Xiaoqiang Sun

Changzhou University, Wujin, Jiangsu Sheng, China

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Publications (50)49.23 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A straightforward strategy is designed for the fabrication of magnetically recyclable ternary titania–cobalt ferrite–polyaniline (P25-CoFe2O4-PANI) photocatalysts with differing P25/CoFe2O4 ratio. The pseudo-second-order and Langmuir models are found to be most suitable for describing the adsorption of methyl orange (MO) onto the photocatalysts. The photocatalytic activity of P25-CoFe2O4-PANI is evaluated by the degradation of various dyes under visible light irradiation, and the results show that the ternary P25-CoFe2O4-PANI photocatalyst exhibits high photocatalytic activity due to the good adsorption capacity of the hybrid and the introduction of P25, which can further improve the separation of the light-induced electron–hole pairs. The degradation of anionic dyes is much more effective than that of cationic dyes due to the negatively charged groups of anionic dyes undergo electrostatic attraction with the positively charged backbone of PANI, and such an effective adsorption helps in promoting the degradation.
    Industrial & Engineering Chemistry Research. 07/2013; 52(30):10105–10113.
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    ABSTRACT: We reported a facile co-precipitation method to prepare a highly active Fe3O4@graphene oxide (Fe3O4@GO) composite catalyst, which was fully characterized by means of X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and N2 adsorption–desorption measurements. The results demonstrated that the Fe3O4 nanoparticles (Fe3O4 NPs) with a small diameter of around 12 nm were densely and evenly deposited on the graphene oxide (GO) sheets. The as-prepared Fe3O4@GO composite was explored as a catalyst to reduce a series of nitroarenes for the first time, which exhibited a great activity with a turnover frequency (TOF) of 3.63 min−1, forty five times that of the commercial Fe3O4 NPs. The dosages of catalyst and hydrazine hydrate are both less than those reported. Furthermore, the composite catalyst can be easily recovered due to its magnetic separability and high stability.
    Materials Research Bulletin. 05/2013; 48(5):1885–1890.
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    ABSTRACT: Nucleophilic phosphine catalysis has proven to be a practical and powerful synthetic strategy in organic chemistry, which can provide easy access to five-, six-, seven-, and eight-membered nitrogen heterocyclic compounds. The reaction topologies can be controlled by a proper choice of the phosphine catalysts, as well as the functionalization of the reaction substrates. In many cases, the reactions take place smoothly at room temperature, with high efficiency and atom economy. This mini-review presents the recent advances in nucleophilic phosphine catalysis for the synthesis of drug-like nitrogen heterocylic compounds. The nitrogen heterocyclic compounds with significant biological activities derived from the library based on nucleophilic phosphine-catalyzed annulation reactions are also highlighted.
    Mini Reviews in Medicinal Chemistry 04/2013; · 2.87 Impact Factor
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    ABSTRACT: A switchable three-station rotaxane based molecular shuttle with phosphine oxide, dibenzylammonium, and urea functional groups has been developed, where the macrocycle can be easily switched between three different binding sites along the rotaxane thread by addition of acid/base or anions resulting in three stable states. Phosphine oxide is shown to be a potential recognition unit for rotaxane based molecular shuttles and plays an important role as one of three “stations”, allowing the design of a new class of molecular shuttles.
    Chemical Science 03/2013; 4(4):1701-1706. · 8.31 Impact Factor
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    ABSTRACT: The title compound, CHO, was obtained formyl-ation of 25,26,27,28-tetra-propoxycalix[4]arene with dichloro-methyl methyl ether and tin tetra-chloride. It adopts a pinched cone conformation, which leads to an open cavity. The two opposite aromatic rings bearing formyl groups are almost parallel, making a dihedral angle of 29.1 (2)°. The other pair of opposite rings are close to being perpendicular, making a dihedral angle of 73.6 (1)°. Adjacent rings are almost perpendicular, making dihedral angles of 78.8 (2), 81.6 (1), 78.2 (1) and 74.7 (1)°.
    Acta Crystallographica Section E Structure Reports Online 03/2013; 69(Pt 3):o424. · 0.35 Impact Factor
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    ABSTRACT: The reaction of anilines of type (I) with small amounts of FeCl3·6H2O allows a new and facile access to substituted 1,2-dihydroquinolines.
    ChemInform 02/2013; 44(6).
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    ABSTRACT: A facile chemical strategy was developed to anchor MnO2 nanoparticles on the surface of graphene sheet. Compared with literature, this approach requires neither extra pretreatment of acid functionalization of graphite nor any post-treatment for the conductivity compensation. Graphene sheet serves as both the nucleation center of the MnO2 nanoparticles and high-efficiency miniature current collectors, endowing an effective rise in electrochemical performance of the overall system. Meanwhile, few layers graphene restrain the aggregation of MnO2 nanoparticles and act as template for the "sandwich structure," which boosts accessible surface areas for the high rates charge and discharge processes. The internal resistance drops of the electrode were small, which is propitious to the high discharge delivery. And the nanocomposite with the unique structure displayed a specific capacitance as high as 340.5 F g(-1). Moreover, the capacitance decrease was only 3.7% after 1000 cycles.
    Journal of Nanoscience and Nanotechnology 01/2013; 13(1):487-92. · 1.15 Impact Factor
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    ABSTRACT: Multiple valence silver nanoparticles with irregular shape were anchored on reduced graphene oxide sheets by light irradiation. The characterization analysis revealed silver nanoparticles with different valences were uniformly attached on the surface of reduced graphene oxide sheets and mostly in the size of 30 nm. The antibacterial activities of the as-obtained nanocomposite against gram-negative bacteria E. coli and gram-positive bacteria S. aureus were investigated. Moreover, stability of the nanocomposite was measured by silver ion release. It was found that the nanocomposite has enhanced antibacterial activity and outstanding stability, which makes it a potential antibacterial agent.
    Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 01/2013; 43(4). · 0.50 Impact Factor
  • Yongsheng Fu, Haiqun Chen, Xiaoqiang Sun, Xin Wang
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    ABSTRACT: A straightforward strategy is designed for the fabrication of a magnetically separable NiFe2O4-graphene photocatalyst with different graphene content. It is very interesting that the combination of NiFe2O4 nanoparticles with graphene sheets results in a dramatic conversion of the inert NiFe2O4 into a highly active catalyst for the degradation of methylene blue (MB) under visible light irradiation. The significant enhancement in photoactivity under visible light irradiation can be ascribed to the reduction of GO, because the photogenerated electrons of NiFe2O4 can transfer easily from the conduction band to the reduced GO, effectively preventing a direct recombination of electrons and holes. The results of the kinetic study indicated that the rate-determining stage is the adsorption process of MB molecules. NiFe2O4 nanoparticles themselves have a strong magnetic property, which can be used for magnetic separation in a suspension system, and, therefore, the introduction of additional magnetic supports is no longer necessary. © 2011 American Institute of Chemical Engineers AIChE J, 2012
    AIChE Journal 11/2012; 58(11). · 2.58 Impact Factor
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    ABSTRACT: A straightforward strategy is designed for the fabrication of CuFe2O4-graphene heteroarchitecture via a one-step hydrothermal route to allow multifunctional properties, i.e., magnetic cycling, high photocatalytic activity under visible light irradiation, and excellent electrochemical behaviors for use as the anode in lithium-ion batteries (LIBs). Transmission electron microscopy (TEM) observations indicate that graphene sheets are exfoliated and decorated with hexagonal CuFe2O4 nanoflakes. The photocatalytic activity measurements demonstrate that the combination of CuFe2O4 and graphene results in a dramatic conversion of the inert CuFe2O4 into a highly active catalyst for the degradation of methylene blue (MB) under visible light irradiation. CuFe2O4 nanoparticles themselves have excellent magnetic properties, which makes the CuFe2O4-graphene heteroarchitecture magnetically recyclable in a suspension system. It should be pointed out that the CuFe2O4-graphene (with 25 wt % graphene) heteroarchitecture as anode material for LIBs shows a high specific reversible capacity up to 1165 mAh g–1 with good cycling stability and rate capability. The superior photocatalytic activity and electrochemical performance of the CuFe2O4-graphene nanocomposite can be attributed to its unique heteroarchitechture, which provides the remarkable synergistic effect between the CuFe2O4 nanoflakes and the graphene sheets.
    Industrial & Engineering Chemistry Research 08/2012; 51(36):11700–11709. · 2.24 Impact Factor
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    ABSTRACT: A facile and efficient method to synthesize 2- or 4-substituted 1,2-dihydroquinolines and quinolines catalyzed by FeCl(3)·6H(2)O (2 mol %) was described. The iron-catalyzed intramolecular allylic amination of 2-aminophenyl-1-en-3-ols proceeded smoothly to afford 13 1,2-dihydroquinoline and 8 quinoline derivatives under mild reaction conditions with good to excellent yields (up to 96%).
    The Journal of Organic Chemistry 08/2012; 77(19):8615-20. · 4.56 Impact Factor
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    ABSTRACT: A cobalt ferrite–polyaniline photocatalyst is successfully prepared by in situ oxidative polymerization. The excellent magnetic properties of CoFe2O4 are maintained in the composite to some extent, and therefore the photocatalyst can be separated easily by an external magnetic field. A significant adsorption can be observed in the case of the anionic dyes and neutral dyes because the negatively charged groups or the electron-rich groups of these dyes undergo chemical interactions with the positively charged backbone of polyaniline (PANI). Such an adsorption helps in promoting the photodegradation of the dyes. It is interesting that although CoFe2O4 alone is an inactive visible-light-driven photocatalyst, the combination of CoFe2O4 nanoparticles with PANI leads to high photocatalytic activity for the degradation of the dyes under visible light irradiation. The dramatic enhancement in photoactivity can be attributed to the excited state electrons in PANI which can migrate to the conduction band (CB) of CoFe2O4, and the photogenerated holes in the valence band (VB) of CoFe2O4 which can directly transfer to the HOMO of PANI, effectively preventing a direct recombination of electrons and holes. Due to electrostatic repulsion, the cationic dyes containing positively charged groups cannot easily gain access to the positively charged backbone of PANI, giving very low photodegradation rates.
    Journal of Materials Chemistry 08/2012; 22(34):17485-17493. · 5.97 Impact Factor
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    ABSTRACT: In the title compound, C(24)H(28)N(2)O(4), the dioxalane ring has an envelope conformation. The cyclo-hexane ring adopts a chair conformation. The dihedral angle between the benzene rings is 72.5 (3)°. The mol-ecular conformation is stabilized by two intra-molecular O-H⋯N hydrogen-bonding inter-actions with an S(6) graph-set motif. The crystal structure is stabilized by van der Waals inter-actions.
    Acta Crystallographica Section E Structure Reports Online 07/2012; 68(Pt 7):o2296. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(14)H(7)FN(2)OS, prepared by the reaction of 2-bromo-4-fluoro-benzoyl choride with 2-mercaptobenzimidazole, the four-membered fused-ring system is essentially planar [maximum deviation from the mean plane = 0.035 (2) Å]. The crystal packing is stabilized by weak inter-molecular π-π [minimum ring centroid-centroid separation = 3.509 (7) Å], weak C-F⋯π [F⋯centroid = 3.4464 (17) Å, C-F⋯centroid = 97.72 (11)°] and C-O⋯π [O⋯centroid = 3.5230 (16) and 3.7296 (17) Å, C-O⋯centroid = 86.40 (10) and 86.25 (10)°] inter-actions and weak inter-molecular C-H⋯N hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 02/2012; 68(Pt 2):o390. · 0.35 Impact Factor
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    Yan Jiang, Jing Bian, Xiaoqiang Sun
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    ABSTRACT: In the title compound, C(17)H(20)N(2)O(2)S(2), the five-membered heterocycle exhibits an envelope conformation and the mol-ecular chirality and configuration are well preserved from l-tartaric acid. The dihedral angle between the two thio-phene rings is 17.0 (2)°. In the crystal, mol-ecules are linked by C-H⋯O and C-H⋯S hydrogen inter-actions, which are effective in the stabilization of the crystal structure.
    Acta Crystallographica Section E Structure Reports Online 02/2012; 68(Pt 2):o430. · 0.35 Impact Factor
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    ABSTRACT: A simple and straightforward strategy was developed to fabricate magnetically separable MnFe2O4–graphene photocatalysts with differing graphene content. It was found that graphene sheets were fully exfoliated and decorated with MnFe2O4 nanocrystals having an average diameter of 5.65 nm and a narrow particle size distribution. It is very interesting that, although MnFe2O4 alone is photocatalytically inactive under visible light irradiation, the combination of MnFe2O4 nanoparticles with graphene sheets leads to high photocatalytic activity for the degradation of methylene blue under visible light irradiation. The strong magnetic property of MnFe2O4 nanoparticles can be used for magnetic separation in a suspension system, and therefore it does not require additional magnetic components as is the usual case. Consequently, the MnFe2O4–graphene system becomes a dual function photocatalyst. The significant enhancement in photoactivity under visible light irradiation can be ascribed to the reduction of graphene oxide (GO), because the photogenerated electrons of MnFe2O4 can transfer easily from the conduction band to the reduced GO, effectively preventing a direct recombination of electrons and holes. Hydroxyl radicals play the role of main oxidant in the MnFe2O4–graphene system, and the radicals’ oxidation reaction is obviously dominant.
    Industrial & Engineering Chemistry Research. 01/2012; 51(2):725–731.
  • Yongsheng Fu, Xiaoqiang Sun, Xin Wang
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    ABSTRACT: A BiVO4–graphene photocatalyst was prepared by a facile one-step hydrothermal method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectra (XPS), and transmission electron microscopy (TEM) techniques. The results show that the graphene sheets in this catalyst are exfoliated and decorated by leaf-like BiVO4 lamellas. In comparison with the pure BiVO4 catalyst, the BiVO4–graphene system reveals much higher photocatalytic activity for degradation of methyl orange (MO), methylene blue (MB), Rhodamine B (RhB) and active black BL-G in water under visible light irradiation due to the concerted effects of BiVO4 and graphene sheets or their integrated properties.
    Materials Chemistry and Physics - MATER CHEM PHYS. 12/2011;
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    ABSTRACT: In the title compound, C(15)H(10)N(2)OS, prepared by the reaction of 2-iodo-5-methyl-benzoyl chloride with 2-mercaptobenzimidazole, the four-membered fused-ring system is essentially planar [maximum deviation from the least-squares plane = 0.137 (6) Å]. The crystal packing is stabilized by weak inter-molecular π-π inter-actions [minimum ring centroid separation = 3.536 (4) Å] and weak C-H⋯π inter-actions.
    Acta Crystallographica Section E Structure Reports Online 12/2011; 67(Pt 12):o3506. · 0.35 Impact Factor
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    ABSTRACT: A new and efficient cascade synthesis of polycyclic fused imidazo[2,1-b][1,3]thiazinones has been developed. This protocol includes an intermolecular N-acylation followed by a copper-catalyzed intramolecular CS coupling reaction. The methodology is applied to a wide range of 2-iodo, 2-bromo, and 2-chloro benzoyl chlorides to yield the polycyclic fused imidazo[2,1-b][1,3]thiazinones in good to excellent yields.
    Chinese Journal of Chemistry 12/2011; 29(12). · 0.92 Impact Factor
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    ABSTRACT: A new and efficient cascade synthesis of indazolo[2,1-a]indazole-6,12-diones has been developed. This protocol includes an intermolecular N-acylation followed by a copper-catalyzed intramolecular CN coupling reaction. The methodology is applied to a wide range of 2-bromo and 2-chloro benzoyl chlorides to yield the indazolo-[2,1-a]indazole-6,12-diones in good to excellent yields with high regioselectivities.
    Chinese Journal of Chemistry 12/2011; 29(12). · 0.92 Impact Factor

Publication Stats

40 Citations
49.23 Total Impact Points

Institutions

  • 2010–2013
    • Changzhou University
      Wujin, Jiangsu Sheng, China
  • 2003–2005
    • Jiangsu Polytechnic university
      Wujin, Jiangsu Sheng, China
    • Jiangsu Institute of petrochemical Technology
      Wujin, Jiangsu Sheng, China
  • 2000
    • Changzhou Institute of Technology
      Wujin, Jiangsu Sheng, China