TALANTA
·
2025
·
IF 6.1
Yin-Xia Sun,Xue Bai,Ai-Ping Luo,Yu Sun,Zhe-Peng Deng,Wan-Hong Sun,Wen-Yu Han
Quinolone antibiotics pose a threat to health and the environment due to their difficulty in decomposition and misuse. A novel fluorescence composite material CQD x @Co/Mn-MOF has been developed, which uses cobalt (Co) and manganese (Mn) as metal centers and 1,3,5-triazobenzene as organic ligands. Meaningfully, CQD x @Co/Mn-MOF can be designed as a ratiometric fluorescence sensor for detecting quinolone antibiotics, especially norfloxacin (NFX). In a series of CQD x @Co/Mn-MOF, CQD 6μL @Co/Mn-MOF sensor exhibits good linearity within the NFX concentration range of 1–4 × 10 −5 M, with a detection limit of 0.70 μM. Compared with Co/Mn-MOF, introducing CQDs significantly reduces the detection limit from 3.50 μM to 0.70 μM and increases the detection sensitivity by five times. The CQD 6μL @Co/Mn-MOF sensor exhibits fast response time (2 s), high selectivity and sensitivity to NFX, making it an ideal ratiometric fluorescent sensor for the detection of these antibiotics. Based on its excellent detection performance, the sensor was further applied to the quantitative determination of NFX in chicken, beef and honey samples and satisfactory results were obtained with recoveries ranging from 97.51 % to 108.60 %. In addition, based on CQD 6μL @Co/Mn-MOF test strips, convenient and real-time detection of quinolone antibiotics has been achieved. In conclusion, the CQD 6μL @Co/Mn-MOF ratiometric fluorescent sensor provides a reliable, sensitive and efficient analytical method for the detection and evaluation of trace NFX in food, which is of great significance for ensuring food safety and public health.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2025
·
IF 1.3
Lifen Meng,Yinying Zhang,Mengting Su
The determination of vitamin B6 (VB6) in food, health products, and pharmaceuticals is of great significance because it plays a crucial role in maintaining health and is a necessary condition for dietary intake. Therefore, the study uses L-Histidine, citric acid, potassium permanganate, and tetraethyl silicate as carbon source and Mn, Si source to prepare Mn, Si-CQDs by a hydrothermal method. The characteristics of the Mn,Si-CQDs are studied by TEM, XPS, FTIR, XRD, and UV-vis spectrum, Mn,Si-CQDs are spherical and well dispersed in aqueous solution, with an average particle size of 5 nm. The effect of different pH and storage time on the fluorescence intensity of Mn, Si-CQDs indicates that Mn, Si-CQDs have good fluorescence stability. The fluorescence of Mn, Si-CQDs can be selectively quenched by VB6 without being affected by interfering other substances, within the range of 0.05-20 μg/mL, The quenching degree ratio of Mn, Si-CQDs , F 0 /F, shows a good linear relationship with the concentration of VB6 (F 0 /F=0.19311+0.03723C (R 2 =0.99882)), with a detection limit of 0.037 μg/mL. The recovery rates were 94.21∼98.80% by the spiked recovery experiments, indicating the high sensitivity and selectivity of the Mn,Si-CQDs . During the antibacterial test, the Mn,Si-CQDs exhibite good antibacterial effects on Staphylococcus aureus, Penicillium, Escherichia coli and Saccharomyces cerevisiae .
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WATER RESEARCH
·
2017
·
IF 6.942
Erdan Hu,Ya Zhang,Shuyan Wu,Jun Wu,Liyuan Liang,Feng He
Mn(III) is a strong oxidant for one electron transfer , which may be important in the transformation of organic contaminants during water/wastewater treatment and biogeochemical redox processes. This study explored the reaction mechanisms of dissolved Mn(III) with organics. The role of dissolved Mn(III) either as a catalyst or an oxidant in reactions with organics was recognized. Aquo and/or hydroxo (or free) Mn(III), generated from the bisulfite activated permanganate process, facilitated efficient N-dealkylation of atrazine via a β-elimination mechanism, resulting no net redox reaction. In contrast, free Mn(III) degraded 4-chlorophenol via intramolecular redox processes, the same as hydroxyl radical ( OH), resulting in dechlorination , OH substitution, ring-opening and mineralization. Mn(III)-pyrophosphate compounds did not react with atrazine because complexation by pyrophosphate rendered Mn(III) unable to bond with atrazine, thus the electron and proton transfers between the reactants couldn't occur. However, it degraded 4-chlorophenol at a slower rate compared to free Mn(III), due to its reduced oxidation potential. These results showed two distinct mechanisms on the degradation of organic contaminants and the insights may be applied in natural manganese-rich environments and water treatment processes with manganese compounds .
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Sihan Wang,Xiaoli Zhu,Qingyi Meng,Pimiao Zheng,Jing Zhang,Zhiwei He,Haiyang Jiang
Accurate and rapid detection of foodborne pathogens is a key to prevent foodborne disease outbreaks. In this study, a novel impedance immunosensor based on a metal-organic framework (Mn-MOF-74) is used to rapidly and sensitively detect Listeria monocytogenes ( L. m ) in milk. Divalent manganese ions are released by the MOF reduction reaction mediated by hydrogen peroxide. Consequently, the impedance signal was detected by high conductive single-crystalline gold interdigitated microelectrode to achieve quantification of L. m . First, the capture antibodies (Ab 1 ) are modified on the surface of the magnetic beads to generate immunomagnetic beads (MBs@Ab 1 ), which are used specifically to separate L. m cells in the matrices. Later, the immunosensor (Mn-MOF-74@Ab 2 ) is added to the matrices to form a sandwich complex (MBs@Ab 1 - L. m -Mn-MOF-74@Ab 2 ). Henceforward, Mn 2+ is released from the sandwich composite via the action triggered by H 2 O 2 . The release of Mn 2+ significantly changes the impedance of interdigitated microelectrodes, leading to ultrasensitive detection of L. m . The recoveries for L. m cells at the concentration between 1.0 × 10 0 and 1.0 × 10 4 CFU/mL are 90.2%–101.7% in water and 88.5%–96.2% in milk. The detection limit of this approach for L. m cells in water and milk are 7.1 and 9.2 CFU/mL, respectively. This approach can achieve rapid quantification of L. m cells within 60 min, and can also be employed to monitor other foodborne pathogens.
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Catalysis Science & Technology
·
2015
·Vol. 5
·期 5
·2959-2972
·
IF 5.426
Ran Zhang,Li Guo,Chen Chen,Jizhong Chen,Angjun Chen,Xiuge Zhao,Xuerui Liu,Yuhe Xiu,Zhenshan Hou
A novel highly active Mn-doping ceria heterogeneous catalyst (MnOx–CeO2) was prepared and dedicated to the catalytic synthesis of aliphatic carbamates from CO2, aliphatic amines and methanol in one step. The as-obtained catalyst can attain a high yield of carbamate up to 82%, and can also be recycled at least four times through a simple procedure. It was observed that the Mn doping to ceria can alleviate the catalyst deactivation in consecutive catalytic recycles. In this regard, the role of Mn doping in the ceria in the synthesis of the aliphatic carbamates was investigated by means of X-ray diffraction (XRD), Raman spectra, specific surface areas (BET), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), CO2-temperature programmed desorption (CO2-TPD) and in situ diffuse reflectance infrared Fourier transform (DRIFT). The characterization demonstrated that the presence of MnOx in the ceria can not only inhibit the formation of stable carbonate species on the surface of the catalyst but also promote the decomposition/consuming of the carbonaceous species during the synthesis of aliphatic carbamates so as to allow improvement of the recyclability of the catalyst.
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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
·
2024
·Vol. 41
·期 3
·809-819
·
IF 1.8
Longwen Yang,Longwen Yang,Aochen Du,Aochen Du,Xingke Zheng,Xingke Zheng,Yun Ye,Yun Ye,Enguo Chen,Enguo Chen,Sheng Xu,Sheng Xu,Tailiang Guo,Tailiang Guo
All-inorganic perovskite quantum dots (PQDs) have excellent photoelectric performance, such as high photoluminescence quantum yield (PLQY), narrow full width at half-maximum (FWHM), and emission spectra covering the visible light wavelength. The emission color can be tuned over the full visible spectral region making them promising for white-light-emitting diodes (WLEDs). Further control over the optical and magnetic properties of PQDs can be achieved through doping of transition metal ions such as ${{\rm Mn}^{2 +}}$ ions. In this paper, a rapid doping method is employed at room temperature by using strong-acid cation-exchange resin during the metal ions doping process, which shortens the doping time, and ${\rm Mn}{:}{\rm CsPb}{({\rm Cl}/{\rm Br})_3}$ QDs were obtained. By controlling the reaction time between strong-acid cation-exchange resin and PQDs, we achieve different levels of manganese doping, resulting in a new, to the best of our knowledge, fluorescence peak at 600 nm. The introduction of strong-acid cation-exchange resin preserves the integrity of the PQD structure, while completing the doping within 30 min. Due to the low cost and mild reaction conditions of resin, it is expected that the ${\rm Mn}{:}{\rm CsPb}{({\rm Cl}/{\rm Br})_3}$ QDs can be mass-produced in large quantities. In addition, in order to provide high-quality white light emission, and prevent anion exchange reactions when mixed with ${{\rm CsPbBr}_3}$ QDs, the ${{\rm CsPbBr}_3}$ QDs are coated with silicon. Finally, by combining ultraviolet-light-emitting diodes (UVLEDs) with the aforementioned PQD mixture, this paper successfully fabricates WLEDs and demonstrates its excellent photoelectric performance. The constructed WLEDs produce warm white light with a high color rendering index (CRI) of 91 and a high correlated color temperature (CCT) of 5966 K, and the luminous efficacy (LE) of WLEDs is ${41}\;{{\rm lmW}^{- 1}}$.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Mingyang Feng,Bo Wei,Hai Kuang,Lushi Lian,Hongyu Dong,Xiaohong Guan
Bisphenols are a class of emerging pollutants frequently detected in drinking water with concentrations ranging from ng/L to μg/L. However, previous studies have typically investigated their degradation at much higher levels (mg/L), limiting the relevance of those findings to the actual scenarios. Given the persistent challenge of effectively removing bisphenols at environmentally relevant concentrations, the development of efficient treatment methods is critical. In this study, we investigated the performance and mechanism of removing 18 trace-level bisphenols from drinking water via a calcium sulfite (CaSO 3 )-coupling permanganate (Mn(VII)/CaSO 3 ) process. Trace-level bisphenols (1.0 μg/L) could be effectively removed by the Mn(VII)/CaSO 3 process at environmentally relevant pH ranges (6.0–8.5). Quantitative structure-activity relationship analysis demonstrated that the degradation rates of bisphenols in this process were strongly positively correlated with their average polarizability. Reactive manganese species were identified to play a dominant role in the degradation of bisphenols. The potential risks of bisphenols could be effectively reduced after degradation by the Mn(VII)/CaSO 3 system. Moreover, the removal of trace-level bisphenols was resistant to interference from the water matrix and efficient in real water samples. Overall, the findings of this study highlight the Mn(VII)/CaSO 3 system as a promising pre-oxidation process for controlling trace-level bisphenols in drinking water.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·42567
·
IF 3.9
Chen Dejun,Feng Jiawei,Guan Qingqing,Zhao Mengqi,Yuan Hao,Liang Xiaoyang
This study successfully developed Cu-Mn supported catalysts on fly ash geopolymer for the oxidative removal of toluene. The surface characteristics and catalytic performance of catalysts were systematically investigated in this paper. It was found that the Cu/Mn ratio plays a crucial role in determining the catalysts’ performance, with the Geo-3 catalyst showing the highest toluene conversion rate of 90% at 296 ℃. The catalyst also exhibited the lowest activation energy of 123.0 kJ/mol, indicating its superior catalytic efficiency. The findings not only contribute to the development of cost-effective and efficient catalysts for VOCs degradation but also provide valuable insights into the influence of the Cu/Mn ratio on the catalytic properties of geopolymer-supported Cu-Mn catalysts. This research offers a promising approach for the abatement of VOCs in industrial emissions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zonglin Pan,Xinyu Liu,Ruisong Xu,Xinyuan Zhou,Hang Yu,Lin Li,Yintao Yu,Chengwen Song,Tonghua Wang
Constructing high-performance catalytic membrane materials for addressing antibiotic wastewater pollution is of great significance. In this work, a Mn-doped FeOCl functionalized carbon catalytic membrane (CM-FM) was successfully fabricated by immobilizing a Mn-doped FeOCl catalyst onto a low-cost coal-based porous carbon membrane through a straightforward co-impregnation and calcination approach. A systematic investigation was conducted on the effects of key preparation parameters, including the doping ratio and precursor concentration. Results demonstrated that the CM-FM prepared with a Mn:Fe doping ratio of 1:8 and a precursor concentration of 7 wt% exhibited optimal catalytic performance. Under these conditions, the H₂O₂ decomposition efficiency reached 83.5 %, significantly higher than that of the pristine CM (14 %) and CM-FeOCl (78 %). Moreover, the removal efficiencies of tetracycline (TC) and total organic carbon (TOC) were considerably enhanced, achieving 97 % and 48.5 %, respectively. The influence of operational parameters on the catalytic degradation of TC by CM-FM was also examined, confirming its good applicability across different water matrices. Mechanistic studies revealed that Mn doping promotes the catalytic activation of H₂O₂ by the membrane, leading to increased generation of hydroxyl radicals (·OH) and singlet oxygen ( 1 O₂). Based on HPLC-MS analysis, potential TC degradation pathways during the catalytic process were proposed. Additionally, ECOSAR software was employed to evaluate changes in the toxicity of degradation products in the permeate solution after catalytic treatment, providing an assessment of the environmental impact reduction.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Qingyun Liu,Yi Wang,Tianzhao Hu,Shaorui Chen,Yaozu Wang,Hui Zhao,Wu Zhang,Zhigang Yuan,Yulian Wang,Zhenhua Sun,Feng Li
Achieving high energy density in aqueous asymmetric electrochemical capacitors hinges on the development of electrode materials that combine exceptional capacitance with superior conductivity. Despite its high theoretical capacitance, Ni(OH)2 is limited by low intrinsic conductivity, significantly limiting its performance. In this study, a Mn–Ni(OH)2@1T-MoS2 heterostructure was synthesized through a facile growth method, achieving significant electrochemical performance boost. The lattice matching at the heterointerface induces a controlled lattice expansion in Mn–Ni(OH)2, while the interfacial interactions promote electron transfer from Mn–Ni(OH)2 to 1T-MoS2. These synergistic effects enhance conductivity and active site utilization, addressing the core challenges of pristine Ni(OH)2. As a result, the heterostructure exhibits a high specific capacity of 244.2 mA h g−1 at 1 A g−1 and a rate capability of 51.4% at 12 A g−1. Moreover, the assembled asymmetric electrochemical capacitor delivers an energy density of 61.67 W h kg−1 at 600 W kg−1 and maintains 72.7% capacity retention after 10 000 cycles at 5 A g−1. This work not only highlights the critical role of heterointerfaces in enhanced electrochemical performance but also provides a robust strategy for designing high-performance energy storage systems.
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Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 11
·1-10
·
IF 4.3
Liang Haoting,Zhao Qiao,Liu Shengkun,Wei Chongyang,Wang Yidan,Wang Yue,Huang Shouying,Ma Xinbin
The Fe-Mn bimetallic catalyst is a potential candidate for the conversion of CO 2 into value-added chemicals. The interaction between the two metals plays a significant role in determining the catalytic performance, however which remains controversial. In this study, we aim to investigate the impact of tuning the proximity of Fe-Mn bimetallic catalysts with similar nanoparticle size. And its effect on the physicochemical properties of the catalysts and corresponding performance were investigated. It was found that closer Fe-Mn proximity resulted in enhanced CO 2 hydrogenation activity and inhibited CH 4 formation. The physiochemical properties of prepared catalysts were characterized using X-ray diffraction, H 2 temperature programmed reduction, and X-ray photoelectron spectroscopy, revealing that a closer Fe-Mn distance promoted electron transfer from Mn to Fe, thereby facilitating Fe carburization. The adsorption behavior of CO 2 and the identification of reaction intermediates were analyzed using CO 2 -temperature programed desorption and in situ Fourier transform infrared spectroscopy, confirming the intimate Fe-Mn sites contributed to CO 2 adsorption and the formation of HCOO* species, ultimately leading to increased CO 2 conversion and hydrocarbon production. The discovery of a synergistic effect at the intimate Fe-Mn sites in this study provides valuable insights into the relationship between active sites and promoters.
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Nano Research
·
2024
·
IF 9.5
Gao Li,Song Yang,Xu Xuebing,Li Chang,Hu Chaoquan
In this study, a Mn-modified Pt-based catalyst loaded on nitrogen-doped Ketjen black (Mn-Pt/NKB) is prepared using a simple ethylene glycol reduction method. The size of Pt nanoparticles (NPs) is effectively controlled by doping with Mn and N. With the smallest average particle size of 1.7 nm, Mn-Pt/NKB demonstrates half-wave potentials of 0.890 and 0.688 V in the alkaline and neutral electrolytes, respectively, which are superior to those of commercial platinum on activated carbon (Pt/C). When applied as an air cathode in aluminum-air battery, it exhibits ultra-high power densities of 190 (alkaline) and 26.2 mW·cm −2 (neutral). Moreover, the voltage remains stable after 5 h of discharge. The practical application performance of the Mn-Pt/NKB catalyst in an aluminum-air battery is better than that of commercial Pt/C. Furthermore, the oxygen reduction reaction (ORR) mechanism on surfaces with different particle sizes is analyzed using density functional theory. Oxygen cracking is the major pathway on the surface of the small particles with lower energy consumption of 0.5 eV, while water molecule cleavage is the major pathway on the surface of the large particles with higher energy consumption of 0.97 eV. The lower energy consumption of the oxygen cracking pathway further confirms the ORR mechanism for higher activity on small-sized surfaces. This study provides a direction for the rational design of Pt-based catalysts for ORR and sheds light on the commercial development of aluminum-air batteries.
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