Yue Chang

Sorption of p-nitrophenol by anion-cation modified palygorskite.

A series of anion-cation modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR. Compared with natural palygorskite, the p-nitrophenol sorption capacity with anion-cation modified palygorskite was significantly improved. The maximum sorption capacity (137.74 mg g(-1)) was obtained with the mass ratio 1:4 and 3:10 of hexadecyltrimethylammonium bromide to sodium dodecyl sulfate and the surfactant to palygorskite of at 313 K. The sorption equilibrium was in accordance with the Langmuir isothermal sorption equations. Thermodynamic function calculated showed that the sorption was a spontaneous and exothermic process. Free energy of the sorption increased with the increase of the temperature. The sorption of p-nitrophenol followed the pseudo-second-order process (sorption rate constant: 0.00453 mg(-1)min(-1)).

Oxidation of Styrene with Molecular Oxygen Catalyzed by Polymer‐Supported O‐Aminobenzoic Acid Salicylaldehyde Schiff‐Base Copper(II) Complex

Schiff‐base complexes of copper supported on chloromethylated polystyrene as a catalyst have been studied in the oxidation of styrene with molecular oxygen. The main products are benzaldehyde and the epoxide of styrene. Compared with the unsupported copper complex, the polymer supported complex has more effective catalytic activity, and could be easily separated and reused. The influences of reaction temperature and the amount of catalyst have also been investigated.

Preparation and catalytic activity of polymer-bound 1,10-phenanthroline and its complexes

Abstract Polymer-bound 1,10-phenanthroline (PS-phen) has been prepared by reaction of chloromethylated polystyrene with 5-amino-1,10-phenanthroline. The polymer-bound ligand and its complexes (PS-phenFephen) were characterized by IR spectroscopy and XPS. The polymer bound ferric complexes, which are N , N , N , N -type complexes, show high catalytic selectivity in the oxidation of substituted benzene.

Study on oxidation mechanism of cumene based on GC-MS analysis

Based on the gas chromatography (GC) and gas chromatography mass spectrometry (GC-MS) spectra, the analysis of the products of the catalytic oxidation and its mechanism can be elucidated. Here, the analysis of the aerobic oxidation products of cumene catalyzed by the polymer ferric complex through GC-MS has been performed. The main products are 2-phenyl-2-propanol (PP), 2-phenyl-2-iso-propyl hydroperoxide. From the analysis, the radical reaction mechanism was presumed. The relationship between the selectivity of cumene hydroperoxide and PP has been studied.

Preparation and adsorption property of chitosan derivative bearing β-cyclodextrin and schiff-base

Chitosan derivative bearing β‐cyclodextrin and Schiff‐base was prepared by modification of chitosan with glutaric diketone, followed by reaction with epichlorohydrin and β‐cyclodextrin. The derivative was characterized by IR and XRD spectra. Adsorption property of the chitosan derivative was investigated. It can adsorb metallic ions and phenolic compounds simultaneously.

Oxidation of Cyclohexene with Oxygen Catalyzed by Supported Dinuclear Schiff-Base Complex

Oxidation of cyclohexene, using chloromethylated polystyrene supported dinuclear Schiff-base complexes (PS-DD-M, where M= Cu2+, Co2+, Ni2+ and Mn2+, respectively) as catalyst and molecular oxygen as oxidant, was studied. In the oxidation reaction, cyclohexene was oxidized to 7-oxabicyclo[4,1,0]heptane, 2-cyclohexene-1-ol, 2-cyclohexene-1-one and 2-cyclohexene-1-hydroperoxide. It was found that the conversion of cyclohexene decreases in the order of PS-DD-Cu> PS-DD-Mn>PS-DD-Co>PS-DD-Ni, but the turnover number decreases with PS-DD-Ni>PS-DD-Mn>PS-DD-Co>PS-DD-Cu. A maximum conversion of 43% was observed for PS-DD-Cu/O2 system after a reaction of 10 h at 343 K as catalyst: substrate = 2 mg: 2 mL.