Journal of Physical Chemistry C
·
2012
·
IF 4.805
Qiao An,Meng Yu,Yuting Zhang,Wanfu Ma,Jia Guo,Changchun Wang
The heterostructure Ag–Au bimetallic nanocrystals supported on Fe3O4@carbon composite microspheres were synthesized by one facile and controllable approach, wherein the Ag nanocrystals attached on the Fe3O4@carbon microspheres were prepared first and served as reductant for the galvanic replacement reaction with the Au precursor (HAuCl4). Upon varying the feeding amounts of the Au precursor, the bimetallic compositions on the Fe3O4@carbon microsphere could be readily tuned resulting in a series of composite microspheres with different Au-to-Ag molar ratios. Subsequently, we thus investigated the catalytic activity and selectivity of the magnetic composite catalysts from two sides. First, 4-nitrophenol (4-NP) was applied as a model molecule to study the effect of different Au-to-Ag molar ratios on catalytic capabilities of the resulting composite microspheres. It was found that upon the addition of NaBH4 the catalytic capability was markedly enhanced when the Au content was increased. The maximum activity parameter value reached 1580 s–1 g–1, which is far higher than those of known monometallic composites. Also, they could give the equally high yields for other nitroaromatic compounds with various substituents, irrespective of the linked electron-donating or electron-withdrawing groups. Second, the synergistic effects of the carbon substrate in the catalysis reaction were demonstrated. When compared with colloidal SiO2, TiO2, and poly(styrene-co-acrylic acid) substrates, the carbon support not only facilitated the enhancement of the catalytic performance of the noble metal nanocrystals but was also more suitable for the in situ preparation of Au–Ag bimetallic nanocrystals using the GRR. Besides, the particles’ convenience in terms of their magnetic separability and outstanding reusability was validated through many successive reduction reaction cycles. In light of these unique characteristics, the Fe3O4@C@Ag–Au composite microspheres show promising and great potential for practical applications.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 7
·期 2
·210-223
·
IF 4.776
Madiha Saeed,M. Zubair Iqbal,Wenzhi Ren,Yuanzhi Xia,Waheed S. Khan,Aiguo Wu
The development of a simplified theranostic system with high-efficiency for multifunctional imaging-guided photodynamic therapy/photothermal therapy (PDT/PTT) is a great challenge. Therefore, a versatile fabrication strategy was introduced to design new Fe3O4-black TiO2 nanocomposites (Fe–Ti NCs). The Fe–Ti NCs exhibit an intense broad light absorption, high photothermal conversion efficiency, inherited phototherapy, and favorable magnetic resonance imaging (MRI) properties. The in vitro results demonstrate synergistic PTT and PDT capability of Fe–Ti NCs under 808 nm irradiation at low concentration and power density. Fe–Ti NCs also show superior phototherapy performance (PTT/PDT) under 671 nm laser irradiation. The confocal microscopy analysis demonstrates reactive oxygen species (ROS)-mediated synergistic phototherapy. Hematological and histological analysis confirms no evident toxicity of Fe–Ti NCs. The in vivo photoinduced tumor ablation capability of Fe–Ti NCs was assessed and monitored, and a rapid increase in temperature (60 ± 2 °C) after being exposed to 808 nm laser at 0.7 W cm−2 for 5 min was observed. Then, the same change in temperature is observed under 671 nm laser at 0.5 W cm−2. Thus, in vitro and in vivo dual-wavelength laser tumor ablation ability of Fe–Ti NCs verified excellent synergistic phototherapy efficacy against tumors. Moreover, Fe–Ti NCs exhibit superparamagnetic behavior, high magnetization value (48 emu g−1), good r2 relaxivity value (38.2 mM−1 s−1), and excellent T2 imaging capability to monitor therapeutic performance.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
·
影像医学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jie-Ping Fan,Bing Zheng,Yu Qin,Dan Yang,Dan-Dan Liao,Xiao-Kang Xu,Xue-Hong Zhang,Jian-Hang Zhu
In this work, a superparamagnetic Fe 3 O 4 -graphene oxide (MGO) nanocomposite was prepared by one-step chemical co-precipitation method, and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), powder X-ray diffraction (PXRD), Raman spectroscopy and nitrogen adsorption–desorption curve. The as-prepared MGO was used to adsorb nuciferine, and the adsorption kinetic, isotherm and reusability of MGO were also investigated. The results showed that the adsorption of nuciferine on MGO reached its equilibrium very quickly (within 10 min) due to the two-dimensional carbon nanostructure of GO. In comparison with MGO, five conventional sorbents, i.e., macroporous resin D-101, silica gel, reverse phase silica gel (RP-C18) and cation exchange resin and polyamide, were also used to evaluate their adsorption capabilities. Therefore, MGO combined the advantages of both superparamagnetic particle and GO, i.e., easy separation and high absorption capacity. Finally, MGO was successfully applied to enrichment and separation of nuciferine in the extract of Nelumbinis Folium (Lotus leaf).
研究领域:
材料科学
·
植物化学
·
药用植物研究
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 17
·3801-3810
·
IF 3.286
Huang Yuanlin,Liang Guangzhao,Lin Tianran,Hou Li,Ye Fanggui,Zhao Shulin
The convenience of colorimetric sensors is useful for practical applications. In this work, we constructed a novel colorimetric sensor with magnetic separation ability that can be operated in nearly neutral conditions and achieve one-step detection of metabolites. Magnetic Cu doped Fe 3 O 4 @FeOOH magnetic nanocomposite (Cu/Fe 3 O 4 @FeOOH) with an oxygen vacancy was prepared by a one-step self-assembly hydrothermal method, and fully characterized by different methods. The oxygen vacancy generated by the incorporation of Cu 2+ cations into the Fe 3 O 4 @FeOOH structure was confirmed to be a vital reactive site for enhancing the catalytic activity, which opens up a new way of designing highly efficient enzyme mimics. Benefiting from its inherent horseradish-peroxidase-like activity, a simple and selective enzyme-based colorimetric sensor was developed for one-step detection of H 2 O 2 and cholesterol, and 3,3′,5,5′-tetramethylbenzidine was catalyzed by H 2 O 2 to generate a colored product of oxidized 3,3′,5,5′-tetramethylbenzidine for signaling. H 2 O 2 and cholesterol can be linearly detected in the same range from 0.01 to 0.4 mmol L -1 with detection limits of 0.0075 mmol L -1 and 0.0082 mmol L -1 , respectively. The proposed colorimetric sensor has satisfactory reusability, accuracy, and practicability in human serum samples, indicating its potential application for the detection of different metabolites in the fields of life science and analytical science.
Graphical abstract
研究领域:
分析化学
·
生物传感
·
材料科学
·
生命科学
✓ 已验证
DOI
PubMed
高影响因子
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.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Jinhao Gao,Wenqiang Chen,Huaqiang Shi,Zhijian Li,Liming Jing,Chen Hou,Jianzhi Wang,Yang Wang
Co 3 O 4 @Fe 3 O 4 /cellulose membrane was synthesized by coating rod-like MOF-derived Fe 3 O 4 with Co 3 O 4 nanoparticles and blending with cellulose solution, further applied in the visible light-driven photo-Fenton system for perfluorooctanoic acid (PFOA) degradation. In the H 2 O 2 /membrane/visible light system, the Electron paramagnetic resonance (EPR) analysis and scavenger experiment results suggested that PFOA degradation was a co-dependent mechanism via photogenerated electrons, photogenerated holes ( h + ) and various radical species, rather than a single active constituent. Co 3 O 4 @Fe 3 O 4 /cellulose membrane showed outstanding degradation performance, stability and recyclability under optimal conditions. Compared with pure Fe 3 O 4 or Co 3 O 4 nanoparticles , the Co 3 O 4 @Fe 3 O 4 /cellulose membrane can degrade around 94.5% PFOA within 180 min in reaction system, and the leached Fe and Co was only 0.05 and 0.49 ppm, respectively. Moreover, Co 3 O 4 @Fe 3 O 4 /cellulose was reused by rinsing with ultra-pure water and the degradation capacity was still 80.4% after five cycles. The degradation pathway of PFOA also was proposed based on UHPLC-MS analysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Haoran Cheng,Shengnan Wei,Youxin Ji,Jinsheng Zhai,Xiaoli Zhang,Jingbo Chen,Changyu Shen
Flexible Poly (vinylidene fluoride) (PVDF)/Fe 3 O 4 /carbon films were prepared through the solution processing and compression molding method. The electrical conductivity and the electromagnetic interference (EMI) shielding properties of these composites were gradually increased with the increasing of CNTs or GNPs content, as well as the film thickness. Total shielding of the 8 wt% CNTs (Carbon Nanotubes) and GNPs (Graphenes) filled PVDF/Fe 3 O 4 composites increased from 14.1 to 32.7 dB, and 16.2 to 35.6 dB, while the film thickness was increased from 0.5 to 1.1 mm, respectively. Due to the synergetic effect of Fe 3 O 4 nanoparticles and CNTs or GNPs, the final EMI shielding of the composites could be mainly attributed to the absorption process. Moreover, the fabricated films possess higher thermal conductivities , which can convert microwave energy into Joule heating systems. These functional films have the potential usage in making high-efficiency EMI shielding devices with rapid heat dissipation.
研究领域:
材料科学
·
电磁学
·
热传导
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7469-7479
·
IF 1.134
Ji Dongliang,Zhang Meixing,Geng Xinxiang,Zha Zhenxing,Li Ying,Yang Jing,Cui Shihai
The graphitic carbon nitride (g-C3N4) and the Fe3O4/g-C3N4 magnetic materials were synthesized in this paper. The structures of the materials were confirmed by a series of analysis. The Fe3O4/g-C3N4
was then used as a sorbent to adsorb polychlorinated diphenyl ethers and polychlorinated biphenyls. Different extraction conditions were examined, including adsorbent amount, salinity, pH of the sample matrix, adsorption time, reaction temperature, elution solvent and preconcentration factor.
The maximum recoveries were obtained by employing methanol to desorb pollutants on 40.0 mg Fe3O4/g-C3N4 in 120.0 mL environmental water with a salinity of 5% (w/v) at a pH of 7 at 25 °C within 10 min. Using the optimized parameters, the detection
limits of the method are between 0.01 and 0.04 μ · L−1 with a satisfying linear relationship. The adsorbent can be recycled at least 10 times with no significant reduction in the extraction efficiency.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Qi Liu,Yusong Zhang,Xuesong Zhao,Hang Ye,Dan Luo
Nanoparticles (NPs) could enhance the stability of foam to allow recovery of greater amounts of residual oil during foam flooding . However, conventional nanoparticles are non-recyclable and affect the quality of the produced oil. Magnetic nanoparticles could respond to magnetic field and be recycled for reuse, thus reducing the cost for enhanced oil recovery (EOR) process and improving the quality of the produced oil. In this study, Fe 3 O 4 nanoparticles were used as foam stabilizer. The Fe 3 O 4 nanoparticles were modified with tetraethyl orthosilicate (TEOS) and n -dodecyltrimethoxysilane (WD-10) to make them hydrophobic. The optimal nanoparticles were Fe 3 O 4 @SiO 2 -700 with a contact angle of 68.5°. Foam was generated by sodium dodecyl sulphate (SDS) surfactant and the longest drainage half-life time was 746 s in the 1 wt% NPs+0.23 wt% SDS+3 wt% NaCl foam system . After evaluating foam stability, the nanoparticles were recycled and reused to stabilize foam again, and the results indicated that recycling nanoparticles three times was optimal. Finally, the core flooding experiments showed that the nanoparticles stabilized foam EOR rate was 17.4% and the system obtained a greater pressure drop to improved sweep area. These results indicated that the magnetic nanoparticles could stabilize foam effectively and could be recycled by magnetic field to reuse in stabilizing foam. This study suggested directions for further studies concerned with the application of magnetic nanoparticles for enhanced oil recovery .
研究领域:
石油工程
·
纳米技术
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Weimin Chen,Renjian Deng,Yilin Chen,Chuang Wang,Baolin Hou,Saijun Zhou,Andrew Hursthouse
Arsenic and antimony removal technology have received significant attention due to their considerable danger to aquatic ecosystems. In this study, we designed HCO–(Fe 3 O 4 ) x adsorbents with substantial functional groups, ample pore spaces, and considerable surface area , specially tailored for the simultaneous adsorption of pentavalent arsenic (As( V )) and pentavalent antimony (Sb(V)). The adsorption performance of HCO–(Fe 3 O 4 ) x was subjected variably to the Ce/Fe molar ratio (CFMR), solution pH, and co-existing anions (SO 4 2− , PO 4 3− , SiO 3 2− ). The affinity order of As(V) and Sb(V) onto HCO–(Fe 3 O 4 ) x in binary systems was pH-dependent. At a pH of 2.0, Sb( V ) exhibited stronger adsorption than As(V), whereas the opposite trend occurred at pH levels above 4.0. Analysis of the kinetic data revealed the pseudo-second-order kinetic model was the most appropriate, indicating that chemical adsorption was the predominant mechanism. Notably, the formation of inner-sphere complexes led to a higher adsorption rate for As( V ) compared to Sb(V), attributed to a lower energy barrier of 0.863 eV, facilitating the breakdown of the Fe O bond in As(V)'s asymmetric tetrahedral structure. Various analyses (FTIR, XRD, and XPS) demonstrated that adsorption mechanisms involved multiple processes like hydrogen bonding , ligand exchange, electrostatic attraction, and complexation. The primary contributions for the adsorption of As( V ) and Sb(V) were the inner-sphere complex of cerium , oxygen and arsenic atoms (Ce O As) and the outer-sphere complex of iron, oxygen and antimony atoms (Fe O Sb), respectively, indicating significant differences in the mechanisms. These findings underscored the potential of HCO–(Fe 3 O 4 ) x in mitigating As( V ) and Sb(V) water pollution, emphasizing its considerable promise as an effective remediation agent.
研究领域:
环境化学
·
水污染治理
·
吸附科学
·
环境功能材料
·
重金属去除
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2011
·
IF 4.524
Maiyong Zhu,Guowang Diao
An efficient magnetic carbon nanocomposite supported Pd nanoparticle catalyst has been prepared by a three-step process in this report. The morphology, inner structure, and magnetic properties of all products were studied with transmission electron microscopy, X-ray powder diffraction, Fourier translation infrared spectroscopy, X-ray photoelectron spectroscopy, and vibrating sample magnetometer. The Suzuki and Heck coupling reactions were used to demonstrate the catalytic efficiency of the as-prepared Pd/Fe3O4@C (Pd/MFC) nanocomposite catalyst. The results showed that the catalyst is completely recoverable with the simple application of an external magnetic field and the catalytic efficiency shows no obvious loss for Suzuki and Heck coupling reactions even after five repeated cycles.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2021
·Vol. 53
·期 2
·211-221
·
IF 3.133
Nan Jia,Yinran Xiong,Ying Wang,Siqian Lu,Ruoqiu Zhang,Yan Kang,Yiping Du
A label-free and novel surface-enhanced Raman scattering (SERS) method has been studied to rapidly detect common fish pathogenic bacteria ( Escherichia coli , Vibrio anguillarum , Vibrio harveyi , Edwardsiella piscicida , and Pseudomonas plecoglossicida ). The marriage of magnetic nanospheres (Fe 3 O 4 ) with polyethylenimine (PEI) could trigger surface charge modifications of Fe 3 O 4 , making it effective to capture negatively charged bacteria. After the rapid bacterial capture procedure within 10 min, Au@Ag core-shell bimetallic nanoparticles served as hotspot providers to facilitate the enhancement of biological Raman signals. The results demonstrated that the minimum detection limit of E. piscicida could be as low as 10 5 cfu/ml. The peak intensity at 1628 cm −1 ( E. piscicida ) showed a linear relationship with the logarithm of the bacterial concentration ( R 2 = 0.997). A mimic test was conducted by spiking E. piscicida into tap water. Linear discriminant analysis (LDA) was also harnessed to classify different types of fish bacteria. And the positive rates of the training set and the prediction set were 100% and 80%, respectively. The whole experimental procedure only takes 20 min. This method opens a new avenue for the rapid detection and identification of fish pathogenic bacteria.
研究领域:
水产养殖学
·
生物分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）