Xiaoqiang Sun

Changzhou University, Wujin, Jiangsu Sheng, China

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Publications (33)31.35 Total impact

  • [show abstract] [hide abstract]
    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: 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: 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
  • 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). · 2.49 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
  • 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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    Yuan Qin, Haitao Xi, Liang Chen, Xiaoqiang Sun
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    ABSTRACT: The title compound, C(10)H(9)F(3)N(2)O(2), was prepared by the reaction of m-phenyl-enediamine and ethyl 4,4,4-trifluoro-acetoacetate. In the crystal, inter-molecular C-H⋯ F, N-H⋯F, O-H⋯N and N-H⋯O inter-actions contribute to the crystal packing.
    Acta Crystallographica Section E Structure Reports Online 10/2011; 67(Pt 10):o2616. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(19)H(18)Cl(2)O(4), the two non-planar six-membered heterocycles passing through the spiro-C atom both adopt chair conformations, and the dihedral angle between the two benzene rings is 7.2 (1)°. In the crystal, the enanti-omers with R and S configurations are generated by the symmetry elements of the centrosymmetric space group, forming a racemic crystal. Inter-molecular C-H⋯π and weak C-H⋯O inter-actions link the mol-ecules in the crystal structure.
    Acta Crystallographica Section E Structure Reports Online 10/2011; 67(Pt 10):o2672. · 0.35 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The synthesis of graphene paper with controllable properties via chemical reduction of exfoliated grapheneoxides was investigated. UV-Visabsorption spectra, elemental analysis, FT-IR spectra, X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), mechanical analysis, electrical conductivity and cyclic voltammetry (CV) measurements were applied to the characterization. It was proven that different reduction levels of grapheneoxides can significantly alter the thermal, mechanical and electrical properties of the corresponding chemically reduced graphene (CRG) paper. Moreover, UV-vis spectrometry was found to be a valid and facile method to monitor and control the reduction level of CRG, and furthermore to fine tune these properties, which may pave the way for large scale fabrication of graphene-based nanomaterials.
    Journal of Materials Chemistry 09/2011; 21(38):14631-14638. · 5.97 Impact Factor
  • Yongsheng Fu, Haiqun Chen, Xiaoqiang Sun, Xin Wang
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    ABSTRACT: A straightforward strategy was designed for the fabrication of magnetically separable CoFe2O4-graphene photocatalysts with differing graphene content. It is very interesting that the combination of CoFe2O4 nanoparticles with graphene results in a dramatic conversion of the inert CoFe2O4 into a highly active catalyst for the degradation of methylene blue (MB), Rhodamine B (RhB), methyl orange (MO), active black BL-G and active red RGB under visible-light irradiation. The significant enhancement in photoactivity under visible-light irradiation can be ascribed to reduction of graphene oxide, because the photogenerated electrons of CoFe2O4 can transfer easily from the conduction band to the reduced graphene oxide, effectively preventing a direct recombination of electrons and holes. Hydroxyl radicals play the role of main oxidant in the CoFe2O4-graphene system and the radicals’ oxidation reaction is obviously dominant. CoFe2O4 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.
    Applied Catalysis B-environmental - APPL CATAL B-ENVIRON. 01/2011;
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    Xiaoqiang Sun, Liang Chen, Yan Jiang, Zhengyi Li
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    ABSTRACT: In the title compound, C(31)H(28)O(4), the asymmetric unit contains two crystallographically independent mol-ecules. In these two mol-ecules, the four dihedral angles between each pair of phenyl rings on the same C atoms are 75.4 (1), 83.0 (1), 85.0 (1) and 80.4 (2)°. All of the nonplanar six-membered heterocycles adopt chair conformations. Inter-molecular C-H⋯π and weak C-H⋯O inter-actions link the mol-ecules and are effective in the stabilization of the crystal structure.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 11):o3035. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(19)H(16)Cl(4)O(4), the two halves of the mol-ecule are related by a crystallographic twofold rotation axis passing through the central spiro-C atom. The two non-planar six-membered heterocycles both adopt chair conformations, and the dihedral angle between the two benzene rings is 76.6 (1)°. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains along the c axis.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 7):o1864. · 0.35 Impact Factor
  • Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2010; 66(7).
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    ABSTRACT: The title compound, C(15)H(28)O(4), was prepared by the condensation of pivalaldehyde with penta-erythritol. In the crystal, the two halves of the mol-ecule are related by a crystallographic twofold rotation axis passing through the central spiro-C atom. The two non-planar six-membered heterocycles both adopt chair conformations with the two tert-butyl groups both located in the equatorial positions.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 12):o3368. · 0.35 Impact Factor
  • Chemistry Letters - CHEM LETT. 01/2010; 39(4):415-417.
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    ABSTRACT: The title mol-ecule, C(14)H(18)Cl(4), possesses a crystallographically imposed inversion centre, which coincides with the centre of benzene ring. In the absence of classical inter-molecular inter-actions, van der Waals forces help the mol-ecules to pack in the crystal.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 3):o473. · 0.35 Impact Factor
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    Zhengyi Li, Dinghao Yuan, Haitao Xi, Xiaoqiang Sun
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    ABSTRACT: The title compound, C(60)H(88)O(4)·4CHCl(3)·2H(2)O, is the alkyl-ated product of 5,11,17,23-tetra-tert-butyl-calix[4]arene. It adopts a distorted cone conformation which leads to an open cavity. All the phenolic rings are tilted so that their tert-butyl groups are pitched away from the calix cavity. Two opposite aromatic rings are close to being perpendicular to one another [dihedral angle 85.0 (2)°], while the other pair of opposite rings is almost parallel [dihedral angle 8.1 (2)°], and adjacent phenolic rings are almost perpendicular [dihedral angles 82.4 (1) or 87.9 (1)°]. In the crystal, the water molecule and calixarene interact by way of O-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 7):o1697. · 0.35 Impact Factor
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    ABSTRACT: K4Ce2Nb10O30 ultrafine powders were prepared by stearic acid method (SAM). The obtained products were analyzed by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy and UV-visible absorption spectra. XRD patterns revealed that K4Ce2Nb10O30 powders treated at 900 °C for 2 h presented tetragonal structure without the presence of deleterious phases. Furthermore, the K4Ce2Nb10O30 prepared by SAM had considerable activity under visible light irradiation.
    Journal of Rare Earths - J RARE EARTH. 01/2009; 27(5):811-814.
  • Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2009; 65(3).