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Feng J.-J.,Key Laboratory of Green Chemical Media and Reactions | Li Z.-H.,Key Laboratory of Green Chemical Media and Reactions | Li Y.-F.,Henan Institute of Science and Technology | Wang A.-J.,Key Laboratory of Green Chemical Media and Reactions | Zhang P.-P.,Key Laboratory of Green Chemical Media and Reactions
Microchimica Acta | Year: 2012

Iron oxide microparticles were coated with 3-aminopropyltriethoxysilane and then coated with hemin via an amidation reaction. The resulting composite particles were characterized by transmission electron microscopy. FTIR spectroscopy revealed two bands (at 1,701 and 1,634 cm -1), which were assigned to the carboxy group and the amide linkage, respectively, resulting from the linkage between hemin and the amino-modified Fe 3O 4 particles. In addition, strong Fe-O vibrations can be observed at 563 cm -1. An electrode was modified with these microparticles and then showed a well-defined redox behavior of the immobilized hemin, with a fast heterogeneous electron transfer process (14. 5 s -1). The electrode is capable of sensing both O 2 and H 2O 2 and displays a wide linear range, high sensitivity, and fast response. The composites reported here also may serve as a support for the immobilization of proteins, which paves the way to potential applications in novel biosensors and bioelectronic devices. © 2011 Springer-Verlag. Source


Wu C.,Key Laboratory of Green Chemical Media and Reactions | Wu C.,Xuchang University | Wang J.,Key Laboratory of Green Chemical Media and Reactions | Pei Y.,Key Laboratory of Green Chemical Media and Reactions | And 2 more authors.
Journal of Chemical and Engineering Data | Year: 2010

In the present work, aqueous poly(propylene glycol) (PPG) solution was separated into aqueous two-phase systems (ATPSs) in the presence of ionic liquid 1-allyl-3-methylimidazolium chloride ([Amim]Cl), 1-butyl-3-methylimidazolium acetate ([C4mim]Ac), or 1-butyl-3-methylimidazolium chloride ([C 4mim]Cl). The top phase was PPG-rich, whereas the bottom phase was ionic liquid (IL)-rich. Liquid-liquid equilibrium data for the ATPSs and the salting-out coefficients of the ILs have been determined at 298.15 K and atmospheric pressure. It was shown that the binodal curves and the tie-lines could be described by a three-parameter equation and the Othmer-Tobias and Bancroft equations, respectively. The salting-out ability of the ILs on PPG was found to follow the order: [Amim]Cl > [C4mim]Ac > [C 4mim]Cl > [C4mim][BF4]. Since PPG is a thermo-sensitive polymer and can be recovered simply by heating, these novel ATPSs are expected to have applications in the recycling and/or enrichment of hydrophilic ILs from aqueous solutions. © 2010 American Chemical Society. Source


Fan X.,Key Laboratory of Green Chemical Media and Reactions | He Y.,Key Laboratory of Green Chemical Media and Reactions | Guo S.,Key Laboratory of Green Chemical Media and Reactions | Zhang X.,Key Laboratory of Green Chemical Media and Reactions
Australian Journal of Chemistry | Year: 2011

RuCl33H2O catalyzed tandem reaction of alkynyl bromides with 2-aminothiophenols mediated by water is shown to represent a convenient synthesis of 2-benzoylbenzothiazoles. In addition, the Ru(iii) catalyst could be readily recovered and efficiently reused together with water up to three times. © CSIRO 2011. Source


Fan X.,Key Laboratory of Green Chemical Media and Reactions | He Y.,Key Laboratory of Green Chemical Media and Reactions | Zhang X.,Key Laboratory of Green Chemical Media and Reactions | Guo S.,Key Laboratory of Green Chemical Media and Reactions | Wang Y.,Key Laboratory of Green Chemical Media and Reactions
Tetrahedron | Year: 2011

A novel method for the synthesis of heteroaryl ketones through one-pot tandem reaction of 1,1-dibromoethenes with 2-amino(thio)phenols promoted by TBAF·3H2O and RuCl3(5%)/air was developed. This novel method includes several reactions in one-pot and utilizes economical yet efficient reagents to generate synthetically and biologically interesting heteroaryl ketones under mild conditions with good efficiency. © 2011 Elsevier Ltd. Source


Bai Z.,Henan Normal University | Bai Z.,Key Laboratory of Green Chemical Media and Reactions | Yan H.,Henan Normal University | Yan H.,Key Laboratory of Green Chemical Media and Reactions | And 6 more authors.
Ionics | Year: 2013

This paper repots a highly catalytic palladium nanoparticle catalyst dispersed on the purified multi-walled carbon nanotubes (P-MWCNTs) for the electrooxidation of formic acid, in which sodium oxalate is employed as both a dispersant and a coordination agent. The nanostructured catalysts have been characterized by X-ray diffraction technique and transmission electron microscopy. It is found that the as-prepared face-centered cubic crystal Pd nanoparticles are uniformly dispersed on the surface of MWCNTs with an average particle size of 5. 6 nm. Fourier transform infrared spectroscopy and thermogravimetric analysis revel that sodium oxalate is a tractable ligand with the aid of a suitable solution. Cyclic voltammetry and chronoamperometry tests demonstrate that the obtained Pd/P-MWCNT catalyst from typical experiment has better catalytic activity and stability for formic acid electrooxidation than acid-oxidation treatment MWCNT (AO-MWCNT)-supported Pd catalyst from the control experiment. Therefore, the as-prepared Pd/P-MWCNTs would be a potential candidate as an anode electrocatalyst in direct formic acid fuel cells. © 2012 Springer-Verlag. Source

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