JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Sulin Wang,Jian Xu,Fei Wang
Phase-resolved mass balances reveal aqueous PCE rebound during net PCE removal. • Rapid Fe(II) consumption weakens oxidation despite residual persulfate. • Fe-rich deposition and altered organic groups support changes in PCE retention. • Delayed PCE release outpaces effective oxidation, creating a kinetic mismatch. Ferrous iron-activated persulfate (Fe(II)/PDS) is widely used for in situ chemical oxidation (ISCO) of chlorinated solvents, yet aqueous rebound complicates treatment evaluation. Phase-resolved mass balances were combined with electron paramagnetic resonance (EPR) and surface characterization to examine tetrachloroethene (PCE) redistribution and removal. In homogeneous aqueous systems, PCE removal was rapid within 2 h, with rapid dissolved Fe(II) consumption. Among evaluated Fe(II):PDS ratios, 1:1 yielded the highest removal, with > 30% PDS persisting beyond the initial stage. Following Fe(II)/PDS addition to pre-equilibrated soil–water systems, aqueous PCE increased while soil-associated PCE decreased and total PCE mass declined monotonically. SEM–EDS, FTIR, and XRD indicated Fe-rich surface deposition and altered organic functional groups, supporting interfacial changes that weaken PCE retention. Soil addition attenuated EPR spin-adduct responses. In pre-equilibrated systems, the fitted sulfate-adduct response in soil extracts exhibited negligible variation between 10 and 120 min, consistent with continued soil-associated activation as intensive aqueous oxidation subsided. These observations support a kinetic mismatch between declining effective oxidative capacity and continued soil-to-water PCE release, allowing aqueous accumulation despite net removal. The findings provide a mechanistic basis for coordinating reagent transport and local activation with delayed contaminant release through alternating PDS and Fe(II) injection in groundwater circulation well (GCW) systems. Download: Download high-res image (273KB) Download: Download full-size image Mechanism of Radical‑pulse induced PCE rebound The aqueous PCE rebound observed in the investigated pre-equilibrated soil–water system is interpreted as the combined outcome of rapid initial oxidation, treatment-induced surface reconstruction, and delayed interphase mass transfer. Fe(II)/PDS activation generates an initial radical pulse involving SO 4 •− and ·OH, while dissolved Fe(II) is rapidly consumed. Reactive species can oxidize readily accessible PCE and competing soil constituents, including surface-associated organic moieties. Oxidative disturbance of SOM- and soft-carbon-associated sorption domains, together with the formation of Fe(III)-bearing surface deposits, may weaken PCE retention and reduce its immediate re-adsorption. Release from condensed SOM/hard-carbon domains and less-accessible intraparticle regions may persist as the initial aqueous oxidative activity declines. The pH evolution and relatively persistent sulfate-adduct response in soil extracts are consistent with continued soil-associated PDS activation, which may sustain slower oxidation within accessible domains. This activity, however, may not provide sufficient aqueous oxidative capacity to remove PCE at the rate of its release. Aqueous accumulation can therefore coexist with continued net PCE loss, as demonstrated by the phase-resolved mass measurements. The proposed mechanism links treatment-induced changes in contaminant retention to a kinetic mismatch between declining aqueous oxidative capacity and continued soil-to-water PCE release.
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Materials Today Chemistry
·
2026
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IF 7.4
Lican Chen,Can Dong,Tiancheng Yuan,Minzhen Bao,Xianmiao Liu,Zhikun Wang,Yanjun Li,Yu Wang
In situ decorating moso bamboo with Fe 3 O 4 nanoparticles. • The reflection loss of the prepared magnetic wood can reach −45.17 dB. • Established a radar attenuation model. The exponential proliferation of fifth-generation (5G) telecommunication networks has exacerbated electromagnetic (EM) pollution, transforming it into a formidable global challenge. Consequently, there is an imperative demand for the engineering of EM wave attenuating media that simultaneously feature low density, ecological sustainability, and exceptional absorbing proficiency. Herein, a renewable, self-supporting porous carbon composite (CB/Fe) was successfully fabricated via in-situ growth of Fe-based metal-organic frameworks (Fe-MOFs) on bamboo scaffolds followed by controlled carbonization. The unique hierarchical porous structure of bamboo, combined with uniformly distributed Fe-derived magnetic nanoparticles, enables the formation of a synergistic dielectric-magnetic loss network. Microstructural characterizations confirm that Fe nanoparticles and Fe 3 C phases are homogeneously embedded within a conductive carbon matrix, while increasing carbonization temperature significantly enhances graphitization degree and electrical conductivity. Characterized by a synergistic optimization of impedance matching and dissipation capacity, the CB/Fe-900 matrix demonstrates an extraordinary electromagnetic wave harvesting capability. Specifically, a minimum reflection loss (RL min ) of −69.37 dB is manifested at 14.64 GHz utilizing an ultra-thin thickness of merely 1.4 mm. Concurrently, this composite yields an expansive effective absorption bandwidth (EAB) spanning 4.62 GHz, highlighting its competitive edge in practical microwave shielding applications. The enhanced performance is attributed to multiple scattering within the 3D porous architecture, strong interfacial polarization at Fe-C heterojunctions, conductive loss, and magnetic resonance effects. Furthermore, the composite demonstrates excellent electrothermal conversion capability and thermal stability, highlighting its multifunctional potential.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Yundan Xiao,Yingpeng Gu,Jiajun Shi,Peng Yu,Xiaolong Guo
A synergistic dealloying and heterojunction construction strategy is developed on crystalline Ni–Fe–P ribbons. • The strong heterointerface enables efficient interfacial charge transfer and exposes abundant active sites for OER. • The electronic structure and surface reconstruction of the ribbon are modulated via LDH-induced interfacial coupling. Ni-Fe based ribbons are promising self-supporting oxygen evolution reaction (OER) electrocatalysts due to their low cost, good conductivity, and high intrinsic activity. However, pristine ribbons exhibit poor OER performance because their smooth, non-porous surface leads to limited active sites and their sluggish surface reconstruction lowers intrinsic activity. Dealloying can create nanoporous structures, but this single strategy suffers from a trade-off between mechanical integrity and active area, as well as a depth limitation of the porous layer (~500 nm). Herein, we report a synergistic strategy combining mild dealloying pretreatment with in situ growth of NiFe-LDH on Ni-Fe-P ribbons. Moderate dealloying preserves mechanical robustness while providing a nanoporous anchoring layer. Subsequent growth of NiFe layered double hydroxide (NiFe-LDH) nanosheets compensates for the limited active area, builds a deep three-dimensional catalytic network beyond the dealloying-limited depth, and forms a strong heterointerface that facilitates charge transfer. The optimized Ni-Fe-P/LDH electrode achieves a low overpotential of 245 mV at 20 mA cm −2 , substantially outperforming the pristine ribbon (353 mV) and the solely dealloyed ribbon (267 mV), and maintains stable operation for over 100 h at 10 mA cm −2 and 50 h at 500 mA cm −2 . This work demonstrates the feasibility of combining dealloying and heterojunction engineering for high-performance self-supporting OER electrocatalysts.
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Analytical Chemistry Letters
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2026
·
IF 1.6
Hongbo Zhao,Zixuan Wang,Xiaoyan Duan,Lingchun Wei,Ganghui Chu
Estradiol (E2) is a steroid hormone that has garnered widespread global attention as an emerging pollutant due to its potential to cause endocrine disruption in organisms upon concentration changes. This experiment achieves highly efficient detection of estradiol based on screen-printed electrodes (SPEs) and a graphene (GPE)/MIL-100(Fe) composite material. The GPE/MIL- 100(Fe) composite, characterized by a rich porous structure, was synthesized via a hydrothermal method, and the modified electrode was prepared using the drop-coating technique. The GPE/MIL-100(Fe) composite was characterized by SEM, XRD, FTIR, and XPS to confirm its structure, composition, and properties. Cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry (CA) were employed to enable continuous monitoring of estradiol in liquid environments. The modified electrode demonstrated significant electrocatalytic activity, exhibiting high sensitivity within a linear range of 2.0 nmol/ mL to 140 nmol/mL, with a practical detection limit (LOD) of 0.002 μmol/mL. The innovation of this study lies in leveraging the synergistic effect of GPE/MIL-100(Fe) to enhance the detection performance for estradiol. In the detection of actual samples such as urine (spiked recovery rate: 103.3% -110.9%) and pond water (spiked recovery rate: 96.7% -110.0%), clear characteristic peaks and good sensitivity for estradiol were observed.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Tao Xia,Jianxia Wang,Junfeng Chen,Xuede Li,Hong Liu,Jie Li
The efficient removal of emerging organic pollutants from water poses a significant challenge in the field of water treatment. In this study, we proposed that introducing dual metallic sites into an iron-based metal-organic framework (MOF) could synergistically enhance both adsorption capacity and photocatalytic activity. To test this hypothesis, we successfully incorporated cerium into MIL-101(Fe) via a simple one-pot hydrothermal method, synthesizing a series of Ce/Fe bimetallic MOFs. Systematic characterization results revealed that Ce doping effectively modulated the material's electronic structure, markedly enhancing visible light absorption by narrowing the bandgap from 2.81 to 2.75 eV and promoting photogenerated charge separation. The 0.1Ce/Fe-1 composite demonstrated superior chloramphenicol (CTC) adsorption, with a saturated capacity of 1551 μmol/g and rapid equilibrium attainment within 60 min. This material attained a 98.2% removal efficiency for 10 mg/L CTC within 1 h under visible light, the corresponding apparent rate constant (0.0107 min −1 ) was 26.75 times that of pristine material. Trapping experiments confirmed that •OH and •O₂⁻ radicals were the predominant active species responsible for the photocatalytic degradation. This material maintained high efficiency and stability across wide pH range, exhibited good resistance to humic acids and common ions, and demonstrated excellent removal capacity (>89.3%) and cycling stability (94.0% efficiency retained after five cycles) in actual water samples. This work demonstrates the efficacy of dual-metal-site regulation as a viable strategy to concurrently enhance both the adsorptive and photocatalytic functionalities of MOF-based materials, offering a novel pathway for developing highly efficient and stable functional materials for water treatment.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Wenting Si,Chengyu Huangfu,Xinmiao Xia,Bofei Li,Xianghai Guo
Efficient lithium extraction from aqueous media remains challenging due to the intrinsically low concentration of Li + and severe competition from coexisting ions, which places stringent requirements on the coordination environment and topology of adsorption sites in adsorbents. In this context, fluoride-mediated crystal phase engineering offers an effective route to regulate metal cluster assembly in metal–organic frameworks (MOFs). Here, this research demonstrates that fluoride incorporation regulates the phase evolution of Fe-based MOFs, promoting the formation of chain-structured TJU-21 from MIL-100(Fe)-type frameworks under appropriate synthesis conditions. This phase evolution led to significant reconstruction of the iron coordination environment, thereby increasing surface electronegativity and the density of accessible Fe F active sites. The TJU-21 exhibits a lithium adsorption capacity of 44.6 mg·g −1 , representing a 45.7% improvement compared with MIL-100(Fe). Mechanistic analysis indicates that inorganic chain-based nodes intrinsically favor Li + binding, while fluorine coordination contributes to the stabilization of open metal sites and enhanced host guest interactions. This work demonstrates that fluoride-mediated phase engineering is a promising strategy for regulating metal cluster topology and functionality in Fe-based MOFs, with potential implications for lithium extraction.
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ACS Applied Polymer Materials
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2026
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IF 5.2
Guimin Huang,Ziyi Zhao,Hongjie Zhang,Benyan Zheng,Yanxiang Sang,Rui Geng,Bibo Wang,Yuan Hu,Lijun Li,Zhonghan Liu
Infected burn wounds remain challenging to treat because bacterial contamination and oxidative stress can jointly compromise tissue repair. Herein, we report an adhesive supramolecular elastomer patch (PLCTF) constructed from a dynamic poly(α-lipoic acid) network reinforced by Fe-polyphenol coordination and hydrogen bonding. The reversible disulfide chemistry of lipoic acid contributes to network adaptability, resulting in improved mechanical performance and conformal adhesion on moist skin-like biological tissue surfaces. Under 808 nm near-infrared (NIR) irradiation, PLCTF converted the incident NIR light into localized heat, thereby further enhancing PLCTF-mediated antibacterial activity against Staphylococcus aureus and Escherichia coli under controlled irradiation conditions. In addition, the polyphenolic motifs and lipoic acid-related components provided radical-scavenging activity, as evidenced by chemical radical-scavenging assays and intracellular ROS fluorescence analysis. PLCTF also showed favorable hemocompatibility and cytocompatibility, including after short-term NIR exposure, and promoted fibroblast migration. In an S. aureus-infected burn wound model, PLCTF combined with NIR irradiation accelerated wound closure and improved histological healing outcomes, including enhanced collagen deposition and re-epithelialization. Immunofluorescence analysis revealed increased angiogenesis-associated signals and reduced inflammation-associated marker staining. These results indicate that PLCTF integrates wet-tissue adhesion, ROS-scavenging activity, and NIR-assisted antibacterial function, supporting its promise as an antibiotic-free topical dressing for superficial infected burn wounds.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Ji-Ying Song,Lei Pan,Fu-Hao Zhang,Xin-Yun Song,Qi Wu
The residues of tetracycline antibiotics (TCs) in aquatic environments have led to pressing environmental issues, necessitating the development of efficient removal technologies. In this study, we constructed an adsorption-degradation synergistic system based on Fe₃O₄ nanoparticles/graphene oxide/layered double hydroxides (Fe₃O₄/GO/LDHs) for the removal of TCs from water. This Fe₃O₄/GO/LDHs composite ingeniously combines the adsorption advantages of both GO and LDHs: GO serves as a growth substrate for LDHs, effectively preventing the LDHs from agglomerating into bulk masses, while LDHs also inhibit the interlayer stacking of GO. This leads to enhanced specific surface area of up to 581.7 m 2 /g, establishing a robust structural foundation for efficient adsorption. The incorporation of Fe₃O₄ nanoparticles not only endows the material with excellent magnetism for convenient magnetic separation and recovery but also utilizes its peroxidase-like activity to achieve catalytic degradation. The equilibrium adsorption capacities of Fe₃O₄/GO/LDHs for tetracycline, oxytetracycline, and chlortetracycline reached 676.5 mg/g, 814.1 mg/g, and 808.1 mg/g, respectively, primarily driven by electrostatic, π-π and complexation interactions. In the presence of H₂O₂, Fe₃O₄/GO/LDHs activating H₂O₂ to generate reactive oxygen species, achieving over 90% degradation rate within 1 h, demonstrating strong catalytic capability. Integrating adsorption with in-situ degradation, Fe₃O₄/GO/LDHs functions as a network of micro-reactor factories, rapidly concentrating pollutants at catalytic active sites and creating a high-local-concentration microenvironment that dramatically accelerates catalytic reactions, thereby enhancing overall degradation efficiency. This study advances the development of adsorption-degradation bifunctional nanozymes for water purification.
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ACS Catalysis
·
2026
·Vol. 16
·期 15
·15348-15362
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IF 13.6
Rhimi Baker,Harrath Karim,Liu Yifan,Liu Zheyang,Zhou Min,El-Khodary Sherif A.,Shi Weidong,Jiang Zhifeng
Photocatalytic CO 2 reduction to C 2 H 4 remains challenging due to inefficient multielectron transfer and sluggish C−C coupling kinetics. Herein, we demonstrate that precise engineering of metal−organic framework (MOF) nodes establishes dual-functional active sites that synergistically drive C−C coupling and H 2 O activation. A hybrid photocatalyst is constructed by integrating a porphyrinic MOF (Fe-MOFBPy), featuring axially coordinated bipyridine ligands that modulate paddlewheel Fe−N nodes, with carbon nitride (CN) to form a heterojunction. Controlled linker depletion introduces defects that generate coordinatively unsaturated Fe sites and enable rational tuning of Fe−N bonding. Combined density functional theory and ab initio molecular dynamics simulations reveal that the Fe−N bond acts as a dual-functional site, where the N atom facilitates H 2 O activation and proton transfer, while the Fe center promotes *CO + *CHO coupling toward C 2 intermediates. In contrast, defective MOFs with reduced Fe−N coordination form Fe−O sites that exhibit inferior activity due to inefficient H 2 O activation. Notably, the intrinsic flexibility of the Fe−N bond lowers the kinetic barrier for H 2 O dissociation. Consequently, the catalyst achieves a C 2 H 4 production rate of 24.5 μmol g −1 h −1 with an 87.1% electron-based selectivity, outperforming analogous systems. This work provides a blueprint for designing dual-functional sites in MOFs for solar-driven C 2 H 4 synthesis.
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ACS Sustainable Chemistry & Engineering
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2026
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IF 7.6
Wang Pengcheng,Wang Wei,Chen Wen,Yu Jie
The large-scale consumption and low recycling rate of plastics necessitate effective chemical recycling solutions. High-density polyethylene (HDPE) serves as an ideal carbon source for synthesizing high-value carbon materials such as carbon nanotubes. In this study, a powdered Fe/MgO catalyst was prepared to convert the HDPE into high-quality SWCNTs in a two-stage reactor. Concurrently, reactive force field molecular dynamics simulations elucidated the adsorption, cracking, and carbon diffusion behaviors of pyrolytic intermediates on the Fe surface, along with the kinetics of iron carbide formation. The results demonstrate that Fe/MgO efficiently converts HDPE into SWCNTs, achieving a maximum yield of 33.7% with 1 g of the catalyst containing 2 wt % Fe at 900 ° C. The catalyst preferentially adsorbs olefins such as ethylene, suppresses the polymerization and cyclization of small molecules, and thereby promotes SWCNT growth. The high efficiency of the Fe/MgO catalyst is attributed to a unique high-temperature inversion of its spinel structure, which triggers Fe 3+ migration from the bulk to the surface. This work not only presents a high-value route for plastic waste utilization but also provides atomic insights into SWCNT synthesis from HDPE using Fe/MgO.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Peng Wang,Ruiliang Wang,Chenyu Gao,Lianlian Wang,Qianpeng Dong,Dianming Chu,Yan He,Wenjuan Bai
During the catalytic growth of CNTs, the ordered arrangement of catalysts is critical for maintaining their array structure. Unlike mechanisms that suppress nanoparticle migration via high catalyst density to enforce CNTs array growth, this study proposes a strategy involving surface engineering and nanoparticle nucleation to construct Mo-Fe-S/Al 2 O 3 heterogeneous ternary catalysts. This method modulates the electronic density of Fe sites to activate catalytic activity while constructing Mo-Fe-S sites on the catalyst surface to catalyze the growth of a "C network" (carbon pillars and CNTs), thereby forming CNTs arrays. On one hand, S and Mo weaken the interfacial interactions between Al 2 O 3 and inactive FeO x nanoparticles, promoting active particle nucleation; on the other hand, the "C network" grown via Mo-Fe-S constitutes the top part of the CNTs arrays, confining the internal nanoparticles (NPs) to enable vertically aligned growth of CNTs. Characterizations reveal NPs with diameters of ∼20 nm and symmetrically grown CNTs arrays with average diameters and heights of 18.21 nm and 10.10μm, respectively. This work provides an approach for the catalytic growth of CNTs arrays using supported catalysts, by forming a "C network" to suppress the entanglement of NPs during the catalytic growth of CNTs, thereby forming the CNTs array structure.
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ACS Applied Energy Materials
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2025
·
IF 5.5
Wenxiang Sheng,Xiaoxing Zhou,Yuanhang Ma,Irsa Tariq,Dong Xu,Ping Chen,Peng Li
The urea oxidation reaction (UOR) presents a sustainable pathway for energy-saving hydrogen production by replacing the sluggish oxygen evolution reaction (OER) in water electrolysis. However, developing efficient and stable UOR catalysts remains challenging. NiMoO4 has emerged as a highly efficient UOR catalyst due to its synergistic intermetallic interactions and tunable electronic structure. Leveraging heteroatom doping, we engineered an Fe,P-codoped NiMoO4 nanosheet array anchored on nickel foam (Fe,P-NiMnO4/NF) with dandelion-like hierarchical architecture via a facile hydrothermal-phosphorization approach. Systematic characterization demonstrates that Fe doping creates a porous hierarchical structure, facilitating mass transport and exposing abundant active sites, while P doping simultaneously optimizes the electronic configuration and enhancing hydrophilicity, leading to an expanding electrochemical active surface area. The resulting catalyst exhibits exceptional performance, achieving a current density of 100 mA cm–2 at just 1.345 V (vs RHE) for UOR, alongside a low HER overpotential of 270 mV at the same current density. When employed in a two-electrode overall urea splitting (OUS) system, it delivers 100 mA cm–2 at a cell voltage of 1.6 V with outstanding long-term stability of 50 h. This work introduces a design strategy for high-efficiency electrocatalysts in energy-efficient hydrogen production through urea-assisted electrolysis.
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