JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xueke Li,Yan Liu,Hao Zhu,Jianmin Yang,Long Sun,Jinru Han,Zhiqiang Wang,Weidi Kong
This study focuses on the microalloying effects of iron in CuCr alloys prepared via liquid-phase sintering, with a comparative analysis of the changes in composition, microstructure, and properties before and after Fe doping. The research finds that Fe microalloying in CuCr alloys can be achieved through liquid-phase sintering coupled with copper infiltration. Fe mainly combines with Cr in solid solution or compound form and preferentially segregates at the Cu/Cr two-phase grain boundaries. The doping of Fe acts as a bridge, promoting the diffusion of Cu into the Cr phase. As a result, spherical Cu particles appear within the Cr-rich phase of the Fe-doped alloy, and the Cr-rich phase becomes progressively refined. Meanwhile, finely dispersed Cr phases are observed in the Cu-rich phase of the CuCrFe alloy, which serve as second-phase strengthening particles in the Cu matrix. Compared to the requirements of GB/T 24269–2009, the prepared CuCr47Fe3 alloy exhibits improvements in relative density, electrical conductivity, and hardness by 0.87 %, 39.5 %, and 33.3 %, respectively. These enhancements are primarily attributed to the reduction in the Cu-Cr interfacial binding energy from −33.46 eV to −33.91 eV due to Fe doping, resulting in better interfacial bonding between Cu and Cr and a more stable product system.
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Jun-Feng Lu,Huan Wang,Yi Zhou,Xue-Ying Mao,Xiao-Qian Feng,Shuang Wang,Yong-Hua Zhao
Background Rhodamine B (RhB) poses a significant threat to aquatic ecosystems. While Fenton oxidation process is promising approach for RhB degradation, the conventional Fenton reaction has the narrow pH range and poor reusability. To overcome these, this study developed Fenton-like system with Fe-Cu/HZSM-5 catalyst for effective RhB degradation. Methods A series of Fe x Cu 5-x /HZSM-5 catalysts (x represents the molar ratio of Fe to Cu) were prepared by impregnation. These catalysts were integrated with H 2 O 2 to construct Fenton-like system for the degradation of RhB. The catalysts were characterized by XRD, NH 3 -TPD, XPS, FT-IR, and N 2 adsorption-desorption at low temperature techniques. Significant findings Among the tested catalysts, Fe 3 Cu 2 /HZSM-5 exhibited optimal performance, achieving near-complete RhB degradation (∼100%) under the condition of 45 °C, 5.3 mM/L H 2 O 2 , 3.0 g/L catalyst dosage, and broad pH range (2–5). Mechanistic studies confirmed that hydroxyl radicals (·OH) were the primary oxidants responsible for RhB degradation in Fenton-like system. Under ·OH attacking, RhB underwent a series of reactions such as N-deethylation and disruption of the conjugated structure and was eventually mineralized into CO 2 and H 2 O. Overall, a novel Fe-Cu/HZSM-5 catalyst was developed to address the limitations of the traditional Fenton reaction, providing valuable insights for future research in this field.
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Sustainable Energy & Fuels
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2025
·
IF 4.1
Kexiang Li,Fancang Meng,Jiahao Li,Huan Wu,Hongbing Jia,Qingmin Ji
Polypyrrole (PPy) serves as an excellent N-rich precursor for Fe-N-C electrocatalysts, as its pyrrolic-N moieties not only facilitate metal coordination but also generate intrinsic carbon defects, promoting the formation of atomically dispersed active sites. However, excessive interchain cross-linking during polymerization often leads to dense, poorly porous carbon structures upon pyrolysis, severely limiting the accessibility of these active sites and overall catalytic performance. Herein, we report a “dynamic coordination motif” strategy by introducing 4-vinylpyridine (vP) as a co-monomer during the Fe-coordinated pyrrole polymerization. vP may compete with pyrrole for Fe coordination, forming dynamic Fe-vP complexes that act as molecular spacers within the growing polymer network. This process effectively inhibited dense chain packing, creates additional coordination anchors for Fe, and guides the formation of a more open architecture. After pyrolysis, this hybrid polymer transforms into a stable porous carbon matrix with rich pyridinic-N and a high density of accessible Fe-N sites. The resultant vP-Fe@PPy catalysts exhibited significantly superior ORR catalytic performance, outperforming both the vP-free, Fe-doped PPy-derived carbon and the commercial Pt/C catalyst. This work presents a facile and effective strategy for engineering highly accessible active sites in metal-doped carbon electrocatalysts, enabling tailorable metal loadings with uniform distribution.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wentao Qu,Zhikun Wang,Jiaqi Feng,Xupeng Li,Liqiang Yang,Li Wang,Jie Guo,Huiling Su,Miantuo Li,Yu Fu,Songqing Hu
This work presents a dual-adsorbent strategy for enhanced phosphate removal via chitosan-based materials with molecular-level mechanistic elucidation. Two complementary adsorbents are designed: spherical bimetallic beads (CSQ@Zr/Fe) and a porous hydrogel (CSQ@Zr). The CSQ@Zr/Fe beads demonstrate outstanding cyclic stability, retaining 84.2 % adsorption capacity after 5 regeneration cycles, while achieving a maximum adsorption capacity of 122.51 mg/g under optimized conditions. The CSQ@Zr hydrogel exhibits superior single-cycle performance with a capacity of 126.50 mg/g and rapid uptake kinetics, reaching adsorption equilibrium within 240 min. Both materials maintain high removal efficiency over a broad pH range (3–9) and show remarkable selectivity in complex ionic environments, with phosphate removal exceeding 90 % even in the presence of competing anions (Cl − , NO 3 − , SO 4 2− ). Comprehensive characterization and simulation studies reveal a synergistic adsorption mechanism dominated by electrostatic interactions (85–92 % contribution to binding energy), complemented by outer-sphere coordination (P–O–Zr: 2.25 Å; P–O–Fe: 1.85 Å) and hydrogen bonding networks. The hydrogel exhibits stronger phosphate confinement (diffusion coefficient: 0.544 × 10 −12 m 2 /s) compared to the beads (0.685 × 10 −12 m 2 /s), which correlates with its enhanced adsorption performance. This work provides not only high-performance adsorbents but also fundamental insights into the design of chitosan-based materials for sustainable phosphate removal and recovery applications.
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PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaohui Wang,Zhilong Cheng,Bingrong Liu,Huiyi Liu,Xin Fang,Ruiqi Chai,Lishuang Ma,Yuchao Lyu,Jianye Fu,Xinmei Liu
Methane dehydroaromatization (MDA) was a promising technology for the synthesis of high value-added aromatics through natural gas. Fe/ZSM-5 catalysts were widely used in MDA reaction. However, its catalytic mechanism remained ambiguous. In this work, a novel one-pot strategy was developed for the preparation of Fe/ZSM-5 catalysts, which can delicately control the iron species and acidic property of Fe/ZSM-5 catalysts. In-situ DRIFTS and DFT calculation demonstrated that MDA followed a bifunctional mechanism and the second C–H bond breaking process of CH 4 was the rate-determining step, where methane underwent coupling and dehydrogenation at the iron active sites to generate intermediate species (ethylene), and Brønsted acid sites played a key role in determining the selectivity of aromatics. Moreover, CO-pulse chemisorption revealed the quantitative synergistic effect between metal active sites and Brønsted acid sites. Catalysts with highly dispersed iron oxide and proper density of Brønsted acid sites exhibited the best catalytic performance. This study elucidated the catalytic roles of iron species and Brønsted acid sites in Fe/ZSM-5 catalysts in MDA and provided guidance for the future development of highly active MDA catalysts.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·504
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IF 2.8
Zheng Xiuxin,Gong Lin,Zou Zhengguang,Xie Zhuojia
In this paper, La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) were fabricated via the sol–gel (S-G) approach. The samples are all rhombohedral structure shapes and belong to the trigonal space group R-3c, as shown by XRD. ZEISS Gemini SEM 300 scans showed irregular sub-micron particles with decreasing particle size for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni). The magnetic properties were characterized utilizing an MPMS, and the magnetocaloric effects (MCE) were further investigated. The investigations of La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) found that their Curie temperatures (Tc) were 289.5 K, 290.2 K, and 300 K, respectively. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) at 5 T is 5.107 J/(kg∙K), 4.177 J/(kg∙K) and 3.852 J/(kg∙K), and the relative cooling power ( RCP ) is 264.819 J/kg, 275.3409 J/kg and 288.7435 J/kg. The Arrott curve, normalization and Curie–Weiss law (CW) fit together to determine that the second-order ferromagnetic-to-paramagnetic (FM-to-PM) transition is observed in the three samples, along with a small magnetic hysteresis and thermal hysteresis, the super-exchange interactions (SE) and the double-exchange interactions (DE) competed with each other to increase half peak width and RCP , with La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Ni) having the largest RCP . While conventional low-temperature magnetic materials need to work in a liquid helium environment, room-temperature magnetic materials do not need to rely on extreme cooling conditions, which greatly reduces the cost of refrigeration equipment, and thus room-temperature magnetically cooled materials have a greater potential for research and development. In this paper, Ni is used as the doping element, and its RCP can reach 288.7435 J/kg, and its Tc is close to room temperature, so it is possible to be used as a room-temperature magnetic cooling material.
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Data in Brief
·
2015
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IF 0
Xinghao Lin,Yanming Zhao,Youzhong Dong,Quan Kuang
This data article contains the synthesis and structure information of a new Fe-base sodium metaphosphate compound, which is related to the research article entitled ‘Synthesis, structural, magnetic and sodium deinsertion/insertion properties of a sodium ferrous metaphosphate, NaFe(PO 3 ) 3 ’ by Lin et al. [1] . The research article has reported a new Fe-base metaphosphate compound NaFe(PO 3 ) 3 , which is discovered during the exploration of the new potential electrode materials for sodium-ion batteries. In this data article, the synthesized process of this metaphosphate compound and the morphology of the obtained sample will be provided. The high-power XRD Rietveld refinement is applied to determine the crystal structure of this metaphosphate compound and the refinement result including the main refinement parameters, atomic coordinate and some important lattace parameters are stored in the cif file. Also, the refined structure has be evaluated by checkcif report and the result is also provided as the supplementary materials.
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WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 10
·2797-2810
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IF 2.43
Chen Diwei,Zheng Zhiyan,Zhang Feiji,Ke Rufu,Sun Nan,Wang Yonghao,Wang Yongjing
With increased demand for various chemical raw materials, sudden pollution incidents are more prone to occur during their transportation and usage, threatening the environment and human health. In this study, discarded tea stalks were recycled into composite materials (FSC-X00: X represents the calcination temperature) by impregnating tea stalks in Fe 2+ solution combined with subsequent calcination. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) patterns verified the existence of Fe 0 and Fe 2 O 3 , and Fe 2 O 3 was gradually reduced to Fe 0 when the calcination temperature was raised from 700 °C to 900 °C. FSC-X00 was adopted as a heterogeneous catalyst for activating H 2 O 2 to quickly degrade phenol in the water system. The degradation experiments indicated that FSC-600 exhibited superior degradation performance for phenol (20 mg/L) within 5 min and 80% total organic carbon (TOC) removal rate at pH = 3 within 30 min. The effects of the calcination temperature, the pH value and the amount of H 2 O 2 on the degradation efficiency were investigated. Competing experiments showed that fulvic acid (FA) and inorganic salts Na + had little effect on the degradation performance. The FSC-600 catalyst can be reused by thermal reduction. In addition, it was found that FSC-600 has a good degradation effect on ciprofloxacin (CIP), norfloxacin (NOR) and enrofloxacin (ENR), indicating that FSC-600 catalysts are a promising candidate for quick degradation of organic pollutants by Fenton reaction. Electron paramagnetic resonance (EPR) spectra analysis indicated that •OH is the dominant reactive oxygen species (ROS) and part 1 O 2 from O 2 also participated in the degradation. This study provides an example of creating catalysts from organic solid waste for use in emergency treatment for phenol. Fe@Fe 2 O 3 -loaded biochar (FSC-600) was prepared by waste tea stalks and FeSO 4 combined with calcinations. FSC-600-H 2 O 2 exhibited superior degradation performance for phenol, ciprofloxacin, norfloxacin and enrofloxacin in a short period. Mechanism analysis indicates that •OH is the dominant ROS and a little 1 O 2 from O 2 also participated the degradation.
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Nano Energy
·
2018
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IF 13.12
Li An,Jianrui Feng,Yu Zhang,Yong-Qing Zhao,Rui Si,Gui-Chang Wang,Fangyi Cheng,Pinxian Xi,Shouheng Sun
Transition-metal nitrides (TMNs), especially iron-based TMNs, have high electrical conductivity , superior chemical stability and unique oxygen-reaction ability, and have emerged as a new form of noble metal-free electrocatalysts . In this paper, we demonstrate that the ORR-active/OER-inert single function catalyst Fe-N can be made as the OER/ORR-active bifunctional catalyst Co-Fe-N by controlled substitution of Fe with Co. To obtain atomic insights of the Co-enhanced OER catalysis, we develop a new exfoliation method to prepare atomically thin (1.1 nm) nanosheets (NSs) of Co x Fe 1-x N 0.5 (x = 0, 0.05, 0.1, 0.15 and 0.2). Our studies show that both electronic structure and local binding environment of Fe are modified by Co substitution and the Co-Fe-N NSs show a volcano−like OER catalysis with Co 0.15 Fe 0.85 N 0.5 NSs being the most efficient OER catalyst, showing the lowest overpotential of 266 mV at 10 mA cm −2 , a Tafel slope of ∼30 mV dec −1 , and excellent stability in the 1.0 M KOH OER condition. Density functional theory (DFT) calculations suggest that the Co-Fe sites in the Co 0.15 Fe 0.85 N 0.5 structure are optimized to promote OH* to O* conversion, O*-O* coupling and O 2 formation. The Co 0.15 Fe 0.85 N 0.5 NSs are a class of new noble-metal-free catalyst for OER.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xiangyu Zi,Xiaolong Sun,Fengwei Yin,Jia Gao,Jie Huang,Yingying Zhang,Yao Chen,Yongqian Fu
MOFs represent a promising platform for enzyme immobilization, yet the development of tailored strategies to accommodate both enzyme properties and MOF structures remains a challenge. In this study, we employed chitosanase BCC1 as a model enzyme and integrated Fe 2+ /Mn 2+ ions into the ZIF-8 to construct a bimetallic MOF-based immobilization system (BCC1@Fe/Mn-ZIF-8). Comprehensive characterization by SEM, FTIR, TGA confirmed the successful immobilization and structural integrity of the composite. The immobilized enzyme retained 97 % of its initial activity and exhibited enhanced stability under harsh thermal, pH, and solvent conditions. Notably, BCC1@Fe/Mn-ZIF-8 maintained 117 % activity after 14 days at 4 °C and 72 % residual activity after 14 reuse cycles, indicating excellent storage and reusability. This bimetallic MOF-based strategy offers a robust and efficient approach for enzyme immobilization, with strong potential in industrial biocatalysis.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 237
·期 1
·9
·
IF 3
Liu Yiqing,Hu Hong,Chen Chuanzeng,Xu Linghan
Generally, Fe(II) has an efficiently catalytic activity toward peroxymonosulfate (PMS), but the slow conversion of Fe(III) to Fe(II) and production of iron sludge impede the practical application of Fe(II)/PMS system. In this work, ascorbic acid (AA), a complexing agent and reductant, was introduced to Fe(III)/PMS process to facilitate the Fe(III) reduction. The decoloration of rhodamine B (RhB) was obviously enhanced in Fe(III)/PMS process with the addition of AA. Fe(III)-AA complex was firstly generated in Fe(III)/AA/PMS process via the complexation and then was reduced to Fe(II), which could catalyze PMS to yield oxidative species. Fe(IV), sulfate radical (SO 4 •− ) and hydroxyl radical ( • OH) were the working oxidants for RhB decoloration in this system, and SO 4 •− played a major role. Increasing Fe(III), AA or PMS dosage was beneficial to RhB decoloration, but their excessive concentration would hinder RhB decoloration. The existence of HCO 3 − , SO 4 2− or FA in this system showed an inhibition effect on RhB decoloration, while a facilitation effect was obtained when the high concentration of Cl − was present. This research offers a way to improve PMS activation by Fe(III) and a technology for eliminating the refractory organic pollutants from the contaminated water.
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Royal Society Open Science
·
2025
·Vol. 12
·期 11
·
IF 2.9
Omar Mirna,Omar Sarah,El-Subruiti Gehan M.,Attia Nour F.,Eltaweil Abdelazeem
With growing concerns over water pollution and depletion of freshwater resources, finding sustainable and cost-effective solutions for water treatment is crucial. This study introduces a novel MIL-53(Fe)/Mn-doped SrTiO3 (MIL-53(Fe)/Mn-STO) direct Z-scheme photocatalyst, designed to efficiently degrade organic contaminants in water. Specifically, the photocatalytic degradation of o-nitrophenol (ONP) was investigated under an Xe lamp. The MIL-53(Fe)/Mn-STO photocatalyst demonstrated a maximum removal efficiency of 97.75% within 90 min, with a rate constant (k) of 0.0374 min−1, outperforming the individual MIL-53(Fe) and Mn-STO photocatalysts. A comprehensive analysis of the material’s properties was conducted using Fourier transform Infrared spectroscopy, energy dispersive X-ray spectroscopy, scanning electron microscopy, diffuse reflectance spectroscopy and photoluminescence techniques, and the photocatalytic activity was evaluated under various conditions, including variations in pH, ONP concentration, catalyst dosage and the presence of inorganic anions. The improved photocatalytic activity of the MIL-53(Fe)/Mn-STO system can be ascribed to the synergistic interaction between its two components, which also contributed to its excellent recyclability over five cycles. These findings demonstrate that MIL-53(Fe)/Mn-STO is a highly effective and sustainable photocatalyst with a strong potential for wastewater treatment applications.
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高影响因子
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