Key Laboratory for Green Chemical Process

Wuhan, China

Key Laboratory for Green Chemical Process

Wuhan, China
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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.


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.


Li S.,Key Laboratory for Green Chemical Process | Zhang W.,Key Laboratory for Green Chemical Process | So M.-H.,University of Hong Kong | Che C.-M.,University of Hong Kong | And 2 more authors.
Journal of Molecular Catalysis A: Chemical | Year: 2012

A facile solvothermal synthetic route has been successfully developed to fabricate Pd/Fe 3O 4 nanocomposite with the assistance of polyvinylpyrrolidone (PVP) in N,N-dimethylformamide (DMF) solution. The as-prepared Pd/Fe 3O 4 nanocomposite was composed of uniform 5 nm-sized Pd nanoparticles and Fe 3O 4 nanocrystals with dimension of 40 nm. In this fabrication, PVP played an important role as a capping agent. The as-prepared Pd/Fe 3O 4 nanocomposite exhibited superior catalytic performance and stability for various Suzuki coupling reactions, compared with single-component Pd nanoparticles under the same reaction conditions. More importantly, it displayed good magnetic property and could be easily separated from the reaction mixture by using a magnet and recycled for 10 times without losing its catalytic activity. © 2012 Elsevier B.V. All rights reserved.


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.


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.


Yang X.,Soochow University of China | Yang X.,Key Laboratory for Green Chemical Process | Tu Y.,Soochow University of China | Li L.,Hong Kong Polytechnic University | And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2010

Nanocomposites of chitosan and graphene oxide are prepared by simple self-assembly of both components in aqueous media. It is observed that graphene oxide is dispersed on a molecular scale in the chitosan matrix and some interactions occur between chitosan matrix and graphene oxide sheets. These are responsible for efficient load transfer between the nanofiller graphene and chitosan matrix. Compared with the pure chitosan, the tensile strength, and Young's modulus of the graphene-based materials are significantly improved by about 122 and 64%, respectively, with incorporation of 1 wt % graphene oxide. At the same time, the elongation at the break point increases remarkably. The experimental results indicate that graphene oxide sheets prefer to disperse well within the nanocomposites. © 2010 American Chemical Society.


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.


Cheng J.,Key Laboratory for Green Chemical Process | Ju X.-L.,Key Laboratory for Green Chemical Process
European Journal of Medicinal Chemistry | Year: 2010

A series of novel enaminone amides with improved side effect were synthesized by Hogenkamp et al. To explore the action mechanisms of enaminone amides, the homology model of rat α1β2γ2 GABAR was generated using the cryo-electron microscopy structure of the nAChR of Torpedo marmorata and the AChBP of Lymnaea stagnalis as the templates. Molecular docking and pharmacophore analyses allowed us to speculate the critical residues involving to the recognition of the ligands. The docking results indicated His128, Tyr186 and Tyr236 of α subunit were essential to form H-bond interactions contacts with the ligands. Specially, the N-substituents of enaminone amides as the sterically favored areas could form the important hydrophobic interactions with the residue Tyr186. The binding modes of novel enaminone amides with rat α1β2γ2 GABAR were studies by molecular docking and pharmacophore analyses. The results indicate His128, Tyr186 and Tyr236 of α subunit of GABAR are essential to form protein-ligand interactions. © 2010 Elsevier Masson SAS. All rights reserved.


Liu G.-Y.,Key Laboratory for Green Chemical Process | Ju X.-L.,Key Laboratory for Green Chemical Process | Cheng J.,Key Laboratory for Green Chemical Process | Liu Z.-Q.,Key Laboratory for Green Chemical Process
Chemosphere | Year: 2010

To explore the three-dimensional quantitative structure-activity relationships (3D-QSAR) and the pharmacophore model of a new class of potent activators of the anthranilic diamide ryanodine receptor (RyR), comparative molecular field analysis (CoMFA), comparative molecular similarity indices analysis (CoMSIA) and distance comparison technique (DISCOtech) were performed on 38 anthranilic diamides. Successful CoMFA and CoMSIA models yielded "leave-one-out" (LOO) cross-validated correlation coefficient (q2) values of 0.785 and 0.788 and non-cross-validated correlation coefficient (r2) values of 0.958 and 0.981, respectively. Results were graphically interpreted in terms of field contribution maps. A DISCOtech pharmacophore model containing an aromatic ring center, a hydrophobic ring center, a hydrogen bond-donor and a hydrogen bond-acceptor was constructed. This model indicated that hydrophobic interaction and hydrogen bonds have important roles in the interactions between activators and RyRs, which was consistent with CoMSIA results. The information obtained from CoMFA, CoMSIA and DISCOtech models enabled interpretation of the structure-activity relationships of anthranilic diamides. Based on the constructed models, some vital features for the interaction of anthranilic diamides with RyRs were identified, which may prove helpful in designing more potent RyR activators. © 2009 Elsevier Ltd. All rights reserved.


Chen F.,Key Laboratory for Green Chemical Process | Xie S.,Key Laboratory for Green Chemical Process | Zhang J.,Key Laboratory for Green Chemical Process | Liu R.,Key Laboratory for Green Chemical Process
Materials Letters | Year: 2013

Fe3O4 nanoparticles have been widely explored in magnetic separation, and are usually made in water or organic solvents. In this work, spherical Fe3O4-DES magnetic nanoparticles of ca. 10.5 nm were prepared by co-precipitating Fe3+ and Fe2+ ions in ionic solvent comprising choline chloride/urea deep eutectic mixture for the first time. Upon surface modification by ethylenediamine tetraacetate (EDTA), the Fe3O4-DES/EDTA magnetic nano-adsorbent has significantly improved Cu2+ adsorption capacity than Fe 3O4-DW/EDTA (28 vs. 21 mg/gFe3O4), where Fe3O4-DW is synthesized in water under otherwise identical conditions. © 2013 Elsevier B.V. All rights reserved.

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