ChemCatChem
·
2026
·Vol. 18
·期 7
·e70719
·
IF 4.1
Xiaoxiao Wei,Xuemin Cao,Yuting Dai,Yujie Xie,Qingsen Qin,Li Li,Jinjia Liu,Jie Ren,Zhi Cao,Peng He
A series of promoter-doped Raney copper catalysts were prepared via a dealloying method, and their catalytic performance was evaluated in the reverse water–gas shift (RWGS) reaction. It was found that significantly improved CO 2 conversion and CO selectivity were achieved upon Mn doping over the catalyst. Mn existed in the form of a highly dispersed MnO phase, effectively regulating the electronic state and geometry of the active Cu component, thereby promoting the dissociation and adsorption of H 2 and the activation of CO 2 . Under optimized reaction conditions of a gas space velocity of 3000 mL·g cat −1 ·h −1 , a temperature of 600°C, and a Mn doping content of 5 wt%, the catalyst demonstrated a CO 2 conversion of 37.8% and a CO selectivity of 99.9%. Furthermore, after reaction at 600°C for 200 h, the catalyst retained high catalytic activity and structural stability, demonstrating promising prospects for practical application. This study provides crucial theoretical support and experimental evidence for designing highly efficient and stable Cu-based catalysts for the RWGS reaction. Graphical Mn-doped Raney copper catalysts were prepared by dealloying. The Mn promoter was uniformly and highly dispersed in the catalyst in the form of MnO, which enhanced the CO 2 adsorption capacity and H 2 dissociation capacity, thereby improving the catalytic performance of the RWGS reaction.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Wenting Jia,Lin Guo,Zhao Yu,Zhiqiang Li,Pengge Ning,Hongbin Cao
The growing stream of end-of-life lithium-ion batteries from electronic and mobility products has created a pressing need to manage solid residues generated during battery-recycling operations. In ammonia-based leaching flowsheets used for selective critical metal recovery, manganese-rich solid residues (e.g., MnCO 3 or ammonium manganese sulfite/sulfate) are intentionally formed to avoid complex purification. Yet they are often retained as low-value waste due to impurities from unreacted cores. Here, we demonstrate a waste-to-resource pathway that bypasses solution phase recovery by upcycling manganese-rich residues directly into a γ-MnOOH alkaline oxygen evolution catalyst. The residue with MnCO 3 as the main precursor delivers the best performance, with an overpotential of 457.65 mV at 100 mA cm −2 and a Tafel slope of 60.37 mV dec −1 , demonstrating a favorable comparison with commercial noble metal and other benchmarks using commercial transition metal salts as raw materials. Structure-activity analysis attributes the performance to the preferential expression of the high-index facet. This direct solid-state route avoids reagent-grade manganese precursors, eliminates gypsum-forming steps, and cuts life cycle economic and energy demand. The work illustrates a practical waste-to-resource strategy that strengthens manganese security and advances circular economy goals in clean energy technologies.
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Materials
·
2018
·Vol. 11
·期 8
·1323
·
IF 2.467
Yanlin Pan,Daoping Xiang,Ning Wang,Hui Li,Zhishuai Fan
Fine-grained W-6Ni-4Mn alloys were fabricated by spark plasma sintering (SPS) using mechanical milling W, Ni and Mn composite powders. The relative density of W-6Ni-4Mn alloy increases from 71.56% to 99.60% when it is sintered at a low temperature range of 1000–1200 °C for 3 min. The spark plasma sintering process of the alloy can be divided into three stages, which clarify the densification process of powder compacts. As the sintering temperature increases, the average W grain size increases but remains at less than 7 µm and the distribution of the binding phase is uniform. Transmission electron microscopy (TEM) observation reveals that the W-6Ni-4Mn alloy consists of the tungsten phase and the γ-(Ni, Mn, W) binding phase. As the sintering temperature increases, the Rockwell hardness and bending strength of alloys initially increases and then decreases. The optimum comprehensive hardness and bending strength of the alloy are obtained at 1150 °C. The main fracture mode of the alloys is W/W interface fracture.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 8
·716
·
IF 2.8
Wu Yuhan,Duan Guofan
We report the fabricating of BiFeO 3 (BFO) and Mn-doped BFO is prepared by the commonly used sol–gel method and obtained various excellent properties. X-ray diffraction patterns present that BFO is a pure phase and no impurities are detected and demonstrated that Mn is successfully doped into the BFO crystal structure. X-ray photoelectron spectroscopy analysis suggested that the extent of Mn doping in the samples and check the enhancement of Fe 3+ ions concentration in the nanoparticles. The results of scanning electron microscopy and transmission electron microscope indicated that the morphology and size of the nanoparticles with different Mn doping concentrations. The BFO nanoparticles exhibit weak ferromagnetic nature at general ambient temperature. However, the ratio of Mn ions to Fe ions changes to some extent, and the ferromagnetic behavior also changes, which is mainly due to the collapse of spin cycloid structure and the enhancement of super-exchange interaction between Fe–O–Fe, it can be inferred that Mn-doping has significant importance in increasing the ferromagnetic properties of BFO-based nanoparticles. The photocatalytic performance of Mn-doped BFO nanoparticles has also been further studied, which confirms the potential application value of Mn-doped BiFeO 3 in the field of photocatalysis.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 22
·10820-10828
·
IF 3.925
Die Hu,Weiquan Li,Ke Yin,Bichun Huang
Mn/TiO2 catalysts were synthesized using a deposition–precipitation method. Ru-doped Mn/TiO2 catalysts were prepared by an incipient-wetness impregnation method. To investigate the interaction between Ru and Mn species, the catalytic performance of Mn/TiO2 and Ru–Mn/TiO2 catalysts in the catalytic oxidation of chlorobenzene (CB) was evaluated. The physicochemical properties of the catalysts were characterized by XRD, HRTEM, XPS, EPR, H2-TPR, O2-TPD and so on. The results showed that the 0.8% Ru-10% Mn/TiO2 catalyst exhibited the best catalytic activity with 99% CB conversion at 250 °C and showed an excellent CO2 yield (95% at 300 °C) and stability. In comparison with the 10% Mn/TiO2 catalyst, the T90 of the Ru–Mn/TiO2 catalyst decreased by 60 °C, which was attributed to the interaction between Ru and Mn species at the interfaces of Ru/Mn. The Ru species increased the concentration of Mn4+ and Ru4+ and reduced the H2 reduction temperature, which was conducive to improving the redox performance of the catalysts. Ru species were highly dispersed on the Mn/TiO2 catalyst surfaces, forming a large number of Ru/Mn interfaces. The interaction between Ru and Mn species at the interfaces of Ru/Mn promoted the formation of oxygen vacancies and surface reactive oxygen species, thus enhancing the catalytic activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Qingxi Zhai,Hurong Ji,Yilun Ren,Hao Wu,Biao Wang,Fengqi Li,Yujie Ma,Xiangkang Meng
Designing and synthesizing high-activity, durable, and low-cost catalysts for the electrochemically transformation of water to hydrogen are vitally important to future energy systems . Herein, a simple but effective strategy for manganese-metal-heteroatom doping is adopted to intrinsically elevate the electrocatalytic activities of SnS 2 nanosheets by a facile two steps hydrothermal-sulfurization approach. Electrocatalytic hydrogen evolution (HER) performance of Mn–SnS 2 nanosheets grown on 3D nickel foam (Mn–SnS 2 /NF) is efficiently optimized since the dopants and defects endow the Mn–SnS 2 /NF vast active sites. An overpotential as low as 71 mV is required to drive a current density of 10 mA/cm 2 with a low Tafel slope of 72 mV dec −1 in alkaline environment (1 M KOH). In addition, the Mn–SnS 2 /NF exhibits prominent stability in 1 M KOH electrolyte, which is an indispensable index for the potential HER electrocatalysts . The present work demonstrates that the heteroatom manganese doping strategy renders a meaningful route for synthesizing cost-efficient HER electrocatalysts in alkaline condition.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lijun Niu,Lili An,Kaiting Zhang,Qian Chen,Xin Yu,Menglu Zhang,Mingbao Feng
The increased release of various emerging organic contaminants into natural waters has posed great threats to ecological safety and public health. The ensuing global water contamination has necessitated the development of highly efficient treatment strategies for water purification . Herein, we presented for the first time that the combined utilization of permanganate (Mn(VII)) and periodate (PI) could synergistically and rapidly accomplish complete destruction of different organic micropollutants (e.g., bisphenol F, methotrexate, and tetracycline) within 2–5 min. Comparatively, the single treatment only eliminated very small amounts of micropollutants. Mechanistic investigations were performed using the trapper-based electron spin resonance , scavenging and probe experiments, UV–vis spectra analysis, determination of iodine species, and multiple validation tests. These data collectively suggested that the highly reactive Mn(V)/Mn(VI) intermediates played the leading role in accelerating contaminant abatement within the Mn(VII)/PI oxidation system. Reactive oxygen/or iodine species ( 1 O 2 , OH, O 2 - , IO 3 , and IO 4 ) and low valence Mn species (Mn(II), Mn(III), and in-situ formed MnO 2 colloids) did not participate in decontamination in this process. Subsequently, the oxidized products of three micropollutants were determined, and the transformation pathways were clarified. Ring-opening, C-C bond cleavage, demethylation, carbonylation , and hydroxylation reactions mainly occurred in the degradation process. Notably, the combined system did not yield any toxic iodinated end products. Finally, the environmental risks of the degradation products were also evaluated based on in silico QSAR-based prediction tools. Overall, this study provides a novel, highly efficient, and green treatment technology, i.e., Mn(VII)/PI system, which could be employed for rapid and sustainable water decontamination.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ciyang Zhang,Xingen Xie,Shasha Feng,Wu Lei,Mingzhu Xia,Fengyun Wang,Hualai Wang
The novel CuMnS nanoflower fluorescent probe based on Mn-doped CuS was developed to achieve the fluorescence detection of oxytetracycline hydrochloride (OTC), the fluorescent sensor has good selectivity and stability. The doping of Mn significantly increased the fluorescence intensity of CuS, which was above 10 times that of CuS. When the predominant species of OTC molecule was zwitterionic OTC +/− at the solution pH of about 5.00, the fluorescence quenching efficiency of CuMnS by OTC reached the highest. Through fluorescence lifetime and UV absorption, the sensing mechanism between CuMnS and OTC was found to be static quenching. Moreover, Multiwfn wavefunction analysis program based on density function theory (DFT) calculation was applied to compare the interactions between different OTC species and CuMnS at different pH, to reveal the micromechanism of fluorescence quenching of CuMnS by OTC from the views of atoms. The molecular surface quantitative analysis and basin analysis of different OTC species demonstrated that the N atom and O atoms of tricarbonylamide moiety of zwitterionic OTC +/− can provide lone pair electrons to form a non-fluorescent ground state complex with CuMnS. Meanwhile, the electrostatic attraction of OTC +/− with negatively charged CuMnS was also beneficial to the interaction, resulting in the effective fluorescence quenching of CuMnS. This work offers a convenient method for sensitively detecting OTC and broadens the application of CuMnS in the field of fluorescence detection.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Xinbo Zhu,Haiping Xiong,Jin Liu,Yuting Gan,Zitan Xu,Chunlin Zhou,Yaolin Wang,Ye Jiang,Xin Tu
In this work, Fe–Mn based ternary catalysts (Fe–Mn-X, X = Ce, Co and Cu) were evaluated in the plasma-catalytic oxidation of ethylene oxide (EO) using a cylindrical dielectric barrier discharge (DBD) reactor. The addition of transition metal dopants to the Fe–Mn catalyst significantly improved the performance of plasma-catalyzed EO oxidation compared to the reaction using plasma only and the Fe–Mn catalyst. The highest EO conversion (91.9%) and CO 2 selectivity (78.9%) were obtained over the Fe–Mn–Co catalyst at a specific energy input (SEI) of 730.2 J l −1 . Moreover, the presence of water vapor improved EO conversion and CO 2 selectivity in the relative humidity (RH) range of 0–60%, while further increasing the RH to 80% reduced EO conversion. The interactions between Fe, Mn and dopants increased the specific surface area and pore volume of the Fe–Mn-X catalyst, while maintaining the crystalline structure of the catalysts. The presence of the dopants enhanced the reducibility of the Fe–Mn-X catalysts and produced more surface adsorbed oxygen (O ads ) on the catalyst surfaces. Moreover, the interactive effects among the Fe, Mn and dopants facilitated the plasma-catalytic oxidation reactions via enhanced surface reactions. The coupling of plasma with the Fe–Mn–Co catalyst reduced the formation of organic by-products in the plasma-catalyzed oxidation of EO.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Anlin Xu,Siyan Fan,Tong Meng,Ren Zhang,Yunhai Zhang,Shunlong Pan,Yongjun Zhang
Metal oxides, as a popular group of ozonation catalyst, are usually synthesized with physiochemical protocols involving hazardous materials and extreme conditions. In this study, a biological method was studied with manganese oxidizing bacteria Pseudomonas sp. to synthesize multi-metal oxides consisting of iron, manganese, and cobalt (Bio-FeMnCoOx) to catalyze ozonation for the first time. It was found that the dosage of cobalt, the cultivation time, and the polishing methods could significantly impact the catalytic activities of degrading benzotriazole as a model. The second-order degrading kinetic constant with optimized Bio-FeMnCoOx was 4.8 times that with the physiochemically synthesized peer. The activity of Bio-FeMnCoOx was compared with other reported catalysts in terms of Rct value. The quenching tests and EPR spectra indicated the participation of hydroxyl radicals, superoxide radicals, and singlet oxygen. The study demonstrates the great potential of biosynthesis as a green protocol for preparing metal oxides to efficiently catalyze ozonation.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tong Wei,Kai Lian,Jiaqi Tao,Hu Zhang,Da Xu,Jiachen Han,Chao Fan,Zihui Zhang,Wengang Bi,Chun Sun
Luminescent solar concentrators (LSCs) can be used as large-area sunlight collectors, which show great potential in the application of building-integrated photovoltaic areas. Achieving highly efficient LSCs requires the suppression of reabsorption losses while maintaining a high photoluminescence quantum yield (PLQY) and broad absorption. Perovskites as the superstar fluorophores have recently emerged as candidates for large-area LSCs. However, highly emissive perovskites with a large Stokes shift and broad absorption have not been obtained up to now. Here, we devised a facile synthetic route to obtain Mn-doped multiple quantum well (MQW) Br-based perovskites. The Br-based perovskite host ensures broad absorption. Efficient energy transfer from the exciton to the Mn dopant produces a large Stokes shift and high PLQY simultaneously. By further coating the perovskites with Al2O3, the stability and PLQY are greatly elevated. A large area of liquid LSC (40 cm × 40 cm × 0.5 cm) is fabricated, which possesses an internal quantum efficiency (ηint) of 47% and an optical conversion efficiency (ηopt) reaching 11 ± 1%, which shows the highest value for large-area LSCs.
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PubMed
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 3
·1-9
·
IF 1.81
Ding Feng,Lin Jing,Wu Tengyan,Zhong Hongbin
Magnetic nanoparticles were one of the most promising materials for targeted magnetic hyperthermia application due to the excellent magnetic properties. In this work, the magnetic nanoferrite of Mn 0.6 Zn 0.4 La x Fe 2− x O 4 ( x = 0.09, 0.1, 0.15, 0.2, 0.25 and 0.3) was synthesized by the hydrothermal method. Various physical properties of samples have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy and vibrating sample magnetometer. XRD results revealed that the lattice constants a t and crystallite size of the Mn–Zn nanoferrites decreased with increasing La 3+ content. The characteristic absorption bands of spinel nanoferrites and polyethylene glycol were observed in the FTIR spectra. FTIR results indicated that polyethylene glycol was coated on the Mn–Zn nanoferrites successfully. The saturation magnetization ( M S ), magnetic moment ( M r ) and anisotropy constant ( K ) were affected by La 3+ ion content. The M S of Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 was 58 emu/g, which could be potential hyperthermia in biomedical application.
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