Catalysts
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2025
·Vol. 15
·期 5
·419
·
IF 4
Longfei Xia,Xilin Wang,Jiahui Li,Dongyan Xu
Mn-based catalysts have been extensively studied in advanced oxidation processes based on peroxymonosulfate (PMS) oxidants, demonstrating their significant potential for treating antibiotic-contaminated wastewater. In this study, an amorphous MnO2-based composite catalyst (MnO2/CN@SiO2) was prepared and used to activate PMS for degrading levofloxacin (LEV). The effects of reaction conditions, such as reaction temperature, catalyst dosage, PMS concentration, and solution pH, on LEV degradation were comprehensively investigated. The interference of water components, e.g.,NO3−,SO42−, Cl−,CO32−, and humic acid, on the degradation efficiency of LEV was analyzed, and the stability of the catalysts was explored by cycling experiments. Finally, radical quenching experiments and electron paramagnetic resonance spectroscopy were employed to elucidate the contribution of active species to the degradation reaction process. A non-radical-based pathway for LEV degradation was proposed based on these results.
研究领域:
环境科学
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催化化学
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废水处理
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1553-1560
·
IF 3.174
Sibo Li,Jiaxun Zhang,Hualiang An,Guirong Wang,Xinqiang Zhao,Yanji Wang
BACKGROUND The reaction integration of butanal self-condensation and successive hydrogenation (that is, one-step synthesis of 2-ethylhexanol from butanal) is an efficiency way to simply process flow and reduce energy consumption for the commercial manufacture of 2-ethylhexanol (2EHO). In the present work, a NiO-MnO 2 /Nb 2 O 5 -TiO 2 catalyst was prepared for the integration reaction to reach a high 2-ethylhexanol selectivity. Furthermore, the reaction integration was investigated kinetically for the next scale-up. RESULTS A 2EHO selectivity of 90.0% was achieved at a complete conversion of butanal with the help of reduction-in-reaction technique in this reaction integration. The reaction rate of butanal is determined by the reversible aldol self-condensation reaction and its direct hydrogenation reaction. The reaction order with respect to butanal in the two reactions is, respectively, 2.004 and 1.004. The activation energy of the hydrogenation reaction is higher than that of the forward reaction of the self-condensation, suggesting the suppressive effect the reaction integration on the direct hydrogenation. CONCLUSION The reaction integration promotes butanal self-condensation and successive hydrogenation and it suppresses butanal direct hydrogenation by using NiO-MnO 2 /Nb 2 O 5 -TiO 2 catalyst with the help of reduction-in-reaction technique, giving rise to a pretty high selectivity of 2-ethylhexanol. The establishment of the integration reaction kinetics will lay the foundation for reactor design and analysis. © 2021 Society of Chemical Industry
研究领域:
化学工程
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催化化学
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反应动力学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xinshan Rong,Lu Zhang,Xiaoying Zhang,Jian Rong,Xiangtong Zhou,Haifei Chen,Shuang Liu,Fengxian Qiu,Zhiren Wu
Cross-weaved basalt fiber fabric (CBFF) woven from basalt fiber (BF), as a natural inorganic product, which presented a highly research value and widely application field, due to its high chemical stability, non-toxic, non-combustible and sound mechanical property. (Super)hydrophobic surface has recently received extraordinary attention, focusing both on novel preparation-used materials and application. In this work, cross-weaved basalt fiber fabric was synergistically decorated by MnO 2 nanosheets/stearic acid (SA) and the superhydrophobic inorganic/organic composite (CBFF@MnO 2 /SA) was obtained by hydrothermal processes. MnO 2 nanosheets self-assembled on the surface of CBFF (CBFF@MnO 2 ) presented honeycomb roughness with the micro/nanometer-sized spaces among the MnO 2 nanosheets. The water contact angles of CBFF, CBFF@MnO 2 and CBFF@MnO 2 /SA samples were 21.6, 120.0 and 155.5°, respectively. The result indicated that cross-weaved basalt fiber fabric exhibited an obvious superhydrophobic property after the modification by MnO 2 nanosheets and stearic acid. The as-prepared materials were applied in the simulation of oil/water separation and anti-icing process. Oil/water separation results not only displayed the separation efficiency up 95.0% by selective absorption for light oil/water system, but also showed the separation efficiency above 97.2% by filtration of oil for heavy oil/water system. Furthermore, CBFF@MnO 2 /SA could be used as the filter membrane in dynamic suction filtration device for oil recovery in oil spill accidents. Anti-icing experiments demonstrated that prepared CBFF@MnO 2 /SA had an obviously ice-over delay with the value of 166.6%.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A3972
·
IF 3.12
Yayun Zheng,Xiaodong Zhang,Yunrui Tian,Huaiping Zhang,Qingping Guo,Yaodong Zhang,Jujie Luo,Ziyan Li
MnO2 nanoparticles were rapidly grown on a carbon fiber cloth (CFC) substrate via microwave solid-state synthesis and used as an electrode material to improve the cycling stability of NiO battery-type supercapacitors. The morphology and electrochemical properties of NiO@CFC and NiO/MnO2@CFC composites were characterised, and the electrochemical properties of the electrode materials prepared under different feeding qualities and microwave conditions were compared. NiO/MnO2@CFC showed a high specific capacitance of 188.3 mAh/g at a current density of 1 A/g and excellent cycling stability (capacity retention of 88.4% after 2000 cycles); these results indicate that the MnO2 nanoparticles improve the cycling stability of CFC-supported NiO supercapacitors (37.8% capacitance loss after 1000 cycles). An asymmetric NiO/MnO2@CFC supercapacitor revealed a competitive energy density of 20.87 Wh/kg at a power density of 850 W/kg. The successful design and synthesis of these composites via the microwave-assisted solid-state method provides a novel strategy for preparing electrode materials for high-performance energy storage devices.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Yuanqing He,Chongyang Ma,Shiheng Mo,Chung-Li Dong,Wei Chen,Shuo Chen,Huan Pang,Ren Zhi Ma,Shuangyin Wang,Yuqin Zou
The electrochemical oxidation of 5-hydroxymethylfurfural (HMFOR) in alkaline electrolyte is a promising strategy for producing high-value chemicals from biomass derivatives. However, the disproportionation of aldehyde groups under strong alkaline conditions and the polymerization of HMF to form humic substances can impact the purity of 2,5-furandicarboxylic acid (FDCA) products. The use of neutral electrolytes offers an alternative environment for electrolysis, but the lack of OH − ions in the electrolyte often leads to low current density and low yields of FDCA. In this study, a sandwich-structured catalyst, consisting of Ru clusters confined between unilamellar MnO 2 nanosheets (S-Ru/MnO 2 ), was used in conjunction with an electrochemical pulse method to realize the electrochemical conversion of 5-hydroxymethylfurfural into FDCA in neutral electrolytes. Pulse electrolysis and the strong electron transfer between Ru clusters and MnO 2 nanosheets help maintain Ru in a low oxidation state, ensuring high activity. The increased *OH generation led to a groundbreaking current density of 47 mA/cm 2 at 1.55 V vs. reversible hydrogen electrode (RHE) and an outstanding yield rate of 98.7 % for FDCA in a neutral electrolyte. This work provides a strategy that combines electrocatalyst design with an electrolysis technique to achieve remarkable performance in neutral HMFOR.
研究领域:
电化学
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材料科学
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生物质转化
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Liping Hao,Shan-Shan Li,Jin Wang,Yang Tan,Lu Bai,Aihua Liu
Functional nanostructured transition metal oxides hold great promise in catalysis based sensors due to their superb catalytic activity, good stability, ease of preparation and cost-effectiveness. In this work, MnO 2 nanowires and MnO 2 /multi-walled carbon nanotubes (MWCNTs) nanocomposite were prepared via a simple hydrothermal method . The MnO 2 /MWCNTs nanocomposite was developed by deposition of MnO 2 on MWCNTs surface, which have abundant hydrophilic groups facilitating ion-adsorption and nucleation process. The MWCNTs/MnO 2 exhibited higher catalytic activity upon hydrogen peroxide (H 2 O 2 ) electrooxidation , with reduced overpotential by 100 mV and 220 mV in contrast to those values of MWCNTs and MnO 2 nanowires, respectively. Thus the MnO 2 /MWCNTs nanocomposite modified glass carbon electrode (GCE) enabled to detect H 2 O 2 sensitively. Moreover, by incorporation of glucose oxidase (GOx), a glucose biosensor GOx/MnO 2 /MWCNTs/GCE was prepared. The as-proposed biosensor had wide linear range (5–200 μM and 0.2–1 mM) and a low detection limit of 2 μM (S/N = 3), which could be applicable to detect real sample with satisfying accuracy and reproducibility. Due to the superb electrochemical properties, the as-developed MnO 2 /MWCNTs nanocomposite is prospected in electrochemical sensor, electrocatalysis and supercapacitor .
研究领域:
生物传感
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电化学
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纳米材料
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2025
·
IF 3.4
Aerzigu Xukeer,Jin Li
The ternary nanocomposite ZnO/MnO2/g-C3N4 was synthesized for room-temperature ammonia gas detection. Incorporation of g-C3N4 into the ZnO/MnO2 heterostructure significantly improved the composite’s sensing sensitivity at ambient conditions. g-C3N4 facilitated electron migration across the heterojunction interface, boosting conductivity, and provided abundant adsorption sites for ammonia molecules due to its layered structure. The ZnO/MnO2/g-C3N4 composite material exhibits outstanding ammonia sensing performance, with its detection sensitivity being 2.4 times that of the ZnO/MnO2 system. Notably, this material demonstrates rapid response and recovery characteristics, with recorded times of 7.3 and 1.6 s, respectively, thereby optimizing its functional performance and expanding its range of operational applications. The study found that the optimal doping ratio of ZnO/MnO2/g-C3N4 can effectively enhance the material’s specific surface area and electron mobility, thus improving its ammonia adsorption capacity and optimizing the sensor’s response and recovery characteristics. The synthesis employed a sequential two-step strategy: initial formation of a ZnO/MnO2 heterostructure followed by g-C3N4 integration. This approach effectively mitigated limitations of pure ZnO, including sluggish desorption kinetics and low response magnitude. Density functional theory (DFT) computations were employed to elucidate the atomic-level sensing mechanism, revealing significant charge redistribution at the ZnO/MnO2/g-C3N4 heterojunction interfaces upon ammonia adsorption.
研究领域:
材料科学
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传感器技术
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纳米材料
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表面化学
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气体传感
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-10
·
IF 5.479
Ma Zhangyan,Wu Tengteng,Li Peipei,Liu Meiling,Huang Si,Li Haitao,Zhang Youyu,Yao Shouzhuo
A fluorimetric and colorimetric method is described for the determination of glutathione (GSH) and silver (I). It is based on the use of MnO 2 nanosheets that were prepared by solution mixing and exfoliation. They display oxidase-mimicking activity and can catalyze the oxidation of o-phenylenediamine (OPD) to form yellow 2,3-diaminophenazine (DAP) with an absorption maximum at 410 nm. DAP also has a yellow fluorescence (with a peak at 560 nm). The MnO 2 nanosheets can be rapidly reduced to Mn 2+ by GSH. This reduces the efficiency of the oxidase mimic MnO 2 and causes a decrease in fluorescence and absorbance intensity. However, on addition of Ag + , a complex is formed with GSH. It prevents the destruction of MnO 2 nanosheets so that the enzyme mimicking activity is retained. A dual-method for the determination of GSH and Ag(I) was developed. It has excellent sensitivity for GSH with lower detection limits of 62 nM (fluorimetric) and 0.94 μM (colorimetric). The respective data for Ag(I) are 70 nM and 1.15 μM. The assay was successfully applied to the determination of GSH and Ag(I) in spiked serum samples.
Schematic presentation of a method for colorimetric and fluorometric determination of glutathione (GSH) and silver(I). MnO 2 nanosheets are reduced to Mn(II) by GSH. This reduces the enzyme-mimicking activity of MnO 2 nanosheets and causes a decrease in fluorescence and absorbance. On addition of Ag(I), the enzyme-like activity is increasingly retained. A decrease in fluorescence and absorbance is not observed any longer.
研究领域:
分析化学
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生物医学工程
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材料科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-11
·
IF 5.3
Tian Siyu,Wang Jiahui,Jie Yu,Ding Zhu,Wang Xiao,Wang Jijiang,Hou Xiangyang
A novel nanobiosensor was constructed by in situ locating nanometer MnO 2 particles with controllable size and morphology in a Zr-MOF substrate to serve as an electrochemical probe. The synergistic effect of the two components, Zr-MOFs with high specific surface area and compatibility as a carrier for MnO 2 , resulted in improved electrochemical activity and excellent electrochemical identification performance for the MnO 2 @Zr-MOF/GCE biosensor. Under optimized experimental conditions and using CV and DPV technology, the biosensor showed a wide linear detection range (2–200 μM), a low detection limit (2.577 × 10 −8 M), a recovery range (106.26–115.01%), and maximum relative standard deviation (5.155) for tetracycline (TC) identification. The recognition mechanism of the sensor was investigated adopting Laviron adsorption theory. The applicability of the sensor was verified through practical measurements. Overall, the MnO 2 @Zr-MOF/GCE sensor possesses the advantages of fast analysis speed, high sensitivity, high selectivity, and simple operation, making it suitable for detecting trace amounts of TC in food. Graphical abstract
研究领域:
分析化学
·
食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Dandan Song,Xinyu Jiang,Yanshan Li,Xiong Lu,Sunrui Luan,Yuanzhe Wang,Yan Li,Faming Gao
Transition metal oxides (TMOs) derived from metal − organic frameworks (MOF) combined with two-dimensional (2D) transition metal carbides possibly pave an innovative pathway for designing promising biosensors. Herein, a novel electrochemical sensing platform has been fabricated for ultra-sensitive determination of organophosphorus pesticides (OPs), based on MOF-derived MnO 2 /Mn 3 O 4 and Ti 3 C 2 MXene/Au NPs composites. Remarkably, the three-dimensional (3D) MnO 2 /Mn 3 O 4 hierarchical microcuboids derived from Mn-MOF are composed of vertically aligned, highly ordered nanosheets, and further combined with MXene/Au NPs yields synergistic signal amplification effect, with outstanding electrochemical performance, large specific surface area, and good environmental biocompatibility. Under the optimum conditions, the reported sensing platform AChE-Chit/MXene/Au NPs/MnO 2 /Mn 3 O 4 /GCE can be utilized to detect methamidophos in a broad concentration range (10 −12 –10 −6 M), together with a good linearity (R = 0.995). Besides that, the biosensor possesses a low limit of detection (1.34 × 10 −13 M), which far exceeds the maximum residue limits (MRLs) for methamidophos (0.01 mg/kg) established by European Union. Additionally, the feasibility of the proposed biosensor for detecting methamidophos in real samples has been demonstrated with excellent recoveries (95.2%–101.3%). Interestingly, the unique structures and remarkable properties of these composites make them attractive materials for various electrochemical sensors for monitoring either pesticide residuals or other environmentally deleterious chemicals.
研究领域:
材料科学
·
环境科学
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生物传感
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 46
·5542-5548
·
IF 2.896
Xinfa Cai,Meijuan Liang,Fei Ma,Sherif Ramzy Mohamed,Amira Abdel Goda,Dawood H. Dawood,Li Yu,Peiwu Li
A direct competitive nanozyme-linked immunosorbent assay (dcNLISA) based on MnO2 nanosheets (MnO2 NSs) as a nanozyme label was developed for the highly sensitive determination of fumonisin B1 (FB1). MnO2 NS-labeled fumonisin B1-bovine serum albumin was easily synthesized as a competing antigen for the dcNLISA. And color changes derived from the MnO2–3,3′,5,5′-tetramethylbenzidine (TMB) system were exploited as the output signals of the dcNLISA. Several experimental parameters including the concentrations of the coating antibody, pH values, ionic strength and methanol concentration were optimized. Under the optimal conditions, the proposed method demonstrated a linear range (1.17–20.74 ng mL−1) with a reliable correlation coefficient (R2 = 0.9989), a satisfactory limit of detection (0.63 ng mL−1) and high selectivity for the detection of FB1. The recoveries of FB1 in spiked corn and wheat samples were in the range of 85.31–108.16% with coefficients of variation (CVs) ranging from 6.14% to 9.23%. Meanwhile, the testing results showed good consistency (R2 = 0.9892) between the developed dcNLISA and the reference method, liquid chromatography/mass spectrometry/mass spectrometry (LC-MS/MS) method. The proposed method was proven to be simple, sensitive, cost-effective and reliable for the screening of FB1 in cereals.
研究领域:
食品科学
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分析化学
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生物技术
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 23
·8526-8534
·
IF 6.1
Fang Xu,Jialin Zheng,Dai-Huo Liu,Ao Wang,Zhenjiang Li,Chunyan Xu,Mengqin Song,Beinuo Zhang,Zhengyu Bai,Zhongwei Chen
Manganese dioxide is considered an ideal cathode candidate material for aqueous zinc-ion batteries. However, its poor conductivity and nanostructural degeneration impede its further application. Herein, a 3 × 3 tunnel-structured τ-MnO2 cathode material was synthesized through the addition of excessive Mg2+. During its preparation, a portion of Mg2+ was embedded into the 3 × 3 tunnel of τ-MnO2 to stabilize the microstructure, while another portion of Mg2+ formed a new phase, i.e., Mg2(OH)3Cl·4H2O, adjoining τ-MnO2, resulting in a cathode material with heterointerface synergy between τ-MnO2 and Mg2(OH)3Cl·4H2O. The charge arrangement of the heterointerface between τ-MnO2 and Mg2(OH)3Cl·4H2O enabled more active sites and accelerated ion-diffusion kinetics. The introduction of Mg2(OH)3Cl·4H2O increased the proportion of Mn(IV) and suppressed the structural instability caused by Jahn–Teller distortion, thereby improving the electrochemical performance of the τ-MnO2 cathode (capacity retention of 86.7% after 1800 cycles at 1 A g−1).
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）