MOLECULES
·
2024
·Vol. 29
·期 12
·2868
·
IF 4.2
Tingjin Xu,Lu Fan,Zhaokun Xiong,Bo Lai
Fe/Cu bimetallic catalysts have a synergistic effect that can effectively enhance catalytic activity, so Fe/Cu bimetallic catalysts have been extensively studied. However, the efficacy and mechanisms of Fe/Cu bimetallic catalysts’ peroxidation activation have rarely been explored. In this study, Fe/Cu bimetallic materials were fabricated to catalyze different oxidizing agents, including peroxymonosulfate (PMS), peroxydisulfate (PDS), peroxyacetic acid (PAA), and hydrogen peroxide (H2O2), for the degradation of sulfamethoxazole (SMX). The Fe/Cu/oxidant systems exhibited an excellent degradation efficiency of sulfamethoxazole (SMX). In the Fe/Cu/PMS, Fe/Cu/PDS, and Fe/Cu/PAA systems, the main reactive oxygen species (ROS) responsible for SMX degradation were hydroxyl radical (•OH) and singlet oxygen (1O2), while the main ROS was only•OH in the H2O2system. The differences in the surface structure of the materials before and after oxidation were examined, revealing the presence of a large amount of flocculent material on the surface of the oxidized PMS material. Anion experiments and actual body experiments also revealed that the PMS system had a strong anti-interference ability. Finally, a comprehensive comparison concluded that the PMS system was the optimal system among the four oxidation systems. Overall, this work revealed that the PMS oxidant has a better catalytic degradation of SMX compared to other oxidizers for Fe/Cu, that PMS generates more ROS, and that the PMS system has a stronger resistance to interference.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shanxin Li,Yijing Sun,Fanjian Meng,Xuzhou Jiang,Hongying Yu
Effective integration of multiple functions into microwave absorbing materials is a future development direction, but still remains a significant challenge. This work fabricated a lightweight, multifunctional aerogel through electrostatic self-assembly, freeze-drying and in-situ pyrolysis process, achieving an in-situ composite of magnetic/dielectric components. The regulated pyrolysis temperature achieves a good balance between abundant nanopores and heterogeneous interfaces, enriched defects, and conductivity. This balance induced a synergy of dielectric loss, magnetic loss, and conduction loss at low frequencies, improving the impedance matching. The aerogel obtains a minimum reflection loss (RL min ) of −65.17 dB in the low-frequency range and a maximum effective absorption bandwidth (EAB max ) of 5.76 GHz. The radar cross section (RCS) simulation confirmed its good stealth performance. In addition, an increase in aerogel loading enhanced its electrical conductivity, resulting in a higher electromagnetic interference (EMI) shielding effectiveness (SE) of 81.83 dB, the specific shielding effectiveness (SSE) up to 359.28 dB·cm 3 /g and the absolute shielding effectiveness (SSE t ) up to 1596.82 dB·cm 2 /g. Beyond microwave absorption and shielding, this aerogel also exhibited good hydrophobicity and thermal insulation. This study provides a new perspective for the development of materials with microwave absorption properties in low-frequency bands and multifunctional properties for broader applications in military, communication, aerospace, and other fields.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Changchang Li,Yue Zhi,Minnan Zhu,Chengyu Yang,Yayang Tian,Tao Chen,Yuan Zhao,Jie Gao,Linfeng Chen
The development of simple, efficient and low-cost methods for rapid on-site monitoring have always been a challenging topic in the field of analysis. Here, we successfully constructed a selective, sensitive and rapid colorimetric sensor for the sensing of diethylstilbestrol (DES) by using molecular imprinting technology to construct specific recognition sites on the surface of Fe-based metal organic frameworks (Fe-MOF) peroxidase-like nanozyme. The surface of obtained sensor (Fe-MOF@MIP) had abundant channels and imprinted cavities that allowed the substrate to enter and responded with Fe-MOF core to drive the chromogenic reaction of 3,3′,5,5′-tetramethylbenzidine (TMB). When DES was present, it could specifically enter the cavities and obstruct the channels of substrate into the Fe-MOF core, thereby inhibiting the chromogenic reaction. The experimental results demonstrate that the sensor had excellent selectivity, anti-interference and catalytic stability. In the linear range of 0 – 1.67 μ M, the detection limit is as low as 8.43 nM, which is superior to peer sensors. To better adapt to in-situ analysis, we have further developed a rapid analysis method based on photo colorimetry, which performed well in real sample analysis and recovery test with the results consistent with the gas chromatograph-mass spectrometer (GC–MS), demonstrating its great potential for rapid on-site monitoring.
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Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-16
·
IF 31.6
Zhang Kaili,Yan Yuefeng,Wang Zhen,Ma Guansheng,Jia Dechang,Huang Xiaoxiao,Zhou Yu
Single-atom Fe–N 4 sites embedded into graphene were successfully synthesized to exert the dielectric properties of graphene.
The absorption mechanisms of metal-nitrogen doping reduced graphene oxide mainly include enhanced dipole polarization, interface polarization, conduction loss and defect-induced polarization.
Excellent reflection loss of − 74.05 dB (2.0 mm) and broad effective absorption bandwidth of 7.05 GHz (1.89 mm, with filler loading only 1 wt%) were obtained.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Ziyao Zhao,Kuixian Wei,Hui Wu,Ning Tan,Wenhui Ma
Fluorescent silica nanoparticles (SiNPs) have application prospects in cell imaging, optoelectronic devices, and ion detection due to their excellent optical properties, low cytotoxicity, and diverse array of surface modification methods. However, their low product yield using current preparation processes limits their further development. In this study, a high-yield one-step microwave hydrothermal synthesis method of fluorescent silica nanoparticles (SiNPs) was developed using 3-thiocyanopropyl triethoxysilane (3-TCPTES) as the silicon source and sodium citrate as the reductant. The product yield was 91.1 %, and the quantum yield (QY) was 49.1 %. In addition, the mechanism of SiNPs fluorescence quenching by different ions was analyzed, and the quenching contribution ratio of different mechanisms was estimated. The results showed that this method greatly improved the yield of SiNPs while maintaining their excellent luminescent properties and low cytotoxicity, which provides a new method for the large-scale production of high-quality SiNPs. The unique functional group structure on the surface of SiNPs realized fluorescence quenching by changing the proportion of Fe 3+ and Hg 2+ ions via static quenching, fluorescence resonance energy transfer, and aggregation-caused quenching, giving them potential applications as fluorescent probes.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Zhongyun Yang,Xiaojia Zhang,Kexin Huang,Muhammad Waqas,Xinglan Peng,Limin Wang,Xiaotian Liu,Dujuan Huang,Qiulan Huang,Du-Hong Chen,Youjun Fan,Wei Chen
Fe/N/C is recognized promising catalyst for oxygen reduction reaction (ORR), playing a pivotal role in advancing the commercialization of proton exchange membrane fuel cells. However, an inadequate ORR activity hinders its potential applications. Here, we present the preparation of M–Nx–C (M = Fe, Zn) bi-active sites for promoting ORR. By the pyrolysis of benzimidazole salts, a porous coin-like iron-zinc-based nitrogen-doped carbon materials (FeZn-NC) catalyst was synthesized with abundant active sites. X-ray photoelectron spectroscopy and transmission electron microscopy characterizations indicated the successful doping of Zn and Fe within the carbon framework. Electrochemical measurements demonstrated great positive half-wave potential (0.90 V), high limiting current density (5.15 mA·cm −2 ), excellent methanol resistance, and good stability of FeZn-NC, compared to commercial Pt/C catalysts. Furthermore, an investigation into correlation between doping content of Fe and the ORR performance was carried out. As an cathode catalyst of zinc-air battery, FeZn-NC exhibited more significant advantages, including a high open-circuit voltage (1.54 V), enhanced power density (199.89 mW·cm −2 ), good specific capacity (771.9 mAh g Zn −1 ), and enhanced stability compared to Pt/C. By presenting an approach for the controlled synthesis of metal-doped carbon materials, this work establishes the groundwork for potential applications in catalytic fields, as demonstrated by the prepared FeZn-NC.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Li,Weiguo Liu,Zhihao Han,Ndzondelelo Bingwa,Tianyu Wang,Hengdi Li,Yunpu Wang,Feiqiang Guo,Xiaoling Ma,Chenggong Sun
Microwave heating (MW) is known for its efficacy in promoting transesterification for biodiesel production. However, the microwave-induced catalysis, linked to catalyst absorbing capability, remains poorly understood. Herein, a class of alkaline catalysts with strong microwave absorption were synthesized, validating their positive impact on transesterification. Various methods were used to reveal the relationship between microwave absorbing capacity and physicochemical properties of the synthesized catalyst (KF/Mg-MIL). Results indicated the previously recognized basicity’s role for KF/Mg-MIL was surpassed by microwave absorbing capability (permittivity and permeability) in MW (2.45 GHz). KF/Mg-MIL, with ε r = 4.94′- j 1.09″ and μ r = 1.03′- j 0.024″, efficiently transformed microwave into thermal energy via the dielectric loss and magnetic loss, saving 50 % energy consumption and reducing 1051.61 kg CO 2 for per ton biodiesel compared to water bath heating (WB). Notably, “non-thermal” effect was observed with KF/Mg-MIL in MW, which reduced activation energy by 2.49 kJ/mol and increased the frequency factor by 793.32 min −1 in comparison to WB.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ming Xu,Yu Ma,Lei Wang,Shu Huang,Liming Chen,Rong Liu,Zikun Li,Guohui Yuan
Transition metal selenides (TMS) have been used to prepare hundreds of electrode materials for ion batteries due to their superior theoretical capacity, but have been repeatedly limited by the sluggish reaction kinetics and the enormous volume change during the repeated charge/discharge process. Here, we report a facile strategy to fabricate organic–inorganic composites by engineering a unique chemical bonding interface between TMS and conductive polymers. For the first time, poly(3,4-ethylenedioxythiophene) (PEDOT) is utilized to encapsulate iron diselenide (FeSe 2 ) nanoparticles by in situ polymerization, and the Fe-S bonds are meanwhile formed at the interface of FeSe 2 and PEDOT. The experimental analysis demonstrates the stability of Fe-S bonds during the sodiation/desodiation process and after long cycling, which can serve as a “bridge” for fast charge transfer and also serve as a “rivet” to stabilize the composite structure. When used for sodium ion storage, the composite offers an exceptionally long lifetime of up to 17,000 loops at 10 A/g without capacity degradation. In addition, it delivers a high specific capacity of 490.4 mAh/g and retains 60 % when the current density is amplified 150 times. The assembled full cell also exhibits excellent cycling stability. This work will provide a feasible way to improve the metal oxide/sulfide/selenides for long-life ion batteries.
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Nanomaterials
·
2024
·Vol. 14
·期 17
·1445
·
IF 4.4
Jingchao Zhang,Yingping Bu,Zhuoyan Li,Ting Yang,Naihui Zhao,Guanghui Wu,Fujing Zhao,Renchun Zhang,Daojun Zhang
Oxygen evolution reaction (OER) is a critical half-reaction in electrochemical overall water splitting and metal–air battery fields; however, the exploitation of the high activity of non-noble metal electrocatalysts to promote the intrinsic slow kinetics of OER is a vital and urgent research topic. Herein, Fe-doped Ni3S2arrays were derived from MOF precursors and directly grown on nickel foam via the traditional solvothermal way. The arrays integrated into nickel foam can be used as self-supported electrodes directly without any adhesive. Due to the synergistic effect of Fe and Ni elements in the Ni3S2structure, the optimized Fe2.3%-Ni3S2/NF electrode delivers excellent OER activity in an alkaline medium. The optimized electrode only requires a small overpotential of 233 mV to reach the current density of 10 mA cm−2, and the catalytic activity of the electrode can surpass several related electrodes reported in the literature. In addition, the long-term stability of the Fe2.3%-Ni3S2/NF electrode showed no significant attenuation after 12 h of testing at a current density of 50 mA cm−2. The introduction of Fe ions could modulate the electrical conductivity and morphology of the Ni3S2structure and thus provide a high electrochemically active area, fast reaction sites, and charge transfer rate for OER activity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yufei Feng,Shaobo Ye,Chenchen Yue,Wenhao Liu,Xuyang Lu,Qiao Liu,Qiliang Wei,Zhisheng Wu,Weiyou Yang,Qing Shi
The construction of NiFe-based composites on foam metal is an advanced strategy to design high-performance catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we chose Fe foam (FF) as the substrate, which was first modified by anodic electrodeposition to form a porous and loose FeS x / FeO x layer. This modified layer facilitates the construction of nanoflower-structured NiFeS 2 /NiFe 2 O 4 composites with large electrochemical active surface area, higher Ni content and enhanced ratio of Ni 3 + to Ni 2+ , compared with the sample fabricated by direct etching FF. The prepared NiFeS 2 /NiFe 2 O 4 /FF electrode only requires overpotentials of 242 and 273 mV to achieve current densities of 100 and 500 mA cm⁻ 2 for OER, respectively. It also possesses faster reaction kinetics with a low Tafel slope of 31.12 mV dec −1 and superior durability without potential reduction for 200 h at a large current density of 500 mA cm⁻ 2 . Meanwhile, the performance of overall water splitting cell assembled with NiFeS 2 /NiFe 2 O 4 /FF is better than that of cell based on the noble metal Pt/C/FF- |RuO 2 /FF. This work provides a simple and cost-effective strategy for constructing efficient electrocatalysts, making it promising for large-scale industrial applications in alkaline water electrolysis.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chong Xu,Yiqing Jiang,Jiahui Yang,Weimin Wu,Xing Qian,Linxi Hou
Box-structured nanomaterials with complicated surface texture, whose morphologies can be adjusted through changing mass ratios of reactants, are attractive in the field of electrochemical energy conversion. Herein, we report the shape-controllable synthesis of MoS 2 doped cobalt iron sulfide (Co-Fe-MoS x ) hollow nanoboxes with three different mass ratios of cobalt iron Prussian-blue-analog (Co-Fe PBA) nanocubes to (NH 4 ) 2 MoS 4 and their applications in dye-sensitized solar cells (DSSCs). As the increment of MoS 4 2− in system, the surface of Co-Fe-MoS x became rough with bushy embedded nanosheets. Benefiting from the three-dimensional nanostructure with more exposed edge sites and appropriate doped ratio, the Co-Fe-MoS x -2 hollow nanoboxes performed rough shells, well-defined interior voids, large specific surface areas and outstanding catalytic actives. By contrast, the sulfide of Co-Fe PBA (Co-Fe-S) and bare MoS 2 showed bad morphology and poor catalytic performance. It is notable that the DSSC with Co-Fe-MoS x -2 showed a much higher power conversion efficiency (PCE) of 9.63% than that of Pt based cell (8.23%) under AM 1.5G irradiation.
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GEOCHIMICA ET COSMOCHIMICA ACTA
·
2018
·
IF 4.69
Songhu Yuan,Xixiang Liu,Wenjuan Liao,Peng Zhang,Xiaoming Wang,Man Tong
Production of hydroxyl radicals ( OH) has been recently revealed upon oxygenation of sediments in redox-dynamic subsurface environments. In particular, Fe(II)-bearing clay minerals are the major sediment components contributing to OH production upon oxygenation, and the produced OH can oxidize contaminants and inactivate bacteria. Whereas, the mechanisms of OH production from oxygenation of Fe(II)-bearing clay minerals remain elusive. The objectives of this study were to identify the structural variation of Fe(II) entities during the oxidation of Fe(II)-bearing clay minerals by O 2 , and to unravel the mechanisms of electron transfer within the mineral structure and from mineral to O 2 for OH production. Nontronite (NAu-2, 23% Fe) which was chemically reduced to 54.5% Fe(II) in total Fe was used as a model Fe(II)-bearing clay mineral. Production of OH and oxidation of Fe(II) were measured during the oxidation of reduced NAu-2 by O 2 . A wide spectrum of spectroscopic techniques, including Fourier transform infrared spectroscopy (FTIR), Fe K-edge X-ray absorption spectroscopy (XAS), Mössbauer spectra, and X-ray photoelectron spectroscopy (XPS), were employed to explore the structural variation of Fe(II) entities in NAu-2 and the electron transfer within NAu-2 and from NAu-2 to O 2 . For 180 min oxidation of 1 g/L reduced NAu-2, a biphasic OH production was observed, being quick within the initial 15 min and slow afterwards. Production of OH correlates well with oxidation of Fe(II) in the reduced NAu-2. Within the initial 15 min, trioctahedral Fe(II)-Fe(II)-Fe(II) entities and edge Fe(II) in the reduced NAu-2 were preferentially and quickly oxidized, and electrons from the interior Fe(II)-Fe(II)-Fe(II) entities were most likely ejected from the basal siloxane plane to O 2 . Meanwhile, trioctahedral Fe(II)-Fe(II)-Fe(II) entities were mainly transformed to dioctahedral Fe(II)-Fe(II) entities. When the time of oxygenation was longer than 15 min, dioctahedral Al-Fe(II), Fe(II)-Fe(II) and Fe(II)-Fe(III) entities were slowly oxidized, and the interior electrons were transported through Fe(II)-O-Fe(III) linkages to edges and then ejected to O 2 . In the slow stage of oxidation, electrons from interior Fe(II) accumulated towards the near surface layers and fueled the regeneration of edge Fe(II) for OH production. In both stages, one-electron transfer mechanism with the involvement of O 2 − and H 2 O 2 applies for OH production from the oxidation of structural Fe(II) by O 2 . The mechanisms unraveled in this study advance the understanding of reactive oxygen species (ROS) production and structural Fe variation when Fe(II)-bearing clay minerals are oxygenated in redox-dynamic systems.
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