JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Hong DING,Yanling ZHAO,Qianlin DUAN,Junwen WANG,Kan ZHANG,Guangyue DING,Xianmei XIE,Chuanmin DING
Fe 3 O 4 @SiO 2 magnetic nanoparticles functionalized with mesoporous cerium oxide (Fe 3 O 4 @SiO 2 @ m CeO 2 ) was fabricated as a novel adsorbent to remove phosphate from water. The prepared adsorbent was characterized by X-ray diffractometry (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption and vibrating sample magnetometry (VSM), and its phosphate removal performance was investigated through the batch adsorption studies. Characterization results confirmed that mesoporous cerium oxide was successfully assembled on the surface of Fe 3 O 4 @SiO 2 nanoparticles, and the synthesized adsorbent possessed a typical core-shell structure with a BET surface area of 195 m 2 /g, accessible mesopores of 2.6 nm, and the saturation magnetization of 21.11 emu/g. The newly developed adsorbent had an excellent performance in adsorbing phosphate, and its maximum adsorption capacity calculated from the Langmuir model was 64.07 mg/g. The adsorption was fast, and the kinetic data could be best fitted with the pseudo-second-order kinetic model. The phosphate removal decreased with the increase of solution pH (2 to 10), while the higher ionic strength slightly promoted the phosphate adsorption. The presence of Cl − and SO 4 2− could enhance the adsorption of phosphate whereas HCO 3 − had interfering effect on the phosphate adsorption. The adsorption mechanism was studied by analyzing Zeta potential and FTIR spectroscopy, and the results indicated that the replacement of the surface hydroxyl groups by phosphate ions with the formation of inner-sphere complex played a key role in the phosphate adsorption. The spent adsorbent could be quickly separated from aqueous solution with the assistance of the external magnetic field, and the adsorbed phosphate could be effectively desorbed using a 1 mol/L NaOH solution.
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
Materials
·
2022
·Vol. 16
·期 1
·387
·
IF 3.748
Kezhu Xu,Qunling Fang,Jing Wang,Ailing Hui,Shouhu Xuan
Due to the abuse of antibiotics, the sensitivity of patients to antibiotics is gradually reduced. This work develops a Fe3O4@SiO2@Au/PDA nanochain which shows an interesting magnetic-field-induced improvement of its photothermal antibacterial property. First, SiO2was wrapped on Fe3O4nanospheres assembled in a chain to form a Fe3O4@SiO2nanocomposite with a chain-like nanostructure. Then, the magnetic Fe3O4@SiO2@Au/PDA nanochains were prepared using in situ redox-oxidization polymerization. Under the irradiation of an 808 nm NIR laser, the temperature rise of the Fe3O4@SiO2@Au/PDA nanochain dispersion was obvious, indicating that they possessed a good photothermal effect. Originating from the Fe3O4, the Fe3O4@SiO2@Au/PDA nanochain showed a typical soft magnetic behavior. Both the NIR and magnetic field affected the antimicrobial performance of the Fe3O4@SiO2@Au/PDA nanochains.Escherichia coliandStaphylococcus aureuswere used as models to verify the antibacterial properties. The experimental results showed that the Fe3O4@SiO2@Au/PDA nanochains exhibited good antibacterial properties under photothermal conditions. After applying a magnetic field, the bactericidal effect was further significantly enhanced. The above results show that the material has a broad application prospect in inhibiting the growth of bacteria.
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10352-10358
·
IF 3.288
Danlin Bu,Na Li,Yu Zhou,Hengyu Feng,Fei Yu,Chunxia Cheng,Ming Li,Linghan Xiao,Yuhui Ao
N-Halamine-based antibacterial materials are widely used due to their excellent characteristics. However, the N–Cl bonds in N-halamine-based materials are not stable under UV light irradiation so that they are difficult to recover and reuse. Here, a kind of N-halamine-immobilized Fe3O4@SiO2@TiO2(F@S@T-Cl) nanoparticles were prepared. In addition, the UV stability and regeneration capacity were also studied after variable time exposure to UV light. The results showed that nanoparticles have great antibacterial properties against Staphylococcus aureus and Escherichia coli. Meanwhile, the N–Cl bond in the nanocomposite showed outstanding storage stability under UV light irradiation and good regeneration ability; the material can realize cyclic utilization and solve the problem of secondary pollution of the antibacterial material. It provides a broader application prospect for the recyclable N-halamine antibacterial material.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Haijiao Jia,Xinyu Xu,Yuchen Cui,Mengqi Cheng,Guirong Borjihan,Xiao Zhang,Shengbo Yang,Youxin Li
A novel magnetic heterogeneous ruthenium catalyst (Fe 3 O 4 @SiO 2 -DTPA-Ru) was prepared by using magnetic silicon spheres as support, ethylenediaminepentaacetic acid (DTPA) as functional ligands, ruthenium chloride as catalyst precursor. The results obtained after a series of characterizations showed that the catalyst Fe 3 O 4 @SiO 2 -DTPA-Ru was 5–15 nm in size with a 0.205 nm lattice and contained 0.31 mmol Ru/g catalyst. It also had a good thermal stability under 232°C which was verified by thermal filtration method. Besides, the saturation magnetic intensity was as high as 20.54 emu/g. The catalyst Fe 3 O 4 @SiO 2 -DTPA-Ru was applied for the first time into thirteen oxidation reactions of aromatic alcohols and showed good catalytic activity even the yields of eleven aromatic alcohols were all over 90%. In catalyzing 1-phenylethanol to acetophenone, its TOF and TON were 9677 h −1 and 6991, respectively. The Fe 3 O 4 @SiO 2 -DTPA-Ru catalyst could still maintain good reusability and catalytic performance after 15 cycles of 1-phenylethanol oxidation, which was superior to many reported catalysts and had great potential in future industrial production.
研究领域:
化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 7
·1700117
·
IF 4.474
Yanning Qu,Renliang Huang,Wei Qi,Qi Qu,Rongxin Su,Zhimin He
Encapsulation of enzymes with enhanced activity and recyclability in water-in-oil Pickering emulsions is a simple and efficient method for their immobilization; however, the effect produced by the structure of colloidal particles on the stabilization of the Pickering emulsion for enzyme catalysis has not been investigated in detail. In this study, four types of hydrophobic Fe 3 O 4 @SiO 2 nanoparticles (NPs) with similar chemical compositions, particle diameters, but different surface characteristics have been prepared and utilized for enzyme encapsulation in various water-in-oil magnetic Pickering emulsions, after which the relationship between NPs structure, size of emulsions droplets, and enzyme activity is examined. The obtained results indicate that (i) the more hydrophobic Fe 3 O 4 @SiO 2 NPs cause the higher enzyme activity; (ii) the higher hydrophobicity of oil phase also increases the enzyme activity, especially for Fe 3 O 4 @w-SiO 2 NPs which form in the solvent of water. The results are mainly attributed to the higher specific surface area of emulsion droplets and interfacial mass transfer of substrates through the interfaces of droplets. The reported data provide new insights into the mechanism of stabilization of Pickering emulsions for enhancing enzyme activity and demonstrate efficient theoretical references for enzyme immobilization and synthesis of stable and active biocatalysts with high recyclability.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 12
·1816-1824
·
IF 1.158
Qin Huihao,Zhang Wei,Luo Yi,Wei Yubo,Sun Shenglu,Chen Jingya
Polylactic acid glycolic acid (PLGA), a polymer material, is used as a shell and perfluorooctane (PFOB) as the core. Fe3O4@SiO2 nanoparticles are distributed in the shell to prepare a magnetic phase change multifunctional nano emulsion contrast agent
(Fe3O4@SiO2/PLGA/PFOB). The ultrasound, magnetic resonance imaging and CT imaging effects of the contrast agent on normal rat liver parenchyma are investigated. Methods: Single emulsification method is used to prepare Fe3O4@SiO2-loaded
polymer Fe3O4@SiO2/PLGA/PFOB nanoparticles encapsulated with PLGA. In addition, polymer Fe3O4@SiO2/PLGA nanoparticles loaded with Fe3O4@SiO2 nanoparticles, PLGA@PFOB nanoparticles coated with
PLGA and blank PLGA nanoparticles are prepared as experimental control group. Its surface morphology, internal structure, particle size, potential and other general characteristics are tested. RAW264.7 mouse mononuclear macrophages are cultured in vitro. Prussian blue staining is used
to observe macrophage phagocytosis after Fe3O4@SiO2/PLGA/PFOB contrast agent is added to incubate for 3 hours. MTT method is used to detect the effect of contrast agent on cell activity. The macrophage suspension engulfed with Fe3O4-PFOB
is examined by ultrasound, magnetic resonance and CT. The results showed that Fe3O4@SiO2/PLGA/PFOB is brown emulsion after being dissolved in double distilled water. Under the light microscope and scanning electron microscope, Fe3O4@SiO2/PLGA/PFOB
is spherical, with regular shape, uniform size, good dispersity and smooth surface. Macrophages are dependent on the phagocytosis of the contrast medium without affecting the activity of macrophages. Moreover, in vitro imaging experiments, compared with the control group, macrophages
phagocytized by Fe3O4@SiO2/PLGA/PFOB have obvious enhancement effects in ultrasound, magnetic resonance and CT imaging. In conclusion, Fe3O4@SiO2/PLGA/PFOB has good stability in vivo, can be engulfed by liver macrophages,
and can enhance ultrasound, magnetic resonance and CT imaging of liver parenchyma. It is a safe and effective multifunctional ultrasound contrast agent.
研究领域:
医学影像学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45920-45929
·
IF 3.708
Lisha Tan,Jiang Xu,Xiaoqin Xue,Zimo Lou,Jin Zhu,Shams Ali Baig,Xinhua Xu
Silica-coated magnetite (Fe3O4@SiO2) nanoparticles functionalized with amino, imino and sulfonic groups (Fe3O4@SiO2–mPD/SP) were successfully synthesized via a facile chemical oxidative polymerization of m-phenylenediamine (mPD) and m-sulfophenylenediamine-4-sulfonic acid (SP) monomers, and utilized for selective removal of Pb(II) and Cr(VI) from aqueous solutions. It was revealed by the characterizations that the polymers formed on Fe3O4@SiO2 nanoparticles were the true copolymers with a mPD–SP unit, rather than a mixture of mPD and SP homopolymers. Fe3O4@SiO2–mPD/SP nanocomposites could be easily separated from aqueous solutions within 30 s. The maximum adsorption capacities of Pb(II) (83.23 mg g−1) and Cr(VI) (119.06 mg g−1) on Fe3O4@SiO2–mPD/SP nanocomposites were obtained at the mPD/SP molar ratios of 95 : 5 and 50 : 50, respectively. Moreover, satisfactory selective removal of Pb(II) and Cr(VI) from their mixtures with Cu(II) and Ni(II) ions were exhibited by the Fe3O4@SiO2–mPD/SP (95 : 5) and Fe3O4@SiO2–mPD/SP (50 : 50), respectively. The Pb(II) adsorption equilibrium was reached within 5 min by Fe3O4@SiO2–mPD/SP (95 : 5). The adsorption data of Pb(II) and Cr(VI) were both fitted well to the Freundlich isotherm and followed the pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) and Cr(VI) on Fe3O4@SiO2–mPD/SP nanocomposites included five processes, namely: ion-exchange, complexation adsorption, reduction reaction, electrostatic attraction and physical adsorption. The enhanced adsorption performance of nanoparticle-based magnetic adsorbents for selective removal of heavy metal ions can be achieved with such a copolymerization strategy.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2012
·Vol. 64
·期 2
·347-357
·
IF 1.632
Zhang Jian-Ming,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Tian Ge
Multifunctional nanomaterials with task-specific physicochemical properties, especially core–shell nanostructures with Fe 3 O 4 core and NH 2 -functional shells (Fe 3 O 4 @SiO 2 –NH 2 ), have been extensively investigated as high-performance adsorbents, catalysts and catalyst supports; and in most cases the controllable sol–gel technique is the choice for fabrication of this kind of widely applied materials. Herein, we demonstrated that mono-dispersed and spherical Fe 3 O 4 @SiO 2 –NH 2 nanomaterials with magnetic response core, NH 2 -functional shell structure can be facilely prepared by co-condensation of TEOS with APTMS using a versatile sol–gel process. It was shown that the proper usage of APTMS and appropriate pre-hydrolysis time of TEOS were crucial and key steps for formation of highly uniform and desirable amino loading Fe 3 O 4 @SiO 2 –NH 2 materials. The TEOS pre-hydrolysis and the critical time (around 90 min) before the addition of APTMS prove to be vital for uniform structure evolution, while the appropriate concentration of APTMS (~2.28 mmol L −1 in our system) leads to well-dispersed materials with relatively high loading of amino functionality. The as-prepared Fe 3 O 4 @SiO 2 –NH 2 magnetic nanoparticles prepared under optimum conditions possessing superparamagnetic behavior, uniform core–shell structure (~200 nm in diameter), relatively large BET surface area (~138 m 2 /g) and high incorporation of amino-functionality (~2.90 wt %).
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Qingqian Fan,Yueping Guan,Zhi Zhang,Guoli Xu,Yu Yang,Chen Guo
A new method was developed for preparing monodisperse Fe 3 O 4 @SiO 2 magnetic core-shell nanoparticles via three steps. The obtained nanoparticles exhibit high saturation magnetization, good surface topography and dispersion as characterized by FTIR, SEM and VSM. The experimental results of hydrochloric acid treatment show that the obtained nanoparticles have excellent acid resistance and stable and compact silicon coating. The magnetic core-shell nanoparticles were further tested for purification of plasmid DNA from E. coli DH5a cells. The result of purification leaded to better adsorption, elution and purity results in comparison with isolated commercial extraction kit.
研究领域:
生物技术
·
材料科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Maosai Zhang,Ye Yang,Wenchuan Guo
In this work, a simple electrochemical sensing platform based on acid-treated Fe 3 O 4 @SiO 2 nanoparticles was successfully prepared for nitrite and sulfite detection. Fe 3 O 4 @SiO 2 nanoparticles were synthesized through the sol–gel and hydrothermal methods. Fe 3 O 4 @SiO 2 presented positive charges after acid treatment, which could enhance the electrostatic attraction between Fe 3 O 4 @SiO 2 and nitrite and sulfite. The Fe 3 O 4 @SiO 2 (acid-treated) modified magnetic glassy carbon electrode (MGCE) was applied to detect nitrite and sulfite using differential pulse voltammetry and cyclic voltammetry. Under optimized conditions, the developed electrochemical sensor presented good analytical properties for nitrite and sulfite detection with detection limits of 3.33 μmol/L and 31.57 μmol/L, respectively. The good recoveries varied from 85.18% to 111.02%, with a relative standard deviation of 0.23–4.80%. Furthermore, the Fe 3 O 4 @SiO 2 (acid-treated) modified MGCE showed better selectivity, reproducibility, and repeatability in nitrite and sulfite detection. Therefore, this proposed electrochemical sensor provides a new method for developing a nitrite and sulfite detection sensor.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 19
·9693-9700
·
IF 3.708
Jian Zou,Yun-Gui Peng,Yi-You Tang
Monodisperse Fe3O4@SiO2 nanoparticles are prepared using hydrazine as a catalyst via a biphase approach without any alcohols or surfactants. Fe3O4 seeds can be dispersed well in this system. The sizes of Fe3O4@SiO2 nanoparticles with a single core could be regulated from 20 nm to 50 nm corresponding to SiO2 shell thickness from 3 nm to 17 nm. Core-free SiO2 nanoparticles are not observed in this system. The coating process can be implemented at a temperature greater than 90 °C, which results in a short coating duration from 2 h to 8 h for different shell thicknesses. Hydrazine can prevent the Fe3O4 core from oxidization during coating at this temperature. Fe3O4@SiO2 nanoparticles have high chemical stability and magnetic saturation. A plausible formation mechanism of these nanoparticles is also presented.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
Yaohui Xu,Yang Zhou,Wenhui Ma,Shixing Wang
The magnetic Fe3O4@SiO2 nanoparticles (NPs) functionalized with 8-chloroacetylaminoquinoline as a fluorescent sensor for detection and removal of Zn2+ have been synthesized. The core-shell structures of the nanoparticles and chemical composition have been confirmed by TEM, XRD, FTIR, and XPS techniques. The addition of functionalized Fe3O4@SiO2 NPs into the acetonitrile solution of Zn2+ had an effect of visual color change as well as significant fluorescent enhancement. High-saturated magnetizations (24.7 emu/g) of functionalized Fe3O4@SiO2 NPs could help to separate the metal ions from the aqueous solution. The magnetic sensor exhibited high removal efficiency towards Zn2+ (92.37%). In this work, we provided an easy and efficient route to detect Zn2+ and simultaneously remove Zn2+.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）