RSC Advances
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2015
·Vol. 5
·期 24
·18832-18840
·
IF 3.84
Jinjuan Xue,Shuaishuai Ma,Yuming Zhou,Zewu Zhang,Ping Jiang
A novel Ag/ZnO/C plasmonic photocatalyst was synthesized via a facile calcination and photodeposition route. Samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results indicated that Ag and ZnO nanoparticles sized 5–10 nm were uniformly dispersed on the surface of the carbonaceous layers in Ag/ZnO/C composites. The adsorption capacity and photocatalytic activity were investigated by adsorption and photocatalytic degradation of tetracycline hydrochloride (TC-HCl) in aqueous solution. The results showed that the obtained Ag/ZnO/C sample exhibited higher adsorption capacity and enhanced UV and visible light driven photocatalytic activity to TC-HCl compared to ZnO/C and pure ZnO. With the presence of Ag nanoparticles and carbonaceous layers incorporated in the structure, the Ag/ZnO/C composites can make use of not only the UV region of sunlight, but also the visible region and efficiently promote photogenerated electron separation and transportation as well as generating more active reaction sites, which synergistically facilitate the photocatalysis process. Our present work provides a simple and new pathway for the design of ZnO-based catalysts that respond to both UV and visible light and promotes their practical application in various environmental and energy issues driven by solar light.
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高影响因子
Materials Research Express
·
2015
·Vol. 2
·期 9
·095502
·
IF 0
Jipeng Guan,Liping Zhao,Chenyang Xing,Yongjin Li
In this work, a novel flexible MWCNTs@MoO2-C nanocable composite for lithium ion battery anodes was fabricated by the electrospinning of homogeneously dispersed MWCNTs in a PVA/ammonium molybdate tetrahydrate solution and subsequent thermal treatment of the electrospun nanofibers. In the resulting MWCNTs@MoO2-C nanocable composite, the MoO2 nanoparticles were uniformly dispersed in amorphous carbon nanofibers that contained well-embedded MWCNTs as their cores. Compared with samples without MWCNTs, the unique nanocable composite exhibited not only a high specific capacity but also excellent cycling performance and good flexibility. It delivered a high reversible capacity of 832 mAh g−1 at a current density of 50 mA g−1 after 30 cycles. The enhanced electrochemical performance of the MWCNTs@MoO2-C nanocable composite was attributed to its novel nanocable structure ensuring not only effective contact between MoO2 and the liquid electrolyte, but also high conductivity for Li+ and e– transfer.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Yixuan Song,Tingting Qiang,Ming Ye,Qiuyang Ma,Zhen Fang
Design an effective absorbent that has high surface area, and perfect recyclable is imperative for pollution elimination. Herein, we report a facile two-step strategy to fabricate magnetically separable 3-dimensional (3D) hierarchical carbon-coated nickel (Ni@C) nanocomposites by calcinating nickel based metal organic framework (Ni 3 (OH) 2 (C 8 H 4 O 4 ) 2 (H 2 O) 4 ). SEM and TEM images illuminate that the nanocomposites were constructed by 8 nm nickel nanoparticle encapsulated in 3D flake like carbon. The specific surface area of the obtained nanocomposites is up to 120.38 m 2 g −1 . Room temperature magnetic measurement indicates the nanocomposites show soft magnetism property, which endows the nanocomposites with an ideal fast magnetic separable property. The maximum adsorption capacity of the nanocomposites for rhodamine B is 84.5 mg g −1 . Furthermore, the nanocomposites also exhibit a high adsorption capacity for heavy metal ions. The adsorbent can be very easily separated from the solution by using a common magnet without exterior energy. The as-prepared Ni@C nanocomposites can apply in waste water treatment on a large-scale as a new adsorbent with high efficiency and excellent recyclability.
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高影响因子
FUEL
·
2015
·
IF 3.52
Yujing Weng,Songbai Qiu,Chenguang Wang,Lungang Chen,Zhengqiu Yuan,Mingyue Ding,Qi Zhang,Longlong Ma,Tiejun Wang
In this work, a dual-bed aqueous catalysis system with Ru/C as catalyst was proposed for the liquid alkane (pentane/hexane: C5/C6) production from acid biomass hydrolysate. The low temperature (413 K) hydrogenation of biomass-derived carbohydrates into polyols was carried out in the first fixed-bed. The high temperature (523 K) hydrodeoxygenation (HDO) of polyols into alkanes was carried out in the down-stream bed. To screen the optimal reaction conditions, glucose and sorbitol were chosen for model tests. Whereby, reactor types, solution pH value, mineral acid, reaction temperature, pressure and sorbitol concentrations were studied. A maximum C5/C6 alkane yield of 61.9% was achieved from 20 wt% sorbitol solution (pH = 1.5) under 523 K and 4 MPa H 2 pressure in the fixed-bed reactor. For cassava and corncob hydrolysate, C5/C6 alkane yield of 38.8% and 44.1% were obtained, respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
·
IF 3.84
Qu Sheng,He Mei,Huimin Wu,Xiuhua Zhang,Shengfu Wang
Platinum–cobalt Pt x Ni alloy nanoparticles have been successfully fabricated by the chemical reduction method, using carbon (Vulcan XC-72) as support. The resulting modified glassy carbon electrode shows excellent catalytic activity for the oxidation of glucose. Under physiological conditions , the oxidation current of glucose has two specific linear ranges of 2.0 − 420 μM and 0.5–8.5 mM, with high sensitivities of 1795.1 μA mM −1 cm −2 and 707.72 μA mM −1 cm −2 , respectively. In addition, interference from the oxidation of ascorbic acid , uric acid , or acetamidophenol could be effectively avoided. The non-enzymatic glucose sensors based on this electrode exhibited excellent selectivity, stability, and repeatability. Thus, this novel non-enzyme sensor has potential application in glucose detection.
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RSC Advances
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2014
·Vol. 4
·期 58
·30573-30578
·
IF 3.708
Jun Wang,Bing Gao,Long Zhang,Rui Li,Jinpeng Shen,Zhiqiang Qiao,Guangcheng Yang,Fude Nie
Two-dimensional Co3O4 nanostructures with porous architectures are experiencing rapid development in functional material fields for their unique structures and properties. Porous Co3O4–C hybrid nanosheet (NS) arrays grown directly on various conducting substrates are synthesized by a controlled method for the first time via a facile hydrothermal synthesis approach in combination with heat treatment. These NS arrays reveal uniform hexagonal morphology and have combined properties of quasi-single-crystallinity and a pore network inside the architecture. A four-step formation mechanism is proposed to understand the growth process of nanosheet arrays grown on the substrate based on the change of morphology. Both the concentration of Co2+ and poly(vinylpyrrolidone) (PVP) play key roles in the formation of NS arrays. When tested as an anode material in lithium-ion batteries, the porous Co3O4–C hybrid NS arrays exhibit improved electrochemical properties of cyclic performance and high coulombic efficiency compared with the commercial Co3O4 and Co3O4/carbon nanocomposites. This approach, porous Co3O4–C NS arrays grown directly on different substrates (wafer, foam, alloy net, foil, especially flexible carbon cloth), provides an efficient route to produce NS arrays to meet the demand for diversity, and may be extended to synthesize other transition metal oxide materials for other applications.
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Chinese Journal of Natural Medicines
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2014
·
IF 0
Pei-Pei WANG,Guo-Wei ZHAO,Wen XIA,En-Ji HAN,Lan XIANG
This study was conducted to investigate the chemical constituents of Piper wallichii (Miq.) Hand.-Mazz. and evaluate their biological activity. Compounds were isolated by various column chromatographic methods, and their structures were elucidated on the basis of physical characteristics and spectral data. The 1, 1-diphenyl-2-picrylhydrazyl (DPPH)-scavenging activity and acetylcholinesterase (AChE)-inhibitory activity of the compounds were evaluated. Five compounds were obtained and identified as 8- C -β-D-glucopyranosylkaempferol-3- O -β-D-glucopyranoside ( 1 ), 1, 2-dihydro-6,8-dimethoxy-7-hydroxy-1-(3, 5-dimethoxy-4-hydroxyphenyl)- N 1 , N 2 -bis-[2-(4-hydroxyphenyl)ethyl]-2, 3-naphthalene dicarboxamide ( 2 ), goniothalactam ( 3 ), aristololactam A IIIa ( 4 ) and piperlonguminine ( 5 ). Compound 1 was a new flavonol C -glycoside, 2 was a rare lignanamide, which was isolated from the family Piperaceae for the first time, and compound 3 was isolated from this plant for the first time. Among them, 2 showed potent DPPH-scavenging activity, with IC 50 of 31.38 ± 0.97 μmol·L −1 ; Compounds 2 , 3 , and 4 showed AChE inhibitory activity at 100 μmol·L −1 , with inhibition rates of 28.57% ± 1.47%, 18.48% ± 2.41% and 17.4% ± 3.03%, respectively.
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PubMed
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2017
·
IF 3.094
Kejia Kang,Lianmeng Zhang,Guoqiang Luo,Jian Zhang,Rong Tu,Chuandong Wu,Qiang Shen
In this work, to improve the strain capacity of tungsten , β-SiC was added to form W-Si-C multi-phase composites composed of W, W 2 C, and W 5 Si 3 using the arc-melting method. The relationship between microstructure and mechanical behavior was investigated, and a microstructural evolution mechanism was proposed. The grain size of the W was refined significantly from 1071.8 to 5.4 µm as the SiC content increased. The micro-hardness (3.67–12.79 GPa) and ultimate compressive strength (UCS) (0.90–2.29 GPa) of the W-Si-C multi-phase composite obviously increased as the β-SiC content increased to 4 wt% due to the grain refinement and segregation of the W 2 C and W 5 Si 3 at the grain boundaries. The highest strain of UCS (21.9%) was obtained at 1 wt% SiC, which is three times of that of pure W (7.4%) and is a result of the refined W grain size and the potentiation of W 5 Si 3.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 12
·B495
·
IF 3.259
Dan Liu,Sheying Dong,Wenbo Wei,Yile Fu,Tinglin Huang
Ni/NiO/C composites were prepared by successively thermal annealing Ni-based metal organic frameworks (Ni-MOFs) in nitrogen and air atmosphere. Moreover, comparative electrochemical properties of the material before and after calcination were investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The result indicated that the Ni/NiO/C was more suitable for the matrix of myoglobin (Mb)/hemoglobin (Hb) immobilization to fabricate enzyme-based biosensor for the detection of nitrite (NO2−). Among them, the Mb-based biosensor exhibited a wider linear range from 4 to 40892 μM with a lower detection limit of 1.3 μM (S/N = 3) toward NO2−. The good electrochemical properties of Ni/NiO/C could be mainly due to the synergistic integration of MOFs-derived Ni, NiO and carbon hybrids, which could work as electron conducting pathways between the Mb (Hb) and the electrode surface to facilitate the electron transfer process. Therefore, this work suggested that MOF-derived composites have a great potential for constructing wide range of sensing interface.
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APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Yuan Chen,Shanshan Jie,Congqiang Yang,Zhigang Liu
The development of highly active and efficient heterogeneous catalytic oxidation systems has become an attractive research area. In this study, nano cobalt-coordinated nitrogen-doped carbon catalysts (Co-N/C), which were prepared by the pyrolysis of cobalt porphyrin supported on carbon black precursor, were used as highly active catalysts for the oxidation of hydrocarbons with tert -butyl hydroperoxide as the oxidant. The results showed that the catalyst was efficient in the selective oxidation of a variety of saturated (including primary, secondary, and tertiary) C H bonds. The catalyst displayed the best catalytic performance, which was comparable to those for previously reported metal oxide catalysts and even better. The resultant Co-N/C catalysts were characterized in detail by XRD, nitrogen adsorption/desorption isotherms, TEM, SEM and XPS. The homogeneous distribution of the Co species and interactions between the Co-N species could improve the synergistic effect between the Co O, Co N and N C species, which led to their excellent catalytic performance. A first order kinetics was observed for the reaction with the apparent activation energy for ethylbenzene oxidation was 22.2 ± 2.1 kJ mol −1 .
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Yi Wang,Pu Zhang,Xuanxiang Mao,Wensheng Fu,Chun Liu
In this work, we have demonstrated that seed-mediated growth of bimetallic nanoparticles via heterogeneous nucleation can be used as a powerful means to improve the sensitivity of an analytical method for antioxidants that involved in a redox reaction. Taking vitamin C (Vc) as a typical example, a simple and sensitive method for the detection of antioxidants has been developed. Specifically, with the aid of Vc, Ag atoms that generated from the reduction of Ag + ions tend to deposit on the surfaces of Au nanocages (the seeds) to form Au@Ag nanoboxes rather than self-nucleation. As a result, the localized surface plasmon resonance (LSPR) of Au nanocages shifts from near-infrared region to a shorter wavelength owing to the transformations in both morphology and component. The detection toward Vc can be achieved through a linear relationship between the wavelength changes of LSPR peak and the corresponding concentration of Vc in the range of 0.05–7.5 μM, with a limit of detection as low as 24 nM. Moreover, this method shows high selectivity for the detection of Vc when potential species coexisted in the system, and has been successfully applied for the determination of Vc in pharmaceutical products.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 29
·11357-11364
·
IF 8.262
Teng Liu,Pingping Zhao,Xing Hua,Wei Luo,Shengli Chen,Gongzhen Cheng
A simple Zn/Fe bimetallic zeolitic–imidazolite framework (ZIF) carbonization method is developed to synthesize an Fe–N–C hybrid with hierarchical nitrogen-doped porous carbons crossed by carbon nanotubes. Both the specific ratios of Zn/Fe in the bimetallic metal–organic framework (MOF) precursors and the selected annealing temperature are essential for the formation of this unique hybrid structure with good conductivity and exposure of more active sites. The resulting FeNC-20-1000 hybrid electrocatalyst exhibits excellent oxygen reduction reaction (ORR) activity, with a half-wave potential of 0.770 V comparable to that of the commercial Pt/C catalysts in acidic media, and a half-wave potential of 0.880 V, ca. 50 mV more positive than that of Pt/C for ORR in alkaline solution. More importantly, the as-prepared Fe–N–C hybrid exhibits much more stability for the ORR in both acidic and alkaline solutions than Pt/C, which makes it among the best non-noble-metal catalysts ever reported for ORR under acidic and alkaline conditions.
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