Shaoming Fang

Zhengzhou University of Light Industry, Cheng, Henan Sheng, China

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Publications (82)246.69 Total impact

  • Zhenxin Liu · Depeng Wu · Yu Xing · Xuehui Guo · Shaoming Fang
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    ABSTRACT: Literature about sulfur addition over AB2O4 spinel-supported cobalt CO hydrogenation catalysts is sparse. Research about the use of carbon disulfide as the sulfur carrier for the poisoning of cobalt catalysts is also sparse. In this study, effect of the addition of 0.1–1, 10, 100 and 300 ppmv of sulfur (injected as carbon disulfide) on the structure and performance of a Co/ZnAl2O4·Al2O3 CO hydrogenation catalyst was characterized (by ICP, XRD, nitrogen sorption and FESEM) and evaluated in a fixed-bed reactor. The addition of 0.1–1 ppmv of sulfur did not have a significant negative effect on the activity of Co/ZnAl2O4·Al2O3 catalyst. At S equivalent concentration of 100 ppmv, the deactivation of Co/ZnAl2O4·Al2O3 catalyst was reversible to some extent. At identical S equivalent concentration of 100 ppmv, the rate of S sorption by Co/ZnAl2O4·Al2O3 catalyst was 3.1 times higher than that by Co/γ-Al2O3 catalyst, making the former a potential catalyst (or sorbent) to be loaded at the top portion (or pre-catalytic bed) of a fixed-bed FT reactor to scavenge sulfur from syngas feedstock.
    No preview · Article · Jan 2016
  • Yu Xing · Zhenxin Liu · Yingying Xue · Depeng Wu · Shaoming Fang
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    ABSTRACT: Literature about Lewis base doped spinel-type cobalt CO hydrogenation catalysts is sparse. A series of undoped Co/γ-Al2O3 as well as Zn–O Lewis base doped Co0/(Al)–O–(Zn) nanocomposites were prepared via coprecipitation or impregnation followed by calcinations and single-step reduction. The overall concentration of zinc by weight ranges from 0 to 68.23 %. These materials were examined by XRD, nitrogen sorption, CO2-TPD, FESEM and HRTEM. The nanocomposite with atomic Zn/(Al + Zn) ratio of 1/5 exhibits the smallest average size of Co0 crystallites of 7.6 nm as well as the largest BET surface area of 151.1 m2/g. The CO hydrogenation performance of nanocomposites were tested at a pressure of 2.0 MPa and a space velocity of 700 mL g cat−1 h−1. Variation trends of CO hydrogenation performance due to gradual doping with Zn–O Lewis base were described in details. The CO2-TPD data suggest that doping with zinc may generally enhance the surface basicity of nanocomposites. Appropriate doping the alumina support with Zn–O Lewis base may effectively lower down the production of methane by up to ca. 23 %, suppress the production of C5+ hydrocarbons, facilitate the production of C2–C4 hydrocarbons, and significantly enhance the C2–C4 olefin/paraffin ratio, which are favored by the Fischer–Tropsch to olefins (FTO) process. Graphical Abstract The CO2-TPD data suggest that doping with zinc may generally enhance the surface basicity of nanocomposites.
    No preview · Article · Jan 2016 · Catalysis Letters
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    ABSTRACT: It is highly desirable and a popular topic in scientific research to develop a highly sensitive and selective detection and quantitative analysis method of determining trace silver ions (Ag+) in aqueous media since Ag+ ions are recognized as one of the most hazardous metal pollutants. Three-dimensional graphene oxide (3D-GO) was decorated with Fe3O4 to form nanocomposites of Fe3O4@3D-GO, which were further used as electrode materials in an electrochemical DNA sensor for detecting Ag+. Because of the chemical functionality and porous structure of the developed nanocomposites, single-stranded and cytosine-rich oligonucleotides could be anchored onto their surfaces or interior, followed by selective detection of Ag+ through formation of C-Ag+-C complex forms. The results of electrochemical measurement showed that the Fe3O4@3D-GO nanocomposites exhibits high sensitivity for detecting Ag+ with a detection limit of 2.0 pM within the range of 0.01-100 nM Ag+ (S/N = 3). The developed electrochemical biosensor based on Fe3O4@3D-GO exhibits highly selectivity, good repeatability, and stability for detecting Ag+ ions. The results of this work demonstrate that Fe3O4@3D-GO nanocomposites could be used as a promising tool to detect heavy metal ions in water or the environment.
    No preview · Article · Dec 2015 · Journal of Alloys and Compounds
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    ABSTRACT: This article describes an aptasensor for lysozyme that is based on a gold electrode modified with an aptamer-wrapped composite consisting of three-dimensional reduced graphene oxide, cuprous oxide, and plasma-polymerized propargylamine (Cu2O@rGO@PpPG) as the sensing layer. The nanocomposite consisting of Cu2O@rGO was synthesized by simultaneously reducing GO and Cu(II) ions with glucose and then modified by plasma-enhanced chemical vapor deposition using propargylamine as the monomer gas. The resulting amine-rich nanofilms of Cu2O@rGO@PpPG nanocomposite were deposited on a gold electrode. Differential pulse voltammetry and electrochemical impedance spectroscopy show these layers to exhibit a good amperometric response and variation of the charge transfer resistance to lysozyme after aptamer strands had been immobilized on the films via electrostatic interaction between the negatively charged phosphate groups of the aptamer and the positively charged amino groups on the electrode. The sensor, when operated at 0.22 V (vs. Ag/AgCl), can detect lysozyme in the 0.1 nM to 200 nM concentration range with a 0.06 nM limit of detection. In addition, the sensor displays excellent selectivity and repeatability. In our perception, this strategy for preparing aptasensors holds a great potential with respect to the use of plasma-modified nanocomposites in clinical analysis. Graphical Abstract An effective aptasensor was constructed using a nanocomposite consisting of three-dimensional reduced graphene oxide, cuprous oxide, and plasma-polymerized propargylamine as the sensitive layer. It exhibits a detection limit of 0.06 nM and an analytical range of 0.1 to 200 nM.
    No preview · Article · Dec 2015 · Microchimica Acta
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    ABSTRACT: Cu2O@aptamer nanospheres were prepared via a facile one-step synthesis using aptamer as template. The precursor CuSO4 was reduced in the presence of aptamer to form Cu2O@aptamer nanospheres. In comparison with the pristine Cu2O immobilized with aptamer, the resultant Cu2O@aptamer nanospheres exhibit high sensitivity for detecting thrombin. The results showed that the developed electrochemical biosensor based on Cu2O@aptamer nanospheres has a detection limit of 0.01 ng mL−1 (0.33 pM) within the linear range from 0.1 to 50 ng mL−1 toward the thrombin detection. Moreover, excellent selectivity toward interfering proteins, such as IgG, IgE, and BSA, was achieved. The fabricated electrochemical immunobiosensor provides a promising alternative for determining other biological samples.
    No preview · Article · Dec 2015 · Sensors and Actuators B Chemical
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    ABSTRACT: We synthesized novel Co3(PO4)2-based nanocomposites with 3D porous architectures via self-assembly; here, bovine serum albumin (BSA) and aptamer were used as organic phases to produce Co3(PO4)2@BSA and Co3(PO4)2@Apt nanocomposites, respectively. The formation mechanism of Co3(PO4)2-based nanocomposites was described based on characterizations of their physio-chemical performance, and the developed nanocomposites were applied as scaffold materials to construct a novel electrochemical aptasensor and detect platelet-derived growth factor-BB (PDGF-BB). The PDGF-BB targeting aptamer must be immobilized onto the Co3(PO4)2@BSA-modified electrode to detect PDGF-BB, whereas Co3(PO4)2@Apt-based aptasensor may be directly used to determine the target protein. Electrochemical impedance spectroscopy results showed that the developed Co3(PO4)2@BSA- and Co3(PO4)2@Apt-based aptasensors present highly sensitive detection ability toward PDGF-BB. Due to the special nanoflower structure, the Co3(PO4)2@BSA-based aptasensor features a detection limit of 3.7pgmL(-1); while the limit of detection of the Co3(PO4)2@Apt-based aptasensor is 61.5pgmL(-1), which is the possible bioactivity loss of the aptamer in Co3(PO4)2@Apt nanocomposite. The two detection limits obtained are still much lower than or comparable with those of previously reported aptasensors. The Co3(PO4)2@BSA- and Co3(PO4)2@Apt-based aptasensors showed high selectivity, stability, and applicability for detecting the desired protein. This finding indicates that the Co3(PO4)2-based nanocomposites could be used as an electrochemical biosensor for various detection procedures in the biomedical field.
    No preview · Article · Dec 2015 · Biosensors & Bioelectronics
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    ABSTRACT: WO3 nanoparticle and flower-like WO3/graphene nanocomposite were successfully synthesized via a microwave-assisted hydrothermal method. The obtained samples were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscope techniques. The gas-sensing performance of the as-synthesized materials was also investigated. The experimental results revealed that the graphene plays an important role in the crystal structure evolution from WO3 nanoparticle to flower-like WO3/graphene nanocomposite. The flower-like WO3/graphene nanocomposite shows far better gas-sensing properties for aniline gas at 80 °C.
    No preview · Article · Nov 2015 · Journal of Materials Science Materials in Electronics
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    ABSTRACT: We reported a novel nanocomposite of cuprous oxide nanospheres, three-dimensional reduced graphene oxide, and nano-chitosan (Cu2O@3D-rGO@NCS) with diverse functionalities by a feasible one-step in situ reduction synthesis. The photocatalytic ability of Cu2O@3D-rGO@NCS nanocomposite using the degradation of rhodamine B (RhB) under simulated sunlight irradiation was accessed. The superior photocatalytic ability of Cu2O@3D-rGO@NCS compared to the pristine Cu2O nanospheres and Cu2O@3D-rGO nanocomposite, was attributed to high porosity from 3D-rGO, an efficient charge transfer from Cu2O to rGO, and high adsorption ability of NCS. The photodegradation efficiency toward rhodamine B (RhB) under simulated sunlight illumination was increased by approximately 68.2% and 46.8% when Cu2O@3D-rGO@NCS nanocomposite was used compared with the pristine Cu2O and Cu2O@3D-rGO nanocomposite, respectively. The recyclability results also demonstrated the excellent stability and reliability of the Cu2O@3D-rGO@NCS nanocomposite. The present work provides new insights into the synthesis and characterization of Cu2O@3D-rGO@NCS nanocomposite and its wide application in the environment protection issues.
    No preview · Article · Nov 2015 · Journal of Alloys and Compounds
  • Zhenxin Liu · Yingying Xue · Depeng Wu · Yu Xing · Shaoming Fang
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    ABSTRACT: Literature about water addition over AB2O4 spinel-supported cobalt CO hydrogenation catalysts is sparse. A comparative water addition experiment was conducted over Co/ZnAl2O4·Al2O3 catalyst. Water addition may cause lower C1 (i.e., CH4) hydrocarbon distribution, lower C2–C4 hydrocarbon distribution, higher C5+ hydrocarbon distribution and higher C2–C4 olefin/paraffin ratio than the control test without water addition. Possibly, as a product of Fischer–Tropsch synthesis, water might have an autocatalytic effect for the FTS process to generate longer chain hydrocarbons via its facilitation of C–C coupling. The Co/ZnAl2O4·Al2O3 catalyst exhibits good resistance against steam sintering. Graphical Abstract
    No preview · Article · Sep 2015 · Catalysis Letters
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    ABSTRACT: Three-dimensional nanocomposite of reduced oxide graphene (rGO) and Cu/Cu2O nanocrystal (3D Cu/Cu2O@rGO) was synthesized via a one-step low-temperature co-reduction method and further used as an electrochemical sensor for detecting ractopamine (RAC). In comparison with pristine Cu2O nanospheres and porous rGO, ractopamine antibody (RACanti) prefers to anchor onto the surface of 3D Cu/Cu2O@rGO nanocomposite because of its multi-functionality, which subsequently leads to more sensitive RAC detection. The developed electrochemical biosensor based on 3D Cu/Cu2O@rGO nanocomposite adsorbed with RACanti showed a low detection limit of 7.5 pg mL-1 within the range of 0.1 ng mL-1 to 10 ng mL-1 for detecting RAC. Furthermore, interference from other lean meat powders, urine components, and metal ions, such as salbutamol, clenbuterol hydrochloride, uric acid, urea, K+, Na+, Mg2+, and Ca2+, associated with RAC analysis can be effectively inhibited. The strategy offers a new pathway for rapid RAC analysis and shows a promising prospect in food safety.
    No preview · Article · Sep 2015
  • Zhenxin Liu · Yu Xing · Shaoming Fang · Xiongwei Qu
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    ABSTRACT: To the best of our knowledge, there is no single crystalline γ-MnOOH nanotube materials synthesized through one-step approach so far. A facile, one step route was developed to synthesize γ-MnOOH nanotubes. The structure and texture features of materials were analyzed by XRD and BET nitrogen sorption respectively, while the morphologies were characterized by FESEM. Electrochemical experiment results demonstrate that the γ-MnOOH nanotubes should be a good candidate as electrode material for supercapacitors.
    No preview · Article · Aug 2015 · Journal of Materials Science Materials in Electronics
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    ABSTRACT: Nanorod-like nanocomposite of three-dimensional reduced graphene oxide and polyaniline (3D-rGO@PANI) was synthesized via an in situ chemical oxidative polymerization method and was then used as the sensitive layer of a DNA adsorbent for detecting Hg2+ in aqueous solution. Amino-group-rich 3D-rGO@PANI exhibited high affinity toward the immobilization of T-rich DNA strands, which preferred to bind with Hg2+ to form THg2+T coordination. Electrochemical impedance spectroscopy was applied to determine the difference in the electrochemical performances during Hg2+ detection. The results demonstrated that the electrochemical biosensor based on 3D-rGO@PANI nanocomposite showed high sensitivity and selectivity toward Hg2+ within a concentration range from 0.1 nM to 100 nM with low detection limit of 0.035 nM. The proposed nanosensor could be applied for highly sensitive and selective determination of heavy metal ion in various environmental detections.
    No preview · Article · Jul 2015 · Sensors and Actuators B Chemical
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    ABSTRACT: Abstract We present a facile one-step solvothermal approach for in situ growth of ultradispersed nickel cobalt sulfide (NiCo2S4) nanoparticles on the graphene (GR) sheets without adding any surfactant. When acting as an electrochemical supercapacitor electrode material, the NiCo2S4@GR delivers a highly improved specific capacitance of 1708 F g-1 at a current density of 1.0 A g-1, compared with that of free NiCo2S4 (950 F g-1). The performances of NiCo2S4@GR electrode material can also be optimized by carefully tailoring the amount of each ingredient NiCo2S4 and GR in the nanocomposites. Asymmetric supercapacitor devices based on these NiCo2S4@GR nanocomposites and aqueous electrolyte showd a long-term cycling ability with a high-energy density (68.5 Wh kg-1 at 850.0 W kg-1) and a high-power density (17.0 kW kg-1 at 37.7 Wh kg-1), implying its great potential application in high-performance energy storage devices.
    No preview · Article · Jul 2015 · Electrochimica Acta
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    ABSTRACT: A composite made of polyacrylic acid and hollow TiO2 spheres (TiO2@PPAA) was prepared by the plasma polymerization method and subsequently used as an electrode material for detecting lysozyme. The chemical structure, surface morphology, and electrochemical performance of the TiO2@PPAA composite were mainly affected by the plasma input power used during plasma polymerization. After optimizing plasma conditions, aptamer strands exhibited high adsorption affinity toward the surface of TiO2@PPAA composite via synergistic effects between TiO2 and PPAA. Electrochemical impedance spectroscopy results showed that the developed TiO2@PPAA aptasensor presents highly sensitive detection ability toward lysozyme; the limit of detection of the proposed aptasensor is 0.015ngmL(-1) (1.04pM) within the range of 0.05-100ngmL(-1) in terms of 3σ value. The film further showed excellent selectivity toward lysozyme in the presence of interfering proteins, such as thrombin, bovine serum albumin, and immunoglobulin E. Thus, this aptasensing strategy might broaden the applications of plasma polymerized nanomaterials in the field of biomedical research and early clinical diagnosis. Copyright © 2015 Elsevier B.V. All rights reserved.
    No preview · Article · Jul 2015 · Biosensors & Bioelectronics
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    Shaoming Fang · Jigong Su · Guohao Wang · Likun Xue · Yonghui Zhang · Junping Du
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    ABSTRACT: Poly(2,7-N-dodecyl-carbazole)-co-(4,6-2,1,3-benzothiadiazole) (P1) was synthesized for the first time with Suzuki condensation polymerization by introducing 4,6-2,1,3-benzothiadiazole unit. The UV, PL spectra and cyclic voltammetry (CV) curve of P1 were tested. Compared with its 4,7-linked polymer HBC, the higher molecular weight Mn=12000 of P1 was obtained. The UV and PL spectrum shown that the maximum absorption wavelength and photoluminescence of P1 in toluene solution had blue shift about 78 and 43 nm, respectively. The optical bandgap and electrical bandgap increased about 0.35 and 0.40 eV, respectively while the shape of CV curves were similar. It suggested that the solubility of benzothiadiazole based polymer materials was improved effectively and the optoelectrical properties were tunable efficiently by introduction of 4,6-benzothiadiazole unit. It would supply a new method to realize multiple performance tunable of benzothiadaizole based polymer materials.
    Preview · Article · Jul 2015 · Chinese Journal of Organic Chemistry
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    ABSTRACT: A feasible method for different ZnO nanostructures fabrication via the O2 plasma surface modification was reported in the present work. After the as-prepared ZnO nanoparticles were dispersed in the aqueous solution of Na2CO3, the resultant nanomatter was treated by O2 plasma for different times at high plasma input power of 200 W. It shows different nanostructures of ZnO were observed, such as nanowire, nanosheet, nanoneedles, and nanoparticles. Also, the chemical and crystal performances of the resultant ZnO nanostructures were depended on the duration of plasma. On these bases, the formation mechanism of new nanostructured ZnO-related materials was discussed. In comparison with the pristine ZnO, the plasma modified ZnO nanostructures (p-ZnO) exhibited a relative high electrochemical performance and sensitivity toward the detection of ractopamine (RAC) with a detection limit of 1.18 ng mL−1 within the range of 5-500 ng mL−1. It hints that the p-ZnO nanostructure could be used as a new alternative electrochemical biosensor for the detection of the food additives.
    No preview · Article · Jul 2015 · Plasma Chemistry and Plasma Processing
  • Qingxian Jin · Jing Li · Li Zhang · Shaoming Fang · Minghua Liu
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    ABSTRACT: A series of simple ester molecules containing an isoxazole moiety were found to form instant organogels at room temperature in the presence of NaOH without the heating-cooling cycle used for conventional supramolecular gels. The gelation process was triggered due to the hydrolysis of the isoxazole esters and occurred selectively with Na+. When LiOH, NaOH and KOH were separately introduced into the methanol solutions of the isoxazole esters, the solution remained as a solution, transformed to a organogel and a crystal, respectively. With the help of a study on the phase behavior of the corresponding isoxazole acid in the presence of the alkali bases, it was revealed that π–π stacking of the isoxazole moiety and the ionic interaction between the carboxylates and Na+ are the main driving forces for the self-assembly and the organogelation. The size of the alkali metal ions will subtly affect the gelation, with the Li+ and K+ ions leading to solution and crystallization, respectively. These results have provided an insight into the balance between the solution, gelation and crystallization with subtle molecular variations.
    No preview · Article · Jun 2015 · CrystEngComm
  • Zhenxin Liu · Yu Xing · Shaoming Fang · Xiongwei Qu · Depeng Wu · Aiqin Zhang · Bei Xu
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    ABSTRACT: There is an intense need for development in the field of hierarchically structured functional materials owing to their outstanding and peculiar properties. Herein, we report the 3D Mn3O4 hierarchical architectures synthesized based on a self-assembly approach via a hydrothermal synthesis route at low temperature, which is sparse in literature. The synthesized Mn3O4 hierarchical architectures were characterized with XRD, FE-SEM, HRTEM/SAED, and FTIR. Electrochemical studies show that the Mn3O4 hierarchical architectures exhibit acceptable specific capacitance and excellent electrochemical stability, making them promising electrode materials in electrochemical capacitors.
    No preview · Article · Jun 2015 · RSC Advances
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    ABSTRACT: We report the production of a novel nanoflower material of Mn3(PO4)2@BSA hybrid which is made of both protein and manganese (II) phosphate, and its application as a new support material for platinum nanoparticles (PtNPs). The Mn3(PO4)2@BSA@PtNPs catalyst is synthesized using this new material. The average size of PtNPs on the Mn3(PO4)2@BSA nanoflower is approximately 2 nm. The obtained Mn3(PO4)2@BSA@PtNPs nanocomposites are characterized by X-ray diffraction, high resolution transmission electron microscopy, and scanning electron microscopy. Electrochemical results show that the Mn3(PO4)2@BSA@PtNPs catalyst also shows excellent electrocatalytic activity toward methanol oxidation with higher electrochemically active surface area. The microstructure of the supporting material serves a crucial function in the electrochemical performance of the Pt-based catalyst.
    No preview · Article · Jun 2015 · Journal of Power Sources
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    ABSTRACT: Ethephon is a plant growth regulator and often applied in the process of the fruits growth. It could result in considerable inhibition of cholinesterase in blood plasma and erythrocytes and is very harmful to human beings once excessive consumption. The nanocomposites from polyaniline and stannic oxide (SnO2@PANI) were synthesized and developed as the electrode material for detecting ethephon. Herein, SnO2 nanoparticles were prepared by the method of liquid phase precipitation. Afterwards, the as-prepared SnO2 nanoparticles were mixed with the aniline polymerization system to form the SnO2@PANI nanocomposite. The basic chemical components of the fabricated sensor were characterized in detail using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. It demonstrates that the developed SnO2@PANI nanocomposite exhibits good electrochemical performance with relatively low charge-transfer resistance. Compared with the pristine SnO2 and PANI, ethephon preferred to adsorb onto the SnO2@PANI nanocomposite surface because of the synergic interaction between two components of SnO2 and PANI. The electrochemical impedance spectra illustrated that the fabricated ethephon sensor had excellent sensitivity, with a detection limit of 4.76 pg/mL within the range from 0.01 to 5 ng/mL. Moreover, the developed electrochemical biosensor exhibits good selectivity and stability. All of these food performances provide a promising tool to detect the illegal food additives.
    No preview · Article · Jun 2015 · Analytical methods