study, ferrite nanoparticles, synthesized via a hydrothermal process, were employed to act as a stabilizer and catalyst in PIC for the oxidation of benzyl alcohol using H2O2. The ferrite nanoparticles exhibited higher catalytic performance in PIC than in acetonitrile. The turnover number (TON) of the nanocatalyst in PIC was found to be 1.5–4 times higher than that in acetonitrile, and the reaction constant in PIC (kPIC = 0.712 h−1) was almost twice that in acetonitrile (kCH3CN = 0.310 h−1) for MnFe2O4 nanoparticles. Moreover, other alcohols could also be oxidized with moderately high conversion and selectivity in PIC. Significantly, the ferrite nanocatalyst could be easily separated from PIC using a magnet for reuse, achieving 88% BzOH conversion after five cycles. The use of hazardous organic solvents was avoided in PIC, making it a more advanced, green and sustainable reaction system.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Lu Sai,Zhongsheng Dai,Zhenbo Wang,Huiling Zhao,Ying Bai
Li-rich layered oxides with high energy densities have become one kind of promising cathode for advanced lithium-ion batteries, however some issues are severely hindering their practical applications. To address these challenges, fast ion conductive LiTi 2 (PO 4 ) 3 (LTPO) is employed to modify the typical Li-rich cathode Li 1 · 2 Mn 0 · 56 Ni 0 · 17 Co 0 · 07 O 2 (LMNCO) via a sol-gel process combined with a two-step annealing treatment in this work. Serving as a physical separator, LTPO coating effectively depresses the side reactions at cathode-electrolyte interface and the transition-metal dissolution from LMNCO active material under harsh electrochemical environment. Meanwhile, LTPO layer with high ion conductivity could facilitate the interfacial Li + diffusion during charge/discharge process. In addition, partial Ti 4+ ions doped into LMNCO effectively elevate the oxygen electronegativity and restrain the excessive oxidization of lattice oxygen, thus stabilizing the crystal structure and alleviating the stress-strain propagation upon cycling. Electrochemical characterization results demonstrate that the LTPO-modified LMNCO cathode exhibits a superior capacity retention of 86.5 % after 400 cycles at room temperature and that of 73.7 % even under an elevated temperature of 45 °C after 250 cycles under 1C. This study provides a facile strategy for the surface modification of Li-rich layered-structure oxides, which also sheds light in enhancing electrochemical performances for various cathode materials .
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STRUCTURAL CHEMISTRY
·
2024
·
IF 2.1
Li Xi,Zhang Jian-Wei,Hu Xin-Cheng,Shi Xian-Lei,Wei Wei
In this work, by using a flexible tricarboxylate ligand 5-(4-carboxybenzyloxy) isophthalic acid (H 3 L), a novel pillar-layered Mn–organic framework, namely, [(CH 3 CH 2 ) 2 NH 2 ][Mn 3 (HL)L(A C ) 2 ] ( SQNU-23 , SQNU = Shangqiu Normal University), was synthesized by using a DEF/HAc solvent system. In SQNU-23 , each S-shaped Mn-O chain is interconnected by two bridging modes of organic ligand to form a 3D pillar-layered framework with 1D rectangular channels. The solid-state fluorescence of SQNU-23 exhibits a significant red shift of about 140 nm compared to that of organic ligand. Moreover, SQNU-23 as a luminescent thermometer exhibits good linear dependence in the wide temperature range (100 to 300 K).
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