FUEL
·
2022
·
IF 8.035
Haoyu Huang,Xin Hu,Zhuoran Hou,Di Yang,Dan Xiang,Liwen Hu
The hydrogen is described as a clean and sustainable alternative to fossil fuels in numerous energy systems. Hydrolysis is an important method for high purity, high volume hydrogen production. In order to accelerate the kinetics of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, it is essential to explore efficient catalysts. In this paper, the nanoscale self-supported Mn-NiS/Mn-Ni 3 S 4 composite catalysts was assembled on nickel foam. Benefiting from the lattice distortion and vacancy defects caused by the doping of Mn elements, the catalysts exposed an increasing number of electrochemical surfaces and effective active sites, showing impressive electrochemical performance with a HER overpotential of only 94.2 mV at 10 mA/cm 2 and an OER overpotential of only 253 mV to drive 50 mA/cm 2 . Applying as the bifunctional catalysts, the Mn-NiS/Mn-Ni 3 S 4 couple only achieved a low voltage of only 1.52 V to drive 10 mA/cm 2 . This paper provides new ideas and references for the rational design of high-performance sulfide catalysts with non-precious metal composites.
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高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1651-1672
·
IF 3.6
Zhang Lei,Zou Zhuorui,Lei Zhang,Jia Yang
In this research, xylene was utilized as a simulated gas, γ-Al 2 O 3 pellets were selected as catalyst carriers, and FeO x , MnO x , CeO x , and CuO x were used as active components to analyze the synergistic treatment of VOCs–O 3 by low-temperature plasma combined with supported catalysts. Different metal oxides and other factors influence the synergistic treatment of VOCs–O 3 . The results showed that the catalytic effect of Fe–Mn/γ-Al 2 O 3 prepared by the equivalent volumes of consecutive impregnation method was better than that of Fe–Mn/γ-Al 2 O 3 prepared by co-impregnation method. When combined with low temperature plasma technology, high-energy electron collision reaction and oxidation reaction between free radicals occurs, which played a synergistic role in the degradation of VOCs–O 3 . The total removal rate of xylene was 94.88%, and the depletion rate of ozone was 84.1%.
研究领域:
環境科學
·
化學工程
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Chunyan Zhang,Jiaxing Luo,Shaojun Sun,Kailing Yuan,Mingxin Ran,Chuanhua Li,Xuemin Yan
The most crucial part of electrolyzing water lies in the design and preparation of the catalyst. Manganese-doped metal phosphides are often studied as catalysts for water electrolysis due to their outstanding dual-function properties. In this paper, a two-step method of in-situ hydrolysis and low-temperature phosphating is provided to prepare manganese-doped tri-metallic nickel-cobalt-based phosphides ((Mn)CoP 2 /NiCoPs) ultrafine nanoparticles. It is found that the addition of manganese led to a reduction in the unit cell size of NiCoP and CoP 2 in the catalyst. As the amount of manganese element in the raw materials increases, the doping amount of manganese in the catalyst shows an upward trend. In 1 M KOH, (Mn)CoP 2 /NiCoP-2 with the manganese doping content of 0.35 wt% shows the overpotentials of 52 mV for hydrogen evolution reaction (HER) and 141 mV for oxygen evolution reaction (OER) to achieve 10 mA cm −2 . For total hydrolysis reaction, it requires an overpotential of only 1.50 V in 1 M KOH and 1.48 V in simulated seawater environment. Compared with pure Co 2 P/NiCoP, the catalytic activity of (Mn)CoP 2 /NiCoP-2 is higher. This can be attributed to the doping of manganese, which reduces the oxygen content and particle size of the catalyst, and also optimizes its electronic structure.
研究领域:
电催化
·
材料科学
·
能量转换
·
纳米材料
·
水分解
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高影响因子
GREEN CHEMISTRY
·
2026
·
IF 10.6
Lei Yang,Jiacheng Gao,Min Su,Li Yua,Yuan Wang,Dajun Wang,Heng Zheng,Shaojun Yuan,Like Ouyang
The depolymerization of waste polyethylene terephthalate (PET) has predominantly focused on zinc-based catalysts, benefiting from their stable Lewis acidity derived from unique 3d orbital electronic configurations. In contrast, manganese-based catalytic materials, which share similar electronic structural features, have rarely been explored. This study developed a synergistic catalytic system using commercially available, low-cost homogeneous MnCl₂·4H₂O and heterogeneous Mn₂O₃ for the methanolysis of PET which achieved complete PET conversion within 1 hour at 180°C with a dimethyl terephthalate (DMT) yield of 95.35%. Compared with other catalytic systems for PET depolymerization, the present system uniquely integrates the capability of homogeneous Mn²⁺ ions to rapidly activate methanol and swell PET with the structural stability and ease of recovery inherent to the heterogeneous Mn₂O₃ oxide. Through systematic in-situ and ex-situ characterizations (XRD, XPS, in-situ DRIFTS, etc.), it was revealed that the essence of the synergistic effect originates from a dynamic composite active center formed at the interface between Mn²⁺ and Mn₂O₃, which efficiently stabilizes key reaction intermediates and promotes product desorption. Aspen Plus process simulation and economic analysis further validate its industrial potential: although the synergistic system introduces an additional step for homogeneous catalyst recovery, its superior product yield and lower activation energy grant it significant economic advantages and industrial potential. In summary, this work establishes a novel homo-heterogeneous catalytic system, offering a strategic approach to develop efficient and scalable solutions for polyester degradation.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Jing Wang,Siyu Zhang,Lidong Kou,Kunzhen He,Qingyuan Li,Chaojun Wu,Xing Xing,Yanjin Wang
NaBiO 3 is a low-cost photocatalyst with good performance for organic removal. Oxygen vacancies (OVs) play crucial roles in mediating oxygen activation and electron-hole separation during visible light-driven photocatalysis. In this study, Mn ions were doped into the commercial NaBiO 3 by a facile in-situ technique to construct OVs for enhancing sulfamethazine (SMT) removal. By doping 0.001–0.01 mmol of Mn 2 + ions, abundant OVs were formed on the initial NaBiO 3 surface, endowing the as-prepared BiMn x composites (e.g. BiMn 0.001 ) with a fast kinetic (first-order rate constant k 0.68 h −1 ) and a high efficiency (>99 % within 6 h) for SMT degradation. Excellent removal of SMT could be attained across a broad pH range (i.e. pH 0 5–9) using BiMn 0.001 as the photocatalyst, which could harvest full-spectrum LED white light and showed anti-interference to common water co-existent constituents. Increasing solution temperature was also beneficial for SMT removal. Reactive species including 1 O 2 , holes and electrons played dominant roles for SMT removal. Based on HPLC-MS, the degradation intermediates were identified, and a degradation pathway for SMT was formulated in the BiMn x /LED system. The results may shed some light for constructing OVs on catalyst surfaces and preparing LED visible light-responsive photocatalysts for antibiotic removal.
研究领域:
环境科学
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材料化学
·
催化化学
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Advanced Optical Materials
·
2024
·Vol. 12
·期 34
·2401591
·
IF 8
Cheng Luo,Juntao Li,Ruiling Zhang,Peigeng Han,Jianyong Liu,Bin Yang
Strong Mn─Mn coupling interactions, including dipolar and exchange interactions, significantly affect the photoluminescence quantum yields (PLQYs) in Mn 2+ -based luminescent materials. However, clarifying the individual effects of dipole–dipole and exchange interactions on photoluminescence (PL) is challenging because these interactions may have similar effects on PL properties, and there is a lack of materials with precisely tunable Mn─Mn distances over a wide range. In this study, the influence of dipolar and exchange coupling on PLQY is quantitatively decoupled by designing a series of hybrid manganese chlorides single crystals with a wide tuning range of Mn─Mn distances, from 6.0 to 9.5 Å. It is found that the PLQY can be enhanced from 2.1% to 57.1%, and the PL lifetime increased from 0.21 to 3.81 ms as the Mn─Mn distance increased. This enhancement is solely attributed to the decreased energy transfer dominated by dipole–dipole interactions. At the shortest Mn─Mn distance of 6 Å, exchange coupling becomes dominant, resulting in an additional red-side PL band with negligible effects on PLQY and lifetime. This work provides valuable insights into the mechanisms underlying the regulation of PLQY in Mn 2 ⁺-based luminescent materials.
研究领域:
材料科学
·
光学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Boxiong Zhang,Wenxiong Dong,Yaowu Wang,Xiaomeng Cao,Jianping Peng,Yuezhong Di,Buju Guo,Zhongyu An,Jiaoyang Xia
Alkaline zinc–manganese batteries are the most used disposable batteries in the world and cannot be recharged. Spent alkaline zinc–manganese batteries are mainly disposed of in landfills, and the resulting enrichment of the soil with potassium(K), zinc(Zn), and manganese(Mn) pollutes the groundwater and wastes valuable resources. Herein, a process for the treatment of used alkaline zinc(Zn)–manganese(Mn) batteries that involved water leaching, calcination, and vacuum aluminothermic reduction was developed. Investigation of the elemental migration process and reaction mechanism showed that the purity of potassium carbonate(K 2 CO 3 ) reached 99 % with 92.1 % recovery at a water leaching temperature of 60 °C and time of 25 min. The leaching slag was calcined at 700 °C for 1 h to obtain calcined slag with zinc oxide (ZnO), manganese(III) oxide (Mn 2 O 3 ), and manganese(II) oxide (MnO) as the main phases. When the calcined slag was reduced with aluminum powder, the recovery rate of Zn reached 99.7 % at a reduction temperature of 1100 °C, reduction time of 2 h, and ratio of aluminum powder to calcined slag of 1.5:1. Under these conditions, Mn was recovered in the form of Al 6 Mn alloy, and the main phase of the remaining reduced slag was alumina. In this study, potassium and metallic zinc were separated and recovered, and at the same time, an aluminum(Al)–manganese(Mn) alloy was prepared. The developed environmentally friendly and emission-free process enables the efficient recycling of the valuable resources K, Zn, and Mn, resulting in cleaner battery disposal.
研究领域:
冶金学
·
环境工程
·
材料科学
·
化学工程
·
电池技术
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Light-Science & Applications
·
2026
·Vol. 15
·期 1
·90
·
IF 23.4
Zhou Guojun,Wang Pei,Ren Qiqiong,Zhang Nan,Lv Jin,Mao Yilin,Qiao Jianwei,Zhang Xian-Ming
Magneto-optical coupling provides a powerful alternative to crystal field engineering for modulating Mn 2+ luminescence. However, precise control over Mn–Mn coupling is hindered by the complex spin-electron super-exchange interactions. Herein, we report a symmetry-broken Mn(II) chloride dimer, (C 10 H 20 O 5 Mn)(CH 3 CN)MnCl 4 , synthesized through a crown-ether-assisted supramolecular strategy. The dimer features a 7-coordinated pentagonal bipyramid and a 4-coordinated tetrahedron linked by a distorted Mn–Cl–Mn bridge (129°), which promotes rare spin-canted Mn–Mn coupling and creates a novel Mn–Mn luminescent center. This center exhibits a red emission at 638 nm with an unusually short lifetime of 0.42 ms, which is attributed to the relaxation of spin-forbidden d – d transitions. Notably, the emission undergoes a 30 nm blue-shift upon heating (5–305 K) due to the thermal suppression of spin-canting, and a 40 nm blue-shift under applied pressure (0–20 MPa) resulting from reduced orbital overlap. This dual-responsive luminescence originates from spin-canted weak ferromagnetism, which induces a rearrangement of energy-levels by separating antibonding orbitals. Using this effect, we have demonstrated an optical manometer for real-time underwater depth sensing. These findings highlight spin-canted Mn(II) dimers as a promising platform for stimuli-responsive luminescence and reveal a new mechanism for d–d transition modulation.
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PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Zhicheng Liao,Huan He,Danni Cui,Jingye Cui,Xiaoxia Yang,Ziwei Guo,Hao Chen,Guohua Dao,Bin Huang,Hongwen Sun,Xuejun Pan
Algal extracellular organic matter (EOM), a major fraction of the dissolved organic matter found in eutrophic plateau lakes, can act as a photosensitizer to drive the abiotic oxidation of Mn(II). This process has the potential to generate reactive Mn(III) and influence the fate of organic pollutants. In this study, the photodegradation of 17α-ethinylestradiol (EE2) in the presence of Mn(II) and EOM was investigated with emphasis on the photogeneration mechanism of Mn(III). The results indicated that Mn(II) can accelerate EE2 photodegradation in EOM solution owing to the photogeneration of reactive Mn(III), and the enhancement was greater at higher Mn(II) concentrations. The generation of reactive Mn(III) was mainly attributable to the action of superoxide radical generated by photosensitization of EOM. In addition, the photodegradation of EE2 was slower at higher pH, possibly because of the deactivation of Mn(III) under alkaline conditions. Single-electron transfer was an indispensable process in the photodegradation. The differences in fluorophore content, pH, and NO 3 − concentrations are all important determinants for EE2 photodegradation in natural waters. The information obtained in this research would contribute to the understanding of reactions between Mn(II) and EOM, and provide new insights into the behaviors of reactive Mn(III) in eutrophic water irradiated by sunlight.
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PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Shule Duan,Huiyu Dong,Pin Hou,Gangsheng Han,Bochao Zhang,Zhimin Qiang
Permanganate (Mn(VII)) is a widely used oxidant in water treatment , which can oxidize trace organic contaminants (TrOCs) and Mn(II). Interestingly, this study found that presence of Mn(II) could accelerate the abatement of bisphenol A by Mn(VII) only under oxic condition . Herein, the effects of Mn(II) and dissolved oxygen (DO) on the abatement of TrOCs by Mn(VII) oxidation and the related mechanism were investigated. Results indicate that DO was involved in the Mn(VII)/Mn(II) reaction, with the reaction stoichiometry of Δ[Mn(VII)]:Δ[Mn(II)] determined to be 1:2 and 1:1.5 in the presence and absence of DO, respectively. Quenching and electron paramagnetic resonance tests verified that both superoxide radicals (O 2 •− ) and reactive Mn species contributed to the accelerated abatement of TrOCs (bisphenol A, methyl phenyl sulfoxide, and methyl phenyl sulfone) in the Mn(VII)/Mn(II) process. Specifically, O 2 •− was produced through the one-electron reduction of DO and made an important contribution (32.4%–100%) to the abatement of selected TrOCs. This study reveals that Mn(II) could enhance TrOC abatement by Mn(VII) oxidation, and DO played a pivotal role in the Mn(VII)/Mn(II) process.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yiqing Liu,Ting Wang,Zhengjie Chen,Shenglan Liu,Yongsheng Fu
Currently, the research on bisulfite (BS) activation by Mn(II) is very limited probably because of the low catalytic efficiency of Mn(II). Adding ligands to Mn(II)/BS system is likely to improve the BS activation, but the relative information is very rare. Therefore, the effect of nitrilotriacetic acid (NTA) on Mn(II)/BS system was investigated in this work using sulfamethoxazole (SMX) as the target contaminant. The results showed that the addition of NTA enhanced SMX removal in Mn(Ⅱ)/BS system through forming Mn(Ⅱ/III)-NTA complexes driving Mn(III)/Mn(II) cycle and stabilizing Mn(III). Alcohol scavenging experiments and competitive kinetic experiments indicated that sulfate radical (SO 4 •− ) and hydroxyl radical (HO • ) were not the main reactive species in Mn(II)/NTA/BS system. Mn(Ⅲ) was the primary oxidant for SMX elimination in this system and its existence was proved by UV-Vis absorption spectrum of reaction solution. Mn(Ⅱ)/NTA/BS system could greatly degrade SMX in near-neutral conditions, while nearly no SMX removal was observed at pH 3.0. The decrease of dissolved oxygen concentration significantly inhibited BS autocatalytic stage, thus suppressing the removal of SMX. Due to the competitive complexation of HCO 3 − and FA with NTA for Mn(II), their addition in Mn(Ⅱ)/NTA/BS system obviously inhibited SMX degradation . Four intermediates were detected during SMX degradation in Mn(Ⅱ)/NTA/BS system, and the possible SMX transformation pathways were speculated as N-S bond breaking, hydroxylation, amino oxidation and coupling reaction.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Hongzheng Wu,Ruosheng Zeng,Zifang Tang,Yunlong Bai,Shuai Zhang,Yarui Dai
Organic-inorganic hybrid metal halides hold considerable potential for diverse applications, including light-emitting diodes, display diodes, liquid crystal displays , and photodetectors , owing to their exceptional optical properties . Herein, we successfully synthesized lead-free zero-dimensional (0D) (C 13 H 22 N) 2 MnCl 4 metal halide single crystals with green emission, employing an anti-solvent method. The (C 13 H 22 N) 2 MnCl 4 single crystals, featuring four-coordinated Mn 2+ , exhibit pronounced green emission at 528 nm and demonstrate a photoluminescence quantum yield (PLQY) of approximately 72 %. This emission is attributed to the 4 T 1 (G)- 6 A 1 (S) transition and the considerable Mn–Mn spacing distance between adjacent [MnCl 4 ] 2- tetrahedra. The photoluminescence spectra during thermal cycling underscore the exceptional optical stability of the (C 13 H 22 N) 2 MnCl 4 material. These organic-inorganic hybrid manganese halides emerge as a compelling and novel candidate for future light-emitting diode materials.
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