JOURNAL OF ALLOYS AND COMPOUNDS
·
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.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·275-282
·
IF 1.835
Liu Xiaonan,Zhang Youkui,Bian Liang,Li Jinshan
The adsorption of bovine serum albumin (BSA) protein is important for protein research but remains a great challenge. Here, the hydrothermal method and calcination in a hydrogen-argon mixed atmosphere were used to obtain ordered mono-crystalline magnetic Fe 3 O 4 nanorings with controllable size and uniform structure, which were applied to the adsorption of BSA protein. The results showed that the magnetic Fe 3 O 4 nanorings prepared have the advantages of good crystallinity, controllable morphology, and excellent magnetic response. The Fe 3 O 4 nanorings had an outer diameter of ~160–180 nm, inner diameter of ~80–110 nm, and height of 70 to ~110 nm. The amount of BSA adsorbed by magnetic Fe 3 O 4 nanorings increased with increasing protein concentration; when the concentration of BSA was ~2.75 mg·mL -1 the adsorption amount approached saturation. When the pH value of the solution was ~5, the Fe 3 O 4 nanorings absorption of BSA was greatest. With increasing adsorption time, the amount adsorbed increased gradually. Adsorption equilibrium was reached after 3 h. According to the formula, the saturated adsorption capacity of BSA per gram of magnetic Fe 3 O 4 nanorings was 325.2 mg.
.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Cong Liu,Yanhui Li,Qian Duan
A novel hybrid organic/inorganic magnetic and thermal dual-responsive core-shell green photocatalyst zinc-tetracarboxyl-phthalocyanine- g -Fe 3 O 4 @SiO 2 @TiO 2 - g -poly( N -isopropyl acrylamide) had been prepared. Firstly, Fe 3 O 4 @SiO 2 @TiO 2 (FST) was prepared with core-shell structure, then thermosensitive poly( N -isopropylacrylamide) (PNIPAM) immobilized on the surface of 3-(methacryloxypropyl)-trimethoxysilane (MPS) modified FST by radical polymerization. Below the lower critical solution temperature (LCST), PNIPAM was hydrophilic to ensure them disperse uniformly in aqueous solution, and above LCST, PNIPAM became hydrophobic to accelerate the separation of FST from water. Secondly, zinc-tetracarboxyl-phthalocyanine (ZnTcPc) grafted on the surface of FST- g -PNIPAM by ester bonds and sensitized TiO 2 to broaden absorption light range from ultraviolet to visible region to enhance photocatalytic activity. The photocatalytic test revealed that the decomposition rate of Rhodamine B (RhB) came to 91.8% after 60 min with ZnTcPc- g -FST- g -PNIPAM under visible light. When exposed under sun light, the degradation efficiency reached to 96.9%. It meant ZnTcPc- g -FST- g -PNIPAM was more suitable for organic pollutant degradation in nature. In addition, ZnTcPc- g -FST- g -PNIPAM performed efficient synergistic effect of thermal (>LCST) and magnetic responded recovery for reusing. And the degradation rate of RhB under recyclable photocatalyst was reduced 9.6% after 4 cycles. Above all, ZnTcPc- g -FST- g -PNIPAM would be an efficient photocatalyst with magnetic and thermal dual-responsive recovery used in water treatment.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Meng-Jie Chang,Wen-Na Cui,Hua Wang,Jun Liu,Hui-Lu Li,Hui-Ling Du,Long-Gui Peng
A facile methodology for fabricating novel magnetic fibrous visible light photocatalysts CoFe 2 O 4 /BiOI (CFO/BiOI) is presented. The fabrication procedure involves production of electrospun CoFe 2 O 4 nanofibers and subsequent controllable decoration of BiOI nanoplates by both the successive ionic layer adsorption and reaction (SILAR) and solvothermal methods on CoFe 2 O 4 nanofiber surface. The BiOI nanoplates on the fiber surface obtained by two methods are highly crystallized with lamellae morphology. The resulting CFO/BiOI fibers exhibit strongly magnetic response to external magnetic field and can be quickly collected. All the CFO/BiOI fiber samples exhibit excellent visible light photocatalytic performance towards degrading RhB regardless of the preparation methods, in which h + and O 2− play the major roles examined by the trapping experiment. Above 80% RhB dyes can be degraded within 2 h after 3 cycles under visible light irradiation, suggesting the good reusability of the photocatalysts. This work demonstrates that the CFO/BiOI is characteristic with high visible light photocatalysis performance and magnetic response, hence is promising for photocatalysis.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuemei Li,Yang Shen,Fangyu Jin,Jingbo Zhang,Yanyan Yang,Xiaoshu Qu
Nuclear waste management and nuclear energy generation require the proper disposal of 129 I and 131 I, which are radioactive isotopes of iodine. For recognition of different types’ iodine, a magnetic poly (ionic liquid)s (Fe 3 O 4 @SiO 2 -MPS-PILs) was formed by the selected imidazole ionic liquid monomer and core–shell Fe 3 O 4 @SiO 2 -MPS via free radical polymerization. The resulting adsorbent containing plenty of imidazole N-heterocycle units, benzene rings, and ionic bonds in the backbones was suitable for simultaneously adsorbing iodine molecules and iodide ions. The adsorption mechanisms for iodine in cyclohexane and iodide ions from aqueous solution were based on charge transfer and ion exchange mechanisms, respectively. The adsorption equilibrium for iodine in cyclohexane was attained at 12 h, and the kinetics of iodine adsorption closely followed the pseudo-second-order model. Iodine adsorption on Fe 3 O 4 @SiO 2 -MPS-PILs was best described by Langmuir model with a maximum iodine adsorption capacity of approximately 714.29 mg g −1 . Iodide ions adsorption was best explained with Freundlich model and a maximum adsorption capacity of 335.80 mg g −1 was achieved in an iodide solution with a 500 mg L –1 concentration. Notably, Fe 3 O 4 @SiO 2 -MPS-PILs retained over 90 % of its original adsorption performance after the 5th cycle. This work proves that the adsorbent Fe 3 O 4 @SiO 2 -MPS-PILs was efficient and recyclable, and has good application prospects in the practical treatment of iodine and iodide.
研究领域:
环境科学
·
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Juan Wu,Wei Jiang,Aipeng Deng,Yewen Shen,Wei Jiang,Renbing Tian
In this work, a high-performance probe for Hg 2+ detection has been successfully synthesized based on Rhodamine B isothiocyanate (RBI) and thioglycolic acid (TA) co-modified Fe 3 O 4 @Au nanocomposites. The probe has many favorable properties, including suitable size and magnetic response (46.28 emu/g). Importantly, the fluorescence changes of the probe are remarkably specific for Hg 2+ in the presence of other competitive cations, and the limit of detection (LOD) for Hg 2+ in aqueous solutions is lower (3.03 nM) than the value of the World Health Organization (30 nM), which meet the selective and sensitive requirements for practical application. Interestingly, due to the magnetic responsive performance of Fe 3 O 4 , the probe can be recycled by a magnet and reused by addition of free RBI into Fe 3 O 4 @Au solutions that were already used for Hg 2+ detection. Furthermore, the experiments of probe for monitoring Hg 2+ inside human umbilical vein endothelial (HUVEC) cells reveal that the probe has biocompatibility and low cytotoxicity, and can effectively detect Hg 2+ in a short time. All the results presented in this study show that the proposed probe has significant potential for Hg 2+ detection in environmental and biological samples.
研究领域:
分析化学
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生物医学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 31
·15856-15862
·
IF 3.708
Jingjing Wang,Chu Gong,Yinong Wang,Guolin Wu
For the purpose of tumor-specific drug delivery applications, a magnetic and pH dually responsive nano-carrier with a multilayer core–shell architecture was prepared from amine-functionalized Fe3O4@SiO2 through the surface-initiated ring opening polymerization of benzyl-L-aspartate N-carboxyanhydride, and then coated with α-methoxy poly(ethylene glycol) (mPEG) via a pH-sensitive benzoic–imine bond. In order to control the layer thickness of poly(benzyl-L-aspartate) (PBLA), a surface passivation agent was applied to modulate the amino density of the functionalized Fe3O4@SiO2 initiator. In this system, the Fe3O4@SiO2 nanoparticles function as a superparamagnetic core used to target the drug loaded nanocarriers to the pathological site. Meanwhile, the mPEG and PBLA segments serve as a pH-sheddable hydrophilic corona and a hydrophobic middle layer used to load the drug via hydrophobic interactions. The obtained materials were characterized by FT-IR, 1H NMR, DLS, zeta-potential, TEM, TGA and hysteresis loop analysis. Furthermore, the loading and release behavior of doxorubicin on the nanocarrier was investigated and it was shown that the drug loaded nanoparticle was relatively stable under physiological conditions and quickly released in response to acidity due to the shedding of mPEG shells through the pH-cleavage of intermediate benzoic–imine bonds. This pH and magnetic responsive nanoparticle has appeared highly promising for the targeted intracellular delivery of hydrophobic chemotherapeutics in cancer therapy.
研究领域:
生物材料学
·
药剂学
·
癌症治疗
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 2
·1-8
·
IF 1.784
Bi Yong-guang,Liu Di
The effect of calcination temperature and catalyst dosage on degradation rate of methyl orange has been investigated and 0.04 g TiO 2 with 700 °C calcination temperature was selected as the object of doping due to its higher degradation efficiency (99% in less than 1 h), Fe 3 O 4 modified with citric acid was used to improve the recovery and reuse of catalyst, the effect of doping amount of Fe 3 O 4 on the photo-catalytic efficiency of methyl orange has been discussed, and the results showed that the methyl orange degraded above 97% with 20 mg Fe 3 O 4 doped into TiO 2 when the TiO 2 @Fe 3 O 4 was used three times. The particles were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photo-electron spectroscopy; the magnetic properties were measured by PPMS-DynaCool type vibrating magnetometer; the composite showed excellent magnetic response with saturation magnetization of 9.5 emu g −1 . Zeta-potential analysis indicated that TiO 2 (3.6 mV) and Fe 3 O 4 (− 16.8 mV) are linked by electrical attraction, demonstrating that doping of Fe 3 O 4 is beneficial to the recycle and reuse of catalyst and improves the photo-catalytic efficiency, and TiO 2 @Fe 3 O 4 is suitable for industrial production.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Jing Li,Qingxiang Zhou,Yalin Wu,Yongyong Yuan,Yongli Liu
In this study, well-defined magnetic and thermal dual-responsive nanomaterials were synthesized, which contained ultrafine core-shell Fe@SiO 2 nanoparticles as magnetic core and poly( N -isopropylacrylamide) (PNIPAM) as thermosensitive outer shell. The fabricated nanoparticles were characterized and investigated for the adsorption of four phenolic compounds , including bisphenol A (BPA), tetrabromobisphenol A (TBBPA), 4- tert -octylphenol (4-OP) and 4- n -nonylphenol (4-NP). The experimental results demonstrated that the excellent adsorption rates were attributed to hydrophobic effect, hydrogen-bonding interaction, and electrostatic attraction. The adsorption process followed pseudo-second-order kinetics model and nonlinear isotherms, indicating heterogeneous adsorption process. The adsorption efficiency of 4-NP using Fe@SiO 2 @PNIPAM was more than 90% under optimized condition within 2 h. The determined maximum adsorption amounts of BPA, TBBPA, 4-OP and 4-NP were 2.43, 6.83, 24.75, and 49.34 mg g −1 , respectively. Meanwhile, a magnetic solid phase extraction (MSPE) method with Fe@SiO 2 @PNIPAM was established to determine these four compounds simultaneously. Under the optimal conditions, the linearity ranges were in the range of 2–200, 2–300, 2–100 and 2–100 μg L −1 for BPA, 4-OP, TBBPA, and 4-NP, respectively, and the detection limits were in the range of 0.58–0.76 μg L −1 , respectively. The applicability of the proposed method was evaluated by analyzing three fresh water samples, and satisfactory spiked recoveries in the range 70.9–119.9% were achieved. It was proved that these adsorbents could be easily collected and recycled owing to the appropriate magnetism. The results also demonstrated that the as-prepared adsorbents had promising potential in the enrichment and analysis of detrimental organic pollutants from water.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Qian Du,Chuan Zhang,Si Sun,Yang Wang,Houtao Liu,Yingying Wei,Yong Jiang
Smart surfaces prepared using superhydrophobic coatings have been used to control the movement of tiny aqueous droplets for many years. However, the control of both aqueous droplets and oily droplets is still a challenge. Herein, a novel smart superamphiphobic composite film is developed with a superamphiphobic and magnetic surface as well as a soft elastic substrate for liquid droplets manipulation. The raspberry-like nanoparticles on the surface are synthesized by co-hydrolyzation of fluoroalkyl silane and tetraethoxysilane on iron oxide nanoparticles. The resulting composite nanoparticles (F/SiO2@Fe3O4 NPs) exhibit excellent superhydrophobicity (WCA of about 170°) and superoleophobicity (OCA of about 160°) as well as magnetism (saturated magnetization value of 12.0 emug–1). The morphologies of the F/SiO2@Fe3O4 NPs were investigated by transmission electron microscopy and scanning electron microscopy. Chemical composition and magnetization value of these magnetic nanoparticles as well as the magnetic field induced droplets manipulation behavior of the smart surface were also evaluated. The smart surface can realize the manipulation of both water droplets and oil droplets, which demonstrates potential applications in microfluidic technologies.
研究领域:
材料科学
·
纳米技术
·
微流控技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2017
·
IF 3.752
Tiantian Cao,Zijian Zhou,Qian Chen,Zhen Li,Shengming Xu,Jianlong Wang,Minghou Xu,Teresa Bisson,Zhenghe Xu
A novel class of magnetically responsive catalytic sorbents are proposed and synthesized with a potential application to simultaneous removal of Hg 0 and NO at low temperature from the flue gases of coal-fired power plants. The catalytic sorbent consists of magnetite (Fe 3 O 4 ), molecular sieve (HZSM-5), supported silver nanoparticles and catalytically reactive component of V 2 O 5 . Each of these materials provides a unique function for the purpose of capturing mercury, removing NO, and separation from fly ash. After separation from the fly ash, the spent sorbent can be regenerated and reused, leaving an uncontaminated fly ash product. The successful synthesis as designed was confirmed and properties of the catalytic sorbent were characterized by several methods. The synthesized catalytic sorbent was able to completely capture Hg 0 at 150 °C with a capture capacity as high as 32.4 μg·g −1 , while achieving 84% removal of NO at 150 °C. Even at a relatively high space velocity, the catalytic sorbent achieved 97% Hg 0 and 80% NO removal simultaneously, while maintaining a good stability after repetitive regeneration and recycle. The magnetically responsive catalytic composite was shown to be a promising candidate for multi-pollutant emission control from coal-fired power plants.
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
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Tao Yang,Yufei Zhang,Jing Wang,Fenghong Huang,Mingming Zheng
The traditional reutilization of high-acid value oil resources causes pollution, suffers from high energy consumption, and brings relatively low economic value. In this study, high-acid value oil was converted into high-value product phytosterol esters (PEs) using a “one-pot” enzymatic cascade reaction strategy including the hydrolysis of high-acid value oils into free fatty acids (FFAs) and followed by its esterification of phytosterols. Lipase AYS was immobilized on magnetic hollow mesoporous carbon nanospheres to obtain AYS@MHMCS, forming a sustainable and solvent-free Pickering interfacial biocatalysis platform. Each droplet in the emulsion system served as a microreactor with the reactants in the oil phase; the byproduct glycerol was spontaneously excreted to the aqueous phase which would “push” the hydrolysis reaction forward. The products of hydrolysis (fatty acids) remained in the oil phase, continuing the next esterification reaction with phytosterols, which ensured the efficient and continuous operation of the tandem reaction. Benefiting from the interfacial activation effect of lipase, the catalytic efficiency of the emulsion system was 30 times that of the single-phase system. The yield of PEs was up to 90%, while the highest in the single-phase was only 30%. Additionally, the magnetic-responsive Pickering emulsion could recover AYS@MHMCS intactly in 15 min, and there would be no significant loss of catalytic activity even after continuous reuse for 15 cycles. This method not only provides a robust biocatalysis technique with a sustainable interface but also paves the way to high-value utilization of high-acid value oil resources.
研究领域:
生物催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）