JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Qiongqiong Luo,Shaoheng Wang,Dehua Cai,Ning Zhang,Dewen Zeng
A ZnSO4 electrolyte solution with impurity salts such as MnSO4 and MgSO4 is often used in zinc hydrometallurgical processes over a wide temperature range. CaSO4·2H2O(s) scaling and fluorine corrosion are two encountered problems in the process. Understanding the CaF2(s) solubility behavior in MSO4 (M = Zn, Mn, Mg) aqueous solutions at various temperatures helps remove Ca2+ and F– ions from the solution. However, CaF2(s) solubility data, especially at temperatures >298 K, have not been published yet. In this work, CaF2(s) solubilities in the CaF2–CaSO4–MSO4–H2O (M = Zn, Mn, Mg) quaternary systems and its subsystems of the CaF2–MSO4–H2O (M = Zn, Mn, Mg) at 348.15 K and the CaF2–CaSO4–MSO4–H2O (M = Zn, Mg) quaternary systems and the CaF2–MgSO4–H2O ternary system at 298.15 K are systematically measured. The results show that the CaF2(s) solubility in the MSO4 (M = Zn, Mn, Mg) aqueous solution of a certain concentration at 348.15 K is considerably higher than that at 298.15 K. At 298.15 and 348.15 K, the salting-in effect of MSO4 (M = Zn, Mn, Mg) on CaF2(s) solubility is enhanced with the order ZnSO4 < MnSO4 < MgSO4. At both temperatures, CaF2(s) solubilities in CaSO4·2H2O(s)- or CaSO4(s)-saturated MSO4 (M = Zn, Mn, Mg) aqueous solutions are generally lower than those in pure MSO4 (M = Zn, Mn, Mg) aqueous solutions. Particularly, the salting-in effect of MgSO4 on CaF2 is so strong that CaF2(s) dissolves completely and is converted to CaSO4·2H2O(s) and MgF2(s) in a concentrated MgSO4 aqueous solution. Hence, this study indicates that high temperatures and high salt concentrations increase the CaF2(s) solubility, making the removal of Ca2+ and F– ions from the system challenging. Further, the existence of impurity salts MnSO4 and MgSO4 makes it more difficult.
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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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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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TALANTA
·
2024
·
IF 5.6
Kexin Ren,Mengxia Duan,Tingting Su,Dichen Ying,Shijia Wu,Zhouping Wang,Nuo Duan
Shiga toxin type II (Stx2), the major virulence component of enterohemorrhagic Escherichia coli , is strongly associated with the life-threatening hemolytic uremic syndrome thus posing a substantial risk to food safety and human health. In this work, a dual-mode aptasensor with colorimetric and surface-enhanced Raman scattering was developed for Stx2 specific detection based on noble metal nanoparticles and Raman reporter loaded metal-organic framework (Mn/Fe-MIL(53)@AuNSs-MBA). The Mn/Fe-MIL(53)@AuNSs could catalyze the H 2 O 2 -mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB), thereby enabling visual detection. Meanwhile, the SERS signal from MBA can be enhanced by the decorated AuNSs. Under optimal conditions, a linear range of 0.05–500 ng/mL with limit of detection (LOD) of 26 pg/mL was achieved in colorimetric mode and a linear range of 5–1000 ng/mL with LOD of 0.82 ng/mL in SERS mode, in which the dual-mode results complement each other, widening the linear range, increasing the accuracy and reliability of the detection. The method was further applied to the detection of Stx2 in milk with average recovery of 101.1 %, demonstrating its superior potential for bacterial toxin monitoring.
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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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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Xiangyu Ding,Qingbo Zhou,Ziye Wang,Lei Liu,Yusong Wang,Tinglu Song,Feng Wu,Hongcai Gao
Among the potential cathode materials for sodium-ion batteries (SIBs), sodium manganese hexacyanoferrate (NaMHCF) has attracted great interest because of its open 3D framework, cost-effectiveness, and high voltage properties. However, NaMHCF synthesized by the conventional coprecipitation method has the disadvantages of high crystal water and high defects. Herein, through an effective regulation strategy, the strong chelation between organic complex manganese salt and Na4Fe(CN)6 can greatly slow down the nucleation rate of the coprecipitation reaction and prepare low defect, low water content, high crystallization cubic phase NaMHCF. In situ XRD analysis shows that the cubic phase NaMHCF has no phase transformation during repeated charge and discharge, which greatly reduced the deterioration of the cathode caused by Jahn–Teller (J–T) distortion of Mn3+. Moreover, ex situ XPS and time-of-flight secondary ion mass spectrometry (TOF-SIMS) verified that the cubic phase NaMHCF crystal structure has low water content and lattice defects, and shows superior cycle stability with a capacity retention rate of about 90% at 350 mA g−1 over 300 cycles and impressive rate performance, and can still work normally even in low temperature environments (−20 °C). This work has great potential in the research of high-performance cathode materials for sodium-ion batteries.
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Inorganic Chemistry Frontiers
·
2016
·Vol. 4
·期 1
·144-153
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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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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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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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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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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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