International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 6
·4902
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IF 4.614
Ruiqi Wu,Ning Liu,Chengna Dai,Ruinian Xu,Ning Wang,Gangqiang Yu,Biaohua Chen
N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were, respectively, loaded on the zeolite catalysts via the impregnation method. It was found that the catalytic performance of BEA was the best among the molecular sieves. Comparing the catalytic performance of Fe-BEA under different load gradients (0.25~2%), it was found that 1.5% Fe-BEA possessed the best catalytic activity. A series of characterization methods showed that Fe3+content in 1.5% Fe-BEA was the highest, and more active sites formed to promote the catalytic reaction. The α-O in the reaction eventually oxidized tert-butanol to CO2over the active site. The Co mainly existed in the form of Co2+cations over Co-BEA samples; the 2% Co-BEA possessing higher amounts of Co2+exhibited the highest activity among the prepared Co-BEA samples.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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SCRIPTA MATERIALIA
·
2024
·
IF 5.3
Mengyun Jia,Dingliang Liang,Qing Du,Hui Wang,Yuan Wu,Suihe Jiang,Xiaobin Zhang,Haihui Ruan,Xiongjun Liu,Zhaoping Lu
Magnetothermal therapy (MT) is a noninvasive cancer treatment that has shown great promise in recent years. However, the low magnetothermal efficiency of the existing magnetic nanoparticles used in MT has been an obstacle to their widespread applications. In this work, we report a new class of Fe-Co-Ni-Cu high-entropy magnetic nanoparticles (HEMNPs) with exceptional magnetothermal properties synthesized by a thermal decomposition method. The fabricated HEMNPs, having an average diameter of 60–70 nm, exhibited a saturation magnetization of 42.4 emu/g and coercivity of 129.5 Oe. The hyperthermia measurement reveals that the HEMNPs have a maximum specific loss power of 202 W/g at the concentration of 2 mg/ml under an alternating magnetic field with an intensity of 46 Oe and a frequency of 266 kHz, demonstrating the great potential for MT applications. Our results demonstrate that the high-entropy concept can be extended to develop high-performance magnetic nanoparticles for MT applications.
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Hongming Liu,Junhao Cui,Zhiyang Zhao,Yongqi Ren,Bailong Chen,Longzhi Li
The traditional utilization of lignin mainly relies on direct combustion, which leads to low energy efficiency and environmental pollution, becoming a key bottleneck restricting the efficient utilization of all components of lignocellulose. This paper introduced a new strategy of microwave-assisted lignin hydrogenolysis over bifunctional catalyst Fe-Co/AC to achieve high-value conversion of lignin. This article firstly investigated the hydrogenolysis characteristics and product distribution patterns in the presence of Fe-Co/AC through catalyst characterization and adsorption calculation, as well as hydrogenolysis experiments. The results showed that the formation of Fe-Co alloy in the catalyst resulted in highly catalytic activity and selectivity for the hydrogenolysis process. Next, the intrinsic effects of solvent hydrogen donors and microwaves on lignin hydrogenolysis were discussed, through comparative experiments of hydrogenolysis in absence of catalyst and microwave-assisted pyrolysis. Lastly, attention was paid to calculate the adsorption characteristics and bond length changes of different substrates under metal components in order to reveal the mechanism of Fe-Co for synergistic catalyzing lignin hydrogenolysis, and to propose a potential pathway for lignin directed conversion into phenol. The findings provide a new approach for efficient bond breaking and intermediates hydrogenation of solid wastes such as lignin and plastics to obtain high value-added products.
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MOLECULES
·
2025
·Vol. 31
·期 1
·
IF 4.6
Mingyu Liu,Bowen Pei,Hongyu Ba,Wei Ni,Huaheng Zhao,Shuang Chen,Jiamin Zhao,Jinsheng Zhao
The oxygen evolution reaction (OER) in water splitting involves complex multi-electron–proton transfer processes and represents the rate-determining step limiting overall electrolysis efficiency. Developing non-noble-metal catalysts with high activity and stability is therefore essential. Herein, a heterogeneous synthesis strategy was employed to in situ construct an iron-rich layered sulfate precursor (Fe0.42Co0.58-SO4/NF) on nickel foam, which underwent deep self-reconstruction in alkaline electrolyte to form nanoflower-like Fe0.42Co0.58OOH/NF. The optimized catalyst maintained its iron-rich composition and hierarchical structure, delivering outstanding OER performance with an overpotential of 220 mV at 10 mA·cm−2, a Tafel slope of 31.9 mV·dec−1, and stability exceeding 12 h at 600 mA·cm−2. Synchrotron analyses revealed dynamic transitions between mono-μ-O and di-μ-O Fe–M (M = Fe, Co) oxygen bridges during reconstruction, which enhanced both structural robustness and active-site density. The Fe-rich environment promoted the formation of Fe3+–O–Fe3+units that synergized with Co4+species to activate the lattice oxygen mechanism (LOM), thereby accelerating OER kinetics. This work elucidates the key role of oxygen-bridge geometry in optimizing catalytic activity and durability, providing valuable insights into the rational design of Fe–Co-based non-noble-metal catalysts with high iron content for efficient water oxidation.
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Journal of Environmental Sciences
·
2026
·
IF 6.5
Mingjun Xie,Yuying Han,Congting Sun,Shuyan Zang
Heterogeneous activation of peracetic acid (PAA) is promising for advanced water purification but still suffers from nonselective radical production, matrix interference, and inefficient electron transfer at poorly defined sites. Here, we design an asymmetric Fe–Co dual-atom catalyst (FeCo-DAC) anchored on N-doped porous carbon, effectively steering PAA activation toward a surface-confined, electron-transfer-dominated pathway. FeCo-DAC/PAA exhibits rapid bisphenol A (BPA) degradation ( k obs =1.90 min −1 ), surpassing single-metal counterparts (Fe-SAC 1.61 min −1 ; Co-SAC 0.41 min −1 ). EPR reveal O₂•⁻dominated and ¹O₂ dominated pathways on Fe‑SAC and Co‑SAC, respectively, while FeCo‑DAC indicating an interfacial electron‑transfer‑dominated mechanism. Mechanistic analyses reveal that electronically asymmetric Fe–N 4 and Co–N₃ sites cooperatively polarize adsorbed PAA to form a high-potential intermediate, enabling direct electron transfer from BPA within a closed interfacial loop with minimal radical release. The FeCo-DAC/PAA system efficiently degrades diverse micropollutants (BPA, BPS, BPC ≈ 100 %; RhB, SMX ≥96 %) and achieves robust TOC removal (52 %-63 %) in complex real-water matrices with low metal leaching (Fe²⁺ ≈ 78.4 μg/L; Co²⁺ ≈ 189.5 μg/L). Additionally, embedding FeCo-DAC into a PVDF membrane yields continuous-flow BPA removal (95 %-100 %) over 600 min, underscoring the practical potential of this asymmetric dual-site catalyst for sustainable, selective water purification.
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iScience
·
2026
·
IF 4.5
Zhen Zhang,Chenghui Luo,Mingxin Qin,Qvqv Jing,Lei Hao,Xinhua Xu
Fe-based single-atom catalysts (Fe-SACs) are able to enhance the Peroxymonosulfate (PMS) activation effectively just as a result of metal active sites that are precisely defined and atomically dispersed. The Fe 2 Co 1 CN catalyst synthesized in this work exhibits excellent catalytic activity toward PMS activation: the Fe 2 Co 1 CN/PMS system achieved nearly 100% 2-chlorophenol (2-CP) removal, a sharp contrast to only ∼1.5% removal by PMS alone. Corresponding, a mineralization rate of 78.3% was attained within 2 hours, coupled with extremely low metal leaching concentrations — evidencing the Fe 2 Co 1 CN catalyst’s superior structural stability and high catalytic efficiency in PMS activation. Together with its non-radical PMS activation mechanism, these merits highlight the catalyst’s potential as an efficient, stable, and selective candidate for practical wastewater treatment applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·53355-53369
·
IF 5.8
Ding Chunsheng,Lei Jia,Cai Zhiyue,Gao Mengying,Zou Zhaozheng,Li Yuanfeng,Deng Jing
In this research, FeCo 2 O 4 nanomaterial was successfully synthesized by a typical sol–gel method and conducted as an effective agent for peroxymonosulfate (PMS) activation to eliminate antibiotics flurbiprofen (FLU), a strong nonsteroidal drug. FeCo 2 O 4 nanomaterial was characterized by XRD, TEM, SEM, and XPS. Various characterization results proved that FeCo 2 O 4 held stable spinel structure. The interfering factors including initial pH, PMS concentration, catalyst dosage, inorganic anions, and humic acid on FLU removal were also discussed. The conclusion was that the removal efficiency of FLU reached 98.2% within 120 min after adding FeCo 2 O 4 (0.4 g L −1 ) and PMS (3 mM). The optimal pH for FLU degradation was the initial pH of 6.5; too acidic or alkaline was not conductive to the degradation. The existence of HA and Cl − restrained the degradation of FLU, and HCO 3 − promoted the removal, while the influence of NO 3 − and SO 4 2− could not be considered. The radical scavenging experiment confirmed that • OH, O 2 •− , and SO 4 •− participated in FLU removal and SO 4 •− functioned a leading role. FeCo 2 O 4 showed high efficiency for PMS activation in pH range of 3.0 to 10.0. After the fourth cycle operation, the FLU removal rate exceeded 76.9%, and the Co leaching rate was low during the catalytic reaction. This study shows that FeCo 2 O 4 nanomaterial is an efficient and environment-friendly catalyst, which can be applied for PMS activation to remove organic pollutants in water.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Mingyao Yang,Yanwei Li,Jinhuan Yao,Jiqiong Jiang,Xuejiao Chen,Wenhan Xu
Prussian blue (PB) and its analogs (PBAs) have become a research hotspot in the fields of electrochemical energy storage and electrochromism due to their good reversible redox activity, and reversible color change response in different redox states. Herein, a series of trimetallic PBAs (Co/NiHCF with Co to Ni molar ratios of 1:0, 3:1, 1:1, 1:3, and 0:1) are synthesized by a facile co-precipitation method. In particular, the impact of Co to Ni molar ratio on the lithium storage and electrochromic properties of Co/NiHCF materials are systemically investigated. All five samples possess good crystallinity but the particle size decreases with the reduction of Co/Ni molar ratio. The color change, redox reaction potential, and lithium storage activity of the samples can be readily controlled by adjusting the molar ratio of Co to Ni. The lithium storage activity of the samples strengthens with the increase of Ni content in Co/NiHCF, accompanied by a decrease in redox potentials. With the increase of Ni content, the color of the Co/NiHCF film in the oxidation state changes from purple-red to orange, and finally to yellow; in the reduction state, the color of the film changes from green to light green and then to colorless. All the samples exhibit superior rate capability, excellent cycling stability, and short switching time (in the range of 1.6 to 4.3 s). The present work demonstrates a facile strategy for readily tunning the lithium storage activity, redox reaction potentials, and realizing rich color changes of PBA-based bifunctional materials.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kang Li,Chenxi Li,Yisa Liu,Jiong Dong,Lili Xu,Yanran Li,Ruixin Ma,Shina Li
The widespread application of nuclear energy has increased the risk of contamination by radionuclide 137 Cs. Prussian blue analogues are considered to be excellent materials for the removal of 137 Cs from wastewater due to their unique structure. In this work, Cs + adsorbent for PBAs with Fe-Co framework, potassium iron hexacyanocobaltate (PBA Fe ), was synthesized by room temperature precipitation method. Systematic structural characterization and performance results of PBA Fe showed that it has a specific surface area of 452.8 m 2 /g and an average pore size of 8.6 nm, providing more active sites for Cs + . The adsorption of Cs + on PBA Fe exhibited fast reaction kinetics (within 10 min) and high adsorption capacity (82.90 mg/g), and the removal rate of Cs + reached 98.57 %. The efficient removal of Cs + by PBA Fe in various real water environments showed its excellent selectivity and potential for practical application. In addition, adsorption mechanism studies showed that the adsorption of Cs + was achieved by ion exchange with K + in the PBA Fe lattice. PBA Fe has the advantages of simple synthesis and good selectivity, and has potential application in the harmless treatment of Cs + in radioactive wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yurong Ren,Xiaofang Lai,Minhao Guo,Ruiqi Wang,Jun Deng,Jikang Jian
Three layered quaternary sulfides, NaLi M S 2 ( M = Mn, Fe, Co) were synthesized by solid-state reactions. They adopt a trigonal CaAl 2 Si 2 -type structure (S.G. P -3 m 1) with Li and M randomly distributed at the tetrahedral metal site. Magnetic measurements reveal spin-glass ground states for these compounds, in contrast to the long-range antiferromagnetic order in the ternary counterpart NaFe 1.6 S 2 . As evidenced by electrical resistivity and optical measurements , all these three compounds show semiconducting nature, consistent with the results of first-principles calculations. The measured band gaps are 3.4 eV and 1.25 eV for NaLiMnS 2 and NaLiCoS 2 , respectively. Photoelectric measurements on NaLiCoS 2 demonstrate its potential application in photovoltaic devices .
研究领域:
材料科学
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固体化学
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凝聚态物理
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无机化学
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功能材料
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Energy Technology
·
2020
·Vol. 8
·期 5
·2000008
·
IF 3.404
Chengrui Wang,Lei Zhang,Yuhai Dou,Luke Hencz,Lixue Jiang,Mohammad Al-Mamun,Porun Liu,Shanqing Zhang,Dan Wang,Huijun Zhao
Further commercial application of low-cost NiO-based anodes is hindered by their large volume expansion after full lithiation and relatively poor theoretical capacity. To improve these issues, transition metal (Fe, Co, or Mn)-modified triple-shelled NiO microspheres (TS-NiO) are successfully synthesized by using a hard template double-adsorption method. Among them, the Fe-modified TS-NiO (TS-NFO) exhibits an extraordinary lithium storage ability with high reversible capacity and outstanding cycling stability (2061.1 mAh g −1 after 800 cycles at 0.5 A g −1 ), which is the highest performing nickel oxide-based anode reported to date. The outstanding electrochemical performance of TS-NFO can be ascribed to its unique triple-shelled structure. The inner core of TS-NFO is composed of NiO and is encapsulated by two outer shells which are composed of a mixture of α-Fe 2 O 3 and NiFe 2 O 4 , resulting in a unique hollow triple-shelled structure (NiO@α-Fe 2 O 3 /NiFe 2 O 4 ). The void space between the triple shells leaves room for their volume changes during lithiation/delithiation, which improves the cycling stability. In addition, the introduced α-Fe 2 O 3 /NiFe 2 O 4 outer shells increase the energy density and reversible capacity due to a synergistically interactive effect.
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