JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Elvis Ikechukwu Nosike,Zhenqi Jiang,Lijing Miao,Ozioma Udochukwu Akakuru,Bo Yuan,Shasha Wu,Yuenan Zhang,Yujie Zhang,Aiguo Wu
This research reports a new mercury adsorbent in which Fe 3 O 4 as a core was embedded into the shell of ZIF-90 in a one-pot synthesis and the subsequent post synthesis modification (PSM) of its surface with cysteine covalently, via a Schiff’s base reaction. Poly acrylic acid (PAA) was capped on the surface of nanoparticles to prevent agglomeration of the nanoparticles. In addition, −COOH groups of PAA coordinated with Zn 2+ of ZIF-90 and this provided the platform for ZIF-90 to grow on the nanoparticles forming the core-shell structure. Based on the strong interactions between the thiol groups on the adsorbent and mercury ions as elucidated by the XPS analysis, the as-synthesized adsorbent showed selectivity for Hg 2+ . The sorbent exhibited high adsorption capacity of 900 mg g −1 towards Hg 2+ as calculated at pH 4 and the adsorption kinetics followed pseudo-second-order kinetics model better. The Hg 2+ loaded adsorbent was easily regenerated and it maintained about 70 % efficiency after the third use. Low-cost, readily available and green materials, facile preparation, efficient removal and the breakthrough in three times recyclability give the novel ZIF-90 based hybrid nanoadsorbent wide prospects in the field of environmental remediation as a good adsorbent for Hg 2+ removal in wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Xiaoshu Lv,Yunjun Hu,Jie Tang,Tiantian Sheng,Guangming Jiang,Xinhua Xu
This study describes the chromium (VI) removal in aqueous solution by nanoscale zero-valent iron (nZVI)-Fe 3 O 4 nanocomposites, which were prepared by a novel in situ reduction method. The effects of several factors, including ionic strength, temperature, co-existing anions and cations and natural organic matters were evaluated. The ionic strength was found to be insignificant to the removal efficiency, while temperature was critical. With the increase in temperature from 10–40 °C, 32% removal efficiency increased within 2 h from 49.96%. Most anions hindered the reaction, especially in high concentration, such as HCO 3 - and PO 4 3 - , causing a drop of the removal efficiency from 66.48% to 57.47% and 59.93% respectively. In contrast, both cations and moderate natural organic matter facilitated the removal of Cr(VI). It is noteworthy that calcium hardness can greatly promote the reaction, 100% removal efficiency was achieved within 90 min and the rate constant k 2 reached 0.528 g mg −1 min −1 after adding 40 mg L −1 Ca 2+ , which was ten times more than that in other cases. Possible mechanism was presented, and TEM, SEM and FITR analyses were used to verify these speculations. Hopefully, these results can contribute to a better development of the water treatment facilitates for nZVI-Fe 3 O 4 composites, maintaining its high efficiency in real aqueous environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Fu Yang,Xu Hu,Shuying Gao,Xianfeng Liu,Shijian Zhou,Yan Kong
Herein, we report a facile synthetic method enabling the synchronously activated decoration of the inner core and mesoporous outer shell of monodispersed Fe 3 O 4 @meso-silica using in situ implanted MnO x . This approach can maintain the catalytic activity of the internal core without loss of its inherent magnetic properties even when undergoing calcination . The developed catalyst exhibits a well-defined core-shell configuration with a MnO x coating on an Fe 3 O 4 internal core and a MnO x -modified mesoporous outer shell, obtained via only a one-pot output cycle. The thin MnO x coating layer prevents excess oxidation of the unoxidized Fe 3 O 4 core during the annealing process. Additionally, the mesopores in the coated silica were synchronously functionalized by the assistance of dodecylamine (DDA) as surfactant because of the coordination effect of Mn 2+ and DDA molecules. The optimal nanocatalyst exhibits improved catalytic activity for styrene oxidation and recoverability due to its magnetic-responsive properties, in contrast to postsynthesized and shell-only functionalized catalysts.
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High Voltage
·
2025
·Vol. 10
·期 1
·219-227
·
IF 4.9
Zeyu You,Ling Weng,Lizhu Guan,Xiaorui Zhang,Zijian Wu,Hao Chen,Wei Zhao
Epoxy resin (EP), as a resin material with excellent insulation performance, has been widely applied in fields such as electronics, coatings, ships etc. However, epoxy resins generally have poor thermal conductivity, which limits their application in the field of new generation of electronic packaging. To address the key issues mentioned above, the BN@Fe 3 O 4 particles with positive out-of-plane thermal conductivity were successfully prepared in this study, having a core-shell structure with rough surfaces as well. As a thermal conductive powder, the disadvantage of hexagonal boron nitride being easily agglomerated in resin has been improved. By applying an external magnetic field, three-dimensional thermal conduction pathways were constructed in the matrix. The physical and chemical properties of the BN@Fe 3 O 4 powder and its composite materials were analysed and tested. The experiment indicates that the thermal conductive magnetic powder BN@Fe 3 O 4 had been successfully prepared. When the filling amount of BN@Fe 3 O 4 reached 27.5 vol%, the out-of-plane thermal conductivity of the composite material was 1.758 W m −1 K −1 , which was 982.12% that of pure EP. At this point, the mechanical behaviour and insulation performance of EP composite materials can be effectively guaranteed at the same order of magnitude as pure EP performance.
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RSC Advances
·
2022
·Vol. 12
·期 5
·2623-2631
·
IF 4.036
Kexin Zhou,Xing-peng Liu,Hongyun Guo,Hui-qiang Li,Ping Yang
Heterogeneous electro-Fenton is one of the promising technologies to degrade refractory organic phosphonates. In this work, CoNWs@CoAl-LDHs/Fe3O4 and CoNPs@CoAl-LDHs/Fe3O4 were successfully synthesized by a co-precipitation method and applied to degrade 1-hydroxyethane-1,1-diphosphonic acid (HEDP) and glyphosate (PMG) via an electro-Fenton process. The results indicated that the removal rate of HEDP (100 mg L−1) and PMG (100 mg L−1) by CoNWs@CoAl-LDHs/Fe3O4 increased from 62.09% and 95.31% to 82.45% and 100%, respectively. The CoNPs@CoAl-LDHs/Fe3O4 electro-Fenton system could remove 70.03% of HEDP and nearly 100% of PMG within 2 hours at a pH of 3. Moreover, we compared the SEM, EDS, XRD and BET results of CoNWs@CoAl-LDHs/Fe3O4 with those of CoNPs@CoAl-LDHs/Fe3O4. The effects of initial pH, CoNW dosage and reaction time on the degradation of HEDP and PMG were discussed. CoNWs@CoAl-LDHs@Fe3O4 could even remove 71.03% of HEDP at a neutral pH. After four cycles of repeated use at a pH of 3, the removal rate of HEDP by CoNWs@CoAl-LDHs/Fe3O4 was still higher than 70%. Radical quenching experiments revealed that ˙OH is the dominant active species participating in the heterogeneous electro-Fenton process. Finally, we would talk about the mechanism of the CoNWs@CoAl-LDHs/Fe3O4-based electro-Fenton system.
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PubMed
高影响因子
Microbiology Spectrum
·
2022
·Vol. 10
·期 6
·
IF 9.043
Jun Ren,Menghuan Yu,Wenjin Gao,Chuanfan Ding,Shengjie Li,Shaoning Yu,Wenjun Cao
Prompt clinical diagnosis and antimicrobial therapy are key to managing infective endophthalmitis. The small volume of aqueous humor, low bacterial counts, and empirical medication by physicians make existing diagnostic methods time-consuming and imprecise. Here, we investigated the feasibility of combining Fc-containing mannose-binding lectin-coated Fe3O4 (Fc-MBL@Fe3O4) enrichment with matrix-assisted laser desorption–ionization time of flight mass spectrometry (MALDI-TOF MS) profiling to identify pathogens in aqueous humor. Aqueous humor aspirated from freshly enucleated porcine eyes was treated with different inocula of Staphylococcus aureus, Staphylococcus epidermidis, and Klebsiella pneumoniae. We performed identification directly in aqueous humor samples and after short-term culture of micro-LB broth. Aqueous humor endophthalmitis samples were enriched with Fc-MBL@Fe3O4 and analyzed using MALDI-TOF MS. The identification time and minimum bacterial concentration required for identification were determined. The enrichment efficiency of Fc-MBL@Fe3O4 for different bacteria was greater than (87.5 ± 5.0)%. The objects of direct identification include live bacteria and bacteria treated with antibiotics, which can be completed within 1.5 h. The minimum number of bacteria needed for positive identification was 2.20 × 106 CFU. For micro-LB broth culture, the identification of bacteria can be completed within 6.5 to 9.5 h for aqueous humor samples with an initial bacterial count of tens to hundreds.IMPORTANCE Fc-MBL@Fe3O4 capture not only live bacteria in aqueous humor but also bacteria inactivated by antibiotics. Fc-MBL@Fe3O4 combined with micro-LB broth culture significantly reduced the turnaround time (TAT) by more than half a day by shortening the time required for bacterial identification. Our findings demonstrate that combining Fc-MBL@Fe3O4 enrichment with MALDI-TOF MS identification is a fast, sensitive, and efficient analytical method with great potential for identifying pathogens in aqueous humor samples.
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PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 4
·2079-2086
·
IF 1.134
Hu Xiangna,Bian XingZhong,Yu Shaozhou,Dan Kun
A magnetic Fe3O4@SiO2@Ag@COOH nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stöber method and an in-situ reaction. The superparamagnetic
property of Fe3O4@SiO2@Ag and the decoration with –COOH groups allow efficient enrichment and capture of thiabendazole molecules. A large quantity of sub-10 nm gaps emerge when Ag NPs are decorated on the surface of the SiO2 shell, offering
a dramatic electromagnetic field enhancement induced by localized surface plasmon resonance (LSPR). Finite-difference time-domain (FDTD) simulations show that strong near-field enhancement around the gap areas between the Ag NPs and Au film occurs, which is caused by the coupling between the
LSPR of the Ag NPs and surface plasmon polaritons (SPPs) of the Au film. Due to the superparamagnetic property and high electromagnetic field enhancement, the Fe3O4@SiO2@Ag@COOH NPs/Au film as a SERS substrate can detect 1 μg/L thiabendazole in solution,
showing great potential for SERS detection of environmental pollutants.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Guangli Li,Yafeng Zhang,Rui Zhu,Zian Liu,Yuan Jin,Nanke Ma,Xuliang He
The indiscriminate use and excessive consumption of ciprofloxacin (CIP) may induce adverse effects in both humans and animals, while concurrently contributing to environmental contamination. Hence, there is an urgent demand to establish highly efficient detection methods for trace ciprofloxacin residues. Herein, a highly efficient electrochemical sensor based on ZIF-8 metal-organic framework (MOF)-derived N-containing porous carbon-supported Fe 3 O 4 nanoparticles (Fe 3 O 4 /NPC) was fabricated for the sensitive determination of CIP residues in milk and honey. Due to the synergistic interaction between Fe 3 O 4 NPs and NPC, the composite exhibited large specific surface area, high conductivity, and abundant internal catalytic sites, effectively improving the voltammetric response of CIP. As a result, the Fe 3 O 4 /NPC demonstrated significant electrocatalytic activity for CIP oxidation, with two wide linear response ranges (0.01–1.0 μM and 1.0–10 μM), high sensitivity (3.312 and 0.8574 μM μA −1 ), and a low limit of detection (0.002 μM). The Fe 3 O 4 /NPC/GCE showed strong anti-interfering capabilities even in excess potential interference substances, and could operate stably for at least one month (with a current retention rate of 81.9 %). Moreover, the Fe 3 O 4 /NPC/GCE was successfully applied to the determination of CIP in milk and honey, achieving satisfactory recovery (95.2 %–103.8 %). Considering its significant advantages such as cost-effectiveness, ease of operation, and excellent sensing properties, the Fe 3 O 4 /NPC has broad application prospects on sensitive detection CIP residues at trace level.
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Chunbo Yang,Xiang Yan,Weiwei Gao,Yang Xia,Hongjie Liu,Liuyi Hu,Wenlong Song,Wenkui Zhang,Xinhui Xia,Hui Huang
Two-dimensional (2D) silicon nanomaterial is a promising anode for lithium-ion batteries (LIBs) due to its large specific area, short ion transport path, and minimized volume expansion. However, its batch utilization is greatly limited by complicated synthesis procedures and time or energy consumption. Herein, we report a facile strategy to construct a kind of Si@C–Fe3O4 lamellar composite with enhanced performance as a LIB anode material. The 2D Si nanosheets are thermally exfoliated from the layered Zintl compound CaSi2 reacting with CO2, followed by surface coating of the C–Fe3O4 layer via the decomposition of ferrocene. Throughout 100 cycles, the as-synthesized Si@C–Fe3O4 composite maintains a stable specific capacity of 1000 mA h g–1 at 0.2 A g–1 with a subtle decay. Compared to 2D Si nanosheets, the composite exhibits better specific capacity and rate capability, particularly at high rates. It is found that C–Fe3O4 is an efficient and low-cost component for enhancing the lithium storage capability of Si-based anodes. We expect that this study will provide a simple and scalable path to the practical fabrication of Si-based anodes toward high-performance LIBs.
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ADVANCED POWDER TECHNOLOGY
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2012
·
IF 1.612
Hongtao Cui,Yan Liu,Wanzhong Ren
With same procedure and same starting materials, nearly monodispersed α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 nanoparticles were synthesized on an large scale of about 60 g in a single reaction through a low temperature sol–gel route. The simple preparation process includes the reactions between FeCl 2 and propylene oxide in ethanol solution at boiling point to form a sol and the following drying of the sol. The different iron oxide phases can be obtained just by changing of the drying conditions for the sol solution. The strategy developed in this study offers important advantages over the conventional routes for the synthesis of α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 nanoparticles , showing potential for its application in industrial production of iron oxides.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 4.1
Wu Youyi,Wu Jingyi,Lu Xingyu,Wang Yuanjie,Gao Shiqian,Zhao Yang,Zhu Qionghui,Wang Xuedong
This study presented a new method of dispersive liquid–liquid microextraction based on Fe 3 O 4 nanoparticles-enhanced hydrophobic magnetic deep eutectic solvent (NPE-MDES-DLLME) for the simultaneous enrichment of six estrogens and bisphenols in water samples. The enriched analytes were then detected by ultra-performance liquid chromatography-fluorescence detection (UPLC-FLD). The innovations of the proposed method lie in two aspects: synthesis of a new hydrophobic MDES extractant composed of bis(2-ethylhexyl) phosphate, 1-hexanol, and nickel chloride, and addition of Fe 3 O 4 nanoparticles to enhance the extraction efficiency as well as speed up phase separation. Key parameters affecting extraction efficiency, including MDES composition, sample volume, extraction time, and elution conditions, were systematically optimized. Consequently, the method exhibited excellent analytical performance, characterized by good linearity (0.070–500 µg·L −1 , R 2 > 0.99), high enrichment factors (543–640), and low limits of detection (0.021–0.096 µg·L −1 ). When applied to real water samples, the proposed method yielded spiked recoveries ranging from 90.1% to 112.0% with relative standard deviations (RSDs) below 8.0%. Furthermore, greenness assessments using the ComplexAPI and AGREE metrics confirmed the method’s eco-friendliness. The developed NPE-MDES-DLLME/UPLC-FLD method provided a reliable, sensitive, and cost-effective approach for determining ultra-trace levels of estrogenic and bisphenol pollutants in the aquatic environment. Graphical
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高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Guobin Huang,Zhonghua Pan,Qilong Wang,Qingqing Liang,Jiayi Wu,Yanmei Zhou,Tianju Chen,Wangchuan Xiao
Background Phthalate acid esters (PAEs) are endocrine-disrupting contaminants that require reliable trace-level monitoring in environmental waters. Magnetic dispersive solid-phase extraction (MDSPE) offers a green sample-preparation approach, but its performance is often constrained by the limited adsorption capacity, poor structural integrity, limited reusability, and high material cost of existing sorbents. Developing a stable, magnetically responsive, and high-affinity nanocomposite to overcome these limitations remains a critical challenge. Results A novel ternary magnetic MWCNTs@Fe 3 O 4 @MIL-101(Fe) nanocomposite was successfully synthesized via a facile hydrothermal strategy, where multi-walled carbon nanotubes (MWCNTs) serve as a conductive scaffold intertwining Fe 3 O 4 nanoparticles and MIL-101(Fe) crystals. This unique architecture endows the sorbent with high saturation magnetization (58.9 emu/g) for rapid separation, a large specific surface area (1127.28 m 2 /g), and abundant π-electron-rich sites for enhanced adsorption. Under optimized MDSPE conditions coupled with gas chromatography-flame ionization detection (GC-FID), the method achieved wide linear ranges (0.05-2500 μg/L), ultra-low limits of detection (0.005-0.05 μg/L), and satisfactory absolute recoveries (89.5%-110.6%) in real environmental water samples. The sorbent exhibited good reusability (≥90% after five cycles) and excellent precision (RSDs <9.0%). Greenness assessment using the AGREE metric yielded a score of 0.65, reflecting a moderate-to-high level of environmental sustainability. Significance and novelty This work presents a novel “MWCNT-bridged” strategy that successfully integrates magnetic responsiveness, high porosity, and π-π interaction sites into a single, stable sorbent, resolving the common trade-off between functionality and recoverability in magnetic MOF composites. The rationally designed nanocomposite provides a robust, highly sensitive, and environmentally sustainable platform for monitoring trace PAEs in complex aqueous matrices, advancing the development of functional materials for green analytical chemistry.
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