INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Dianchen Feng,Jianshe Zhang,Xiaokun Jiang,Hao Li,Baodui Wang,Yanghuan Zhang
Hydrogen is regarded as an attractive secondary energy carrier because of its high gravimetric energy density and environmentally benign conversion products. However, the practical application of hydrogen energy is still strongly limited by the lack of safe and efficient hydrogen storage materials. Among various solid-state hydrogen storage candidates, MgH 2 has attracted extensive attention due to its high theoretical hydrogen capacity, natural abundance, and low cost. Nevertheless, its practical use is hindered by high thermodynamic stability and sluggish hydrogen absorption/desorption kinetics. In this work, a rod-like Fe 3 O 4 /FeNi 3 heterointerface catalyst regulated by multivalent Mo and V species was synthesized via a one-step hydrothermal route followed by calcination, and its catalytic effect on the hydrogen storage behavior of MgH 2 was systematically investigated. The results show that the addition of the catalyst markedly improves the hydrogen sorption performance of MgH 2 . In particular, the MgH 2 + 5 wt% catalyst composite absorbs 5.70 wt% H 2 within 1 min and desorbs 6.52 wt% H 2 within 10 min at 593 K, indicating a substantial enhancement in sorption kinetics. Meanwhile, the onset dehydrogenation temperature is significantly reduced from 570 K for pristine MgH 2 to 463 K for the catalyst-containing sample, and the apparent dehydrogenation activation energy decreases from 132.66 to 69.85 kJ mol −1 H 2 . Structural and kinetic analyses suggest that the enhanced performance mainly originates from the synergistic effect of the Fe 3 O 4 /FeNi 3 heterointerface, which facilitates H 2 dissociation, interfacial hydrogen transfer, and Mg–H bond activation. The Mo/V species are considered to act primarily as electronic regulators at the surface/interface region rather than as separate bulk crystalline phases. This work provides useful insight into oxide-metal heterointerface engineering for improving the hydrogen storage properties of MgH 2 .
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122227
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IF 7.5
Ying Han,Wanqing Zhao,Xiaoping Zheng,Chuwei Li,Lingyun Tang,Tengfei Zhang,Yawei Xie,Hongyuan Liu
In this study, nFe and Fe 3 O 4 composites (nFe@Fe 3 O 4 ) were prepared for the efficient removal of N -nitrosodimethylamine (NDMA) and triclosan (TCS) in water. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that nFe@Fe 3 O 4 consisted of a core of Fe 3 O 4 surrounded by a layer of spherical nFe. nFe@Fe 3 O 4 exhibited significantly reduced agglomeration, looser structure, slower passivation, and enhanced stability compared to nFe. nFe@Fe 3 O 4 exhibited excellent performance in the removal of NDMA and TCS. Under optimal conditions, the nFe@Fe 3 O 4 system achieved 99.9% removal of both NDMA and TCS after 72 h, significantly outperforming the nFe system alone. It also resisted interference from different pH values and ionic conditions well. The results of product analysis and density functional theory (DFT) calculations revealed that the removal of NDMA in nFe@Fe 3 O 4 was attributed to the cleavage of N=O and N-N bonds. Removal of TCS resulted from chlorine removal and ether bond cleavage. The identification and verification experiments of active species showed that active hydrogen atoms (•H) in solution were responsible for the significant removal of NDMA and TCS. Catalytic hydrogenation was the primary mechanism of this reaction. The Fe(III)/Fe(II) cycle regenerated Fe(II) to slow passivation. Fe 3 O 4 improved the electron transfer and proton conductivity of nFe@Fe 3 O 4 , accelerating its corrosion and enhancing generation of •H. Additionally, nFe@Fe 3 O 4 maintained excellent removal performance under repeated use, stability testing, and real water condition.
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Journal of Materials Chemistry A
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2026
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IF 9.2
Xi Lin,Chenchen Wang,Chaoqun Zhang,Chuanshuang Hu,Yi Yang,Yonghui Zhou,Xiuyi Lin,Jiangtao Xu
Inadequate interfacial polarization relaxation and insufficient synergy between magnetic and dielectric loss mechanisms constitute a major bottleneck impeding the advancement of wave-absorbing materials. This work proposes a carboxylated multiwall carbon nanotube (c-MWCNT) bridging strategy to construct c-MWCNT@Fe3O4–PPy@BNC composite aerogels (FCPB). Leveraging carboxyl–Fe3+ coordination and synergizing with PEG, c-MWCNT induces the formation of mesoporous Fe3O4. This strategy simultaneously enables the development of a 3D conductive network and improves interfacial compatibility with PPy@BNC, fostering the creation of continuous heterogeneous interfaces. Under microwave/terahertz irradiation, the heterogeneous interfaces prompt electron rearrangement due to differences in electrical conductivity and energy levels among components, thereby strengthening interfacial polarization. The optimal FCPB11 aerogel exhibits exceptional microwave absorption performance in the 2–18 GHz band, achieving a minimum reflection loss (RL) of −68.51 dB at 2.14 mm and an effective absorption bandwidth (EAB) of 6.97 GHz at 1.99 mm. Moreover, in the terahertz range (0.1–4.5 THz), it delivers a maximum RL of 44.2 dB and an EAB of 4.01 THz. Cole–Cole curves and DFT simulations further confirm the presence of multiple polarization relaxation processes, while CST simulations demonstrate a minimum radar cross-section of −44 dB m−2. Importantly, the aerogel maintains high microwave-absorbing performance even after exposure to acid, alkali, and high-temperature treatments. This study provides a new strategy for designing green, broadband, and high-performance microwave absorbers.
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Medicine in Novel Technology and Devices
·
2026
·
IF 4.5
Yuqi Li,Jiawei Wang,Dongyan Li,Min Zhang,Lizhen Wang,Yubo Fan
Poly(glycerol dodecanoate) (PGD) is a biodegradable shape-memory elastomer that can be rendered magnetically responsive by incorporating Fe 3 O 4 . However, the effects of Fe 3 O 4 loading on degradation and biosafety remain unclear, which limits the in vivo translation of PGD/Fe 3 O 4 composites. This study aimed to clarify the relationship between Fe 3 O 4 content, degradation behavior, and gastrointestinal biosafety, thereby informing the design of PGD/Fe 3 O 4 devices. Five formulations containing 0, 5, 10, 20, or 40 wt% Fe 3 O 4 were prepared and designated as ION-0, ION-5, ION-10, ION-20, and ION-40. The composites were evaluated by FTIR, SEM/EDS, lipase-mediated degradation under dynamic and static conditions, Caco-2 assays, and 70-day oral exposure in mice. FTIR confirmed Fe 3 O 4 incorporation without altering the principal polyester backbone. Under both degradation conditions, the degradation percentage and medium acidification decreased with increasing Fe 3 O 4 content. Conditioned degradation media from ION-0, ION-5, ION-10, and ION-20 preserved Caco-2 viability and proliferation and maintained ZO-1 and Occludin expression, whereas ION-40 reduced junctional marker expression despite limited overt cytotoxicity. After daily gavage for 70 days, no obvious pathological lesions were observed in the heart, liver, spleen, lung, or kidney in any group, except for the intestine, where evident ileal injury and decreased ileal ZO-1 and Occludin expression were observed in the ION-40 group, whereas the other groups remained well tolerated. Overall, increasing Fe 3 O 4 loading improved structural persistence during degradation but narrowed the biosafety window. Within the present formulation set, composites containing up to 20 wt% Fe 3 O 4 provided the most favorable balance between degradation behavior and intestinal biosafety, supporting their further development for biomedical devices.
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Chuxuan Zhang,Luqiu Lin,Fei Lv,Tuo Zhang,Qiaoling Zhang,Chao Li,Jiacheng Tang,Zihao Wang,Xun Gong
Max bio-oil yield reaches 78.08% with N reduced to 6.74 wt%. • Fe 3 O 4 NPs increase ethanol incorporation to 4.97 g at 260 °C. • Fe 3 O 4 synergizes with ethanol to enhance esterification and hydrogen supply. • Nitrogen species shift toward less condensed and more hydrogenated forms. Ethanol-based thermochemical liquefaction is a promising route for converting microalgae into liquid fuels; however, nitrogen enrichment in the bio-oil severely limits its fuel quality and downstream upgrading. This study investigated how residual Fe 3 O 4 NPs from upstream magnetic harvesting regulate nitrogen transformation during ethanol liquefaction of microalgae. Liquefaction experiments were conducted at 220–260 °C with a fixed Fe 3 O 4 NP loading of 5 wt%. Product distributions, ethanol incorporation, and molecular compositions of the oil phase were analyzed by GC–MS and FT-ICR MS, complemented by DFT calculations. The bio-oil yield ranged from 55.29 to 78.08 wt%, increasing from 68.93 to 78.08 wt% at 260 °C with Fe 3 O 4 . Carbon balance analysis showed that up to 4.97 g of ethanol was incorporated into the products, contributing to both increased oil yield and active hydrogen supply. DFT calculations confirm that Fe 3 O 4 promotes ethanol dehydrogenation, while FT-ICR MS reveals decreased abundance and unsaturation of nitrogen-containing compounds after Fe 3 O 4 addition. Fe 3 O 4 primarily influences nitrogen transformation by facilitating the generation of reactive hydrogen species from ethanol, thereby promoting hydrogenation of nitrogen-containing compounds. However, its contribution to overall nitrogen removal was limited, with the relative nitrogen content decreasing from 7.72 wt% to 6.74 wt% at 260 °C. Overall, residual Fe 3 O 4 was compatible with ethanol liquefaction and influenced both bio-oil formation and nitrogen transformation, offering insight into integrating upstream magnetic harvesting with downstream thermochemical conversion. Download: Download high-res image (141KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Yali Zhao,Mengxin Duan,Ying Zhang,Sibo Huang,Qingxin Guan,Wei Li
A pH-tunable metal–phenolic precursor enables uniform core–shell Fe 3 O 4 -FeC x @C. • P123 serves as structure-directing agent and defect inducer to create carbon vacancies. • Active H* may be adsorbed on carbon-defect sites, which suppresses undesirable over‑hydrogenation. • Fe 3 O 4 , Fe 2 C, and Fe 5 C 2 synergistically drive RWGS and C-C coupling to light olefins. • Catalyst achieves 54.95% CO 2 conversion, 45.48% light olefins selectivity, and 100 h stability. The conversion of CO 2 to light olefins via the reverse water-gas shift and Fischer-Tropsch synthesis (RWGS-FTS) tandem pathway offers a sustainable route to value-added chemicals, yet precise control over the catalyst microstructure remains challenging. Here, we report a defect-engineered core-shell catalyst, Fe 3 O 4 -FeC x @C, synthesized from pH-tunable metal-phenolic networks (MPNs) precursor and a P123 soft template. The MPNs ensure uniform dispersion of iron species, while P123 generates abundant carbon defects in the graphitic shell. The resulting Fe 3 O 4 -FeC x @C-P-p2 catalyst features a unique architecture where the core activates H 2 and CO 2 , and the defective shell may promote the adsorption of active hydrogen species, which could spatially decouple active H* from C C coupling. Combined with previous reports, Fe 3 O 4 and FeC x may work synergistically: Fe 3 O 4 could acts as active sites for the RWGS reaction, while FeC x facilitates C C coupling, offering an efficient strategy to boost light olefin selectivity in CO 2 hydrogenation. The carbon shell provides spatial confinement to prevent sintering, while defect sites may promote the adsorption of H*. Under optimized conditions, the catalyst achieves 54.95% CO 2 conversion and 45.48% light olefin selectivity, with no significant deactivation over 100 h. This work demonstrates a synergistic strategy combining defect engineering, hydrogen spillover, and phase cooperation for efficient CO 2 hydrogenation. A defect-rich graphitic carbon shell encapsulates an Fe 3 O 4 -FeC x core to form a core-shell catalyst via a metal-phenolic network (MPN) self-assembly strategy. The defective carbon layers may adsorb spillover active H*, tuning intermediate hydrogenation for higher olefin selectivity. This architecture achieves 54.95% CO 2 conversion and 45.48% light olefins selectivity, with outstanding stability over 100 h, providing a robust platform for efficient CO 2 -to-olefins conversion. Download: Download high-res image (181KB) Download: Download full-size image
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6176-6185
·
IF 3.3
Fengjie Bu,Qianrui Xu,Wenjie Jiang,Yingying Wei,Zhifei Wang,Yong Jiang
Magnetic polymer microspheres have received a lot of attention owing to their high biocompatibility, superparamagnetism, and widespread use in protein purification, cell separation, medical diagnosis, targeted drug delivery, and environmental wastewater treatment. In this study, a facile method for preparing magnetic polymer microspheres was presented. First, hollow poly(divinylbenzene-co-methacrylic acid) (P(DVB-co-MAA)) microspheres were synthesized by one-step reflux-precipitation polymerization. Second, Fe3O4 magnetic nanoparticles were precipitated in situ within the microsphere cavities. Magnetic Fe3O4@P(DVB-co-MAA) microspheres have a uniform particle size, good suspension stability, superparamagnetism, and abundant surface functional groups. The particle size of the microspheres as well as the modification of the surface functional groups can be controlled to meet the requirements for practical applications. Furthermore, the magnetic Fe3O4@P(DVB-co-MAA) microspheres show good protein separation capacity. Therefore, this method will have potential in the application of protein separation and purification.
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COMPOSITES COMMUNICATIONS
·
2023
·
IF 8
Yunsheng Da,Qiang Liu,Ling Kong,Yiming Du,Xingyou Tian,Yanyan Liu,Hua Wang
In this work, a high-performance electromagnetic interference (EMI) latent curing epoxy composites with combination of modified Fe 3 O 4 and carboxylic carbon nanotube (CNTs) were prepared by magnetic orientation. The unique heterogeneous interface among magnetic nanoparticles and conductive nanowires facilitates the loss of interface polarization, the wave absorbance and the dipole polarization, makes EMI SE T of the material reach respectively 45.86 dB in X-band at the thickness of 2 mm ± 0.1 mm, significantly exceeding that of other epoxy-based shielding materials. In addition, the composites show excellent thermal capacity reaching 1.59 W/m·K. What's more, the oriented epoxy mixture can be preserved at room temperature for 40 days maintaining a low viscosity state without curing, which has a strong practical application prospect in the field of electronic packaging materials.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hanxin Wu,Xiaohan Jiang,Jianhao Tong,Jing Wang,Jiyan Shi
Nowadays, Lead (Pb) and Cadmium (Cd) contamination in rice is an important worldwide environmental concern. Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) and Nano hydroxyapatite (n-HAP) are promising materials to manage Pb and Cd contamination. This study systematically investigated the effect of Fe 3 O 4 NPs and n-HAP on Pb and Cd stressed rice seedlings’ growth, oxidative stress , Pb and Cd uptake and subcellular distribution in roots. Furthermore, we clarified the immobilization mechanism of Pb and Cd in the hydroponic system. Fe 3 O 4 NPs and n-HAP could reduce Pb and Cd uptake of rice mainly through decreasing Pb and Cd concentrations in culture solution and combining with Pb and Cd in root tissues. Pb and Cd were immobilized by Fe 3 O 4 NPs through complex sorption processes and by n-HAP through dissolution-precipitation and cation exchange, respectively. On the 7th day, 1000 mg/L Fe 3 O 4 NPs reduced the contents of Pb and Cd in shoots by 90.4% and 95.8%, in roots by 23.6% and 12.6%, 2000 mg/L n-HAP reduced the contents of Pb and Cd in shoots by 94.7% and 97.3%, in roots by 93.7% and 77.6%, respectively. Both NPs enhanced the growth of rice seedlings by alleviating oxidative stress and upregulating glutathione secretion and antioxidant enzymes activity . However, Cd uptake of rice was promoted at certain concentrations of NPs. The subcellular distribution of Pb and Cd in roots indicated that both NPs decreased the percentage of Pb and Cd in the cell wall, which was unfavorable for Pb and Cd immobilization in roots. Cautious choice was needed when using these NPs to manage rice Pb and Cd contamination.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
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IF 5.8
Ziwei Liang,Yuhui Wang,Jiapu Wang,Tao Xu,Shilong Ma,Qi Liu,Liqin Zhao,Yan Wei,Xiaojie Lian,Di Huang
Ferroptosis is a novel form of regulated cell death induced by iron-dependent lipid peroxidation imbalance. It has emerged as a promising antitumor therapeutic strategy in recent years. In this work, we successfully synthesized a complex magnetic nanocube Fe 3 O 4 modified with PEI and HA by the thermal decomposition method. While loading a ferroptosis inducer RSL3 inhibited cancer cells through the ferroptosis signal transduction pathway. The drug delivery system could actively target tumor cells through an external magnetic field and HA-CD44 binding. Zeta potential analysis showed that Fe 3 O 4 [email protected] nanoparticles were more stable and uniformly dispersed in tumor acidic environment. Moreover, cellular experiments demonstrated that Fe 3 O 4 [email protected] nanoparticles could significantly inhibit the proliferation of hepatoma cells without a cytotoxic effect on normal hepatic cells. In addition, Fe 3 O 4 [email protected] played a vital role in ferroptosis by accelerating ROS production. The expression of ferroptosis-related genes Lactoferrin, FACL 4, GPX 4 and Ferritin was significantly suppressed with increasing treatment of Fe 3 O 4 [email protected] nanocubes. Therefore, this ferroptosis nanomaterial has great potential in Hepatocellular carcinoma (HCC) therapy.
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TALANTA
·
2023
·
IF 6.1
Haotian Wu,Gang Zhang,Xiaozhan Yang
An electrochemical biosensor based on iron tetroxide (Fe 3 O 4 )/carboxylated carbon nanotubes (MWCNTs-COOH)/gold nanoparticles (AuNPs) was designed for the detection of alpha-fetoprotein (AFP), which is often used as an important indicator for the early clinical diagnosis of liver cancer markers. The Fe 3 O 4 /MWCNTs-COOH nanocomposite was synthesized by a solvothermal method and it combined with gold nanoparticles (AuNPs) deposited at the constant potential on a glassy carbon electrode to form Fe 3 O 4 /MWCNTs-COOH/AuNPs, which intensifies the electrical signal while the large active sites enable more stable immobilization of the AFP monoclonal antibodies on the electrode. The electrochemical performance of Fe 3 O 4 /MWCNTs-COOH/AuNPs was investigated in detail and the electrochemical response signal after the immune reaction with the AFP antigen-antibody was recorded. The peak current Ip of the response signal is linearly proportional to the lg c AFP in the range of 1 pg mL −1 –10 μg mL −1 , with a detection limit of 1.09034 pg mL −1 and good performance in clinical sample testing. The proposed sensor has shown great application and development potential in clinical medicine field.
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Polymers
·
2023
·Vol. 15
·期 1
·248
·
IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
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