APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yu Liu,Ruiqi Fu,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, EDTA-functionalized Fe 3 O 4 (Fe 3 O 4 @SiO 2 -EDTA) was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups for Pb(II) and Cu(II) removal from aqueous solutions. Fe 3 O 4 @SiO 2 -EDTA composites were characterized using SEM, TEM, EDX, FTIR, XPS, TGA and saturated magnetization techniques. Maximum Pb(II) adsorption capacity was found to be 114.94 mg g −1 with SiO 2 /EDTA molar ratio of 2.5:1. The adsorption rate was significantly fast and the equilibrium was reached within 10 min. The optimum pH was recorded to be 5.0. The maximum adsorption capacity of the studied heavy metal ions calculated by Langmuir model followed the order: Cu(II) (0.58 mmol g −1 ) > Pb(II) (0.55 mmol g −1 ) ≈ Ni(II) (0.55 mmol g −1 ) > Cd(II) (0.45 mmol g −1 ). Moreover, Pb(II) and Cu(II) adsorption capacities were not significantly affected by co-existing cations and NOM. These results suggested that this adsorbent can be considered as a promising adsorbent to remove Pb(II) and Cu(II) from wastewaters.
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Ping Fan,Jiahao Tang,Shunxin Jia,Pengbo Liu,Jintao Yang,Feng Chen,Zhengdong Fei,Mingqiang Zhong
Two nanocomposites with a hierarchical structure (GO@CuSilicate@Fe3O4 and GO@Fe3O4@CuSilicate) were fabricated in this paper. These as-synthesized nanocomposites were analyzed for their structural, compositional, and morphological features by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, and Brunauer–Emmett–Teller methods. SEM images showed that both nanocomposites had a core–shell structure, and their shells were composed of CuSilicate nanoneedle arrays. Further, their total electromagnetic shielding efficiency was measured and compared in a wide frequency range of 8–12 GHz (X-band). Because of the “antenna” role of CuSilicate nanoneedle arrays and the polarization at the interface between graphene oxide (GO) and Fe3O4, GO@Fe3O4@CuSilicate showed higher electromagnetic shielding performance than that of GO@CuSilicate@Fe3O4. With 1 mm thickness, GO@Fe3O4@CuSilicate showed a high electromagnetic shielding efficiency (over 40 dB) in the whole X-band (8.2–12.4 GHz) and reached a maximum value (41.8 dB) at 8.2 GHz. Its total electromagnetic shielding efficiency was mainly contributed by absorption rather than reflection. This study provided an idea for the structural design of high-performance electromagnetic shielding materials in the GHz frequency range (X band).
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Shi Li,Shang-Ru Zhai,Qing-Da An,Ming-Hui Li,Yu Song,Xiao-Wei Song
The preparation of Co(II) supported magnetic heterogeneous catalyst, i.e. Fe 3 O 4 @SiO 2 –NH 2 @CS–Co, and its efficient and selective catalytic properties toward the oxidation of ethylbenzene to acetophenone are presented. The materials were characterized by various physicochemical techniques such as scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometer, elemental analysis, inductively coupled plasma-atomic emission spectrometer and X-ray photoelectron spectroscopy, etc. The reaction conditions were thoroughly investigated and highly improved catalytic performance (82.5% conversion of ethylbenzene and 80.1% selectivity to acetophenone) was gained under more mild reaction conditions of lower temperature (70 °C), shorter reaction period (60 min) and cheaper and greener oxygen source (H 2 O 2 ). More importantly, it could be reused successively at least 10 times when more than 80% of its catalytic activity maintained.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Haopeng Cai,Chaochao Feng,Hongbo Xiao,Bo Cheng
Due to the pressing need for electromagnetic interference and radar stealth, microwave absorbers have garnered considerable attention. Through chemical co-precipitation and in-situ polymerization, we synthesize a ternary composite containing reduced graphene oxide , Fe 3 O 4 with flower-like nanostructures , and polyaniline (PANI). To fine-tune the impedance matching and corrosion resistance of composite materials, the conductive PANI was densely coated on the surface of reduced graphene oxide (rGO)/flower-like Fe 3 O 4 (f-Fe 3 O 4 ). The ternary composite exhibits excellent microwave absorption performance. In comparison to rGO/f-Fe 3 O 4 (1:10), which has a minimum reflection loss (RL min ) of −32.81 dB at 10.61 GHz and a 5.15 GHz effective absorption bandwidth (EAB) (7.34–12.49 GHz), rGO/f-Fe 3 O 4 (1:10)@PANI has an RL min of −46.49 dB at 9.93 GHz with a 2.5 mm thickness and an EAB of 4.25 (8.90–13.15 GHz). The results indicate that the addition of the PANI anticorrosion coating layer has no discernible effect on the final microwave absorption performance. This article also examines the effect of rGO weight ratio on microwave absorbing properties. When the rGO content is too high, the impedance will be mismatched, while the too low rGO content will affect the absorbing performance. This research work has contributed to our present understanding of the structure design and composition control of microwave absorbers.
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 11
·1-13
·
IF 2.101
Hou Yanhui,Wang Yechen,Yuan Huili,Chen Hang,Chen Guowei,Shen Junhai,Li Liangchao
Heterogeneous photo-Fenton SiO 2 /Fe 3 O 4 /C@TiO 2 (SFCT) catalyst with a core-multishell structure and a diameter of about 550 nm was successfully prepared and was characterized by scanning electron microscopy (SEM), TEM, XRD, Raman, and Fourier transform infrared (FT-IR). The results illustrated that anatase TiO 2 coexisted with rutile TiO 2 , in which the anatase phase was the main crystal phase. In addition, the catalytic activity of SFCT catalyst had been evaluated in the catalytic degradation on p-nitrophenol (PNP). The influence factors on the PNP degradation, including SFCT component ratio ( m
SFC / m
TiO2 ), H 2 O 2 dosage, solution pH, and PNP concentration, had been investigated. And the contrast experiments about the photo-Fenton catalytic mechanism revealed that the SFCT-2 catalyst possessed a superior activity in the neutral environment due to the optimal activity matching between Fe 3 O 4 and TiO 2 , and it exhibited the stable catalytic performance after five successive recycles. Therefore, the SFCT-2 catalyst had a promising application for the photo-Fenton degradation of organic contaminant.
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Advanced Materials Interfaces
·
2019
·Vol. 6
·期 21
·1901250
·
IF 4.713
Lei Li,Chao Jia,Ziqiang Shao,Jianquan Wang,Feijun Wang,Wenjun Wang,Haiyang Wang,Di Zu,Hui Wu
Transition metal oxide and heteroatoms doped carbon are promising in high performance energy storage upon complete redox reaction. Herein, nanoparticle-embedded carbon nanosheets are fabricated by a one-pot tailored thermally expansion of viscous precursors. The obtained biomass carbon exhibits ideal surface area, crystal structures, and heteroatom doping. Benefiting from the synergistic effect of the constituent components, this composite electrode reaches a high potential window of 1.1 V and delivers a good specific capacitance of 522.7 F g −1 in aqueous electrolyte. After combining with a capacitive carbon nanotubes (CNTs) film cathode, the assembled flexible solid-state supercapacitors deliver a high energy density of 18.1 Wh kg −1 at a power density of 125 W kg −1 . Moreover, in cases of frequent bending and elevated temperature (up to 80 °C), the hybrid device maintains superior electrochemical attributes. This facile and scalable process, as well as their high reversible capacity, are promising for next-generation energy-storage devices.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 7
·4417-4427
·
IF 4.036
Baoquan Jia,Dingna Liu,Chengyu Niu,Qili Yu,Jie Ren,Qingye Liu,Haiqiang Wang
The development of adsorbents by using the byproducts or waste from large-scale industrial and agricultural production is of great significance, and is considered to be an economic and efficient strategy to remove the heavy metals from polluted water. In this work, a novel chitin/EM@Fe3O4 nanocomposite hydrogel was obtained from a NaOH/urea aqueous system, where the proteins of egg shell membrane and Fe3O4 nanoparticles were chemically bonded to chitin polymer chains with the help of epichlorohydrin. Due to the existence of a large number of –NH2, –OH, –CONH–, –COOH and hemiacetal groups, the adsorption efficiency for Pb2+ into the absorbent was dramatically enhanced. The experimental results revealed that the adsorption behavior strongly depends on various factors, such as initial pH, initial Pb2+ concentration, incubation temperature and contact time. The kinetic experiments indicated that the adsorption process for Pb2+ in water solution agreed with the pseudo-second-order kinetic equation. The film diffusion or chemical reaction is the rate limiting process in the initial adsorption stage, and the adsorption of Pb2+ into the nanocomposite hydrogel can well fit the Langmuir isotherm. Thermodynamic analysis demonstrated that such adsorption behaviors were dominated by an endothermic (ΔH° > 0) and spontaneous (ΔG° < 0) process.
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TALANTA
·
2025
·
IF 6.1
Chenghao Lin,Qianyi Li,Gengliang Liu,Zixuan Xi,Xiaoxia Yan,Shijun Li,Liang He,Pengli Bai
Alzheimer’s Disease (AD), a most common neurodegenerative disease, has aroused people's great attention. Amyloid-β 1-42 (Aβ42) from serum/plasma has been listed as Core 1 biomarker in diagnostic guide and explore an ultrasensitive detection method of Aβ42 is of great significance for early AD diagnosis and treatment. Herein, an ultrasensitive fluorescent biosensor for Aβ42 detection is designed, which is composed of Fe 3 O 4 @MoS 2 microsphere and Au-Ag alloy. Compared with typical single gold nanoparticles in traditional fluorescent biosensor, alloy nanoparticles can generate a stronger electromagnetic field to enhance the fluorescence of quantum dots via surface plasmon resonance, achieve the effect of signal amplification. Importantly, our design significantly improved the limit of detection to 11 ag/mL, with a linear response ranging from 0.1 to 10 4 fg/mL. Moreover, by replacing the detection antibody in the biosensor, it can also be applied to other common AD biomarkers, such as Aβ40 (linear range: 0.1 to 10 5 fg/mL, LOD: 61 ag/mL) and total Tau protein (linear range: 0.1 to 10 5 fg/mL, LOD: 40 ag/mL). The biosensor exhibited excellent performance in both spiked and real serum samples. This fluorescent biosensor based on Au-Ag alloy strategy with ultra-sensitivity and good selectivity, provides a reliable solution for AD’s early diagnosis.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fanpeng Ran,Yulin Zou,Yixuan Xu,Xiaoyan Liu,Haixia Zhang
A kind of core-shell material with regular shape and size, and uniform composition, is prepared in aqueous phase and used for laccase immobilization. Magnetic Fe 3 O 4 nanoparticle is coated with MoS 2 by self-assembly, and the Fe 3 O 4 @MoS 2 is further coated by polyethyleneimine, which acts as a spacer arm and is beneficial to enzyme immobilization. The nanocarrier affords the high loading capability of 120 mg/g and satisfied activity recovery of 90% for laccase. The immobilized laccase is stable in a wider range of pH (3–10), temperature (20–70 °C) and storage time (1–14 days), as well as having the recyclability (1–10 cycles). The carcinogenic persistent organic pollutants (malachite green, bisphenol A, bisphenol F) in the water are degraded by the immobilized laccase with a higher efficiency (82.7%, 87.6%, 70.6%) than free laccase (14.4%, 85.0%, 48.0%), respectively. It is prospected that the constructed material is qualified as green nanoreactor for biological macromolecules immobilization.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Wenlong Li,Ludan Shang,Dafei You,Hao Li,Han Wang,Lijuan Ma,Xinna Wang,Yanwei Li,Yanhui Li
In this paper, we synthesized a core-shell structured Fe 3 O 4 @Ti-PDA nanoparticles as photocatalyst by a facile method in environmental friend mild reaction conditions without organic solvent . Firstly, Fe 3 O 4 was synthesized by solvothermal method, and Fe 3 O 4 @PDA was formed by dopamine (DA) self-polymerization to encapsulate Fe 3 O 4 to form polydopamine (PDA) lager. Then, the surface of Fe 3 O 4 @PDA was wrapped by coordinating bis(2-hydroxypropionic acid) diammonium dihydroxide(Ti-BALDH) with DA combined DA self-polymerizing to obtain Fe 3 O 4 @Ti-PDA. As control, we synthesized another photocatalyst Fe 3 O 4 @PDA@TiO 2 . Compared with Fe 3 O 4 @PDA@TiO 2 (band gap 3.0 eV), Fe 3 O 4 @Ti-PDA had a narrower band gap (2.5 eV) and a wider light absorption range (from ultraviolet to visible light to near-infrared light), as a photocatalyst, which can make full use of sunlight to improve photocatalytic efficiency. Meanwhile, magnetic core of Fe 3 O 4 @Ti-PDA made it was easy to separate from aqueous solution for convenient recovery. Using methylene blue (MB) as model pollutant, the degradation efficiency of Fe 3 O 4 @Ti-PDA on MB reached to 92.4% under visible light irradiation for 120 min without cocatalyst, while for Fe 3 O 4 @PDA@TiO 2 only to 32.5%. The result indicated Fe 3 O 4 @Ti-PDA enabled photocatalytic oxidation and rapid separation when photogenerated electron-hole pairs were generated. After three recycles, the degradation efficiency of Fe 3 O 4 @Ti-PDA on MB still remained at 86.47%, showing good recycle stability.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 70
·56974-56981
·
IF 3.84
Songfang Zhao,Yongju Gao,Jinhui Li,Guoping Zhang,Rong Sun,Ching-Ping Wong
A novel protocol to prepare multifunctional magnetic organic–inorganic nanostructured catalysts of Fe3O4@organosilicon/Ag with tailored properties is developed. Such nanostructure design endows the catalysts with superparamagnetism (11.6 emu g−1), excellent oxidation resistance, and catalytic activity. Fe3O4 nanoparticles (NPs) are encapsulated with porous organosilicon via improved self-assembly of a flexible-bridged organosilicon precursor without templates. Subsequently, dispersed Ag NPs are in situ grown on the porous microparticles via a silver mirror reaction. The as-prepared multifunctional catalysts are characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, a vibration sample magnetometer, X-ray diffraction, thermal gravimetric analysis, and nitrogen adsorption and desorption, respectively. The resultant hybrid microparticles possess micro- and nano-pores, and exhibit a small hysteresis loop and low coercivity. Meaningfully, they exhibit exceptional catalytic performance for the reduction of 4-nitrophenol in the presence of sodium borohydride and could be reused at least 9 times with excellent stability by means of convenient magnetic separation. The catalysts could be employed to reduce other dyes such as methylene blue, orange G and rhodamine B, and their corresponding reductions follow pseudo-first-order reactions. Therefore, the proposed structure design and scalable route for the synthesis of hierarchical catalysts can pave the way for synthesizing other catalyst systems to address the diverse reaction demands.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Na Li,Zhenyuan Ji,Lizhi Chen,Xiaoping Shen,Yifei Zhang,Shiqing Cheng,Hu Zhou
In this study, highly dispersed Ag nanoparticles anchored on Fe 3 O 4 modified polydopamine sub-micrometer spheres (PSS) nanocomposites were fabricated by a facile two-step approach. The catalytic properties of the as-obtained PSS/Fe 3 O 4 /Ag ternary nanocomposites were evaluated with the reduction of 4-nitrophenol by NaBH 4 as a model reaction. It is shown that the presence of Fe 3 O 4 can significantly decrease the particle size of the in-situ formed Ag nanoparticles on PSS, and optimize the catalytic performance of PSS/Ag nanocomposites. Additionally, the as-synthesized PSS/Fe 3 O 4 /Ag ternary nanocomposites exhibit high catalytic stability for recycle. Magnetic study reveals that the ternary nanocomposites display room-temperature superparamagnetic behavior. It is believed that this simple and effective method can be extended for the preparation of other polydopamine-based multicomponent nanocomposites with intriguing property, which would hold great promise for a variety of applications.
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