JOURNAL OF COORDINATION CHEMISTRY
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2012
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IF 1.547
Li Zhang,Xiu-Ling Wu,An-Qi Wang,Fei Qin,Da-Wei Meng,Xiao-Yang Liu
A manganese(II) coordination polymer [Mn(TMB)2 · H2O]
n
(1) (HTMB = 3,4,5-trimethoxybenzoic acid) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction analysis, spectroscopic (IR, solid state UV-Vis), and thermal methods. The crystal belongs to orthorhombic system, space group P212121, with cell parameters a = 7.3001(8), b = 11.4146(13), c = 27.053(3) Å, α = β = γ = 90°, V = 2254.3(4) Å3, Z = 4. In 1, TMB in two different coordination modes bridges six-coordinate manganese(II) centers forming a 1-D infinite chain coordination framework. The spectral and thermal properties of the complexes have also been studied.
研究领域:
无机化学
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配位化学
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材料科学
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晶体工程
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DOI
高影响因子
Separations
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2025
·Vol. 12
·期 12
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IF 2.7
Meiqing Chen,Wenjie Dai,Yingying Liu,Guanzheng Zhuang,Yanfu Wei,Zhi Dang,Pingxiao Wu
Birnessite has a strong ability to fix rare-earth elements (REEs), but the transformation process of birnessite and its effects on the migration of these elements are not well understood. This study examines how pH and Mn(II) concentrations influence the transformation of cerium-adsorbed hexagonal birnessite (Ce/HB) and the behaviors of Ce and Mn. The results show that the effect of Mn(II) on Ce/HB transformation strongly depended on solution pH. At a pH of 5.0, HB initially underwent transformation into feitknechtite, followed by further disproportionation that resulted in the regeneration of HB and Mn(II). Concurrently, redox reactions occur between Mn(IV) in MnO2(a secondary phase of HB) and Ce(III)/Mn(II), creating a local redox gradient that facilitates partial HB transformation. At pH = 7.0, Mn(II) reduces the crystallinity of transformed products while enhancing the thermodynamic stability of feitknechtite, making it the dominant manganese oxide phase. At pH = 9.0, high-concentration Mn(II) causes lattice distortion in original HB; Ce(III) acts as a structural inducer, promoting mineral transition from hexagonal to orthorhombic symmetry, while excess soluble Mn(II) precipitates new feitknechtite. Additionally, surplus Mn(II) could engage in interfacial redox reactions with high-valent manganese oxides to generate secondary feitknechtite. Ce primarily exists as Ce(IV), forming CeO2on the mineral surface via oxidation reactions that significantly increase hydroxylation and surface reactivity. This study clarifies the transformation pathways of manganese oxides and the migration and transformation patterns of Ce and Mn in rare-earth-rich mining areas.
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高影响因子
Journal of Materials Chemistry C
·
2024
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IF 5.7
Tonghui Zhao,Yuqing Zhang,Lifei Wu,Qitong Zhong,Wei Xie,Bo Li,Dongling Geng,Haibo Zeng
In this research, we present an innovative, environmentally friendly, and cost-effective alcohothermal method for synthesizing Mn2+ and Mn2+–Cu+ doped 0D Cs3ZnCl5, a green luminescent material, marking the first time this approach has been reported. An exhaustive analysis of the luminescence properties of both undoped and doped Cs3ZnCl5 was conducted, with a particular emphasis on the energy transfer mechanisms in the Mn2+ mono-doped and Mn2+–Cu+ co-doped systems. The results demonstrate the successful construction of an efficient energy transfer pathway that significantly enhances the luminescence efficiency of Cs3ZnCl5:Mn2+. Specifically, the photoluminescence quantum yield of Mn2+ within the Cs3ZnCl5 matrix has been improved from 51.6% to 71.1%, thanks to the Cu+ codopant acting as an effective energy transfer mediator. A mechanism for the luminescence and energy transfer phenomena observed in the Mn2+–Cu+ co-doped Cs3ZnCl5 system has been also proposed. Furthermore, to assess the practical applicability of the synthesized materials, their structural and photoluminescent stability were evaluated. In essence, our study presents a promising solution to current challenges in the synthesis of advanced luminescent materials and opens up new possibilities for harnessing the potential of Mn2+-activated 0D metal halides in optoelectronic applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yong Suo,Quanwu Guo,Yutong Liao,Jianhong Luo
Inspired by the mechanical reciprocating movement, a novel active microchannel device (RCSM) utilizing segmented flow and cavity squeezing technique was designed for the enhanced extraction and separation of Mn (II). The experiment evaluated the separation efficiency of Mn (II) under different conditions from two aspects: static and movement states of the reciprocating plate, and the results showed that residence time was the main factor effecting the extraction efficiency. At the same time, the movement of reciprocating plate produced a cyclic flow between oil and aqueous phases, which effectively enhanced the mixing and internal mixing of the two phases, reduced the effective mass transfer distance, and increased the effective contact area. The thermodynamics calculations indicated that the additional enthalpy was generated by the movement of reciprocating plate. And the kinetics calculations indicated that inertial forces and interfacial tensions significantly acted in the formation, fragmentation, agglomeration, and mixing of oil ∼ aqueous phases droplets in the microchannel, ultimately leading to different results in the interface and fluid flow form of the oil ∼ aqueous phases. At both high and low flow rates, regular slug flows were observed at the outlet of the RCSM, and the fusion between adjacent slugs played a positive role in improving the efficiency of extraction. In addition, the total volume mass transfer coefficient (K L a) was calculated in this experiment to further reveal the mass transfer enhancement mechanism of RCSM. Compared with static experiments, dynamic experiments demonstrated stronger mass and heat transfer performance.
研究领域:
化学工程
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分离技术
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微流控技术
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高影响因子
Journal of Hazardous Materials Advances
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2026
·
IF 9.1
Beiping Zhang,Haixiang Sun,Kun Wang,Dawen Zha,Yankun Liu,Yuchao Tang,Xianhuai Huang
Ozone–activated carbon (O 3 /AC) systems are widely applied for the removal of soluble manganese (Mn(II)) in drinking water treatment. However, the underlying mechanisms remain poorly understood. In this study, the effects of granular activated carbon (GAC) and powdered activated carbon (PAC) on Mn(II) removal by O 3 were investigated. Mn(II) was rapidly removed by O 3 alone ( k obs = 0.069 s −1 ), whereas lower rate constants of 0.048 and 0.031 s −1 were observed in the O 3 /GAC and O 3 /PAC systems, respectively, at pH 7.0. Although increasing pH enhanced Mn(II) oxidation by O 3 alone, the inhibitory effect of PAC became progressively stronger from pH 7 to 9. The inhibitory effects of GAC and PAC on Mn(II) removal were closely associated with enhanced O 3 consumption, as demonstrated by O 3 decay experiments. Although hydroxyl radicals (•OH) and superoxide radicals (O 2 •⁻ ) were generated in the O 3 /GAC and O 3 /PAC systems, radical scavenging experiments demonstrated that these species contributed negligibly to Mn(II) oxidation. Overall, GAC and PAC enhanced O 3 consumption and reduced Mn(II) removal. These findings provide new mechanistic insights into the role of AC (especially PAC) in O 3 oxidation for Mn(II) removal and contribute to a deeper understanding of combined O 3 /AC oxidation processes.
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高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Han Qiao,Xiaoxiang Wang,Peng Liao,Cheng Zhang,Chongxuan Liu
A novel Mn(II) encapsulated mesoporous silica nanoparticles (Mn-MSNs) was developed for efficiently removing antibiotic tetracycline from aqueous solutions. The material has a well-ordered, hexagonal mesopore structure with a large specific surface area (720 m 2 /g) and maximum sorption capacity (229 mg/g) that is about an order of magnitude higher than that of mesoporous silica nanoparticles without Mn-encapsulated, or encapsulated with other transition metal cations Fe 3+ and Cu 2+ . Sorption results showed that the materials can sequestrate tetracycline within a large concentration range (5 μg/L–450 mg/L). Batch sorption experiment, spectroscopic analysis and density functional theory calculation collectively indicated that Mn–O complexation was the dominant mechanism for the tetracycline sorption. Electrostatic attraction and cation-π interaction also contributed to tetracycline sorption with their contribution levels varying with pH in a synergetic way with the Mn–O complexation. The Mn(II) encapsulated MSNs exhibited a good regeneration property over five repeated sorption-desorption cycles, demonstrating its promising potential in the cost-effective applications of sequestrating tetracycline from wastewater, drinking water , and contaminated solutions.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Laser & Photonics Reviews
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2025
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IF 10
Zhe Feng,Haixia Cui,Yurou Yan,Shujuan Liu,Qiang Zhao
X-ray imaging and detection technologies based on scintillators are extensively utilized in both medical diagnosis and industrial nondestructive inspection. However, traditional rigid planar scintillation screens are susceptible to vignetting and distortion problems because of the inhomogeneity of X-ray dose distribution. Flexible scintillation screens based on highly efficient metal-based halides can effectively solve the above-mentioned problems. In this work, a series of novel 0D Mn(II)-based halides ((C 5 H 5 N) 2 MnBr 4 , (C 7 H 10 N) 2 MnBr 4 , (C 8 H 12 N) 2 MnBr 4 and (C 9 H 14 N) 2 MnBr 4 ) are designed and synthesized with small-sized pyridine derivatives. Increasing the Mn–Mn distances through an alkyl chain modification strategy can effectively suppress the nonradiative transition and enhance exciton utilization, and thus their photoluminescence quantum yields (PLQYs) are significantly enhanced from 58.76% to 99.64%. (C 9 H 14 N) 2 MnBr 4 crystals with the highest PLQYs demonstrate superior X-ray scintillation properties with a high relative light yield of 57739 photons MeV −1 , which is 2.6 times higher than the commercial scintillators (LuAG: Ce). Moreover, the flexible scintillation screen composed of (C 9 H 14 N) 2 MnBr 4 and thermoplastic polyurethane achieves a high resolution of 17.8 lp mm −1 and is successfully applied for nonplanar objects to reduce image distortion. This work not only provides a strategy for improving PLQYs of Mn(II)-based halides but also demonstrates their practical applications for X-ray imaging of non-planar objects.
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高影响因子
ACS ES&T Water
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2025
·
IF 4.3
Wen-Long Wang,Peng-Hui Liu,Jung-Hyun Son,Hang Su,Min-Yong Lee,Hong-Ying Hu,Qian-Yuan Wu,Uwe Hübner
The combination of ozonation and Mn(II) (O3/Mn(II)) is expected to synergistically eliminate recalcitrant organic micropollutants in water. However, the decay of O3, formation of •OH and reactive manganese species (RMnSs), and synergism in micropollutant degradation have not been comprehensively understood. Herein, the synergism of O3 and Mn(II) was observed to be pH-dependent. Compared to ozonation alone, O3/Mn(II) preferentially formed Mn(V and VI) and slightly increased •OH yield (from 0.22 to 0.30) at acidic pH 4–5, while it preferentially formed Mn(VII) and significantly increased OH yield (from 0.52 to 0.74) at circumneutral pH 6–7. Thereafter, O3/Mn(II) prominently increased RMnS exposure at acidic pH, while it dramatically diminished O3-exposurse to increase •OH exposure at circumneutral pH. As a result, O3/Mn(II) outperformed ozonation alone for the degradation of various O3-resistant micropollutants (3.7–7.9 times faster). For example, the RMnSs (82.7% contribution) and •OH (84.2% contribution) were the dominant contributors to the degradation of the isothiazolinone biocide (5-chloro-2-methyl-4-isothiazolin-3-one) at acidic and circumneutral pH, respectively. Mn(II) can enhance the removal of O3-resistant micropollutants in relatively clean waters (e.g., tap water), but its effectiveness was limited in more contaminated waters (e.g., WWTP effluent). These findings support the practice and pH optimization of the O3/Mn(II) in various water types.
研究领域:
环境科学
·
水处理工程
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Liang Xu,Fenglian Fu,Peijing Yu,Guangzhao Sun
To efficiently treat hexavalent chromium (Cr(VI)) wastewater, K2FeO4 was used to remove and reduce Cr(VI) in presence of Mn(II) in this paper. Batch removal experiments were carried out to study the effect of Fe/Mn molar ratios, initial pH, in-situ and ex-situ and co-existing ions on Cr(VI) removal. The results showed the removal efficiency of Cr(VI) was 97.7% for the initial Cr(VI) concentration of 10.0 mg/L at Fe/Mn molar ratio of 2:3 and initial pH 8.0. Meanwhile, the high removal efficiency of Cr(VI) had been maintained throughout the pH range of 3.0–8.0 in the experimental study. Moreover, the removal process was relatively stable regardless of in-situ and ex-situ, and co-existing ions such as Ca2+ and low concentration of HCO3− had no intense effect on Cr(VI) removal, while SO42− inhibited Cr(VI) removal in the reaction system. To investigate the removal mechanism of Cr(VI) by K2FeO4 in presence of Mn(II), the reaction products were characterized by the Fourier transformed infrared spectrometer, X-ray powder diffraction, Transmission electron microscopy and the high-resolution X-ray photoelectron spectroscopy. The results indicated the ferrate decomposition products of γ-FeOOH/γ-Fe2O3 had the ability to adsorb Cr(VI) and react with Mn(II) to form γ-Fe2O3-Mn(II) complex to adsorb and reduce Cr(VI).
研究领域:
环境化学
·
水处理技术
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无机化学
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污染物修复
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DOI
高影响因子
WATER RESEARCH
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2021
·
IF 11.236
Yuan Gao,Yang Zhou,Su-Yan Pang,Jin Jiang,Yong-Ming Shen,Yang Song,Jie-Bin Duan,Qin Guo
In recent years, the activation of persulfates (peroxydisulfate (PDS) and peroxymonosulfate (PMS)) via transition metal ions for contaminants degradation has received extensive attention in water treatment. There has been growing interest on the mechanism (radical versus non-radical pathway) of activation processes. Interestingly, in contrast to copper, iron or cobalt ions regarded as effective activators for persulfates, manganese ion (Mn(II)) is inefficient for persulfates activation. Inspired by the enhanced stability of manganese species by ligands, this study for the first time systematically investigated the Mn(II)/persulfates with different ligands as a novel oxidation technology. UV-vis spectrometry, chemical probing method and mass spectrometry were used to explore the reactive intermediate (free radical versus high-valent manganese species) therein. It was surprisingly found that the oxidation efficiency of Mn(II)/ligand/persulfates system was highly dependent on the nature of persulfates and ligands. Mn(II) chelated by amino ligands such as ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetate (NTA) could efficiently trigger the oxidation of contaminants (e.g., recalcitrant compounds nitrophenol, benzoic acid and atrazine) by PMS , suggesting a promising Mn(II)/ligand/PMS technology for environmental decontamination especially under manganese-rich conditions. High-valent Mn species (Mn(V)) but not free radicals was demonstrated to be the dominant reactive intermediate, where Mn(III) species played a vital role in Mn(V) generation. The formation of Mn(III) species was found to be affected by the reactivity of persulfates and the type of ligands, thus influencing its further oxidation to Mn(V) species. This study presents a new oxidation process based on the combination of PMS and Mn(II) complex and broadens the knowledge of persulfates activation as well as manganese chemistry for decontamination in water treatment.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
PubMed
高影响因子
GEOCHIMICA ET COSMOCHIMICA ACTA
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2021
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IF 5.01
Jing Liu,Sayako Inoué,Runliang Zhu,Hongping He,Michael F. Hochella
It is recognized that different facets of minerals vary distinctively in their chemical reactivity with aqueous solutions. However, detailed molecular and atomistic understandings of these phenomena are relatively limited. This study investigated the interaction of aqueous Mn 2+ and dissolved oxygen on various facets of two morphology-types of iron oxide (hematite) nanocrystals. These interactions result in the oxidation of Mn(II) and heterogeneous growth of Mn(II)/Mn(III) and Mn(III) oxides. The nanoscale morphology and atomic structure of the manganese oxide products were characterized in detail. Our results, for the first time, directly demonstrate the facet-specific oxidation of Mn(II) and nucleation of Mn(II/III) oxides, followed by their epitaxial growth on hematite. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron diffraction measurements reveal the growth of MnO x nanowires on {1 1 3} of hematite nanoplates (HNP) and {0 1 2} facets of hematite nanocubes (HNC), while the basal {0 0 1} facets on the HNP particles do not produce precipitates. The average oxidation states of the MnO x on HNP and HNC determined using electron energy-loss spectroscopy (EELS) show that both Mn(II) and Mn(III) are present. The mineral composition and growth mechanisms of MnO x catalyzed by HNP and HNC are similar. High-resolution TEM analysis reveals the presence of both hausmannite and manganite on HNP and HNC. The crystallographic relationship between the heterogeneously formed manganite with hematite, which has not been reported before, proves that hematite provides reaction sites and can function as an atomic template for the formation of MnO x nanowires. These findings advance our understanding of the redox chemistry and heterogeneous growth of minerals as controlled by the surficial structure of the substrate mineral. This has important geochemical implications as the catalytic growth of less common, highly reactive phases like MnO x are known to be consequential in complex natural and anthropogenic environments.
研究领域:
矿物学
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地球化学
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2021
·
IF 8.198
Weiquan Zhan,Yuan Yuan,Xin Yao,Bingqiao Yang,Feifei Jia,Changsheng Lin,José Luis Arauz-Lara,Shaoxian Song
Developing efficient materials for the extraction of gold(I) was pivotal for application of ammoniacal thiosulfate leaching technology. Mn-doped molybdenum disulfide (Mn-MoS2) spheres were fabricated by a facile hydrothermal route for photocatalytic reduction of the gold(I) thiosulfate complex ([Au(S2O3)2]3–) in this work. The experimental results exhibited that [Au(S2O3)2]3– was efficiently recycled in the form of gold nanoparticles by Mn-MoS2. The reduction capacity (936.9 mg/g) and rate (2.74 mg/(g min) in 300 min) was 1.5 and 2.72 times higher than that of MoS2, respectively. The inside photocatalytic reduction mechanism was studied by combining an experimental and first-principles approach. Outstanding reduction performance of [Au(S2O3)2]3– was attributed to the enhanced transfer of photoinduced electrons after Mn doping. In addition, S atoms in the Mn-S bond could well interact with Au(I), which slightly promoted the adsorption of [Au(S2O3)2]3– on Mn-MoS2. The discovery provided a promising strategy for the efficient extraction of gold(I) from thiosulfate leaching solutions.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）