JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Zhuqing Wang,Dayu Wu,Genhua Wu,Ningning Yang,Aiguo Wu
Rhodamine hydrazide modifying Fe 3 O 4 microspheres (Fe 3 O 4 -R6G) was developed for selective detection and removal of mercury ion from water. With a saturation magnetization of 74.2 emu/g, the Fe 3 O 4 -R6G could be simply recollected from water with magnetic separation within a few minutes. The selectivity and adsorption ability of Fe 3 O 4 -R6G for metal cations were studied by fluorophotometry and atomic absorption spectrometry, respectively. The results showed that Fe 3 O 4 -R6G exhibited excellent selectivity for sensing mercury ion over other metal ions in aqueous solution, and also adsorbed 91% of mercury ion. The maximum adsorption capacity of the Fe 3 O 4 -R6G for Hg 2+ ion was 37.4 μmol g −1 . The Fe 3 O 4 -R6G was successfully applied to the determination of Hg 2+ in environmental samples, and could be used repeatedly by treatment with tetrabutylammonium hydroxide.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2012
·Vol. 18
·期 49
·15676-15682
·
IF 5.925
Xiao-Jiao Kang,Yun-Lu Dai,Ping-An Ma,Dong-Mei Yang,Chun-Xia Li,Zhi-Yao Hou,Zi-Yong Cheng,Jun Lin
Graphical Dual response : Monodisperse poly(acrylic acid)-modified Fe 3 O 4 (PAA@Fe 3 O 4 ) hybrid microspheres with dual responses (magnetic field and pH) were successfully fabricated (see figure). The drug release behavior was strongly dependent on pH value due to the unique properties of PAA. Furthermore, doxorubicin (DOX)-loaded PAA@Fe 3 O 4 composites show an enhanced magnetically guided anticancer effect. Monodisperse poly(acrylic acid)-modified Fe 3 O 4 (PAA@Fe 3 O 4 ) hybrid microspheres with dual responses (magnetic field and pH) were successfully fabricated. The PAA polymer was encapsulated into the inner cavity of Fe 3 O 4 hollow spheres by a vacuum-casting route and photo-initiated polymerization. TEM images show that the samples consist of monodisperse porous spheres with a diameter around 200 nm. The Fe 3 O 4 spheres, after modification with the PAA polymer, still possess enough space to hold guest molecules. We selected doxorubicin (DOX) as a model drug to investigate the drug loading and release behavior of as-prepared composites. The release of DOX molecules was strongly dependent on the pH value due to the unique property of PAA. The HeLa cell-uptake process of DOX-loaded PAA@Fe 3 O 4 was observed by confocal laser scanning microscopy (CLSM). After being incubated with HeLa cells under magnet magnetically guided conditions, the cytotoxtic effects of DOX-loaded PAA@Fe 3 O 4 increased. These results indicate that pH-responsive magnetic PAA@Fe 3 O 4 spheres have the potential to be used as anticancer drug carriers.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 2
·339-346
·
IF 1.967
Wei Jinhui,Wu Chengyuan,Wu Xiangchuan,Wu Lina
Bisphenol A (BPA) interferes with the reproduction and endocrine system of humans and wild animals. For the detection of BPA, a sensitive and rapid detection method was established. BPA was imprinted on the surface of Fe 3 O 4 nanoparticles through dopamine self-polymerization. After the removal of BPA, molecularly imprinted microspheres with BPA recognition cavity were formed. The electrochemical impedance response increased with BPA embedded in the molecular imprinting layer. The electrochemical signal was proportional to the concentration of BPA with a linear range from 1 × 10 –11 to 1 × 10 –3 M and a detection limit of 5.78 × 10 –12 M. The proposed biosensor was used to detect the BPA in vegetable oil indicating a promising application in food-field monitoring. Graphic abstract
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 15
·期 1
·24
·
IF 3.8
Yaohui Xu,Yong Li,Zhao Ding,Yang Zheng
To further enhance the safety and energy efficiency of the Fe3O4preparation experiment, we proposed a strategy for synthesizing monodisperse Fe3O4microspheres through a one-step solvothermal process. In this environmentally friendly synthesis method, stable FeCl3∙6H2O was utilized as the sole raw material, while ethylene glycol, characterized by its high boiling point and favorable safety profile, served as the solvent. Additionally, inexpensive and readily available urea was selected to function either as a mineralizer or surfactant. Through this one-step solvothermal reaction, the target product of Fe3O4could be obtained without subsequent calcination under reducing or inert atmospheres, thereby enhancing experimental safety and promoting energy conservation. By controlling the amount of urea added, it became feasible to produce monodisperse magnetic Fe3O4microspheres characterized by complete crystallinity and high yield. Utilizing the as-synthesized Fe3O4as a catalyst, we investigated its photocatalytic activity against xylenol orange organic dyes along with its regeneration characteristics. When 40 mmol of urea was incorporated into the reaction mixture, the resulting Fe3O4sample exhibited optimal photocatalytic performance; a 20 mg/L xylenol orange solution became colorless and transparent after just 1.5 h of UV light irradiation. Furthermore, during five consecutive regeneration cycles, its catalytic activity could be restored to its initial level. Importantly, Fe3O4demonstrated excellent magnetic sensitivity properties that facilitated rapid targeted separation under an external magnetic field, providing convenience for recovery and collection purposes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 22
·11847-11856
·
IF 7.443
Yu Jiang,Zhong-Jie Jiang,Lufeng Yang,Shuang Cheng,Meilin Liu
The encapsulation of transition metal oxide (TMO) particles in a graphene hollow shell to form a core-void-shell structure is an attractive way to improve the electrochemical performance of TMO-based electrodes for lithium ion batteries (LIBs). First, the continuous graphene shell may enhance the electrical conductivity of the electrodes and thus facilitate current collection and charge transfer associated with lithium storage. Second, the unique shell structure may suppress the aggregation of the core TMO particles while the void space between the core and shell may accommodate the large volume changes of the core during charge–discharge cycling, which enhances electrode stability against cycling. Third, the high specific surface area may improve the accessibility of active electrode materials to the electrolyte, which could effectively reduce the solid-state diffusion length and thus enhance Li ion transport and rate capability. When tested in a LIB, a Fe3O4@rGO composite electrode exhibits an initial reversible capacity of 1236.6 mA h g−1, which is much higher than that of an electrode based on bare Fe3O4, a physical mixture of Fe3O4 and graphene, or other forms of Fe3O4 reported in the literature. In addition, the cycling performance and rate capacity are also much better. The results clearly demonstrate that this unique electrode architecture is ideally suited for LIBs and other electrochemical energy storage and conversion devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Jianyu Mao,Wei Jiang,Junjun Gu,Shuai Zhou,Yue Lu,Tan Xie
In this article, magnetic P (St-DVB)/Fe 3 O 4 microspheres with hollow and porous structure were successfully fabricated by a seed swelling polymerization process for fast and selective absorption of oils from water surface. These microspheres, with unsinkable, magnetic, hydrophobic and oleophilic properties, were used to absorb different oils up to 8.42 times of the particles’ weight while repelling water completely. More importantly, the oil-absorbed microspheres could be removed from water surface efficiently via introducing an external magnetic field. This material also shows excellent reusability after washing with ethanol and the oil-absorption capacity of the material was not sharply reduced even after the 10th cycle. The discoveries presented in this study might provide a low-cost, effective, and environmental-friendly approach for the clean-up of oils and organic solvents on the water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 117
·96911-96917
·
IF 3.84
Zhenliang Feng,Wenrui Wei,Litong Wang,Ruoyu Hong
Cross-linked PS-DVB/Fe3O4 microspheres (PFM-3) have been successfully synthesized by a new magnetic colloid swelling polymerization method and further functioned by alternatively using methylamine and 1,4-butanediol diglycidyl as monomers to build a branching polymer with quaternary ammonium groups. The characterization of PFM has been performed by XRD, FT-IR, SEM, TEM and BET surface area analyses. The results showed that PFM-3 possessed a high ion adsorption capacity (149.25 mg g−1) and could adsorb nitrate ions from water efficiently. The material also showed excellent reusability (after washing with sodium chloride, the absorption capacity was little reduced). More importantly, the magnetic microspheres could be removed from waste water easily via introducing an external magnetic field, which made the discoveries in this study provide an effective and environmentally friendly approach for fast removal of nitrate from waste water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
·
2021
·
IF 1.312
Limin Ren,Yingying Huang,Bingshan Zhao,Lanying Xu,Tao Long
A fast, simple, and efficient sample pretreatment technique based on magnetic dodecyl functionalization of magnetic ferrite microspheres has been developed for the extraction and pre-concentration of phthalate esters from environmental water prior to high-performance liquid chromatography analysis. The magnetic composite microspheres were prepared using Fe3O4 microspheres as magnetic core and silica as a shell with the surface-modified with C12 material. The structure of the prepared microspheres was characterized by Fourier transform infrared spectrometry, scanning electron microscopy, and vibrating sample magnetometry. Three kinds of phthalate esters were selected as model compounds to optimize the main parameters that affect extraction efficiencies, such as adsorbent dosage, sample volume, salt addition, extraction time, pH of sample solution, desorption time, eluent type, and volume. Under the optimal conditions, limits of detection (LODs) of 0.025–0.107 ng mL−1 and limits of quantification (LOQs) of 0.083–0.357 ng mL−1 were achieved. The developed method was applied for the detection of the three PAEs in a spiked sample of river water, and satisfactory recoveries in the range of 76.3–98.9% were obtained with good repeatability (RSD < 4.7%). The entire analysis process can be completed in about 30 min.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xinyi Wan,Yingqing Zhan,Zhihang Long,Guangyong Zeng,Yang Ren,Yi He
To develop high-performance magnetic polymer composites, we reported a facial mussel-inspired way to functionalize Fe 3 O 4 microspheres with dopamine (DA) and KH550, followed by compounding with poly (arylene ether nitrile) (PEN), to prepare functional nanocomposite films. Such mussel inspired co-modification of Fe 3 O 4 was characterized and confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Therefore, the outstanding properties of the functionalize Fe 3 O 4 /polymer composites were obtained. With the addition of 15 wt% functionalized Fe 3 O 4 , the saturation magnetization (Ms) and dielectric permittivity of the PEN composites were increased to 12.49 emu/g and 14.3 (250 Hz), respectively, while the low dielectric loss was maintained. In addition, even the high loading content of Fe 3 O 4 was incorporated, the functional PEN composites still exhibited high mechanical properties and thermal stability, including the significant improvement in glass transition temperature, and the same level of the tensile strength compared with neat PEN. Our work revealed that magnetic and dielectric PEN composites materials along with high comprehensive properties may be potentially used in the electromagnetic fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jixin Yao,Kang Zhang,Wen Wang,Xueqin Zuo,Qun Yang,Mingzai Wu,Guang Li
Excellent electrochemical stabilities and superior electrocatalytic activities of inexpensive counter electrodes (CEs) play an essential role in the large-scale practical application of dye-sensitized solar cells (DSSCs). Herein, the spherical Fe 3 O 4 was selected as a CE and high power conversion efficiency ( PCE ) of 8.76% was achieved, which was more than Pt's efficiency (7.80%). Unfortunately, the efficiency decreased expeditiously (from 8.76% to 7.88%) in three consecutive measurements. Cyclic voltammetry ( CV ) tests also reveal that the Ox1 and Red1 peaks of the CE disappear after a few cycles, which could be attributed to the fact that pure Fe 3 O 4 was easily corroded in the electrolyte, and the catalytic activity was gradually lost after repeated tests. Here, a novel strategy is that Fe 3 O 4 spheres are encapsulated within the 3D reduced graphene (3DRGO) networks to enhance the stability of CV. Three consecutive photovoltaic measurements demonstrate that PCE of the cell with Fe 3 O 4 @3DRGO nanocomposites as CE has been enhanced and the cell shows surprising stabilization (PCE = 9.10%, 9.07% and 9.05% in the three consecutive tests, respectively). The specific surface area of the composite is increased after introducing 3DRGO, which is helpful for electrons transferring rapidly from external circuit to the system of redox to catalytically reduce triiodide, and also decreases charge-transfer resistance. This work not only achieves the outstanding photovoltaic performance and stabilization, but also offers a promising strategy in constructing 3D nanomaterials with novel structure for wide energy applications.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Li Li,Guang Li
A straightforward solvothermal methodology was employed to synthesize Fe 3 O 4 microspheres and Fe 3 O 4 @C hybrids, where amorphous carbon encapsulated Fe 3 O 4 microspheres. This encapsulation was achieved by meticulously controlling the reaction duration and glucose concentrations within the hydrothermal process. Analysis via X-ray diffraction and Raman spectroscopy confirmed that all specimens retained a homogeneous Fe 3 O 4 phase. Following encapsulation, the Fe 3 O 4 particles were uniformly distributed across the amorphous carbon spheres, with fine particle sizes in the hybrids measuring less than 20 nm. Magnetic characterization revealed that parameters such as saturation magnetization, remanent magnetization, and coercivity of the Fe 3 O 4 microspheres could be significantly adjusted by varying the hydrothermal reaction time. Notably, the hybrids exhibited a 5- to 10-fold increase in both coercivity and remanent magnetization when compared to the pristine Fe 3 O 4 microspheres. Nonetheless, the saturation magnetization of the hybrids reached up to 90% of that observed in bulk Fe 3 O 4 . These magnetic properties are predominantly influenced by the size effect associated with the nanostructured Fe 3 O 4 .
研究领域:
材料科学
·
纳米技术
·
磁学
·
无机合成
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Bo Li,Qi Zhang,Yuanfeng Pan,Yuchen Li,Zhihong Huang,Ming Li,Huining Xiao
Porous magnetic cellulose/Fe 3 O 4 beads (CFBs), consisting of cellulose as matrix and ferrosoferric oxide, were successfully fabricated from microcrystalline cellulose dissolved in an ionic liquid and further modified with glutaric anhydride. The porous structure of modified magnetic cellulose/Fe 3 O 4 beads (MCFBs) was created by nano-sized calcium carbonate (CaCO 3 ). The resulting MCFBs were well characterized and employed as effective adsorbents for removal of dyes from aqueous solution. The adsorption behaviors indicated that the adsorption kinetics was preferably fitted to the pseudo-second-order kinetic model; whereas the adsorption isotherms were well described by Langmuir model with the maximum adsorption capacity of 1186.8 and 151.8 mg/g for methylene blue (MB) and Rhodamine B (RhB), respectively. Moreover, MCFBs are magnetically separable, thus leading to a range of green-based and promising adsorbents towards organic pollutants with easy recovery.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）