Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 7
·3988-3994
·
IF 7.443
Xiang Li,Fangyuan Gai,Buyuan Guan,Ye Zhang,Yunling Liu,Qisheng Huo
Fe@C core–shell particles were successfully synthesized by coating Fe2O3 particles with resorcinol–formaldehyde resins (RFs) and then calcining to make the RFs carbonize, and at the same time to reduce the core to Fe. Furthermore, we designed and synthesized Fe@C yolk–shell particles to increase the number of active sites on the Fe surface. Compared with pure Fe material, the Fe in these particles possesses a high surface area without serious aggregation. Tests to remove 4-chlorophenol suggest that both these kinds of particles can degrade chlorophenol rapidly and thoroughly based on a Fenton-like reaction. Using Fe@C yolk–shell particles, the chlorophenol can be degraded to a concentration below the HPLC detection limit (<0.5 mg l−1) within 12 minutes. The magnetic properties and good stability of Fe@C endow it with promising potential for water treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 14
·2400527
·
IF 3.4
Rongjuan Zhang,Qi Hu,Shaobo Yang,Song Yan,Yaxin Gu,Jiawei Ji,Zheng Zhou,Chaoze Liu,Xinran Li,Zihao Wang,Chengchun Tang
The arrival of the 5 G era has brought great benefits to our lives, but it has also brought problems such as electromagnetic radiation. Therefore, the demand for lightweight, high-performance microwave absorbing materials with wide effective bandwidth is increasing. Herein, MIL-53/g-C 3 N 4 is first synthesized from precursors of ferric chloride, terephthalic acid, and g-C 3 N 4 , and then thermally annealed at different temperatures to generate MOF-Fe@C nanocomposites. Heat treatment can effectively carbonize g-C 3 N 4 to amorphous carbon and reduce iron in MIL-53 to magnetic Fe and Fe 3 O 4 nanoparticles through carbon-thermal reduction reaction. The synergistic effect of dielectric loss of amorphous carbon and magnetic losses of magnetic particles enhances attenuation and improves impedance matching, enhancing microwave absorption. The RL min of MOF-Fe@C(4)-700 is as low as -72.78 dB at 9.44 GHz at a thickness of 3.18 mm and its effective absorption bandwidth is as broad as 4.88 GHz, covering most of X-band frequency range. The research introduces a novel technique for synthesizing absorbers with controllable electromagnetic characteristics by incorporating g-C 3 N 4 as carbon sources into MOF materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhaolin Xu,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Guangjun Gou
With the development of communication and automatization technology, the demand for electromagnetic absorbing materials is continuously rising. The key problem lies in expanding and regulating the electromagnetic absorption band . Among these materials, carbonized polymers stand out in terms of electromagnetic absorption due to their lightweight, low cost and designability. The carbonized polymers can bridge varies of substances to construct lightweight nitrogen-doped carbon composites, achieving broadband and tunable-band designs. In this study, Fe-C-N anchored TiO 2 hierarchical structure is simply realized by carbonizing polypyrrole/MXene precursors. FeCl 3 are designed to be as the initiator for the polymerization of pyrrole and in situ as a doping Fe source. Moreover, by controlling the carbonization temperature, the electromagnetic absorption band can be obviously regulated from C to Ku band. The multi-layered TiO 2 structure brings enhanced structural losses and better electromagnetic energy dissipation pathways, while the crystalline/amorphous interfaces and hybridizations between Fe-C-N and TiO 2 boost the interfacial polarizations and dipole polarizations. Besides, the introduction of Fe compounds leads to ferromagnetism and magnetic losses, which improves the impedance matching. This work provides referencing ways for the design of broadband electromagnetic absorbing materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Zhao Yuan,Wang Qingshuang,Yin Dongming,Wang Xiaoli,Li Shouliang,Wang Chunli,Liang Long,Zhao Shaolei,Wang Limin,Cheng Yong
α-AlH 3 is regarded as one of the most promising hydrogen storage materials due to its high hydrogen storage capacity (10.1 wt.%, 148 kg·m −3 ). However, in practical applications, the associated hydrogen release temperature remains relatively high. To effectively address this issue, hollow structured Fe@C nanorods derived from Fe-MOF are introduced as highly efficient catalyst to optimize the dehydrogenation properties of α-AlH 3 . Comparatively, the initial hydrogen release temperature of α-AlH 3 + 3 wt.% Fe@C is reduced to 94.2 °C, which is significantly lower than that of pure α-AlH 3 (137.8 °C). At 100 and 120 °C, it exhibits hydrogen capacities of 5.38 wt.% and 7.47 wt.%, respectively, whereas pure α-AlH 3 only delivers hydrogen capacities of 0.24 wt.% and 5.94 wt.% under the same temperatures. The density functional theory (DFT) calculations further indicate that the existence of Fe@C catalyst can make the length of Al–H bond increase, which is more conducive to the release of hydrogen. The results show that the synergistic effect of Fe and porous carbon in Fe@C nanorods can improve the hydrogen desorption kinetics of α-AlH 3 , providing a good prospect for the application of α-AlH 3 in hydrogen storage fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kecheng Wen,Shijin Zhang,Yanting Zhang,Xinyu Wang,Zhiwei Yang,Guozhong Zheng,Yuan Huang,Jinhui Xu,Jing Zhang
Performance enhancement of Fe-C materials for Cu 2+ removal, removal capacity, and pH range of applicability is achieved through the environmentally friendly, long-lasting magnetic fields in this study. Specifically, the utilization of the magnetic field to the Fe-C materials significantly improves the performance of Cu 2+ removal in contrast to the single Fe-C, which also brings about improvement under various water condition parameters. The concentrations of Cu 2+ , Cu + , Fe 2+ and Fe 3+ in solution were monitored, and the relevant properties of Fe-C materials were characterised. Results showed that Cu 2+ was removed by reduction of Fe-C material either in solution or after adsorption onto the surface of the material. Additionally, the magnetic field accelerated the exposure of the active sites present in the material, leading to the acceleration of adsorption of Fe-C to Cu 2+ for reduction and removal, as well as accelerating mass transfer. In addition, the magnetic field facilitated Fe-C materials' active sites and expedited the adsorption of Fe-C onto Cu 2+ for reduction and removal, as well as accelerated mass transport. Furthermore, it was verified that MF maintained a positive reinforcing impact on the Fe-C micro-electrolysis system for eliminating other heavy metal ions, with a particular emphasis on paramagnetic heavy metal ions. This research has expanded our understanding of the mechanism underlying Fe-C/MF micro-electrolysis system, and aided in the application in Fe-C/MF micro-electrolysis system for the remediation of heavy metal ions present in water environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wenjiao Chen,Hui Zhao,Binbin Xu,Qiaorong Jiang,Susu Bao,Zhiyuan Jiang
To satisfy the growing demand for military and civil applications, it is necessary to develop high-efficiency microwave-absorbing materials. Herein, a pyrolysis process was developed to construct FeO x /Fe/C composites using filter papers saturated with ferric nitrate solution as the precursor. The three-dimensional textures of filter paper are well maintained during the pyrolysis process. Ferric nitrate is decomposed to Fe 2 O 3 and subsequently reduced to Fe 3 O 4 and Fe nanoparticles embedded in the carbon matrix via carbothermal reduction. Various gases produced during the pyrolysis process create foam and generate additional nanoscale pores in the carbon matrix. The chemical composition and structure of composites can be tailored by controlling the pyrolysis conditions. The microwave absorption properties of FeO x /Fe/C composites are closely related to the chemical composition and structure. The optimized product shows excellent microwave absorption properties: The strongest reflection loss (RL) is −37 dB at ∼12 GHz; the effective absorption bandwidth (RL < −10 dB) is 6.5 GHz with a thickness of 2.0 mm. The superior absorption properties of the optimized product can be ascribed to the synergies of multiple chemical components, hierarchically porous structures and abundant interfaces. This study also suggests a large-scale synthesis strategy for high-yield carbon-coated magnetic nanoparticles for high-performance microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Zhouyu Tong,Zijian Liao,Yanyan Liu,Mingliang Ma,Yuxin Bi,Weibo Huang,Yong Ma,Mingtao Qiao,Guanglei Wu
Designing one-dimensional (1D) magnetic-carbon composites microwave absorbers is a promising strategy that can meet the current demand for high-performance microwave absorption (MA) materials. In this work, hierarchical structured Fe 3 O 4 /Fe@C@MoS 2 nanofibers were successfully obtained via a simple three-step method. 1D Fe 3 O 4 /Fe@C nanofibers were fabricated through electrospinning technology and in-situ polymerization followed by carbonization and reduction in H 2 /N 2 atmosphere. MoS 2 nanosheets grew irregularly on the surface of 1D Fe 3 O 4 /Fe@C nanofibers to form the flower-like structure. The morphology, composition and magnetism of samples were systematically investigated. Furthermore, electromagnetic characteristics and MA properties of Fe 3 O 4 /Fe@C nanofibers and Fe 3 O 4 /Fe@C@MoS 2 nanofibers were compared. The minimum reflection loss (RL min ) of Fe 3 O 4 /Fe@C@MoS 2 nanofibers could reach −53.79 dB at 11.12 GHz and the corresponding absorption bandwidth (RL < -10 dB) of 4.4 GHz was achieved at the absorber thickness of 2.24 mm. This work combines electrospinning technology with traditional chemical synthesis to prepare a novel 1D core-shell microwave absorber, which provides some inspiration for preparing MA material in the future.
研究领域:
材料科学
·
电磁学
·
化学合成
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Zhiming Deng,Yue Li,Hao-Bin Zhang,Yu Zhang,Jia-Qi Luo,Liu-Xin Liu,Zhong-Zhen Yu
Lightweight and high-performance microwave absorption materials with wide effective bandwidth are highly required due to the increasingly severe electromagnetic radiation. It is now still imperative to elaborately tune the constituents and microstructures of absorbers for improving microwave absorption capability over wide frequency ranges. Herein, sulfonated polystyrene@Fe(OH) 3 @polydopamine (SPS@Fe(OH) 3 @PDA) microspheres are firstly synthesized with ferric sulphate and dopamine as precursors of Fe(OH) 3 and amorphous carbon , and then thermally annealed at 600 °C to generate lightweight Fe@C hollow microspheres. The thermal annealing effectively decomposes SPS templates to gases, and carbonizes the PDA shell to amorphous carbon, which also reduces the ferric irons to magnetic Fe nanoparticles via the carbothermal reduction reaction. Interestingly, the microwave absorption performances of the Fe@C hollow microspheres are obviously improved by increasing the cavity sizes. The Fe@C hollow microspheres with the largest cavity of 780 nm exhibit the broadest effective absorption bandwidth of 7.5 GHz and the superior maximum reflection loss of −37.7 dB. These outstanding performances are attributed not only to the favourable synergistic effect of dielectric and magnetic losses, but also to the optimized hollow structure enhancing the attenuation capability and improving impedance matching. This work provides an efficient approach for designing and fabricating high-performance and broad-band microwave absorbers with tunable peak frequency.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Qiushi Jiang,Yanjing Li,Minmin Wang,Wen Cao,Xueying Yang,Sihu Zhang,Liejin Guo
This study investigated the mediating effect of Triethanolamine on Fe@C- Rhodobacter sphaeroides hybrid photosynthetic system to achieve efficient biohydrogen production. The biocompatible Fe@C generates excited electrons upon exposure to light, releasing ferrum for nitrogenase synthesis, and regulating the pH of the fermentation environment. Triethanolamine was introduced to optimize the electron transfer chain, thereby improving system stability, prolonging electron lifespan, and facilitating ferrum corrosion. This, in turn, stimulated the lactic acid synthetic metabolic pathway of Rhodobacter sphaeroides , resulting in increased reducing power in the biohybrid system. The ternary coupling system was analyzed through the regulation of concentration, initial pH, and light intensity. The system achieved the highest total H 2 production of 5410.9 mL/L, 1.29 times higher than the control (2360.5 mL/L). This research provides a valuable strategy for constructing ferrum-carbon-based composite-cellular biohybrid systems for photo-fermentation H 2 production.
研究领域:
微生物学
·
可再生能源
·
光合作用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Pengfei Zhu,Mengrong Geng,Shuang Qin,Heyang Cao,Zhenhong He,Xinhua Gao,Chuanyi Wang
The conversion of CO 2 into chemical products or fuels of great value always remains an outstanding challenge. Here, we report a heterojunction Fe@C/Ni 2 P composite catalyst obtained by preparing MIL-100(Fe) derived Fe@C confined Ni 2 P nanoparticles, which is applied to photothermal catalytic CO 2 hydrogenation with H 2 O. Without adding any sacrificial agents or co-catalysts, the optimal Fe@C/Ni 2 P sample shows higher yields for CO 2 -to-C 2 H 6 and CO 2 -to-CO yield of 5.83 μmol g −1 h −1 and 179.9 μmol g −1 h −1 than that of pristine Fe@C and Ni 2 P, respectively. The experimental results indicated that the obtained Fe@C/Ni 2 P can act as catalytic sites to adsorb, activate, and convert CO 2 under low-intensity LED light irradiation (420 nm) with a temperature of 200 ℃. The physical structure, photochemical properties and energy band structure of the Fe@C/Ni 2 P composite catalysts were investigated by XRD, XPS, FT-IR, TEM, BET, respectively. Furthermore, the reaction pathway of Fe@C/Ni 2 P photothermal catalytic CO 2 hydrogenation with H 2 O to C2 products and CO were systematically analyzed by in situ infrared spectroscopy (DRIFTS).
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qi Yang,Dan Chen,Libing Chu,Jianlong Wang
In present work, we studied a novel Fe/C nanomaterial fabricated using Fe-based metal organic frameworks (MOFs) as precursors through thermal pyrolysis to catalyze gamma irradiation-induced degradation of antibiotics, cephalosporin C (CEP-C) and sulfamethazine (SMT) in aqueous solution. The MOFs-derived Fe/C nanomaterials (DMOFs) had the regular octahedrons structure of MOFs and contained element C, Fe and O, while Fe° with a fraction of Fe 3 O 4 and Fe 2 O 3 were identified. Results showed that DMOFs addition could accelerate the generation of OH during gamma irradiation, while the intermediates of bonds cleavages of antibiotic molecules and OH addition were identified. DMOFs were more effective to improve the decomposition of antibiotic having the higher adsorption capacity like SMT. The degradation rate of CEP-C and SMT increased by 1.3 times and 1.8 times, and TOC reduction at 1.0 kGy reached 42 % and 51 %, respectively by gamma/DMOFs treatment, while only 20.2 % (CEP-C) and 4.5 % (SMT) of TOC reduction were obtained by γ-irradiation alone. The crystal structure, functional groups and magnetism of DMOFs changed slightly after gamma irradiation, which made it possible to be reused. DMOFs were promising to enhance the degradation of antibiotics during gamma irradiation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xiang Li,Lunzhou Yu,Zhen Xiang,Erbiao Cui,Juan Xiong,Xiao Wang,Wei Lu
Core-shell structure is an effective approach to modulate the impedance matching behaviour and induce polarization relaxation at the interface for the high-performance electromagnetic wave absorption (EMWA) materials. Herein, core-shell structures of Fe 3 O 4 –Fe@C (FFC) were successfully developed by hydrothermal and thermal decomposition methods. The results showed that the phase composition, microstructure and EMWA performance were tailored by the heat treatment process. The optimized FFC hybrid exhibited a minimum reflection loss ( RL ) value of −56.3 dB with a matching thickness of 1.99 mm, and the effective bandwidth ( RL < −10 dB, 5 GHz) covers almost the whole Ku band. The enhanced EMWA properties of the reinforced olive-like composites were mainly ascribed to the magnetic loss derived from the enhanced magnetic anisotropy, and the dielectric loss originated from the multilevel interface and polarization characteristics between the core and the shell. Therefore, this work provides an approach to design core-shell nanocomposites with enhanced EMWA performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）