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Shaoguan, China

Liang K.,Shaoguan College | Liu Q.,Hunan University of Science and Technology | Ding Y.,Hunan University of Science and Technology
Polymers and Polymer Composites | Year: 2014

Porous magnetic polymer microspheres (PMPMs) were used as an adsorbent to removal of methyl violet (MV) from wastewater. Ethanol/water co-solvent mixtures in combination with various inorganic salts were used as eluents to regenerate PMPMs. The desorption capacity of the eluents were systematically investigated. The results showed that when ethanol/water co-solvents were used as the eluent, the desorption efficiency increased with the ethanol concentration. Incorporation of inorganic salts into the co-solvents greatly improved the desorption efficiency of the eluents. Among the eluents, a mixture of ethanol/water (8/2, v/v) in combination with 0.1M KCl exhibited excellent ability for recovering cationic dyes and regenerating PMPMs, which was again demonstrated during treatment of wastewater containing cationic golden yellow. Furthermore, the adsorption kinetics of methyl violet by PMPMs was also studied. It was found that the adsorption capacity depended on the initial concentration of dyes, and the pseudo-second-order model was more suitable to describe adsorption kinetics of methyl violet than the pseudo-first-order model. © 2014 Smithers Information Ltd.

Zhang X.,South China University of Technology | Qi J.-R.,South China University of Technology | Li K.-K.,South China University of Technology | Yin S.-W.,South China University of Technology | And 3 more authors.
Food Research International | Year: 2012

The conjugation reaction between soy β-conglycinin and dextran via Maillard reaction in crowded liquid system was studied. Apparent viscosity indicated that environment became more and more crowded with the increase of dextran concentration. The covalently linked conjugate was produced by incubating aqueous solution containing soy β-conglycinin and dextran at pH. 7.0 and 95 °C for 6 h. Free amino group content and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) profile showed that soy β-conglycinin-dextran conjugate was successfully formed and macromolecular crowding enhanced the extent of glycation. The results of atomic force microscopy indicated that glycation inhibited the thermal aggregate of protein. Meanwhile, the tertiary structure of protein in conjugate changed with increasing number of aromatic side-chains exposed in heating environment. All data showed that the introduction of macromolecular crowding in soy β-conglycinin-dextran conjugate was an effective and promising method for linking polysaccharides to proteins. © 2012 Elsevier Ltd.

Kai L.,Shaoguan College | Qingquan L.,Hunan University of Science and Technology
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2015

Hydroxyl-functionalized polystyrene (HFPS) microspheres were prepared by the copolymerization of styrene (St) and hydroxyethyl acrylate (HEA) via dispersion polymerization in the absence of steric stabilizers. The copolymerization was conducted with V-50 as an initiator. The effect of initiator concentration, HEA amount, and medium composition on the average diameters and coefficient variations of HFPS microspheres were systematically investigated. The particle morphology, the average diameters, the surface N content, and the particle size distribution curves were measured by SEM, XPS, and laser particle size analyzer. The results indicated that monodisperse HFPS microspheres with diameter of 0.6-1.0 m could be successfully generated by dispersion polymerization of St and HEA without steric stabilizers. Therefore, overall, the present manuscript provided a simple route to generate monodisperse hydroxyl-functionalized polymer microspheres. © 2015 Taylor & Francis Group, LLC.

Zhang S.,Shaoguan College | Huang Z.,Sun Yat Sen University | Gu L.,Sun Yat Sen University
Chinese Journal of Organic Chemistry | Year: 2010

Five benzoxazolo[3,2-a]pyridinium zwitterions were synthesized through the reaction of 4-hydroxycoumarins with p-benzoquinone and 2-methoxypyridine in aqueous acetone (V: V= 1:1) at room temperature. The structures of these compounds were determined by MS, 1H NMR techniques and elemental analysis.

Liang K.,Shaoguan College | Tang L.-Y.,Jiangsu University | Li G.-H.,Zhejiang University of Technology
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2011

TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposite were fabricated by a hydrolysis- precipitation approach, using TiCl4 as precursor, α-Fe2O3 and α-FeOOH as supports. The crystal phase, diameter of crystallite and morphology of the samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM). The results indicated that the crystal phases of TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposites were composed of α-Fe2O3 and rutile, α-FeOOH and anatase, respectively; Granular titania particles form a thin layer with a thickness of 5-20 nm on the surface of α-Fe2O3, and act as a shell on the surface of α-Fe2O3. TiO2/α-FeOOH is a kind of core-shell structure too, needle-like TiO2 particles aggregate around α-FeOOH core, and act as a shell with a thickness of 100-150 nm on the surface of α-FeOOH. The photocatalytic activity of the samples were evaluated by UV-vis spectrum and photo-degradation of MO under tungsten lamp irradiation. The results indicated that a synergistic effect existes between α-Fe2O3, α-FeOOH and TiO2 in the nanocomposite.

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