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Yang X.,Soochow University of China | Li L.,Key Laboratory for Green Chemical Process
Synthetic Metals | Year: 2010

The synthesis of polypyrrole (PPy) nanofibers has been achieved via a simple reactive template approach. The reactive template of FeCl3 and methyl orange (MO) leads to the formation of uniform PPy nanofibers. Moreover, the fabrication of PPy nanofibers with high yield is realized, suggesting that this methodology is appropriate for the large-scale production of the corresponding nanomaterials. In contrast to the NH3 gas sensor based on bulk PPy, the gas sensor based on the as-prepared PPy nanofibers exhibits greatly improved performances. © 2010 Elsevier B.V. All rights reserved. Source


So M.-H.,University of Hong Kong | Ho C.-M.,University of Hong Kong | Chen R.,Key Laboratory for Green Chemical Process | Che C.-M.,University of Hong Kong
Chemistry - An Asian Journal | Year: 2010

Platinum-group-metal (Ru, Os, Rh, Ir, Pd and Pt) nanoparticles are synthesized in an aqueous buffer solution of 4-(2-hydroxyethyl)-1-piper- azineethanesulfonic acid (HEPES) (200 mM, pH 7.4) under hydrothermal conditions (180 °C). Monodispersed (monodispersity: 11-15%) metal nanoparticles were obtained with an average particle size of less than 5 nm (Ru: 1.8±0.2, Os: 1.6±0.2, Rh: 4.5 ±0.5, Ir: 2.0±0.3, Pd: 3.8±0.4, Pt: 1.9±0.2 nm). The size, monodispersity, and stability of the as-obtained metal nanoparticles were affected by the HEPES concentration, pH of the HEPES buffer solution, and reaction temperature. HEPES with two tertiary amines (pi- perazine groups) and terminal hydroxyl groups can act as a reductant and stabilizer. The HEPES molecules can bind to the surface of metal nanoparticles to prevent metal nanoparticles from aggregation. These platinum- group-metal nanoparticles could be deposited onto the surface of graphite, which catalyzed the aerobic oxidation of alcohols to aldehydes. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Yang X.,Soochow University of China | Li L.,Key Laboratory for Green Chemical Process | Yan F.,Soochow University of China
Chemistry Letters | Year: 2010

Nanostructured conducting polymer/metal composites have attracted much attention due to their unique properties. Polypyrrole (PPy) nanotubes were first synthesized via a self- degraded template and then used as supports for in situ reduction of Ag+ ions. Ag nanoparticles could be uniformly assembled onto the PPy nanotube surface to get PPy/Ag composite nanotubes. The formation mechanism, morphology and structure of the nanocomposites were studied by transmission electron microscopy, thermogravimetric analysis, and X-ray diffraction. The one-dimensional hollow nanocomposites showed improved properties. © 2010 The Chemical Society of Japan. Source


Li G.,Key Laboratory for Green Chemical Process | Qin F.,Key Laboratory for Green Chemical Process | Yang H.,Key Laboratory for Green Chemical Process | Lu Z.,Key Laboratory for Green Chemical Process | And 2 more authors.
European Journal of Inorganic Chemistry | Year: 2012

A facile and fast microwave irradiation method has been developed to synthesize uniform well-defined 3D flowerlike BiOBr nanostructures through a self-assembly process. Cetyltrimethylammonium bromide (CTAB), which acts as both the bromide source and soft template, plays a critical role in the formation of 3D flowerlike BiOBr nanostructures. Different flowerlike BiOBr nanostructures could be obtained by varying the CTAB concentration. A possible formation process is discussed. The as-prepared flowerlike BiOBr nanostructures possessed a large surface area and exhibited an excellent removal capacity and fast adsorption rate for Cr VI ions in a wide pH range. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Qin F.,Key Laboratory for Green Chemical Process | Li G.,Key Laboratory for Green Chemical Process | Wang R.,Key Laboratory for Green Chemical Process | Wu J.,Key Laboratory for Green Chemical Process | And 2 more authors.
Chemistry - A European Journal | Year: 2012

Uniform bismuth oxide (Bi2O3) and bismuth subcarbonate ((BiO)2CO3) nanotubes were successfully synthesized by a facile solvothermal method without the need for any surfactants or templates. The synergistic effect of ethylene glycol (EG) and urea played a critical role in the formation of the tubular nanostructures. These Bi 2O3 and (BiO)2CO3 nanotubes exhibited excellent CrVI-removal capacity. Bi2O 3 nanotubes, with a maximum CrVI-removal capacity of 79mg g-1, possessed high removal ability in a wide range of pH values (3-11). Moreover, Bi2O3 and (BiO)2CO 3 nanotubes also displayed highly efficient photocatalytic activity for the degradation of RhB under visible-light irradiation. This work not only demonstrates a new and facile route for the fabrication of Bi2O 3 and (BiO)2CO3 nanotubes, but also provides new promising adsorbents for the removal of heavy-metal ions and potential photocatalysts for environmental remediation. Uniform Bi2O 3 and (BiO)2CO3 nanotubes were synthesized by a solvothermal method without involving any surfactants or templates. The synergistic effect of ethylene glycol and urea played a critical role in the formation of the tubular structure. The Bi2O3 and (BiO)2CO3 nanostructures not only exhibited excellent CrVI-removal capacity, but also displayed high photocatalytic efficiency for the degradation of Rhodaine B under visible-light irradiation (see figure). © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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