ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 23
·23981-23993
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IF 2.914
Li Lincheng,Zhong Dengjie,Xu Yunlan,Zhong Nianbing
In order to improve the adsorption efficiency of the adsorbent and solve the problem of separation difficulty, a novel superparamagnetic micro-nano-bio-adsorbent (PDA/Fe 3 O 4 /BC) was prepared by in situ self-assembly of polydopamine (PDA). The results of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and vibrating sample magnetometer (VSM) characterization showed that the size of bio-adsorbent was about 200 nm. PDA and Fe 3 O 4 modifications increased the specific surface area of adsorbent, changed the surface functional group of biochar (BC), and made the adsorbent have super-high magnetization (294.76 emu g −1 ). PDA/Fe 3 O 4 /BC was applied to treat Cr wastewater. The results show that the adsorption of Cr by PDA/Fe 3 O 4 /BC includes single-layer and multilayer adsorption. The adsorption follows the pseudo-second-order kinetic model. The adsorption is spontaneous and endothermic, and its maximum adsorption capacity and activation energy are 25.25 mg g −1 at 318 K and 23.108 kJ mol −1 , respectively. After adsorption treatment, PDA/Fe 3 O 4 /BC still possesses high magnetization (233.04 emu g −1 ). PDA/Fe 3 O 4 /BC can treat actual electroplating wastewater with Cr(VI) concentration from 20 mg L −1 to less than 0.2 mg L −1 , which met the PRC discharge standard (GB/21900-2008) of electroplating pollutants.
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NEW JOURNAL OF CHEMISTRY
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2026
·
IF 2.6
Zhiru Suo,Fushun Li,Yanjun Zhao,Yuan Zhuang,Binbin Huang,Chen Qu,Yifan Ren,Wenhui Li,Chuandong Wu,Jiemin Liu
The discharge of antibiotics into the environment has emerged as a pressing global issue. In particular, the removal of refractory mixed antibiotics requires advanced technologies with high adsorption efficiency and powerful degradation ability. In this study, we synthesized a heterogeneous core–shell Fe3O4@C catalyst as an efficient microreactor for adsorbing and degrading mixed antibiotics of sulfadimidine (SM2) and enrofloxacin (ENR) in aqueous solution under UV–Fenton conditions. The effects of different experimental conditions on the removal of antibiotics were investigated through L9(43) orthogonal experiments, and the synergistic effect and degradation mechanisms were systematically revealed. The results showed that the Fe3O4@C Fenton system demonstrated significantly enhanced catalytic activity, with hydroxyl radical (OH˙) concentrations of approximately 6.2 and 6.7 times higher than those observed in the Fe3O4 and Fe3O4 + AC Fenton systems, respectively. Moreover, the degradation pathway and mechanism analysis revealed that the adsorption and degradation behavior of the two mixed antibiotics in the Fe3O4@C Fenton system could be better described using pseudo-secondary kinetic models. The substantial improvement clearly indicates that the Fe3O4@C composite serves as a highly efficient microreactor for H2O2 decomposition in the Fenton process, thus providing a new avenue for the degradation of mixed antibiotics in water.
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RSC Advances
·
2026
·Vol. 16
·期 6
·5501-5514
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IF 4.6
Lian Yu,Baozi Lu,Zhen Liang,Dabin Wang,Jiarui Lu,Fengyi Wei,Cunzhen Liang
The slow rate of the Fe3+/Fe2+ cycle has decreased the efficiency of photo-Fenton technology for wastewater treatment. Here, a novel GO/MIL-100(Fe)@Fe3O4 heterostructure was constructed by growing Fe3O4 nanoparticles and MIL-100(Fe) onto GO, thus accelerating the Fe3+/Fe2+ cycle and improving catalytic activity, and it was used as a heterogeneous photo-Fenton catalyst for ERY degradation. The catalyst was fully characterized by TEM, XRD, Raman spectroscopy, XPS, N2 adsorption–desorption and UV-vis DRS. The influences of initial solution pH, H2O2 concentration and catalyst dosage on ERY degradation were investigated. Under optimal conditions (initial pH of 4.03, 10.0 mM H2O2, 0.1 g L−1 catalyst), the GO/MIL-100(Fe)@Fe3O4 + H2O2 + vis system removed 97.3% of ERY (0.1 mmol L−1) within 60 min, and the pseudo-first-order rate constant was 0.0575 min−1. Furthermore, the catalyst showed favorable stability, maintaining excellent catalytic activity even after 4 cycles. A possible degradation mechanism of ERY was proposed based on the results of characterization, ERY degradation, and reactive species analysis. Fe3O4, MIL-100(Fe) and GO in the catalyst showed synergistic effects; the photo-induced electrons from MIL-100(Fe) could be immediately transferred to Fe3O4, promoting Fe3+ reduction to Fe2+ in the photo-Fenton reaction. GO in the catalyst could promote electron transfer from MIL-100(Fe) and organics to Fe3O4, significantly promoting the Fe3+/Fe2+ cycle.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Zijie Qu,Shihan Yu,Miao Li,Yumeng Chen,Xia Liu,Xia Zhang,Guodong Zhang,Xiufeng Wang,Fang Wang,Zhiqing Zhang,Ting Zhou
This study designed and synthesized a Fe 3 O 4 @PDA@Ag-Au NPs nanocatalyst featuring a “core-shell-satellite” structure, aimed at efficiently reducing 4-nitrophenol through photothermal catalysis. Under 808 nm near-infrared laser irradiation, the material demonstrated exceptional photothermal performance and catalytic activity. The reduction rate of 4-nitrophenol reached 90.35 %, with a reaction rate constant of 0.1397 min −1 , significantly surpassing that of a water bath heating system at the same temperature. The high efficiency was attributed to two synergistic effects: the photothermal conversion facilitated by the polydopamine shell and the unique resonance effect exhibited by Ag-Au bimetals. This synergy elevated the system’s equilibrium temperature to 50.7 °C (12.8 °C higher than that of pure water) and generated active site pairs on the Ag-Au interface. These sites enhanced critical reaction steps, thereby reducing the activation energy to 13.8 kJ·mol −1 ,a reduction of 24.0 % compared to that observed in the water bath system (18.3 kJ·mol −1 ). This catalyst could be easily recovered using magnets and maintained over 90 % efficiency after seven cycles. By integrating photothermal catalysis, bimetallic synergy, and magnetic separation, this study presents a novel strategy for developing efficient and recyclable catalysts with significant potential for addressing nitroaromatic organic pollutants.
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RSC Advances
·
2015
·Vol. 5
·期 68
·54816-54821
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IF 3.84
Le Zhang,Xingchun Zhou,Hongfei Huo,Wenzhu li,Feng Li,Rong Li
Herein, we introduced a method to encapsulate Pd(0) within TiO2 hollow mesoporous nanostructures. TiO2 hollow spheres offer a number of advantageous characteristics, including low cost, low toxicity, relatively high photocatalytic activity and high chemical stability. In addition, it can also effectively avoid the agglomeration and precipitation of noble metal nanoparticles in the catalytic reaction. The catalyst was characterized by TEM, XRD, XPS, ICP and VSM. We found that the catalyst presented a high activity for HDC of 4-CP under mild reaction conditions. Beyond that, the catalyst could be easily regained by an external magnet from the reaction mixture and recycled seven times without any significant loss in activity.
研究领域:
催化化学
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环境化学
·
纳米材料
·
化学工程
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 13.2
Shiyu Wu,Yao Zhang,Peng Liu,Xiaolei Zhang,Xincheng Cao,Junming Xu
The development of non-noble metal catalysts for the selective hydrogenation of long-chain fatty acids into value-added chemicals remains a significant challenge. Here, an efficient Fe@Fe 3 O 4 catalyst enriched with oxygen vacancies and weak Lewis acid sites was obtained by tuning the reduction temperature. The catalyst enabled complete conversion of stearic acid with a 97.3 % yield of octadecanol under mild conditions, and maintained high activity after 19 cycles. Moreover, when stearic acid was completely converted to alkanes, the yield of octadecane via the hydrodeoxygenation pathway (97.4 %) was markedly higher than that of heptadecane via the decarbonylation pathway (2.6 %), indicating the catalyst's excellent carbon atom utilization efficiency. Mechanistic studies revealed that metallic Fe efficiently dissociates H 2 to generate active hydrogen, while oxygen vacancies and weak Lewis acid sites in Fe 3 O 4 promote carbonyl adsorption and activation. In addition, weak Lewis acid sites interact with the carbonyl oxygen to moderately polarize the C O bond, thereby suppressing undesired C C cleavage. These synergistic effects account for the catalyst's high activity and selectivity, providing guidance for the design of advanced non-noble metal catalysts for fatty acid hydrogenation.
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Desalination and Water Treatment
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2026
·
IF 3.4
Wei Liu,Jin Wang,Yan Hao,Qinghong Zhang,Kecun Ma,Mei Liu,Zhi Chen,Qingguo Chen
Norfloxacin (NFX) is a widely used antibiotic that poses a persistent threat to aquatic ecosystems. The combination of photocatalysis and microalgae has emerged as a promising strategy for antibiotic removal. However, current research predominantly focuses on optimizing photocatalytic conditions and overall system efficiency, often neglecting the dynamic physiological state of microalgae when exposed to the photocatalytic degradation products of NFX (PDPN), which is the mixture of intermediates after 2 h ZGF photocatalysis of 8 mg/L NFX. This study constructed a synergistic degradation system employing a ZnO/g-C 3 N 4 /Fe 3 O 4 (ZGF) composite photocatalyst and Chlorella vulgaris for PDPN removal. Within this synergistic system, our primary focus was on the microalgal activity when cultured in a medium prepared from the PDPN. The results indicated the degradation rate of PDPN reached 82.1% in the synergistic degradation system. Transcriptomic analysis revealed that microalgae exhibited enhanced adaptability to these products, which were generated from ZGF photocatalytic pre-treatment of NFX. Key functional categories, including catalytic activity, oxidoreductase activity, and cytochrome P450 drug metabolism were significantly upregulated. This study indicates that the ZGF/microalgae system simultaneously achieves efficient pollutant degradation and maintains high metabolic potential as revealed by transcriptomic profiling, providing crucial insights for developing stable and sustainable bioremediation technologies.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Yutao Zhu,Jia Qiu,Yulou Qiu,Xuping Shentu,Zihong Ye,Xiaoping Yu
A multifunctional core-shell Fe 3 O 4 @Ru@Pt nanozyme was synthesized. • A cascade multimodal LFIA for sensitive and reliable detection of β-CG was developed. • A 151-fold sensitivity improvement was achieved through cascade amplification. • Four detection modes provided flexible readout and cross-validation. Traditional lateral flow immunoassays (LFIAs) suffer from limited sensitivity and insufficient reliability, which restrict their practical application. To address these challenges, we synthesized a multifunctional core-shell Fe 3 O 4 @Ru@Pt nanozyme with integrated magnetic, optical, catalytic, and photothermal properties. This nanozyme enables a three-step cascade that enhances sensitivity through sequential magnetic enrichment, catalytic amplification, and photothermal amplification. In addition, four detection modes (direct colorimetric, magnetic-enriched colorimetric, catalytic colorimetric, and photothermal) provide flexible readout and cross-validation to improve reliability. Using a specific phage-displayed nanobody as the recognition element, we developed a Fe 3 O 4 @Ru@Pt-based cascade multimodal LFIA for β-conglycinin detection. The photothermal mode achieved a limit of detection as low as 2.02 pg mL −1 , representing a 151-fold improvement over the direct colorimetric mode. The assay also exhibited excellent specificity and satisfactory accuracy in spiked real samples, with recoveries of 83.21%–114.72%. This multifunctional nanozyme-mediated cascade multimodal platform substantially improves both sensitivity and reliability, offering a promising and practical tool for point-of-care testing applications.
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Biosensors-Basel
·
2026
·Vol. 16
·期 6
·303
·
IF 6.2
Yu Chen,Lina Dong,Hengyan Tian,Fei Yang,Dengbang Jiang,Minglong Yuan
Magnetic polymeric microspheres are pivotal solid-phase carriers in chemiluminescence enzyme immunoassays (CLEIA). However, their practical clinical application is frequently hindered by non-specific adsorption, irreversible aggregation, and the intrinsic susceptibility of exposed outermost Fe3O4nanoparticles to oxidation. To overcome these critical bottlenecks, we rationally engineered highly original monodisperseP(St-MMA)@Fe3O4@P(St-MMA) sandwich-structured microspheres. The bespoke amphiphilic outer shell acts as an impenetrable shield against hydration and oxidation, while maintaining a topologically size-matched mesoporous network (average pore size of 13.11 nm) for optimal antibody anchoring. Strikingly, this architecture ensures exceptional long-term colloidal stability, completely preventing macroscopic agglomeration for over six months in buffer solutions. When evaluated in a carcinoembryonic antigen (CEA), CLEIA, our microspheres achieved an ultra-low limit of detection (LOD) of 0.055 ng·mL−1and high analytical recovery (93.37–108.25%). In a head-to-head comparison with industry-standard commercial magnetic beads, the engineered microspheres delivered stronger chemiluminescent signals and lower background noise, demonstrating excellent intra-assay (CV < 4.37%) and inter-assay (CV < 10%) precision. This work establishes a scalable, highly stable materials platform that effectively resolves the persistent oxidation limitations, holding immense practical importance for next-generation ultrasensitive clinical in vitro diagnostics.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 4
·270
·
IF 5.4
Wang Yuqing,Liu Yutong,Liu Ziqi,Wang Xinyue,Yu Menglu,Gao Guanghui,Zhao Yunli,Hong Jing
A novel MXene nanosheet-supported Fe₃O₄@Ag nanozyme, designed for the dual-mode colorimetric and surface-enhanced Raman scattering (SERS) detection of the pesticide thiram in fruits is presented. The composite ingeniously integrates three key functions: magnetic enrichment, SERS signal amplification, and peroxidase-like nanozyme activity. The resulting nanozyme sensor demonstrates high sensitivity and specificity for thiram detection. The colorimetric method showed a linear range of 0.05 µM to 30 µM with a LOD of 0.016 µM, while the SERS method exhibited a linear range of 10 − 4 M to 10 − 8 M with a LOD of 3.44 × 10 − 9 M. This performance satisfies the demands for agricultural safety monitoring. The present work highlights the significant potential of the developed colorimetric-SERS dual-mode nanozyme platform for on-site pesticide residue determination .
Section
Graphical
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JOURNAL OF MOLECULAR STRUCTURE
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2026
·
IF 4.9
Mochou Gao,Haoxuan Mi,Haocheng Xu,Haowen Ren,Congkai Xu,Zhihao Yang,Chenglin Xu,Haotian Li,Lu Sun,Yanbin Yin,Yanbao Zhao,Wensheng Yang,Xueyan Zou
Hierarchical Fe 3 O 4 @NiO core-shell nanospheres are synthesized. • High adsorption capacity of 65.83 mg/g for His-tagged proteins is obtained. • Fe 3 O 4 @NiO NSs exhibit rapid magnetic separation and good reusability (>80% after 5 cycles). • The adsorption follows pseudo-second-order kinetics and Langmuir isotherm model. Magnetic nanomaterials are highly efficient for the separation and purification of histidine-tagged (denoted as His-tagged) proteins. This article reports the facile synthesis of flower-like magnetic Fe 3 O 4 @NiO core-shell nanospheres (NSs) for that purpose. The synthesis involved the initial solvothermal preparation of Fe 3 O 4 NSs, followed by their controlled reaction with nickel chloride under alkaline condition to in-situ deposit a hierarchical NiO nanosphere shell. The unique hierarchical flower-like architecture could provide abundant accessible Ni 2+ coordination sites for protein binding. When isolating the target protein from cell lysate, Fe 3 O 4 @NiO NSs exhibited a high adsorption capacity of 65.83 mg/g toward His-tagged green fluorescent protein with an equilibrium time of 60 min, together with the merit of fast magnetic separation. Systematic adsorption studies revealed that the adsorption process of the target proteins by Fe 3 O 4 @NiO NSs followed pseudo-second-order kinetics and fitted the Langmuir isotherm model, referring to a chemisorption-dominated monolayer adsorption mechanism. Furthermore, the Fe 3 O 4 @NiO nano-adsorbent exhibited excellent stability and reusability, retaining over 80% of initial separation efficiency after five consecutive adsorption-desorption cycles. Therefore, the hierarchical Fe 3 O 4 @NiO NSs, as a kind of high-performance magnetically recoverable nano-adsorbent, could have significant potential for downstream bioseparation and protein purification applications.
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Journal of Energy Storage
·
2026
·
IF 10.7
Ji Ma,Jiazhe Yan,Chang Xu,Jianing Gai,Qinzhen Gong,Xiaotao Dai,Chunting Liu,Fengshou Liu
The electrochemical evolution of heterointerfaces in conversion-type anodes has long been poorly understood. Whether engineered interfaces survive cycling, and if not, how separated phases maintain function, remains unclear. Using two model systems Fe 3 C/Fe 3 O 4 /C (inert conductive phase) and Cu 2 O/Cu/C (oxidizable conductive phase), we uncover two diametrically opposite evolution pathways that are dictated solely by the oxidation behavior of the conductive phase. In the inert Fe 3 C system, the initial core-shell interface completely dissociates. Yet the porous carbon network alone maintains electronic connectivity, creating a remote synergy mode in which the carbon network sustains battery operation by compensating for lost heterointerface contact, without requiring direct interfacial contact between the active phases. In the oxidizable Cu system, we directly visualize a phenomenon. Cu 2 O undergoes an electrochemically driven facet reconstruction from the (111) to the (200) orientation, which progressively lowers the overpotential for the Cu → Cu 2 O reaction and makes the electrode self-optimizing with cycling. Post-mortem electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy provide direct visual evidence for both pathways. Kinetic analysis shows mixed diffusion capacitive control, with the CCC system reaching a 46.5% capacitive contribution at 1.0 mV s −1 . Full cells with K-PBA cathodes achieve 75.0% capacity retention after 1000 cycles at 0.5 A g −1 , demonstrating practical viability. This work challenges the long-held assumption that interfacial retention is necessary for electrochemistry. Instead, it establishes a universal design principle for durable conversion-type anodes. Ensuring electron-transport pathway integrity, whether through direct contact or indirect network connectivity, is the key. The discovery of electrochemically driven facet reconstruction also opens new avenues for controlling surface crystallography under operating conditions.
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