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Han S.,Harbin Institute of Technology | Han S.,Qiqihar University | Li X.,Harbin Institute of Technology | Wang Y.,Qiqihar Environmental Monitoring Central Station | Su C.,Qiqihar University
Analytical Methods | Year: 2014

In this work, magnetic fluorescence molecularly imprinted microspheres were prepared for recognition and separation of 4-nonylphenol. The prepared composite was evaluated and characterized in detail by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, fluorescence spectroscopy, fluorescence microscopy, vibrating sample magnetometry, and X-ray diffraction analyses. The results showed that the composite exhibited a uniform spherical shape and a core-shell structure. Moreover, this hybrid had a saturation magnetization value of 4.79 emu g -1, which provided an efficient way to separate toxic pollutants from extreme environments. And, the hybrid had the recognition ability for 4-nonylphenol by the changes of fluorescence signals, owning to the intrinsic fluorescent properties. Furthermore, the imprinting factor (IF) reached 2.37, which proved that many specific recognition sites with respect to the template were generated on the surface of MIPs and outstanding binding affinity and recognition selectivity towards 4-nonylphenol over competitive phenolic compounds. © The Royal Society of Chemistry 2014.


Han S.,Harbin Institute of Technology | Han S.,Qiqihar University | Li X.,Harbin Institute of Technology | Wang Y.,Qiqihar Environmental Monitoring Central Station | Chen S.,Harbin Institute of Technology
RSC Advances | Year: 2015

In this work, multifunctional molecularly imprinted polymers (MIPs) based on CdTe quantum dots (QDs) and graphene oxide (GO) were prepared for selective recognition and separation of 2,4,6-trichlorophenol (2,4,6-TCP). GO was used to improve the adsorption capacity and sensing rate of MIPs. CdTe QDs offered a readout signal to monitor the amount of 2,4,6-TCP bound to the imprinted matrix. The molecularly imprinted shell provided analyte selectivity. The prepared composite was evaluated and characterized by scanning electron microscopy, transmission electron microscopy, fluorescence spectroscopy, fluorescence microscopy, Raman spectroscopy, thermo gravimetric analysis, and X-ray diffraction analysis. MIPs were successfully applied to direct fluorescence quantification of 2,4,6-TCP. The linear relationship was from 0.2 to 40 μmol L-1, with a detection limit of 0.18 μmol L-1 which provided a simple and selective sensing system for recognition of 2,4,6-TCP. Moreover, a molecularly imprinted solid phase extraction (MISPE) method followed by high performance liquid chromatography (HPLC) for detection of 2,4,6-TCP was also established. The linear relationship was from 0.02 to 2.5 μmol L-1 with a detection limit of 0.25 ng mL-1, which was more suitable to determine trace 2,4,6-TCP. This journal is © 2015 The Royal Society of Chemistry.


Han S.,Harbin Institute of Technology | Han S.,Qiqihar University | Li X.,Harbin Institute of Technology | Wang Y.,Qiqihar Environmental Monitoring Central Station | Chen S.,Harbin Institute of Technology
Chemical Engineering Journal | Year: 2015

In this work, a new kind of molecularly imprinted polymers (MIPs) based on CdTe/CdS quantum dots (QDs), magnetic Fe3O4 and graphene oxide (GO) was prepared for selective recognition and separation of p-t-octylphenol (OP). GO was used to increase sensing rate and adsorption capacity, while magnetic Fe3O4 can facilitate the separation of MIPs at the end of their adsorption. Moreover, CdTe/CdS QDs offered readout signal to monitor the amount of OP bound to the imprinted matrix and evaluate the efficiency of imprinting. The molecularly imprinted film provided analyte selectivity. The prepared composite was evaluated and characterized in detail by scanning electron microscope, transmission electron microscopy, fluorescence spectroscopy, fluorescence microscopy, vibrating sample magnetometer, and X-ray diffraction analysis. This hybrid had a Ms value of 5.52emug- 1, which provided an efficient way to separate toxic pollutants from extreme environments. The relative fluorescence intensity of MIPs decreased linearly with increasing concentration of OP in the range of 0.5-35μmolL-1 with a detection limit of 0.15μmolL-1, which formed a simple and selective sensing system for recognition of OP. The MIPs was also used as solid-phase extraction (SPE) sorbent, followed by ultra performance liquid chromatography (UPLC) analysis, which might offer a novel method for the enrichment and determination of trace OP in water samples. © 2015 Elsevier B.V.


Han S.,Harbin Institute of Technology | Han S.,Qiqihar University | Li X.,Harbin Institute of Technology | Wang Y.,Qiqihar Environmental Monitoring Central Station
Science of Advanced Materials | Year: 2015

In this work, a magnetic graphene oxide-based molecularly imprinted polymers (GO-Fe3O4-MIPs) was prepared for selectivity recognition and separation of diethylstilbestrol (DES). The prepared composite was evaluated and characterized in detail by transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectra, and vibrating sample magnetometer analysis. The results showed that this hybrid had a saturation magnetization value of 5.60 emu g-1, which provided an efficient way to separate toxic pollutants from extreme environments. Batch mode adsorption showed the Langmuir isotherm model and the pseudo-second-order equation were well fitted to the adsorption of GO-Fe3O4-MIPs hybrids. The selectivity recognition experiments demonstrated the GO-Fe3O4-MIPs possessed excellent adsorption capacity for DES (2183 μmol g-1 at 298 K), and outstanding selectivity for DES over the other competitive compounds. © 2015 by American Scientific Publishers.


Han Z.-Q.,Qiqihar University | Wang Y.,Qiqihar Environmental Monitoring Central Station | Han S.,Qiqihar University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The ZnII atom in the title compound, [ZnCl2(C 13H20N2O2)], is four-coordinated by the imine N and phenolate O atoms of the zwitterionic Schiff base ligand, and by two choride ions in a distorted tetra-hedral coordination. In the crystal structure, mol-ecules are linked through inter-molecular N - H⋯O and N - H⋯Cl hydrogen bonds along [010].


Han Z.-Q.,Qiqihar University | Han S.,Qiqihar University | Wang Y.,Qiqihar Environmental Monitoring Central Station
Acta Chimica Slovenica | Year: 2016

Reaction of VO(acac)2 with N'-(3-bromo-5-chloro-2-hydroxybenzylidene)-3-methylbenzohydrazide (H2L) in methanol afforded a new mononuclear vanadium(V) complex, [VOL(OMe)(MeOH)]. Structure of the complex has been characterized by physico-chemical methods and single-crystal X-ray diffraction. The complex crystallizes as the monoclinic space group P21/c, with unit cell dimensions a = 13.1345(10) Å, b = 18.6279(14) Å, c = 7.8983(8) Å, β = 90.248(2)°, V = 1932.4(3) Å3, Z = 4, R1 = 0.0963, wR2 = 0.2213, S = 1.113. X-ray analysis indicated that the V atom in the complex is in octahedral coordination. The insulin-like activity of the complex was studied, which can stimulate glucose uptake with 2-DOG uptake value of 0.81 nmol/3 min.


Han S.,Qiqihar University | Wang Y.,Qiqihar Environmental Monitoring Central Station
Journal of Structural Chemistry | Year: 2015

Vanadium complexes have been proved to possess an interesting insulin-like activity. The reaction of VO(acac)2 with N′-(3,5-dichloro-2-hydroxybenzylidene)-2-methylbenzohydrazide (H2L) in methanol affords a new mononuclear vanadium (V) complex [VOL(OMe)(MeOH)]. The structure of the complex is characterized by physicochemical methods and single crystal X-ray diffraction. The complex crystallizes as the monoclinic space group P21/n, with unit cell parameters a = 7.830(2) Å, b = 23.225(3) Å, c = 10.635(2) Å, β = 101.947(2)°, V = 1892.1(6) Å3, Z = 4, R 1 = 0.0404, wR 2 = 0.0953, S = 1.037. The X-ray analysis indicates that the V atom in the complex is in the octahedral coordination. The insulin-like activity of the complex is studied. © 2015 Pleiades Publishing, Ltd.


Han S.,Qiqihar University | Wang Y.,Qiqihar Environmental Monitoring Central Station
Journal of the Chilean Chemical Society | Year: 2015

Two new square planar mononuclear copper(II) complexes, [CuL1] (1) and [CuL2(NCS)] (2), where L1 is the dianionic form of the bis-Schiff base N,N'- bis(2-hydroxynaphthylmethylidene)-1,3-pentanediamine (H2L1), and L2 is the monoanionic form of 1-[(2-diethylaminoethylimino)methyl]naphthalen-2-ol (HL2), have been synthesized and characterized by physico-chemical methods and single-crystal X-ray diffraction. Complex (1) (C27H24CuN2O2) crystallizes as the orthorhombic space group Pbca, with unit cell dimensions a = 18.284(1) Å, b = 12.2373(7) Å, c = 19.775(1) Å, V = 4424.6(4) Å3, Z = 8, R1 = 0.0421, wR2 = 0.0975, S = 1.054. Complex (2) (C18H21CuN3OS) crystallizes as the monoclinic space group P21/c, with unit cell dimensions a = 12.776(1) Å, b = 24.181(2) Å, c = 11.743(1) Å, β = 98.621(1)?, V = 3586.7(7) Å3, Z = 8, R1 = 0.0520, wR2 = 0.1183, S = 1.012. X-ray analysis indicates that the Cu atoms in the complexes are in square planar coordination. The complexes were evaluated for their catalytic oxidation of cyclooctene and styrene with tert-butylhydroperoxide.

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