IONICS
·
2025
·
IF 2.6
Yong Daming,Kang Xiaomeng,Yin Ming,Wu Qichao
First, a spherical Fe 3 O 4 was synthesized using the hydrothermal method, and subsequently coated with carbon to form a core–shell C/Fe 3 O 4 composite. The Fe 3 O 4 core was then dissolved in an etching solution to create a hollow carbon (H-C) structure. This H-C served as a substrate onto which a Fe 3 O 4 layer was deposited via the hydrothermal method, resulting in a hollow core–shell Fe 3 O 4 /C composite. Finally, the solvothermal method was employed to coat the Fe 3 O 4 /C composite with a layer of hydrogenated titanium dioxide (H-TiO 2 ), resulting in a hollow-structured H-TiO 2 /Fe 3 O 4 /C material. This structure not only ensures the formation of a dual-core shell structure, but also reduces the proportion of carbon material in the composite electrode, thereby enhancing the theoretical specific capacity of the composite electrode. The presence of H-TiO 2 and carbon improved the cyclic stability of Fe 3 O 4 within the composite. This hollow sandwich–structured composite demonstrated excellent electrochemical performance, delivering a discharge specific capacity of 629.5 mAh g −1 after 500 cycles at 0.2 A g −1 , along with a high initial coulombic efficiency of 80.6%.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Yaru Sun,Yanyan Zou,Yan Liu,Bo Cheng,Ying Hou,Fenglei Huang
Multifunctionality is a key direction for future protection, but effectively integrating multiple functions remains a significant challenge. Here, a self-cross-linked composite aerogel (PI/20Fe 3 O 4 @TS-Fe), core-shell Fe 3 O 4 (Fe 3 O 4 @TS-Fe) with amino groups can interact with acidic sites in polyimide (PI), is designed to achieve intelligent fire protection, radar stealth, and highly efficient heat-insulated performance. The PI/20Fe 3 O 4 @TS-Fe aerogel exhibits superior fire protection properties compared to neat PI aerogel. It achieves a 44.3 % lower peak heat release rate and a 57.8 % lower total heat release. Additionally, the enhanced thermoelectric properties of PI/Fe 3 O 4 @TS-Fe/GO enable accurate temperature sensing and stable fire-warning performance, with clear warnings lasting over 20 min. Furthermore, the synergistic effect of the structure and components endows the aerogel composite with dielectric loss capability for effective electromagnetic wave (EMW) absorption. The minimum reflection loss ( RL min ) is −25.6 dB, and the effective absorption bandwidth ( EAB ) is 2.5 GHz. The radar cross section ( RCS ) simulations also further confirmed that the self-cross-linked Fe 3 O 4 /PI composite aerogel possess potential for radar stealth in practical applications. This work provides a novel pathway to fabricate multifunctional aerogel via designing a self-cross-linked structure.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Shan Wang,Xinyan Zhang,Changlong Yan,Yao Zhang,Kefeng Zhang,Baoyou Shi,Jinhu Liu,Haotian Hao,Xin Huang
The reduction of fluoride concentration in wastewater to ultra-low levels remains a significant challenge, as conventional aluminum-based coagulation suffers from low efficiency at trace levels and high chemical consumption. Herein, a novel magnetic adsorption-coagulation (MAC) process was developed in this study to address this limitation by integrating a lanthanum carbonate/Fe 3 O 4 composite (LC-Fe 3 O 4 ) as a magnetic seed with polyaluminum chloride (PAC). Sole LC-Fe 3 O 4 adsorbent exhibited a high fluoride adsorption capacity of 215.3 mg F/g (pH 7, 298 K, 0.1 g/L, 24 h), fitting well with Langmuir and Freundlich models and following the pseudo-second-order kinetic model. It maintained robust performance across a wide pH range (5.0–9.0) and exhibiting strong selectivity toward fluoride even in the presence of competing HCO 3 − , CO 3 2− , SO 4 2− , and NO 3 − anions, whereas PO 4 3− significantly interfered. This study revealed that the mechanisms of fluoride removal during LC-Fe 3 O 4 adsorption process mainly included ligand exchange, electrostatic attraction, and inner-sphere complexation with La 3+ sites. When applied for treating real secondary effluent, this novel MAC process achieved simultaneous and efficient removal of both fluoride and turbidity. Under optimized conditions, fluoride and turbidity removal efficiencies reached 69.12% and 95.2%, respectively, significantly outperforming sole coagulation. This enhancement might be attributed to the synergistic effects of adsorption on the magnetic seeds and the formation of denser and separable flocs. Furthermore, the LC-Fe 3 O 4 seed showed excellent regenerability and reusability over multiple cycles, underscoring the practical potential of the MAC strategy for advanced wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Quanhui Hou,Qianyang Wang,Xiao Xu,Zhihao Xu,Peng Jiang,Maziar Ashuri,Yunxuan Zhou,Zhao Ding
Developing efficient and scalable catalysts remains crucial for advancing practical MgH 2 -based solid-state hydrogen storage. In this work, an oxide-precatalyst strategy is proposed, where Fe 3 O 4 nanoparticles are uniformly anchored on leaf-derived porous carbon to form a Fe 3 O 4 /leaf-carbon catalyst that converts in situ into highly dispersed Fe/MgO interfaces during the initial dehydrogenation process. The resultant MgH 2 + 10 wt% Fe 3 O 4 /leaf-carbon composite exhibits a markedly improved hydrogen sorption performance, with an onset desorption temperature of 215 °C, releasing 6.41 wt% H 2 within 8 min at 350 °C, and reabsorbing 6.22 wt% H 2 at 175 °C (3 MPa) within 1 h. Notably, the activation energies for hydrogenation and dehydrogenation are drastically reduced to 53.27 kJ mol −1 and 91.45 kJ mol −1 , respectively. Furthermore, after undergoing 20 consecutive adsorption cycles, this composite material still maintained 96.3 % of its hydrogen storage capacity compared to the initial hydrogen absorption. Structural characterizations confirm that Fe 3 O 4 is reduced to Fe while forming a stable Fe/MgO heterointerface that provides abundant active sites and accelerates hydrogen diffusion. This study elucidates the oxide-to-metal interface transformation mechanism as an effective pathway to simultaneously lower thermodynamic barriers and enhance kinetic reversibility, offering a cost-effective and sustainable strategy for engineering next-generation MgH 2 -based hydrogen storage materials.
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Additive Manufacturing
·
2021
·
IF 10.998
Chengbin Yue,Miao Li,Yingtao Liu,Yiqun Fang,Yongming Song,Min Xu,Jian Li
The combination of shape memory polymer composites and 3D printing technology provides novel opportunities for customized manufacturing and intelligentization of products. Here, we developed magneto-responsive shape memory polymer composites with well-balanced strengths and toughness by adding Fe 3 O 4 and cellulose nanofibers (CNFs) to a poly-hydroxybutyrate/poly(ε-caprolactone) blend as functional particles and reinforcing component. The influences of Fe 3 O 4 and CNFs on the properties including micromorphology, and rheological, melting-crystallizational, thermomechanical, static mechanical, and magneto-responsive shape-memory behaviors were investigated. The results displayed that the PHB/PCL (80:20) composites with 10 wt% Fe 3 O 4 and 0.5 wt% CNFs had the optimal comprehensive mechanical and magneto-responsive shape-memory properties. Moreover, 3D printing tests found that the addition of CNFs and printing parameters were crucial for the mechanical and magneto-responsive shape-memory properties of the resulting products. Finally, the fabrication of a scaffold with excellent load-carrying performance and a magneto-responsive self-recovery snowflake demonstrated the application feasibility of our work.
研究领域:
材料科学
·
聚合物复合材料
·
增材制造
·
智能材料
·
纳米复合材料
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Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105663
·
IF 5.909
Zhaohong Xu,Qi Zhu,Jumeng Bian
In this study, to deal with the problem of emulsified oil contamination, Fe 3 O 4 magnetic nanoparticle (MNP) was synthesized by thermal solvent method, then chitosan (CS) was applied to the surface of Fe 3 O 4 to form Fe 3 O 4 @CS and sodium oleate (NaOL) was grafted onto the surface of Fe 3 O 4 @CS. A novel and environmentally friendly material Fe 3 O 4 @CS@NaOL MNP was synthesized. Synthetic MNP that is superparamagnetic and superhydrophobic which is used as a recyclable demulsifier to treat emulsified oil wastewater and its demulsification performance was evaluated. Especially, the effects of pH, demulsifier dosage and salt concentration on oil separation efficiency have been studied detailedly. The results show that the light transmittance of the emulsified wastewater increases to the highest when Fe 3 O 4 @CS@NaOL is added 400 mg/L. In addition, the new synthetic material has at least 8 cycle life and nearly no impact on demulsification performance. What’s more, the new synthetic material has at least 8 cycle life and nearly no impact on demulsification performance. In addition, the demulsification mechanism was also explored. The results indicate that the emulsified oil is effectively attached to Fe 3 O 4 @CS @NAOL under acidic and neutral conditions by electrostatic attraction. Especially after the introduction of NaOL, demulsification performance has been improved obviously. In conclusion, its preparation method is simple and easy to recycle. It provides a new feasible way to make a new demulsifier for the treatment of emulsified oil wastewater.
研究领域:
环境科学
·
材料化学
·
纳米技术
·
水处理
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Chemosensors
·
2026
·Vol. 14
·期 1
·19
·
IF 3.7
Yu Yang,Danning Li,Changchang Zheng,Ling Zhang,Xuwei Chen
Enzymatic electrochemical sensors are promising for real-time glucose monitoring due to their high sensitivity and continuous detection capability. In this work, a magnetic Fe3O4@MXene nanocomposite was synthesized hydrothermally. The introduction of Fe3O4not only reduced MXene’s inherent negative surface charge, improving interaction with glucose oxidase (GOD), but also formed a porous structure that enhances enzyme immobilization via physical adsorption. Based on these properties, a Fe3O4@MXene/GOD/Nafion/GCE electrode was fabricated. The composite’s high specific surface area, excellent conductivity, and good biocompatibility significantly promoted the direct electron transfer (DET) of GOD. Meanwhile, the apparent electron transfer rate constant (ks) was calculated to be 9.57 s−1, representing a 1.26-fold enhancement over the MXene-based electrode (7.57 s−1) and confirming faster electron transfer kinetics. The sensor showed a bilinear glucose response in the ranges of 0.05–15 mM, with sensitivity of 120.47 μA·mM−1·cm−2and a detection limit of 38 μM. It also exhibited excellent selectivity, reproducibility and stability. Satisfactory recovery rates were achieved in artificial serum samples while demonstrating comparable detection performance to commercial blood glucose meters.
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Environmental Technology & Innovation
·
2026
·
IF 7.3
Yanfan Cui,Yujie Wang,Zhongkai Ou,Yixuan Li,Cheng Cheng,Ruirui Qian,Ying Chen,Tao Luo
Nanoplastics (NPs) are emerging environmental pollutants detected in drinking water and human tissues, yet effective removal methods remain limited. This study developed a magnetic flocculation method using nano‑Fe 3 O 4 combined with KCl to remove polystyrene nanoplastics (PS-NPs) from water, and assessed the biosafety of the treated water in male mice. Under optimized conditions (100 mg/mL Fe 3 O 4 , 1 mg/mL PS-NPs, 25 mM KCl), approximately 96% of PS-NPs were removed via magnetic adsorption, as confirmed by fluorescence quantification and transmission electron microscopy. Mice were administered the treated supernatant as drinking water for 42 days. No testicular toxicity, oxidative stress, inflammatory response, or apoptosis was observed in the treated mice, and ERK/JNK/p38 MAPK and Nrf2/HO-1 pathway protein levels remained unchanged. In contrast, mice exposed to untreated PS-NPs exhibited significant testicular damage associated with pathway activation. These findings demonstrate that nano‑Fe 3 O 4 flocculation is an effective method for removing PS-NPs from aqueous solution, and that the treated water is safe for consumption. This approach offers a potential strategy for reducing nanoplastic exposure.
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LANGMUIR
·
2026
·Vol. 42
·期 31
·22812-22822
·
IF 4.4
Li Xiaolong,Wu Yuntao,Hou Xirong,Xia Jing,Xu Yi,Jiang Yujie,Li Mengyi,Qi Wei
Electromagnetic interference (EMI) pollution has emerged
as a critical
challenge alongside rapid advancements in modern electronics. Here,
we report the design and synthesis of multifunctional poly(vinyl alcohol)
(PVA) hydrogels reinforced with MXene/GOP-Fe 3 O 4 composites via a facile one-pot hydrothermal strategy. The unique
combination of two-dimensional conductive fillers and magnetic Fe 3 O 4 nanoparticles endows the composite hydrogels
with enhanced electrical conductivity, magnetic responsiveness, and
structural flexibility. MXene and GOP synergistically construct continuous
conductive networks, while the in situ -generated
Fe 3 O 4 nanoparticles effectively improve low-frequency
electromagnetic wave attenuation through magnetic loss. The optimized
hydrogel achieves an average specific shielding effectiveness (SSE)
of 158.69 dB cm –1 in the 8.2–12.4 GHz range,
coupled with excellent broadband absorption and low density. Besides,
the shielding tube made from composite hydrogel also has 10.5 dB shielding
effectiveness at 10 kHz. Additionally, the composite exhibits pronounced
photothermal conversion capability, reaching 48.5 ° C under xenon
lamp irradiation. These results demonstrate that integrating conductive
and magnetic components within a flexible hydrogel matrix offers a
versatile pathway for developing lightweight, broadband EMI shielding
materials with additional multifunctionality for future wearable and
miniaturized electronic systems.
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高影响因子
NEW CARBON MATERIALS
·
2026
·Vol. 41
·期 3
·583-595
·
IF 7.2
Yunping Hu,Daixuan Gong,Meijie Qu,Ping Tang,Yuezhen Bin
A balance between electrical and magnetic properties is critical for electromagnetic shielding materials to achieve excellent electromagnetic interference (EMI) shielding and attenuation effectiveness across a broad frequency range. We have prepared free-standing buckypaper films (BPFP) decorated with Fe 3 O 4 particles and polyaniline (PANI) by a simple two-step method to meet this requirement. First, buckypaper films decorated with Fe 3 O 4 (BPF) were synthesized by the coprecipitation of Fe 2+ /Fe 3+ ions on buckypaper (BP) which was then coated with a polyaniline layer by the in situ polymerization of aniline monomers. Magnetic characterization revealed that the BPF and BPFP films had saturation magnetization ( M s ) values of 14.3 emu g −1 and 13.0 emu g −1 , respectively, confirming retention of the magnetic phase. The addition of Fe 3 O 4 nanoparticles and polyaniline to BP (30 μm) increased both the magnetic and dielectric losses due to the increased interfacial polarizations and anisotropy energy. 41 μm-thick BPF and BPFP films had an absorption-dominated shielding effectiveness of 35.1 dB and 36.4 dB, respectively, across the 5.85-18 GHz frequency band. These values are respectively 12.9% and 17.0% greater than that of pristine BP, highlighting the positive effect of Fe 3 O 4 -PANI heterostructures on electromagnetic wave dissipation. These films also had the tensile strength, flexibility, and lightness of BP, demonstrating exceptional promise for next-generation electromagnetic shielding materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60574-60589
·
IF 5.8
Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping
In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Siqi Tong,Dan Chen,Xinbai Jiang,Zhixiang Xu,Xiaodong Liu,Jinyou Shen
A novel composite biochar synthesized from Fenton sludge (FS) and sewage sludge (SS) was employed to catalyze persulfate for the removal of 1-H-1,2,4-triazole (TZ). The optimized conditions for the synthesis and operating process were identified through response surface methodology as follow: SS/FS mass ratio = 5:1, catalyst dosage = 0.9 g L −1 and PDS concentration = 0.5 g L −1 . The removal efficiencies of TZ, TOC and organic nitrogen were found to be as high as 97.6%, 80.33% and 100%, respectively, with the addition of Fe 3 O 4 -doped biochar in persulfate catalytic system. Besides, Fe 3 O 4 -doped biochar exhibited superior stability and tolerance to wide range of pH (2–12), temperature (15–45 °C) and co-existing substrate. The reactive oxygen species, which resulted in the catalytic degradation of TZ followed the order of SO 4 ∙− > ∙OH > O 2 ∙− > 1 O 2 , were identified by electron spin resonance and quenching tests. It demonstrated that the radical pathway accomplished with non-radical pathway contributed to the enhanced degradation of TZ, which was further identified by electrochemical experiments. Moreover, the possible degradation pathway of TZ was ascertained and proposed through DFT calculation and LC-MS analysis. These findings illustrated that the novel magnetic biochar would be a promising persulfate catalyst for the treatment of refractory organic matters. In addition, it also provided a new alternative method for the resource utilization of FS and SS.
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