MOLECULES
·
2025
·Vol. 30
·期 19
·4030
·
IF 4.6
Haibo Jiang,Lin Xu,Qingrun Meng,Xu Feng,Junxuan Wang,Yankai Li,Junjie Li
Introducing hierarchical structure into zeolites or synthesizing two-dimensional (2D) zeolite nanosheets have drawn much attention in catalysis and separation process due to the improvement in zeolites’ diffusion properties. In this study, Fe incorporated on the MFI zeolite framework (Fe-MFI) with the nanosheet morphology and unique hierarchical pore structure was successfully synthesized and applied for the adsorption and degradation of Rhodamine B (RhB) in a Fenton-like reaction in the presence of H2O2. The synthesis involved a seed-directed hydrothermal method in the presence of NH4F and a subsequent NaOH treatment made the synthesized hierarchical Fe-MFI nanosheets (Fe-20-10) characterized by abundant highly dispersed framework Fe3+species. As a result of these features, the Fe-20-10 showed excellent ability of adsorption and degradation efficiency of RhB, and enhanced durability due to negligible leaching of framework Fe3+species. Moreover, the hydroxyl radicals were determined as the main the reactive oxygen species of RhB degradation, and a possible adsorption–degradation pathway was proposed. This work offers guidance for developing high-performance Fenton-like degradation catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yan Huang,Bowen Zang,Chang Zhang,Mingliang Xiang,Peng Xiao,Juntao Huo,Meng Gao,Rie Umetsu,Min Ji,Bingnan Yao,Yan Zhang,Yaocen Wang,Junqiang Wang
Coating soft magnetic powders by an insulation layer is an effective way to improve the high-frequency performance of soft magnetic powder cores. The quality of insulation coating is highly dependent of the coating materials and the coating method. In the present work, a commercial amorphous powder (Fe 73 Si 11 B 11 C 3 Cr 2 ) was primarily coated by a PDA/PEI layer by a co-deposition method in alkaline solution. A thick PDA/PEI layer with good homogeneity was co-deposited on the surface of amorphous soft magnetic powders. The high frequency core loss of magnetic powder cores was reduced by up to ~ 44 % at the magnetic induction of 0.1 T and the frequency of 100 kHz by primarily coating the amorphous powders by PDA/PEI. Microscopic images showed that the PDA/PEI coating layer on the amorphous powders does not peel off while being compressed. These results indicates that PDA/PEI insulation coating is a coating method which can effectively improve the comprehensive magnetic properties of magnetic powder cores.
研究领域:
材料科学
·
磁学
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 9
·1-18
·
IF 3
Huang Xiong,Pan Yuanfeng,Cai Pingxiong
To address the prevailing issue of arsenic contamination in water bodies, a novel composite microsphere (Fe-CB) was developed for the effective removal of As(V) ions from aqueous solutions. This microsphere was prepared using a sol–gel-titration-freeze-drying method, with chitosan and ferric chloride as raw materials, polyethyleneimine as a modifier and glutaraldehyde as a cross-linking agent. The effects of pH, adsorbent dosage, initial heavy metal concentration, and contact time on the performance of the adsorbent were investigated by a series of adsorption experiments. It was showed that pH played a significant role in determining the adsorption efficiency, while temperature had a relatively minor influence. The adsorption isothermal of As(V) on Fe-CB was best described by Langmuir isotherm model, whereas the dynamic adsorption process fitted the pseudo-second-order or secondary kinetic model well. Notably, the theoretical maximum adsorption capacity was 80.97 mg/g. Furthermore, regeneration experiments demonstrated that Fe-CB maintained a regeneration rate of over 85% even after five cycles, highlighting its excellent recyclability. This study underscores the potential of Fe-CB as an efficient and reusable adsorbent for the removal of As(V) ions from contaminated waters.
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Materials
·
2021
·Vol. 14
·期 8
·1908
·
IF 3.623
Yuting Du,Yan Mo,Yong Chen
Activated carbon is widely used as an electrode material in supercapacitors due to its superior electrochemical stability, excellent electrical conductivity, and environmental friendliness. In this study, the self-discharge mechanisms of activated carbon electrodes loaded with different contents of Fe impurities (Fe and Fe3O4) were analyzed by multi-stage fitting to explore the tunability of self-discharge. It is was found that a small quantity of Fe impurities on carbon materials improves the self-discharge performance dominated by redox reaction, by adjusting the surface state and pore structure of carbon materials. As the content of Fe impurities increases, the voltage loss of activated carbon with the Fe impurity concentrations of 1.12 wt.% (AF-1.12) decreases by 37.9% of the original, which is attributable to the reduce of ohmic leakage and diffusion, and the increase in Faradic redox at the electrode/electrolyte interface. In summary, self-discharge performance of carbon-based supercapacitors can be adjusted via the surface state and pour structure, which provides insights for the future design of energy storage.Keywords:supercapacitors;self-discharge;carbon;redox reactions
研究领域:
材料科学
·
电化学
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 11
·1-9
·
IF 5.7
Deng Yan,Li Shuhuai,Ma Xionghui,Wu Yuwei,Pang Chaohai,Wang Mingyue,Li Jianping,Zhi Xu
The key to developing sensors for chiral drug determination is to exclude interference from enantiomers. In this study, metal–organic frameworks (MOFs) and molecularly imprinted polymer (MIP) were introduced to prepare a chiral sensor for levofloxacin detection. The MIP was electropolymerised on the surface of the Cu/Fe-benzene-1,3,5-tricarboxylate MOF (Cu/Fe-BTC)-modified Au electrode using levofloxacin as a template molecule. After eluting the levofloxacin, a chiral sensor with recognition sites for levofloxacin was obtained. With this site as a switch, a novel method for detecting levofloxacin was established. Because of the enhanced recognition effect, the sensor can effectively exclude the enantiomeric interference of d-ofloxacin. Moreover, Cu/Fe-BTC can effectively amplify the current response signal and improve the sensitivity of the sensor. The linear range of the sensor was 5 to 4000 × 10 −11 mol L −1 , and the detection limit was 2.07 × 10 −11 mol L −1 . When applied to detecting levofloxacin in actual samples, the sensor showed a 92.7–109.8% recovery. Graphical
研究领域:
分析化学
·
药物分析
·
材料科学
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ACS Chemical Neuroscience
·
2019
·
IF 3.861
Lu Kou,Yuemei Duan,Pengcheng Wang,Yaru Fu,Nerek Darabedian,Yonghui He,Dianlu Jiang,Dinglong Chen,Juan Xiang,Guokun Liu,Feimeng Zhou
The aberrant autoxidation of norepinephrine (NE) in the presence of oxygen, which is accelerated by Fe(III), has been linked to the pathogenesis of the Parkinson’s disease (PD). Adenosine triphosphate (ATP), as a neurotransmitter whose release can be stimulated by tissue damage and oxidative stress, is co-stored and often co-released with NE in presynaptic terminals. We have shown previously that ATP inhibits the iron-catalyzed dopamine oxidation, thereby decreasing the production of certain neurotoxins such as 6-hydroxydopamine. Whether ATP plays a similar role in Fe(III)-catalyzed NE oxidation and how it maintains the NE stability have not been investigated. Here, we studied the coordination in a ternary complex among NE, Fe(III), and ATP, and found that Fe(III) is coordinated as a octahedral center by NE and ATP. Voltammetry and mass spectrometry were employed to examine this ternary complex’s modulation of the NE autoxidation. NE–Fe(III)–ATP plays a protective role to modulate the autoxidation and Fe(III)-catalyzed oxidation of NE. The ternary complex can be detected in the substantia nigra (SN), locus coeruleus (LC), and striatum regions of C57BL/6 wild-type mice. In contrast, the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD mouse brains displayed a significant decrease of the ternary complex in the SN region and an increase in the LC and striatum areas. We posit that the ternary complex is produced by noradrenergic neurons as a protective regulator against neuronal damage and oxidative stress, contributing to the lower vulnerability of LC neurons with respect to that of SN neurons.
研究领域:
神经科学
·
医学
·
生物化学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Jie Chen,Xicheng Wang,Hua Ye,Zhenyan Yu,Longbao Feng,Jing Zhou,Yajin Che
As one of the most commonly used materials in liver tissue engineering, hydrogel has received much attention in recent years. In this work, we prepared a gelatin methacrylate (GelMA)/oxidized hyaluronic acid (OHA)/galactosylated chitosan (Gal-CS)/Fe (III)@ [email protected] 200 (TA200) hydrogel loaded with insulin-like growth factor 2 (IGF-2) for regeneration of damaged hepatocytes. Fe (III)@TA microspheres served as carrier to achieve sustained release of IGF-2 to promote hepatocytes regeneration. Galactose ligands could bind to the asialoglycoprotein receptor (ASGPR) on the surface of hepatocytes. Galactosylated chitosan could significantly increase the specific function of hepatocytes. The hydrogel we prepared had a storage modulus of 1100 Pa and was suitable for migration of hepatocytes. The release ratio of IGF-2 could reach up to 90% within 14 days. For carbon tetrachloride (CCl 4 ) induced human hepatic stellate cell line LX2 damage, GelMA/OHA/Gal-CS/TA200 hydrogel could significantly improve the survival of LX2 cells. The expression of HNF-4α and transferrin was detected in LX2 cells treated with hydrogel, indicating that the specific function of the liver was also restored. In summary, the GelMA/OHA/Gal-CS/TA200 hydrogels could be used as new tissue engineering scaffolds for the construction of artificial livers.
研究领域:
组织工程
·
肝脏再生
·
生物材料
·
细胞生物学
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MOLECULES
·
2026
·Vol. 31
·期 4
·742
·
IF 5.1
Chengwei Fan,Fuhe Le,Wuyang Xiao,Letao Zhang,Xueying Cao,Xiaoyu Dong
Developing efficient and stable electrocatalysts for the hydrogen evolution reaction (HER) is critical for advancing clean and sustainable energy technologies. Herein, a Fe-doped perovskite oxide Ba0.7Pr0.3Co0.8Fe0.2O3−δ(BPCF0.2) was successfully synthesized via the sol–gel method. By regulating the stoichiometric ratio of precursors and calcination temperature, a stable single-phase perovskite structure was achieved. X-ray photoelectron spectroscopy (XPS) analysis indicated that Fe incorporation increased the proportion of high-valent Co species and lattice oxygen content, which respectively reduced the charge transfer resistance of BPCF0.2, thereby significantly enhancing catalytic performance. Electrochemical measurements revealed that BPCF0.2exhibited remarkable HER activity in 1.0 M KOH, achieving an overpotential of 172 mV at a current density of 10 mA cm−2, with no significant decay during 200 h of continuous HER testing at 100 mA cm−2. These results demonstrate that the Fe doping strategy can effectively optimize the electronic structure, providing valuable insights for the development of perovskite-based HER catalysts.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Xuheng Liu,Ziming Cao,Zhongwei Zhao,Xingyu Chen,Jiangtao Li,Lihua He,Fenglong Sun,Wenjuan Zhang
Securing reliable supplies of rare-earth elements (REEs) increasingly depends on efficient recycling, as primary production remains geopolitically concentrated while demand from advanced technologies continues to grow. However, recycling of NdFeB waste continues to rely on conventional hydrometallurgical and pyrometallurgical processes, which are waste generating due to the intrinsic challenge of separating REEs from iron-rich phases. Here, we demonstrate a ZnCl 2 -assisted chlorination strategy that selectively converts Nd into an acid-soluble NdOCl, while stabilizing Fe as insoluble oxides (ZnFe 2 O 4 and Fe 2 O 3 ), thereby suppressing co-dissolution and facilitating efficient REEs−Fe separation. Thermodynamic analysis identifies atmosphere and temperature as critical parameters governing phase evolution. Experimental validation confirms that, under optimized conditions (air, 700 °C), REEs recoveries reach 99.31% (Nd), 93.85% (Dy), and 98.82% (Pr), while Fe dissolution is limited to 2.30%. In contrast, inert atmospheres promote Fe dissolution, and temperatures ≥800 °C induce NdFeO 3 formation, both of which compromise selective recovery. Kinetic analysis further reveals a nucleation-and-growth controlled mechanism consistent with the Avrami–Erofeev model. This route thus offers a streamlined and reagent-efficient process for REEs recovery from waste NdFeB, offering a scalable route toward closing the REEs supply loop.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Jinyu Li,Wanlin Zhou,Jiulong Wu,Baojie Li,Yuhao Zhang,Jing Zhang,Jingjing Jiang,Youcai Che,Haixin Sun,Xinyu Liu,Xupeng Qin,Shiqiang Wei,Qinghua Liu
The advancement of high-performance iron-based single-atom catalysts (Fe-SACs) for the oxygen reduction reaction (ORR) presents great promise for sustainable electrochemical energy technologies. However, the precise regulation of the spin state of the Fe center, a critical factor governing catalytic activity, remains a fundamental challenge. Here, we synthesize a sulfur-doped Fe-SAC with an asymmetric Fe–N3S1 coordination structure, which effectively modulates the local electronic environment compared with the conventional Fe–N4 configuration. Using synchrotron-based X-ray and infrared spectroscopy, we reveal that sulfur incorporation optimizes the electron occupancy of Fe 3d orbitals, including a favorable transition of the Fe spin state from low-spin to high-spin. This engineered electronic structure enhances the adsorption and activation of oxygen intermediates, substantially accelerating the kinetics of the rate-determining *OOH formation and conversion steps. Thus, the catalyst displays superior ORR performance, achieving an excellent catalytic efficiency characterized by a high half-wave potential of 0.904 V. This work provides a robust pathway for designing advanced electrocatalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 12
·35214-35222
·
IF 5.19
Zhang Hongyu,Wu Shouying,Zhang Ying,Mao Zhiping,Zhong Yi,Sui Xiaofeng,Xu Hong,Zhang Linping
Catalytic degradation is a promising and ideal technology in environmental remediation. Among them, catalytic oxidation and photocatalysis respectively based on catalysts and photocatalysts both trigger broad interests because of their high removal activity. However, the reusability of the powder catalysts still faces substantial challenges. Here, a simple strategy is proposed to load Fe-BTC catalyst on aramid fabrics (AF) to construct Fe-BTC MOF @ aramid fabric (Fe-BTC@AF) composite materials with layer-by-layer in situ self-assembly methods. The experimental results illustrated that 98% isoproturon could be removed by Fe-BTC@AF 20 with oxidant H 2 O 2 , while the single Fe-BTC@AF 20 could photo-degrade 99% isoproturon within 7 h. Meanwhile, it could sustain a high degradation rate of more than 80%, even if it had gone through 5 degradation cycles. Thus, the Fe-BTC@AF composite has a significant advantage in the recycling ability for degradation of isoproturon, which will have potential applications in the efficient removal of organic contaminants in water.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 11
·3383-3391
·
IF 2.936
Zhang Luping,Tu Xuewei,Han Weihang,Chen Liangchen,Chen Yutong,Zheng Hui
As the main resource of greenhouse gas, CO 2 needs to be fixed into different chemicals to relieve the environmental problem. Fe-based catalyst and g-C 3 N 4 have received extensive attention due to their easy preparation, low cost, and environmental friendliness. Herein, a heterogeneous catalyst system consisting of rich-electron g-C 3 N 4 and strong electron-withdrawing groups Fe-complex [Fe(bpy)(CO) 2 (Cl) 2 ] was developed, which could promote electron transfer and enhance the electronic interaction for fixing CO 2 . o -phenylenediamine substrates with different electron-donating/withdrawing groups were employed to fix CO 2 into high-valued heterocycle benzimidazoles. The optimum reaction conditions were examined by orthogonal experiments. A series of benzimidazole derivatives were synthesized with yield up to 98%, which indicated the catalyst had the ability of fixing CO 2 . This catalyst provides a new pathway for fixing CO 2 into valuable benzimidazole derivatives. Graphical Abstract
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