Journal of Materials Chemistry A
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2017
·Vol. 5
·期 20
·9937-9945
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IF 8.867
Huirong Chen,Kui Shen,Junying Chen,Xiaodong Chen,Yingwei Li
Semiconducting metal oxides have been considered as effective photocatalysts for the degradation of organic pollutants to decolorize contaminated water. However, the poor performance and difficulty in recycling greatly hinder their practical application. Herein, we designed and fabricated, for the first time, a novel ZnO@C–N–Co core–shell nanocomposite towards efficient and recyclable photocatalysis by directly pyrolyzing a hollow Zn/Co–ZIF matrix consisting of a ZIF-8 shell with some Co–ZIF nanoplates inside the hollow cavity. It was demonstrated that the ZIF-8-shell-derived ZnO nanoparticles could spontaneously agglomerate and move to the hollow cavity while the internal Co NPs transferred inversely to the ligand-derived N–C shell at suitable pyrolysis temperature, resulting in the unique ZnO@C–N–Co core–shell structure. This unique nanostructure possessed the following superior properties: (1) a core–shell structure may make the intermediate ZnO much more stable during the reaction; (2) a porous carbon shell can not only provide a high BET specific area and thus high adsorption capability for reactants, but can also inhibit the recombination of photogenerated electrons and holes; (3) the embedded Co NPs were able to provide richer electron traps that further suppress the recombination of electrons and holes. As exemplified for the degradation of methyl orange, the ZnO@C–N–Co showed a significantly improved performance and excellent recyclability due to the highly synergistic effects between the C–N–Co shell and the robust ZnO. This strategy for the synthesis of MOF-derived core–shell nanomaterials could offer prospects for developing highly efficient photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Guangdi Nie,Xiaofeng Lu,Maoqiang Chi,Mu Gao,Ce Wang
Improving the conductivity and specific surface area of electrospun carbon nanofibers (CNFs) is beneficial to a rapid realization of their applications in energy storage field. Here, a series of one-dimensional C/MO x (M = Mn, Cu, Co) nanostructures are first prepared by a simple two-step process consisting of electrospinning and thermal treatment. The presence of low-valence MO x enhances the porosity and conductivity of nanocomposites to some extent through expanding graphitic domains or mixing metallic Cu into the CNF substrates. Next, the C/MO x frameworks are coated with MnO 2 nanosheets/nanowhiskers (C/MO x @MnO 2 ), during which process the low-valence MO x can partly reduce KMnO 4 so as to mitigate the consumption of CNFs. When used as active materials for supercapacitor electrodes, the obtained C/MO x @MnO 2 exhibit excellent electrochemical performances in comparison with the common CNFs@MnO 2 (CM) core-shell electrode due to the combination of desired functions of the individual components and the introduction of extra synergistic effect. It is believed that these results will provide an alternative way to further increase the capacitive properties of CNFs- or metal oxide-based nanomaterials and potentially stimulate the investigation on other kinds of C/MO x composite nanostructures for various applications.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Yangjian Chen,Fujun Peng,Xiaoda Song,Jicheng Wu,Wenbin Yao,Xiangdong Gao
Polymer-based paclitaxel (PTX) conjugates have demonstrated application potentials to improve the water solubility and enhance the efficiency of drug delivery. In this study, a novel HA-based drug conjugate, HA-6-PTX, was designed and successfully synthesized by chemically grafting PTX to the C-6 position of N -acetyl- d -glucosamine (GlcNAc) of hyaluronic acid (HA) using hexanediamine as the linker. Leaving the carboxylate of HA chain unaffected, the conjugate with drug loading as high as 21.8% showed an excellent water solubility of 168 mg/mL and exhibited increased drug release in the presence of hyaluronidase. Compared to free PTX, HA-6-PTX demonstrated increased cytotoxicity and enhanced apoptosis-inducing effect against HepG2 and A549 cells due to the increased cellular uptake of drug via HA-receptor mediated endocytosis. It was concluded that the HA-6-PTX conjugate could be potentially utilized for further exploration as targeted drug delivery to enhance antitumor efficacy.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Bangrun Wang,Zhaoyin Wen,Jun Jin,Xiaoheng Hong,Sanpei Zhang,Kun Rui
Germanium is considered as a promising anode material for lithium ion batteries (LIBs) due to its high-capacity. However, owing to the huge volume variation during cycling, the batteries based on germanium anodes usually show poor cyclability and inferior rate capability. Herein, we demonstrated a novel strategy to uniformly anchor the core-shell structured germanium@carbon (Ge@C) on the reduced graphene oxide (rGO) nanosheets by the strong adhesion of dopamine. In the resulting Ge@C/rGO hybrid, the amorphous carbon layer and rGO nanosheets can effectively reduce the agglomeration of germanium and provide buffer matrix for the volume change in electrochemical lithium reactions. When used as anode materials for LIBs, Ge@C/rGO hybrids deliver a reversible capacity of 1074.4 mA h g −1 at 2C after 600 cycles (with capacity retention of 96.5%) and high rate capability of 436 mA h g −1 at 20C after 200 cycles. The encouraging electrochemical performance clearly demonstrates that Ge@C/rGO hybrids could be a potential anode material with high capacity, excellent rate capability, and good cycling stability for LIBs.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2016
·Vol. 99
·期 6
·2131-2137
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IF 2.787
YeHong Cheng,Yushi Qi,Ping Hu,Shanbao Zhou,Guiqing Chen,Jiadong An,Kunfeng Jin,Wenbo Han
To avoid introduction of milling media during ball-milling process and ensure uniform distribution of SiC and graphite in ZrB 2 matrix, ultrafine ZrB 2 –SiC–C composite powders were in-situ synthesized using inorganic–organic hybrid precursors of Zr(OPr) 4 , Si(OC 2 H 5 ) 4 , H 3 BO 3 , and excessive C 6 H 14 O 6 as source of zirconium, silicon, boron, and carbon, respectively. To inhabit grain growth, the ZrB 2 –SiC–C composite powders were densified by spark plasma sintering (SPS) at 1950°C for 10 min with the heating rate of 100°C/min. The precursor powders were investigated by thermogravimetric analysis–differential scanning calorimetry and Fourier transform infrared spectroscopy. The ceramic powders were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The lamellar substance was found and determined as graphite nanosheet by scanning electron microscopy, Raman spectrum, and X-ray diffraction. The SiC grains and graphite nanosheets distributed in ZrB 2 matrix uniformly and the grain sizes of ZrB 2 and SiC were about 5 μm and 2 μm, respectively. The carbon converted into graphite nanosheets under high temperature during the process of SPS. The presence of graphite nanosheets alters the load-displacement curves in the fracture process of ZrB 2 –SiC–G composite. A novel way was explored to prepare ZrB 2 –SiC–G composite by SPS of in-situ synthesized ZrB 2 –SiC–C composite powders.
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RSC Advances
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2016
·Vol. 6
·期 31
·25877-25881
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IF 3.289
Ling Li,Mingkun Wang,Ning Cui,Yuedi Ding,Qingling Feng,Wenming Zhang,Xiaowei Li
Incorporation of nanophase ceria into the cathode catalyst Pt/C was used as alternative cathode catalysts for the oxygen reduction reaction in an air-cathode single-chamber microbial fuel cell (SCMFC) for the first time. Electrochemical results reveal that the ceria doped Pt/C catalysts exhibited a higher catalytic performance than the pure Pt/C catalyst. The highest voltage of 580 mV and the maximum power density of 840 ± 24 mW m−2 were achieved from the 3 wt% CeO2 doped Pt/C cathode, which was larger than that of the pure Pt/C cathode.
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RSC Advances
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2016
·Vol. 6
·期 77
·73020-73027
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IF 3.289
D. Li,Y. Feng,D. S. Pan,L. W. Jiang,Z. M. Dai,S. J. Li,Y. Wang,J. He,W. Liu,Z. D. Zhang
Cactus-shaped core double-shelled FeCo/C/Fe2.5Cr0.5Se4 nanostructures with a spiky surface were prepared by combining an arc-discharge process with a high-temperature solution chemical method, in which FeCo nanoparticles serve as the, while carbon and ferrimagnetic Fe2.5Cr0.5Se4 (FCS) are the inside and the outside shells, respectively. The magnetic properties, electromagnetic response, and microwave absorption properties of the (x)FeCo/C/FCS nanocomposites in the 1–18 GHz frequency range were investigated by changing the mass ratio x between FeCo/C and FCS. The frequency dependences of μ′′ (imaginary parts of complex permeability) and ε′′ (imaginary parts of complex permittivity) of the (0 ≤ x ≤ 0.15)FeCo/C/FCS nanocomposites show distinct inverse trends of change in the high frequency ranges. Negative minimum values of μ′′ are found to be coupled with positive maxima of ε′′ due to a phase lag. The bare FCS–paraffin composite starts with a minimum μ′′ of about −0.07, which shifts to −0.44 and −0.05 when the mass ratio x is increased to 0.1 and 0.15, respectively. As x increases to 0.2, all the μ′′ values of the nanocomposites become positive. The best absorption property with a reflection loss (RL) peak of −54.5 dB at 10 GHz is obtained in the (x = 0.1)FeCo/C/FCS–paraffin composite and RL exceeding −20 dB can be achieved within the 3–18 GHz frequency range by choosing an appropriate layer thickness between 1.4 and 6 mm. The contribution of the negative μ′′ response to the microwave absorption is discussed.
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APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Zhaojie Wang,Ming Liu,Guijuan Wei,Peng Han,Xixia Zhao,Junxue Liu,Yan Zhou,Jun Zhang
The requirements of high power density, excellent cycling ability, flexibility and low cost, are of paramount importance and critical to develop flexible lithium ion batteries (LIBs) for wearable instruments. Here we reported the rational design and fabrication of a flexible self-supported lithium ion anode material, which consists of thin MoS 2 nanosheets grown on the surfaces of carbon@TiO 2 core-shell nanofibers. The resulting hierarchical ternary nanocomposites exhibited high reversible specific capacity (∼1460 mA h g −1 at 100 mA g −1 ), excellent cyclability (little capacity loss even after 1000 cycles) and rate performance (928 mA h g −1 at 2 A g −1 ) as anode in LIB. Furthermore, the binder-free anode material demonstrated new opportunities for flexible lithium ion batteries. The superior lithium storage performance is derived from the present well-designed hierarchical nanofiber structure and the synergic effect of different components and numerous interfaces.
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MICROCHIMICA ACTA
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2017
·Vol. 184
·期 12
·4679-4684
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IF 4.58
Zhu Shu,Lin Xia,Ran Peiyao,Mo Fangjing,Xia Qiao,Fu Yingzi
This paper describes an electrochemiluminescent (ECL) based method for chiral recognition and detection of both glutamate (Glu) enantiomers. The luminophore luminol (Lum) was used as both the reductant and stabilizer of Ag nanoparticles (AgNP-Lum) which were combined with carbon quantum dots (C-dots) and placed on a glassy carbon electrode (GCE) along with the enzyme glutamate oxidase (GluOx). The use of these materials is found to result in strong amplification of ECL. The nanomaterials used were characterized by transmission electron microscopy (TEM) and Fourier transform infrared (FTIR). The stepwise fabrication of the electrode was verified by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under optimized conditions and by applying a typical potential of 0.6 V, the ECL increases linearly in the 5.0 μM to 5.0 mM Glu concentration range, with a 1.6 μM lower detection limit and satisfactory selectivity. A Glu logic gate idea has been designed that is based on this enzymatic biosensor.
Schematic presentation of the electrochemiluminescent (ECL) biosensor. A glassy carbon electrode (GCE) was modified with C-dots and silver nanoparticles which were deoxidized by luminol (AgNP-Lum) for enzymatic specific detection.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2016
·Vol. 92
·期 7
·1601-1612
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IF 2.738
Jiahua Lu,Qing Liu,Zhongduo Xiong,Zhijun Xu,Yingjie Cai,Qiang Wang
BACKGROUND Synthetic dyes are present in the wastewater from many industrial processes and they cause serious problems to human and aquatic life. The development of a novel and effective peroxymonosulfate (PMS) activator is proposed to eliminate dyes pollution. A new magnetic nanocomposite, Fe 3 O 4 @C/MnCo 2 O 4 , was prepared and characterized. The activity of Fe 3 O 4 @C/MnCo 2 O 4 as heterogeneous catalyst for PMS activation was evaluated by the decolorization of Acid Orange II (AO II). RESULTS With a ‘Fe 3 O 4 @C/MnCo 2 O 4 + PMS’ system, the dye solution could be nearly completely decolorized in about 25 min over a wide pH range (pH 4.1−8.1), and 98% removal could be achieved in 15 min without pH adjustment (pH = 6.38). The influence of solution pH, dosage of catalyst and PMS, reaction temperature, and PMS activation mechanism were studied. It was found that sulfate radicals were the primary species responsible for the oxidation of AO II. The catalyst was magnetically separable and displayed good stability and reusability, giving six cycles of use without deterioration in its performance. CONCLUSION This study demonstrated the simple recycling and high activity of Fe 3 O 4 @C/MnCo 2 O 4 composite in PMS activation for the decolorization of AO II solution. It provides a promising way for the decontamination of organic pollutants. © 2016 Society of Chemical Industry
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fei Li,Zhuonan Huang,Yuqi Wang,Le Wu,Sinan Guan,Yue Wang,Ying Liu,Shuang Cheng,Jinlei Wu,Jun Hu,Xin Ding
Magnesium hydride (MgH 2 ) has garnered substantial consideration mainly due to its high gravimetric density and reliable resource, whereas its poor thermodynamics and kinetics for absorbing/releasing hydrogen restricts the largescale application. Certain catalysts have demonstrated remarkable activity in enhancing the hydrogen storage capabilities of MgH 2 . In this work, the nanoparticle-cumulated flower-like CoFe@C coated catalysts (denoted as CoFe@C) are controllably synthesized as expected by the MOF (Metal-Organic Farmwork) in-suit decomposition method at 800 °C, which exhibits an average pore size of 18.63 nm. Meanwhile, the particle size for the as-prepared CoFe alloy coated in carbon layer are approximately 10–20 nm, and the as-prepared samples are introduced to promote the de/rehydrogenation properties of MgH 2 at relatively lower temperatures. Due to the synergistic interaction of CoFe alloy nanoparticles serving as active sites and agglomeration resistance of carbon layers, the MgH 2 composites doped with CoFe@C-800 could initialize its decomposition process at 175.9 °C, and may desorb 6.0 wt% H 2 at 300 °C in 400 s. Additionally, the peak temperature and apparent activation energy during dehydrogenation decline significantly (with 35 % and 38 %, respectively). Furthermore, theoretical analysis results indicate a higher catalytic activity for the carbon-coated CoFe alloy owing to the synergetic effect between CoFe nanocomposite & carbon layer, which can facilitate the bond extension and strength decrease of Mg-H bonding. In brief, using MOF may derive transition metal and carbon layer, which could be a promising approach to stimulating the hydrogen storage properties of MgH 2 .
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CEMENT AND CONCRETE RESEARCH
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2024
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IF 10.9
Binmeng Chen,Xu Fang,Yuyang Zhao,Zongjin Li
In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCF with varying calcium to silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remain unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the increased C/S ratio of C-S-H. Since as C/S ratio increased, silicate in Q 3 state shifted to Q 1 state and the silicate chain became shorter, shifting from long-range, disordered to short-range, ordered. As the disordered self-seeding growth of long silicate chains derived from C-S-H continued, the Si-O-Si network of silica nanoparticles became chaotic, leaving more unreacted Si-OH on its surface. On the contrary, the short silicate chains displayed higher possibility of condensation, making nanoparticles with a smaller diameter.
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危险品化学品经营许可证（带存储）