COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Chunmiao Liu,Yanchun Tong,Chang Liu,Jie Liu,Haibin Sun,Qiangqiang Hu,Shigang Wu,Yujun Zhao,Jiao Li,Xue Guo,Yurun Feng
In this work, novel and efficient SiBCN(Fe) nanofibers were successfully prepared by electrostatic spinning and polymer-derived ceramic (PDCs) methods, and their electromagnetic wave (EMW) absorption properties were investigated after pyrolysis at 1100–1500 °C. Notably, SiBCN(Fe) nanofibers exhibit the best EMW absorption performance after pyrolysis at 1400 °C, with a minimum reflection loss (RL min ) of −72.87 dB at 3.6 GHz and an effective absorption bandwidth (EAB, RL≤ −10 dB) of 4.34 GHz at 1.44 mm. Its excellent EMW absorption performance is attributed to its fiber structure, which facilitates the multi-level reflection and scattering of EMW. Meanwhile, the doping of Fe facilitates the in-situ generation of substances such as Fe 3 Si, which can impart SiBCN(Fe) nanofibers with magnetic loss and perfect impedance matching performance. The simulated radar cross-section (RCS) results show that the optimized SiBCN(Fe) nanofibers can effectively achieve the attenuation of EMW in a practical environment. Compared with many previously reported magnetic hybrid composites, SiBCN(Fe) nanofibers exhibit excellent electromagnetic absorption properties with a simpler preparation process, which have the potential to be used as lightweight, ultra-strong radar-absorbing materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yi Chen,Rong Qiang,Yulong Shao,Jiawen Qiu,Qian Ma,Xiao Yang,Rui Xue,Bowen Chen,Shijiang Feng,Yuancheng Ding
Magnetic metal modified carbon-based composites synthesized through chemical methods have shown great potential in the field of electromagnetic wave (EMW) absorption. Biomass-derived carbon, as an alternative to traditional carbon sources, has better economic and environmental benefits. In this work，we embedded magnetic iron ions in dried agaric through multi-effect adsorption and obtained ripple-like Fe/C composites after high-temperature annealing. The effective absorption bandwidth (EAB) of Fe/C composites can reach 6.3 GHz (11.5–17.8 GHz) at 2.5 mm, achieving broadband electromagnetic response. The excellent performance can be attributed to the ripple-like carbon, which enhances the transmission path of EMW in the absorber. On the other hand, the uniform loading of Fe nanoparticles on biomass-derived carbon promotes the interface polarization and dipole polarization and coordinates the impedance matching of the composites. This study provides a reference for the design and construction of efficient biomass-derived magnetic carbon-based absorbers.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bolong Jiang,Tianhan Zhu,Hua Song,Feng Li
The Fe-doped Ni 2 P/Fe-SBA-15 was prepared by the temperature programmed reduction method at a relative low temperature of 673 K. The effect of Fe on the catalytic performance for benzofuran (BF) hydrodeoxygenation (HDO) and dibenzothiophene (DBT) hydrodesulfurization (HDS) were investigated. The catalysts were characterized by means of X-ray diffraction (XRD), N 2 adsorption-desorption, inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of ammonia (NH 3 -TPD), and transmission electron microscope (TEM) and CO uptakes. The results indicate the incorporation of Fe into SBA-15 contributes to the exposure of smaller Ni 2 P particles (5.6 nm) with an uniform dispersion, along with enhancement of weak and medium acid strengths . Compared with Ni 2 P/SBA-15, the Fe-doped Ni 2 P/Fe-SBA-15 exhibited a much higher BF conversion of 91.7% with an improved total deoxygenated product yield of 83.3%. The excellent HDO performance of Ni 2 P/Fe-SBA-15 can be ascribed to the exposure of highly-dispersed smaller Ni 2 P particles. Meanwhile, the improved dehydration of 2-EtPh to EB and the high deoxygenated product selectivity can be attributed to the enhanced acidity. As compared to the Ni 2 P/SBA-15, the Fe-doped Ni 2 P/Fe-SBA-15 showed a higher DBT HDS activity of 96.3% with the BP formation at a great proportion of 90.3%, indicating that DBT was mainly transformed through the desulfurization pathway during HDS.
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CHEMOSPHERE
·
2017
·
IF 4.208
Shizong Wang,Jianlong Wang
Trimethoprim is a pollutant ubiquitous in the environment due to its extensive application, and it cannot be effectively removed by conventional wastewater treatment processes . In this study, the Fenton and the Fe(II)-activated persulfate processes were employed to degrade trimethoprim in an aqueous solution. The results showed that the concentration of persulfate, H 2 O 2 and Fe(II) a had significant influence on the degradation of trimethoprim in both processes. De-ionized water spiked with trimethoprim resulted in the complete degradation of trimethoprim (0.05 mM) by the mineralization of 54.9% of Fenton's reagent when the concentrations of H 2 O 2 and Fe(II) were 1 mM and 0.05 mM, respectively. In contrast, 73.4% of trimethoprim was degraded by the mineralization of 40.5% of the Fe(II)-activated persulfate process when the concentration of persulfate and Fe(II) were each 4 mM. Intermediate compounds with different m / z were detected for the Fenton and the Fe(II)-activated persulfate processes, indicating alternative degradation pathways. In the actual wastewater spiked with trimethoprim, the removal efficiency of trimethoprim decreased to 35.8% and 43.6%, respectively, for the Fenton and the Fe(II)-activated persulfate processes. In addition, the decomposition efficiencies for hydrogen peroxide and persulfate were 43.8% and 92.5%, respectively, which was lower than those in the de-ionized water system. These results demonstrated that wastewater components had a negative influence on trimethoprim degradation and the decomposition of the oxidants (persulfate and H 2 O 2 ). In summary, the Fe(II)-activated persulfate process could be used as an alternative technology for treating trimethoprim-containing wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
·
IF 3.359
Jiejie Wang,Yalei Ding,Shaoping Tong
The present study reported a novel Fe-Ag/GAC catalyst and investigated its catalytic activity for the degradation of Acid Red 73 by persulfate. The results of characterization of Fe-Ag/GAC showed that Nano-Ag was supported uniformly on GAC with high degree of crystallinity and Fe distributed mostly in the forms of noncrystalline FeO/Fe 3 O 4 or FeOOH. The presence of catalyst greatly enhanced the removal rate of AR 73, and it was found that 99% of decolorization efficiency and 84.1% of total organic carbon removal (TOC) of AR 73 could be obtained at the neutral pH within 60 min, respectively. The optimized experiments found that either higher temperature or higher dosage of Fe-Ag/GAC or Na 2 S 2 O 8 was favored for the degradation of Acid Red 73. Lowering solution pH could improve the degradation rate of AR 73. The recycling test indicated that the catalyst was relatively stable, showing a promising application.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2024
·Vol. 221
·期 12
·2300874
·
IF 1.9
Jie Yang,Zhengkun Cai,Dong Li
In this experiment, ZSM-5 molecular sieves are prepared by hydrothermal synthesis and modified by impregnation with Fe, La, and Ce loading. X-ray diffraction, X-ray photon-electron spectroscopy, and scanning electron microscopy show that Fe, La, and Ce elements are successfully loaded onto the surface of the material, and the surface area of Fe-La-Ce-ZSM-5 is 241.66 m 2 g −1 . A systematic study on the adsorption of Congo red solution is carried out using Fe-La-Ce-ZSM-5 molecular sieves and it is found through the adsorption data that the adsorption process is more in line with Langmuir and the proposed second-order kinetic model, and the theoretical saturated adsorption capacity is 2669.19 mg g −1 . The adsorption process is recycled four times and still has more than 60 % removal performance for high-concentration Congo red solution. The results of this experiment show that Fe-La-Ce-ZSM-5 molecular sieves show excellent removal performance for Congo red dye in wastewater.
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Advanced Energy Materials
·
2024
·
IF 24.4
Hongyan Zhang,Hao Zhou,Hua Wang,Yikai Wang,Xuehan Yang,Dan Wu,Pan Yuan,Maoshuai He,Wenxian Wei,Tao Yang
Water electrolysis holds the promise of transforming electric-power into hydrogen energy through a carbon free process and its widespread application highly depends on anodic oxygen evolution reaction (OER) efficiency. Transition metal-based OER catalysts meet the requirements of long-term development for cost effectiveness, and their performance can be improved by a variety of band electronic structure modulating methods. Herein, a multihybridization strategy is proposed, i.e., p-d, s-sp , and d-d hybridization are emphasized together, which guides the design of an effective vanadium (V), boron (B)-FeNiP catalyst. Density functional theory analysis reveals the existence of multihybridization and the difference between Fe and Ni in terms of hybridization strength, band configuration, and interfacial charge transfer. Specially, Fe and Ni sites are simultaneously optimized to their highest performance upon the dual B, V incorporation. As a result, the VB-FeNiP catalyst displays outstanding OER performance, regarding a Tafel slope of 57.64 mV dec −1 , an overpotential of 175 mV at 100 mA cm −2 , and exceptional stability. Here the synergistic effect of multihybridization in the design of transition metal-based catalysts is highlighted and the work in pursuit of effective way based on regulating band configuration to developing high performance OER catalysts would be evoked.
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LANGMUIR
·
2025
·
IF 3.9
Longqiang He,Xiaohua Wang,Dapeng Hong
Fe-doped BiOCl (Fe-BiOCl) hierarchical microspheres were successfully prepared by using a simple one-step solvothermal approach. The Fe-BiOCl hierarchical microspheres were analyzed by XRD, IR, SEM, XPS, TEM, etc. The analyses confirmed that impurity levels were successfully introduced into the band gap of BiOCl through Fe doping, leading to a decrease in the band gap and an expansion of the light absorption range to the visible region. Moreover, the separation and transfer of photogenerated carriers were more effectively promoted by Fe doping, resulting in a substantially elevated photocatalytic performance of BiOCl. After 40 min of dark adsorption and 60 min of photocatalysis, the removal efficiency of the prepared Fe-BiOCl-3 for methylene blue reached 93.5%, and the degradation reaction was accorded with a first-order kinetic law. After 5 cycles of photodegradation, Fe-BiOCl-3 still maintained its high photocatalytic ability, indicating that it had a certain degree of reusability. The active species capture experiment demonstrated that •O2– and •OH played a predominant role during the photocatalytic degradation process. Combined with the active species capture experiment, the photocatalytic degradation mechanism of Fe-BiOCl-3 was put forward.
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MOLECULES
·
2025
·Vol. 30
·期 11
·2331
·
IF 4.6
Ajeesh Kumar Somakumar,Ivo Romet,Agnieszka Grabias,Marcin Kruk,Shusaku Hayama,Damian Wlodarczyk,Justyna Barzowska,Yadhu Krishnan Edathumkandy,Eduard Feldbach,Puxian Xiong,Yaroslav Zhydachevskyy,Monika Trzaskowska,Hanka Przybylinska,Andrzej Suchocki
An extensive experimental study of trivalent iron (Fe3+) ions in orthorhombic lithium gallate nanocrystals was undertaken. Various spectroscopic methods, such as Raman spectroscopy, extended X-ray absorption fine structure, the Mössbauer effect, electron paramagnetic resonance, photoluminescence, thermoluminescence, and cathodoluminescence were used to investigate the synthesized phosphor. This study revealed the existence of multiple Fe3+sites, out of which the tetrahedral sites are preferentially occupied. Extensive optical studies showed that the Fe3+doped lithium gallate phosphor is a promising candidate for various luminescence and thermoluminescence-related applications in the near-infrared regime.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2011
·
IF 1.77
Jiang Xue Dong,Wei Wen,Nian Bing Li,Hong Qun Luo
In pH 2.6 HCl solution, dopamine (DA) could reduce Fe(III) to Fe(II), which further reacted with [Fe(CN) 6 ] 3− to form a Fe 3 [Fe(CN) 6 ] 2 complex. By virtue of hydrophobic force and Van der Waals force, the complex aggregated to form Fe 3 [Fe(CN) 6 ] 2 nanoparticles with the average diameter of about 20 nm. This resulted in a significant enhancement of resonance Rayleigh scattering (RRS). The maximum wavelength of the ion-association complex was located at about 350 nm. The increment of scattering intensity (Δ I RRS ) was directly proportional to the concentration of DA in the range of 0.06–1.0 μg/mL. This method has high sensitivity and the detection limit (3 σ ) for DA was 3.43 ng/mL. In this work, the characteristics of absorption and RRS spectra of this reaction have been studied. The optimum reaction condition and influencing factors have been investigated. The method was applied to the determination of DA in pharmaceutical samples with satisfactory results. Furthermore, the reaction mechanism and the reasons of RRS enhancement have been explored.
研究领域:
分析化学
·
生物医学
·
药物分析
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Carbon Neutralization
·
2022
·Vol. 1
·期 1
·49-58
·
IF 0
Xiao-Hao Liu,Wei-Hong Lai,Jian Peng,Yun Gao,Hang Zhang,Zhuo Yang,Xiang-Xi He,Zhe Hu,Li Li,Yun Qiao,Ming-Hong Wu,Hua-Kun Liu
Developing low-cost and high-voltage manganese (Mn)-based Na superionic conductor (NASICON) cathode materials have attracted extensive interest. The low capacity and cycling instability of Na 4 MnAl(PO 4 ) 3 (NMAP), however, limits its performance in sodium-ion batteries (SIBs). Herein, a binary Na 4 Mn 0.5 Fe 0.5 Al(PO 4 ) 3 (MNFAP) is fabricated to ease the structural instability and, in turn, deliver an improved reversible capacity of 102 mAh g −1 at 0.1 C and a high energy density of 287.7 Wh kg −1 . The synergistic interaction of Fe and Mn in Na 4 Mn 0.5 Fe 0.5 Al(PO 4 ) 3 /C composite leads to a one-phase solid-solution reaction mechanism with high structural reversibility. Theoretical calculations have also been performed to explain the upshifted voltage platform of both Fe 2+ /Fe 3+ and Mn 3+ /Mn 4+ redox potentials. The rational design of NASICON-type cathodes by regulating their composition with dual metal ions provides new perspectives for developing high-performance SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5946-5954
·
IF 2.1
Lu Yuting,Bian Zhenglan,Chu Fenghong,Lu Jianwei,Hou Guoqiang,Hou Shili
In this paper, a hydrothermal strategy is reported for the synthesis of nitrogen-doped carbon dots (NCD) which used citric acid (CA) and urea as reactants with different pristine molar ratios of carbon/nitrogen atoms (C/N). The fluorescence emission wavelength of the aqueous solutions of NCD can be tuned from 462 to 546 nm under a single and uniform UV light excitation (365 nm). Through many characterization analysis methods, it is demonstrated that graphitic N and C=O extended the effective conjugation length which reduced the energy gap between the highest occupied molecular orbital (HUMO) and the lowest unoccupied molecular orbital (LUMO). This is considered to be responsible for the redshift and tunability of the fluorescence emission of NCDs with different C/N molar ratios. This will be useful for designing a synthetic strategy of long-wavelength fluorescence emission carbon dots (CDs) in a non-benzene ring precursor system. As a potential fluorescence sensor, the as-prepared NCDs can specifically detect Fe 3+ ions and Al 3+ ions in aqueous solutions. Additionally, the NCDs not only are nontoxic but also exhibit large and stable fluorescence intensity, indicating that they have broad potential application in the fields of sensors and optoelectronic devices.
研究领域:
材料科学
·
分析化学
·
生物传感
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