Polymers
·
2022
·Vol. 14
·期 24
·5417
·
IF 4.967
Shaoju Jian,Yuhuang Chen,Fengshuo Shi,Yifei Liu,Wenlong Jiang,Jiapeng Hu,Xiaoshuai Han,Shaohua Jiang,Weisen Yang
The occurrence of fluoride contamination in drinking water has gained substantial concern owing to its serious threat to human health. Traditional adsorbents have shortcomings such as low adsorption capacity and poor selectivity, so it is urgent to develop new adsorbents with high adsorption capacity, renewable and no secondary pollution. In this work, magnetic electrospun La-Mn-Fe tri-metal oxide nanofibers (LMF NFs) for fluoride recovery were developed via electrospinning and heat treatment, and its defluoridation property was evaluated in batch trials. Modern analytical tools (SEM, BET, XRD, FTIR) were adopted to characterize the properties of the optimized adsorbent, i.e., LMF11 NFs with a La:Mn molar ratio of 1:1. The surface area calculated via BET method and pHpzcassessed using pH drift method of LMF11 NFs were 55.81 m2g−1and 6.47, respectively. The results indicated that the adsorption amount was highly dependent on the pH of the solution, and reached the highest value at pH = 3. The kinetic behavior of defluoridation on LMF11 NFs was dominated by the PSO model with the highest fitted determination coefficients of 0.9999. Compared with the other three isotherm models, the Langmuir model described defluoridation characteristics well with larger correlation coefficients of 0.9997, 0.9990, 0.9987 and 0.9976 at 15 °C, 25 °C, 35 °C and 45 °C, respectively. The optimized LMF11 NFs exhibited superior monolayer defluoridation capacities for 173.30–199.60 mg F−/g at pH 3 at 15–45 °C according to the Langmuir isotherm model. A thermodynamic study proved that the defluoridation by LMF11 NFs is a spontaneous, endothermic along with entropy increase process. In addition, the LMF11 NFs still showed high defluoridation performance after three reused cycles. These findings unveil that the synthesized LMF11 NFs adsorbent is a good adsorbent for fluoride remediation from wastewater owing to its low cost, high defluoridation performance and easy operation.Keywords:La-Mn-Fe tri-metal oxides nanofibers;defluoridation;electrospinning;kinetics;wastewater treatment
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Journal of Materiomics
·
2021
·
IF 6.425
Yang Yin,Jing-Ru Yu,Yu-Cheng Tang,Ai-Zhen Song,Huan Liu,Dong Yang,Jing-Feng Li,Lei Zhao,Bo-Ping Zhang
NaNbO 3 -based ceramics usually show ferroelectric-like P-E loops at room temperature due to the irreversible transformation of the antiferroelectric orthorhombic phase to ferroelectric orthorhombic phase, which is not conducive to energy storage applications. Our previous work found that incorporating CaHfO 3 into NaNbO 3 can stabilize its antiferroelectric phase by reducing the tolerance factor ( t ), as indicated by the appearance of characteristic double P-E loops. Furthermore, a small amount of MnO 2 addition effectively regulate the phase structure and tolerance factor of 0.94NaNbO 3 -0.06CaHfO 3 (0.94NN-0.06CH), which can further improve the stability of antiferroelectricity. The XRD and XPS results reveal that the Mn ions preferentially replace A-sites and then B-sites as increasing MnO 2 . The antiferroelectric orthorhombic phase first increases and then decreases, while the t shows the reversed trend, thus an enhanced antiferroelectricity and the energy storage density W rec of 1.69 J/cm 3 at 240 kV/cm are obtained for 0.94NN-0.06CH-0.5%MnO 2 (in mass fraction). With the increase of Mn content to 1.0 % from 0.5 %, the efficiency increases to 81 % from 45 %, although the energy storage density decreases to 1.31 J/cm 3 due to both increased tolerance factor and non-polar phase.
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Small
·
2022
·Vol. 18
·期 13
·2106863
·
IF 15.153
Jie Huang,Yeqing Chen,Pengpeng Rao,Zongming Ni,Xueying Chen,Jie Zhu,Chen Li,Gaoyang Xiong,Ping Liang,Xin He,Songnan Qu,Jun Lin
Carbonized polymer dots (CPDs) have received tremendous attention during the last decade due to their excellent fluorescent properties and catalytic performance. Doping CPDs with transition metal atoms accelerates the local electron flow in CPDs and improves the fluorescent properties and catalytic performance of the CPDs. However, the binding sites and the formation mechanisms of the transition-metal-atom-doped CPDs remain inconclusive. In this work, Mn 2+ -ion–doped CPDs (Mn-CPDs) are synthesized by the hydrothermal method. The Mn 2+ ions form Mn O bonds that bridge the sp 2 domains of carbon cores and increases the effective sp 2 domains in the Mn-CPDs, which redshifts the fluorescence emission peak of the Mn-CPDs slightly. The Mn 2+ ions form covalent bonds in the CPDs and remedy the oxygen vacancies of the CPDs, which cuts off the non-radiative–recombination process of the Mn-CPDs and increases the quantum yield of the Mn-CPDs to 70%. Furthermore, the Mn O bonds accelerate the electron flow between adjacent sp 2 domains and enhances the electron transport in the Mn-CPDs. Thus, the Mn-CPDs demonstrate excellent catalytic performance to activate hydrogen peroxide (H 2 O 2 ) and produce hydroxyl radicals (•OH) to degrade methylene blue (MB) and rhodamine B (RhB).
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Fuel Cells
·
2017
·Vol. 17
·期 5
·723-729
·
IF 1.706
Y. Yi,J. Huo,W. Wang
Molecular simulation method was firstly used for analyzing the energy of aluminum alloy systems alloyed by Mg, Ga, Zn and Mn. Based on the analyses, Al-Mg, Al-Ga, Al-Zn, Al-Mn alloys were metallurgically prepared. The structures, electrochemical activities and utilization ratios were characterized by X-ray diffraction patterns (XRD), anodic polarization measurement and galvanostatic discharge. The calculated energies of the aluminum alloy systems increase in the following order: Al< Al-Mn < Al-Mg < Al-Zn < Al-Ga. The absolute values of the open circuit potentials of the alloys measured in alkaline solution rank in the following orders: φ Al-Ga alloy > φ Al-Zn alloy > φ Al-Mg alloy > φ Al-Mn alloy and the order is consistent with the calculated energies. The results indicate that molecular simulation based on the first-principles is a useful method in the alloying design and thermodynamic performance prediction. Alloy additives Zn and Ga effectively change the open circuit potential of metal aluminum to a more negative potential. In addition, alloy additive Zn increases the charge transfer resistance of Al→Al 3+ , which decreases the discharge current density. Alloy additive Mg diminishes the grain size of the alloy and notably enhances the discharge current density. Alloy additive Mn improves the utilization ratio remarkably when discharging in alkaline solution.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fan Feng,Suli Chen,Shiqiang Zhao,Wenli Zhang,Yigao Miao,Haiying Che,Xiao-Zhen Liao,Zi-Feng Ma
Sodium manganese hexacyanoferrate (PBM) is one of the most promising cathode materials for sodium-ion batteries due to its high theoretical capacity, high voltage, and low cost. However, its cycling performance is limited by serious Mn ions dissolution during Na + insertion/extraction. In this work, a facile in situ ion-exchange strategy is developed to synthesize sodium manganese hexacyanoferrate coated by sodium nickel hexacyanoferrate (PBM@PBN). The as-prepared PBM@PBN showed superior cyclic stability and enhanced rate capability. PBM@PBN exhibited a high reversible capacity of 126.9 mAh g −1 (1 C), with a capacity retention of 74.3% after 800 cycles. ICP results proved that superior cyclic stability was attributed to the inhibition of Mn ions dissolution by PBN coating. Besides, PBM@PBN also exhibited enhanced rate capability, and it delivered a high capacity of 87.2 mAh g −1 at 10 C. Ex -situ XRD proved that the PBM@PBN undergoes a reversible structural change (monoclinic ↔ cubic/tetragonal) during the whole cycle. PBN coating inhibited the PBM from suffering serious Mn ions dissolution during Na + insertion/extraction, thus ensured the framework stability of PBM during long-term cycling and contributed to the excellent electrochemical performance. The simple preparation of PBM@PBN makes it accessible for large-scale applications.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 12
·1-11
·
IF 6.232
Chu Xu,Ning Gan,Zhou Zhiqiang,Liu Yi,Xiao Qi,Huang Shan
A one-pot hydrothermal synthesis of manganese-doped carbon dots (Mn-CDs) is reported for fluorescent “on-off-on” determination of Mn(VII) and L-ascorbic acid (L-AA) in aqueous solution and living cells. Mn-CDs were prepared by using sulfanilic acid, tetrakis(hydroxymethyl)phosphonium chloride, and Mn(II) chloride as precursors. Mn-CDs were characterized by several spectroscopic methods and microscopic techniques. Mn-CDs show distinctly long fluorescence lifetime (12.39 ± 0.07 ns) and high absolute fluorescence quantum yield (around 37%) with excitation and emission wavelengths of 362 and 500 nm, respectively. Mn-CDs exhibit no significant cytotoxicity to human cervical carcinoma HeLa cells and human embryonic kidney HEK-293T cells at 200 μg mL −1 level after 48 h incubation. The fluorescence of Mn-CDs at 500 nm (excited at 362 nm) is quenched efficiently by Mn(VII) and can be further recovered after the addition of L-AA, resulting in a fluorescent “on-off-on” assay for the determination of Mn(VII) and L-AA. Under optimal experimental conditions, the linear response covers the 3 to 150 μM Mn(VII) concentration range and the 3 to 140 μM L-AA concentration range. This method offers relatively low detection limits of 0.66 μM for Mn(VII) and 0.90 μM for L-AA. This strategy was applied to visual determination of Mn(VII) and L-AA in living HeLa cells with satisfying results.
Schematic presentation of bright Mn-CD-based fluorescence “on-off-on” assay for both Mn(VII) and L-AA. This fluorescent assay possessed low detection limit of 0.66 μM for Mn(VII) and 0.90 μM for L-AA. This strategy was applied for visual determination of Mn(VII) and L-AA in living HeLa cells with satisfying results.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Jingren Yang,Deqian Zeng,Qinggang Zhang,Ruofan Cui,Muhammad Hassan,Lingqian Dong,Jun Li,Yiliang He
Fenton-like technology is a green pathway for removing recalcitrant organic pollutants from the environment. However, low catalytic efficiency and poor stability hinder the development of Fenton-like technology as a result of the lack of effective catalysts. Here, we report a highly efficient and stable Fenton-like catalyst based on isolated single Mn atom anchored on N-doped porous carbon. The catalyst exhibits high activity and stability in the heterogeneous activation of peroxymonosulfate (PMS) for organic pollutant degradation, showing an outstanding turnover frequency of greater than 5.69 min −1 in bisphenol A (BPA) degradation. A variety of analytical techniques as well as density functional theory (DFT) calculations suggest that the unique N-coordinated single Mn atom (MnN 4 ) serves as a highly catalytically active site for PMS activation, while the adjacent pyrrolic N site acts as an adsorption site for the target organic molecules. The ultra-high catalytic activity of single Mn atom catalyst can be attributed to its fantastic dual reaction sites, which remarkably shorten the migration distance from the radical to the adsorbed organic molecules.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lingqian Ye,Hao Fu,Jianeng Ji,Zhiqiang Wu,He Ren,Yu Zhang,Minjie Shi,Jun Yang
The Mn-based Prussian blue analogs (PBAs) have garnered significant attention due to their high specific capacity, stemming from the unique multi-electron reactions with Na + . However, the structural instability caused by multi-ion insertion impacts the cycle life, thus limiting their further application in aqueous sodium-ion batteries (ASIBs). To address this issue, this work employed an in situ epitaxial solvent deposition method to homogeneously grow Ni hexacyanoferrate (NiHCF) on the surface of MnPBA, which can effectively overcome the de-intercalation instability. The resulting heterostructured MnPBA@NiHCF integrates the multiple redox-active centers of MnPBA with the confinement ability of the outer NiHCF layer, thereby maintaining overall structural stability. As a cathode material for ASIBs, MnPBA@NiHCF achieves a reversible specific capacity of 66.2 mAh/g after 200 cycles at 1 A/g, significantly outperforming the single-component MnPBA and NiHCF, respectively. Moreover, it demonstrates ultralong cycling stability with only 0.0002 % capacity fade per cycle over 20,000 cycles at 10 A/g. Extensive kinetic analyses further confirm its superior Na + diffusion behaviors with disclosed redox mechanism through the comprehensive in situ Raman and ex situ analysis. A full cell built with a polyimide (PI) anode achieved an energy density of up to 59.9 Wh kg −1 , displaying a power output of 1200.4 W kg −1 and exceptional cycle stability. This work provides innovative insights for developing stable PBA cathodes for ASIB applications.
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产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Run Yuan,Yihe Qin,Can He,Zichen Wang,Lu Bai,Hong Zhao,Zijian Jiang,Lingyao Meng,Xuwen He
It is important to develop a catalyst that has high catalytic activity and can improve the degradation efficiency of refractory organic pollutants in the catalytic ozonation process. In this study, Fe-Mn-Cu-Ce/Al 2 O 3 was synthesised via impregnation calcination for catalytic ozonation of bio-treated coking wastewater. The physical and chemical characteristics of the catalysts were analysed using X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller nitrogen adsorption–desorption methods. The effects of catalyst dosage, pH, and reflux ratio on the degradation efficiency of wastewater were examined in laboratory-scale experiments. The chemical oxygen demand (COD) removal rate of bio-treated coking wastewater was estimated to be 52.76 % under optimal conditions. The experiments on the catalytic mechanism demonstrated that the surface hydroxyl formed by the Lewis acid sites on the surface of the catalyst can react with ozone as the active site forming the active oxygen (·OH, ·O 2 – , and 1 O 2 ), thereby efficiently degrading the organic pollutants in coking wastewater. Furthermore, a pilot-scale experiment on the catalytic ozonation of bio-treated coking wastewater was carried out using an Fe-Mn-Cu-Ce/Al 2 O 3 catalyst, while the effects of the initial pollutant concentration, ozone concentration, and gas flow on the COD removal rate were studied on a pilot scale. It was found that the COD removal rate of the wastewater was ∼ 60 % under optimal parameters. After the treatment, the wastewater steadily reached the coking wastewater discharge standard (COD < 80 mg/L), while the operating cost of catalytic ozonation reached ∼ 0.032$/m 3 , thereby paving the way toward economic engineering applications. The COD degradation kinetics in the bio-treated coking wastewater followed pseudo-second-order kinetics. Three-dimensional fluorescence and gas chromatography–mass spectrometry revealed that macromolecular organic pollutants in the bio-treated coking wastewater were greatly degraded. In summary, Fe-Mn-Cu-Ce/Al 2 O 3 exhibited good reusability, high catalytic activity, and low cost and has a wide application prospect in the treatment of coking wastewater.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 26
·19799-19806
·
IF 3.84
Xiao Wei,Zhiping Zhou,Tongfan Hao,Hongji Li,Yongsheng Yan
In this paper, novel molecularly imprinted polymers (MIPs) based on Mn doped ZnS quantum dots (QDs) with molecular recognition ability were successfully synthesized by precipitation polymerization using 2,6-dichlorophenol (2,6-DCP) as template, methacrylic acid (MAA) as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the cross-linker. The obtained materials (MIPs-ZnS:Mn QDs), which were composed of Mn doped ZnS QDs as phosphorescence signal and MIPs as molecular selective recognition sites, could sensitively and selectively recognize the template molecules by using the spectrofluorometer. After the experimental conditions were optimized, a linear relationship was obtained covering the range of 1.0–56 μmol L−1 with a correlation coefficient of 0.9994. The developed method was applicable to routine trace determination of 2,6-DCP in real examples. This study also provides a general strategy to fabricate MIPs-coated QDs with excellent performance and is desirable for chemical sensor application.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Fengping Zhou,Ye Xiao,Meina Guo,Yetao Tang,Weihua Zhang,Rongliang Qiu
The increasing demand for rare earth elements (REEs) motivates the development of novel strategies for cost-effective REE recovery from secondary sources, especially rare earth tailings. The biggest challenges in recovering REEs from ion-adsorption rare earth tailings are incomplete extraction of cerium (Ce) and the coleaching of iron (Fe) and manganese (Mn). Here, a synergistic process between reduction and stabilization was proposed by innovatively using elemental sulfur (S) as reductant for converting insoluble CeO2 into soluble Ce2(SO4)3 and transforming Fe and Mn oxides into inert FeFe2O4 and MnFe2O4 spinel minerals. After the calcination at 400 °C, 97.0% of Ce can be dissolved using a diluted sulfuric acid, along with only 3.67% of Fe and 23.3% of Mn leached out. Thermodynamic analysis reveals that CeO2 was indirectly reduced by the intermediates MnSO4 and FeS in the system. Density functional theory calculations indicated that Fe(II) and Mn(II) shared similar outer electron arrangements and coordination environments, favoring Mn(II) over Ce(III) as a replacement for Fe(II) in the FeO6 octahedral structure of FeFe2O4. Further investigation on the leaching process suggested that 0.5 mol L–1 H2SO4 is sufficient for the recovery of REEs (97.0%). This research provides a promising strategy to selectively recover REEs from mining tailings or secondary sources via controlling the mineral phase transformation.
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PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 18
·7874-7878
·
IF 1.821
Yaping Zhong,Qingpu Wang,Yu He,Yili Ge,Gongwu Song
We developed a simple and sensitive room-temperature phosphorescence (RTP) method for the determination of graphene oxide (GO) in environmental water samples using amino-functionalized silica-encapsulated Mn/ZnS quantum dots (Mn/ZnS@SiO2-NH2) as a phosphorescent probe. The maximum phosphorescence excitation and emission wavelengths of the synthesized Mn/ZnS@SiO2-NH2 nanoparticles were 320 nm and 595 nm. The RTP intensity of the Mn/ZnS@SiO2-NH2 nanoparticles could be quenched in the presence of GO with a detection limit as low as 1.0 mg L−1. Good linear correlations were obtained over the concentration range from 0 to 10.0 mg L−1 with a correlation coefficient of 0.9987, and 10.0 to 25.0 mg L−1 with a correlation coefficient of 0.9979. The phosphorescence quenching mechanism was also discussed. This method was successfully applied to the determination of GO in environmental water samples which allows more opportunities for its application in biological and environmental systems.
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