ELECTROCHIMICA ACTA
·
2025
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IF 5.6
Hao Guo,Dinghao Zheng,Zhenjie Hao,Yuze Wang,Ruiqi Huang,Yaohong Huang,Ruixia Zhong,Liang Dong,Rui Zhu,Jianbing Zang,Pengfei Li,Jinsheng Li
The development of sustainable energy technologies depends critically on the search for effective, reasonably priced catalysts for the oxygen reduction reaction (ORR) and high-capacitance supercapacitors. This study introduces a novel iron and zinc co-doped porous carbon nanofiber catalyst (Fe/Zn-N-C-900), fabricated through an innovative electrospinning technique, which is mainly improved by adding β-cyclodextrin (β-CD) and zinc chloride (ZnCl 2 ) to the spinning solution. The β-CD can reduce the nanofiber diameter, together with zinc chloride, creates a rich hierarchical pore structure. With an onset potential of 0.97 V in alkaline and 0.79 V in acidic media, the resultant Fe/Zn-N-C-900 catalyst exhibits remarkable ORR activity and an impressive specific surface area of 1075.39 m 2 ·g -1 . With an energy density of 38.34 Wh·kg -1 , it maintains 98 % of its capacitance after 5000 charge-discharge cycles and reaches a specific capacitance of 332 F·g -1 at 1 A·g -1 in supercapacitor tests. The exceptional performance is attributed to the high surface area, hierarchical porous structure, and synergistic effects of iron and zinc co-doping, according to combined characterization and density functional theory calculations.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Mingjun Xie,Yuying Han,Na Wang,Zixuan Huang,Congting Sun
The efficient elimination of recalcitrant synthetic dyes from complex waters remains a pressing challenge for advanced oxidation processes (AOPs). Herein, an Fe-MOFs-derives@BC composite was fabricated by anchoring MIL-101(Fe) crystals onto rice-straw biochar followed by high-temperature carbonization. XRD, SEM and XPS confirm the formation of a crystal–amorphous hybrid in which residual MIL-101(Fe) nanocrystallites are embedded within a conductive carbon matrix rich in oxygen vacancies. The composite rapidly activates PMS via a synergistic Fe(II)/Fe(III) redox cycle and carbon-facilitated electron transfer, generating SO₄• − , •OH, and 1 O₂ to driving Rhodamine B (RhB) and Malachite Green (MG) degradation. Under optimal conditions (0.1 g L −1 catalyst, 0.1 g L −1 PMS), >90% RhB and MG were removed within 15 min across deionised, groundwater, lake and river matrices; even in the most complex river water, 90% removal is achieved in 10 min. When Fe-MOFs-derives@BC is immobilised in a poly (vinylidene fluoride) membrane, a continuous-flow micro-reactor maintains >90% removal over 600 min with negligible flux decline and undetectable Fe leaching. This hybrid radical/non-radical pathway, broad matrix tolerance and long-term membrane stability position Fe MOFs-derives@BC/PMS as a robust, scalable platform for advanced wastewater treatment.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Mei Dong,Qiguang Cao,Song Li,Kebin Li
Designing stable and efficient heterogeneous catalysts for peroxymonosulfate (PMS) activation remains a critical challenge in advanced oxidation processes. Herein, we prepared a polyvinylpyrrolidone (PVP)-modified MIL-101(Fe)@CoZn-ZIF (PVP-MCZ) core-shell nanocomposite that synergistically combined enhanced catalytic activity with exceptional stability. The PVP-MCZ catalyst achieved complete degradation of 4-nitrophenol (4-NP) (20 mg/L) within 15 min, while suppressing metal leaching (<0.5 mg/L). Comprehensive characterization (XPS, EPR) revealed a dual-pathway mechanism: (i) radical-dominated SO 4 − generation via Co 2+ /Co 3+ and Fe 2+ /Fe 3+ redox cycling, and (ii) non-radical 1 O 2 production from PMS self-decomposition. This work provides a scalable strategy to design MOF-based catalysts for sustainable water remediation.
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ACS ES&T Water
·
2025
·
IF 4.3
Ting Li,Xiqing Wang,Xin Du,Murong Wang,Jianru Liang,Lixiang Zhou
The widespread application of Fe-based heterogeneous Fenton in water treatment is hindered by two main challenges: the inefficiency of the Fe(III)/Fe(II) redox cycle and the requirement of acidic conditions. In this study, combining schwertmannite with iron phosphide (Sch/FeP) via pre-adding FeP in the formation process of Sch could enhance the Fe(II)/Fe(III) conversion and self-producing acidic environment by SO42– substitution. Specifically, the inclusion of FeP in the Sch/FeP composite markedly increased the content of ≡Fe(II) species, thereby improving the activation of H2O2 to produce substantial quantities of •OH and •O2– radicals. Sch/FeP-driven heterogeneous Fenton exhibited high total organic carbon (TOC) removal (∼60%) and utilization efficiency of H2O2 (100%) after 20 min. Furthermore, Sch/FeP exhibited excellent degradation performance across a broad pH range (2–10), which could be attributed to the SO42– substitution reaction. This study not only addresses critical challenges in heterogeneous Fenton processes but also provides a novel strategy for modifying sulfate minerals to enhance their environmental applicability.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Yanjia Zhou,Xiao-Dong Tang,Jingjing Li,Da-Yong Qing,Hong Wang
MIL-101(Cr) and MIL-100(Fe) are both representative MIL-type Metal-Organic-Frameworks (MOFs) materials, renowned for their large specific surface areas and size-tunable characteristics, making them suitable candidates for Li+ extraction from lithium-containing solvent. By introducing -NH2 functional groups and using LiNO3 as both a template and mineralizer, the functionalized MOF materials Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) were synthesized. Following modification, their Li+ adsorption capacities were increased, reaching 43.58 and 38.22 mg/g, respectively. The dosage of mineralizer, initial Li+ concentration, adsorbent dosage, solution pH value, and temperature all have an impact on the adsorption capacity of adsorbents. In addition, through the establishment of the pseudo-first-order kinetic model, pseudo-second-order kinetic model, as well as Langmuir and Freundlich thermodynamic models, it can be known that the adsorption of the materials belonged to monolayer chemisorption, and the adsorption process was exothermic. Furthermore, both adsorbents showed good reusability, retaining over 85% of their initial adsorption capacity after four adsorption-desorption cycles, highlighting their practical applicability in lithium recovery processes. In Mg-Li mixed solution systems, both materials exhibited exceptional Li+ selectivity. At a low Mg2+/Li+ ratio of 3, the separation factor (α) exceeded 80; even at a high Mg2+/Li+ ratio of 10, α remained near 50. Additionally, in systems with coexistence of multiple interfering ions, the distribution coefficient (Kd) followed the order: Li+ ≫ Mg2+ > Ca2+ > Na+ > K+. In the mixed systems, Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) exhibited certain separation effect for Li+ against competing cations.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
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IF 21.1
Zhimo Fang,Yuan Liang,Zepeng Zeng,Haotian Bai,Zhou Zhou,Lin Zhang,Bin Hu,Shiguan Yang,Jihong Li,Qiang Lu
Herein, we synthesized well-dispersed N and Fe-doped CoS 2 (FNCS) with stable sulfur vacancies (S V ) for Fenton-like reaction. The characterization, experimental, and calculation results jointly unveiled the synergistic modification of heteroatoms and defects within FNCS constructed unique Co−N−Fe···S V sites, enabling synchronous activation of peroxymonosulfate (PMS) and dissolved oxygen (DO). Optimized S 3p-Co 3d orbital hybridization facilitated efficient electron cycling, generating both SO 4 •− radicals and singlet oxygen ( 1 O 2 ) at Co−N−Fe···S V sites. Consequently, the FNCS/PMS system, operating via a radical-nonradical synergistic mechanism, achieved an ultra-high pollutant degradation rate constant of 2.71 min⁻¹ , 3.77 times higher than radical-dominated CoS 2 /PMS, while retaining over 90 % of its initial activity after 10 h of operation with strong interference resistance. This work provides a clear perspective on regulating the electronic structure of active sites to synergistically activate multiple oxidants for enhanced Fenton-like catalysis.
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ACS ES&T Engineering
·
2025
·
IF 6.7
Xiaoyu Teng,Peng Zhang,Songhu Yuan
Air sparging (AS) normally removes volatile chlorinated solvents in aquifers by stripping. Here, we found that oxygen (O2) supplied by AS could be transformed to hydroxyl radicals (•OH) by aquifer Fe(II) and led to a significant degradation of contaminants. In a simulated two-dimensional (2D) sand-filling aquifer contaminated with 22 μM trichloroethylene (TCE), long-term groundwater circulation subsequent to short-term AS was applied to facilitate the dissolving and mass transport of O2, and dissolved Fe(II) in the form of TPP–Fe(II) complex was added as the source of Fe(II). With the addition of 1.6 mM TPP–Fe(II), TCE removal increased from 52.9 to 89.0% with the increase in air flow rate from 20 to 120 L/h, and degradation contributed to over 89% of the total removals. TCE degradation also increased significantly with the increase in TPP–Fe(II) concentration. Degradation played a much more significant role than stripping for TCE removal in the sequential process. Temporal and spatial distributions of dissolved O2, dissolved Fe(II), and TCE corroborated the predominant contribution of the O2–Fe(II) interaction for TCE degradation due to •OH production. This study demonstrates the important role of oxidation in air sparging and provides a new strategy for applying O2–Fe(II)-driven oxidation by O2 in aquifer treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Chuanqi Feng,Lumin Wang,Dashuai Zhang,Longlong Geng,Lianwen Zhou,Ling Wang,Guanfeng Tian,Qi Tang,Jinyan Hu,Bijiang Geng,Lang Yan
The efficacy of electron-hole separation in a single sonosensitizer and the complexities of the tumor microenvironment (TME) present significant challenges to the effectiveness of sonodynamic therapy (SDT). Designing efficient sonosensitizers to enhance electron-hole separation and alleviate TME resistance is crucial yet challenging. Herein, we introduce a novel Z-scheme heterojunctions (HJs) sonosensitizer using Fe-doped carbon dots (CDs) as auxiliary semiconductors to sensitize cubic Cu 2 O (Fe-CDs@Cu 2 O) for the first time. Fe-CDs@Cu 2 O demonstrated enhanced SDT effects due to improved electron-hole separation. Additionally, the introduction of Fe ions in CDs synergistically enhances Fenton-like reactions with Cu ions in Cu 2 O, resulting in enhanced chemodynamic therapy (CDT) effects. Moreover, Fe-CDs@Cu 2 O exhibited rapid glutathione (GSH) depletion, effectively mitigating TME resistance. With high rates of 1 O 2 and OH generated by Fe-CDs@Cu 2 O, coupled with strong GSH depletion, single drug injection and ultrasound (US) irradiation effectively eliminate tumors. This innovative heterojunction sonosensitizer offers a promising pathway for clinical anti-tumor treatment.
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Science China-Technological Sciences
·
2025
·Vol. 68
·期 8
·1-11
·
IF 4.9
Yang Ping-an,Zhao Chensong,Luo Jiufei,Zou Lihua,Liu Zhongbang,Gui Yingang,Zhou Zhihao
This study develops a flexible strain sensor with electromagnetic interference (EMI) shielding, hydrophobicity, and acid/alkali resistance by integrating a bi-ordered porous structure with a micro-raised surface. The structure, mimicking lotus leaves, is fabricated using magnetic field-assisted freezing orientation and laser ablation on graphene (Gr)/Fe nanowire (NW)-infused aerogel and polydimethylsiloxane. The sensor, with a Gr to Fe NW ratio of 9:1, shows a high gauge factor of 85.19 in the 0–30% tensile strain. These values are 304%, 430%, 702%, and 1226% of the samples with Gr to Fe NWs ratios of 7:1, 5:1, 3:1, and 1:1, respectively. It achieves an EMI shielding efficiency (SE) of 20.02 dB and a specific SE of 807.48 dB cm 2 /g in the 8.2–12.4 GHz range, 150% higher than isotropic samples. The sensor exhibits a contact angle of 155.76°, maintaining hydrophobic stability under stretching and showing excellent resistance to acid and alkali. Additionally, the sensor can be integrated into wearable devices like gloves for gesture recognition, machine hand manipulation, and controlling neon bulbs, demonstrating potential for applications in field robotics and human-robot interaction.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaotong Fu,Meili Ding,Yang Wang,Jiani Chen,Jianfeng Yao
Highly efficient carbon dioxide (CO2) conversion over novel photothermal catalysts featuring a wide light absorption range to meet the energy and chemical demands is an urgent challenge. To this end, an etching-coordination strategy is designed to synthesize novel metal–organic framework/metal–tannic acid (TA) composites for photodriven CO2 cycloaddition. ZIF-8 can be partially removed by TA to yield a yolk–shell structure, facilitating multiple reflections of light and thereby improving light utilization and photothermal conversion. With the aid of coordination between the Fe3+ and –OH groups, the formation of Fe–TA networks on the surface of ZIF-8 significantly enhances its photoresponsive range. Notably, under full-spectrum illumination of 550 mW cm−2 for 10 h, ZIF-8/Fe–TA-10 achieves a catalytic yield of 96.3% with >99.9% selectivity for the coupling of CO2 and epichlorohydrin. Furthermore, the calculation results suggest that CO2 cycloaddition can be accelerated with a significantly reduced activation energy (19.4 kJ mol−1) in the presence of ZIF-8/Fe–TA-10. On the basis of the experimental results, a cooperative reaction mechanism coupling photothermal catalysis and photocatalysis is proposed. This work provides an available strategy for the future synthesis of MOF-based photocatalysts for catalytic and other applications.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Li Zhang,Youwen Li,Yuying Feng,Jiahui Jiang,Ting Zhao,Guancheng Xu
A trimetallic selenide electrocatalyst (Co, Fe, Ni)Se2 supported on nickel foam (NF) has been successfully synthesized for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The catalyst was fabricated through a two-step strategy involving the formation of metal-organic frameworks (MOFs) precursors followed by a selenization reaction. The optimized (Co, Fe, Ni)Se2/NF-3:1 exhibited remarkable OER activity with an overpotential as low as 170 mV to achieve 10 mA cm-2, along with excellent stability over 1000 cycles. Its superior UOR performance with even lower overpotential further demonstrates promise for urea-assisted energy-saving hydrogen production. The enhanced electrocatalytic performance originates from the synergistic electronic modulation between Co, Fe, and Ni, the rough surface morphology facilitating mass and charge transport, and the highly conductive NF substrate enabling efficient exposure of active sites. This work provides valuable insights into the design of efficient multimetallic selenide electrocatalysts for sustainable electrochemical energy conversion.
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Analytical Methods
·
2025
·
IF 2.6
Qian Wang,Xiaoyun Li,Haiyan Zhang,Heng Wei,Jin Han,Guangzhou Xu,Jianlei Chao,Kun Wang,Tao Jiang
In this work, a novel sensitive colorimetric sensor was constructed for the determination of Iron (II) (Fe 2+) via by modifying 3,3',5,5'-tetramethylbenzidine and 3-mercaptopropionic acid on the surface of silver nanoparticles. In the presence of Fe 2+ , the modifying groups interacted with Fe 2+, which caused the color of the solution changed, and the absorption peak at 395 nm decreased, while a new absorption peak appeared at 525 nm. This method exhibited good selectivity and sensitivity for the determination of Fe 2+ by observing the color of the system with the naked eye and calculating the ratio of A525 and A404, the linear range was from 0.5×10 -6 M to 1.00×10 -5 M and the limit of visual colorimetric detection was 500 nM. This method has great potential for the rapid detection of iron(II) in environmental samples, including successful applications in tap water and lake water analysis.
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