Time filter

Source Type

Wang Q.,Northwest Normal University | Wang Q.,Key Laboratory of Eco Environment Related Polymer Materials | Hui J.,Northwest Normal University | Li J.,Northwest Normal University | And 4 more authors.
Applied Surface Science

Photocatalyst BiOCl modified by polyaniline (PANI/BiOCl) was synthesized via a facile chemisorptions method. X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectroscopy (DRS) were employed to study the phase structure, morphology and optical properties of the samples. The results showed that the PANI increased absorption intensity and absorption bands of the pure BiOCl. Photodegradation of methyl orange (MO) on the samples were investigated under visible light irradiation and 7 wt.% PANI/BiOCl composite showed the highest photocatalytic activity. The enhanced photocatalytic performance could be attributed to PANI/BiOCl composites and the synergistic effect between PANI and BiOCl. According to experimental results, the possible photocatalytic mechanism of the PANI/BiOCl photocatalysts was proposed. © 2013 Elsevier B.V. All rights reserved. Source

Huo C.,Key Laboratory of Eco Environment Related Polymer Materials | Huo C.,Northwest Normal University | Chan T.H.,Northwest Normal University | Chan T.H.,McGill University
Chemical Society Reviews

This critical review describes a new liquid-phase strategy for organic synthesis by using organic ions as soluble supports. Catalysts or reagents or substrates are immobilized onto organic ions. They are generally soluble in polar organic solvents (e.g. CH3CN) or ionic liquids but insoluble in non-polar solvents (e.g. ether or hexanes). Their reactions are carried out in homogeneous solution phase with a polar organic solvent or ionic liquid. After the reaction, the ion-supported species can be phase separated through precipitation from the polar organic solvent by the addition of a less polar organic solvent or extraction with organic solvents from ionic liquids. The ion-supported species can therefore be easily recovered and purified from the reaction mixture by simple washings with the less polar solvent. The ion-tagged species can function in the role of a catalyst, or as a reagent, or as the substrate in the synthesis of small molecules or bio-oligomers. Ion-supported catalysts and reagents can usually be recovered and reused with little diminution of activity. Important biooligomers such as peptides, oligosaccharides and oligonucleotides have been synthesized with this method (136 references). © 2010 The Royal Society of Chemistry. Source

Wang W.,Key Laboratory of Eco Environment Related Polymer Materials | Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Ji S.,University of the Western Cape | Feng H.,Northwest Normal University | And 2 more authors.
Journal of Power Sources

In this study, a novel core-shell structured Pd3Fe@Pt/C electrocatalyst, which is based on Pt deposited onto carbon supported Pd3Fe nanoparticles, is prepared for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The carbon supported Pd3Fe nanoparticles act as seeds to guide the growth of Pt. The formation of the core-shell structured Pd3Fe@Pt/C is confirmed by transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical characterization. The higher surface area of the synthesized catalyst suggests that the utilization of Pt in the Pd3Fe@Pt/C catalyst is higher than that in Pt/C. Furthermore, better electrocatalytic performance than that of Pt/C and Pd3Fe/C catalyst is observed in the ORR which follows a four-electron path. Consequently, the results indicate that the Pd3Fe@Pt/C catalyst could be used as a more economically viable alternative for the ORR of PEMFCs. © 2009 Elsevier B.V. All rights reserved. Source

Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Li H.,Huizhou University | Feng H.,Northwest Normal University | Wang H.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.,Key Laboratory of Eco Environment Related Polymer Materials
Journal of Power Sources

In this study, a low-cost and high performance catalyst with core-shell structure of PdCu@PtRu/C for methanol oxidation is prepared by a two-step replacement reaction. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) examinations show that the composite catalyst particles distribution is quite homogeneous and has a high surface area. The Pt mass activity of this catalyst is about 15 and 3.4 times as large as those of the Pt/C and PtRu/C catalysts, respectively. High electrocatalytic activities could be attributed to the synergistic effect between PtRu and PdCu. © 2009 Elsevier B.V. All rights reserved. Source

Li C.-L.,China Pharmaceutical University | Li C.-L.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.-Q.,Key Laboratory of Eco Environment Related Polymer Materials | Wang Q.-Z.,Key Laboratory of Eco Environment Related Polymer Materials | And 3 more authors.
Journal of Molecular Catalysis

TiO2(B) nanobelts had been synthesized in highly yield and middle conditions via a simple route including tetrabutyl titanate hydrolysis in an alkali solution → hydrothermal → proton-exchange → roasting. Morphological evolution and crystalline structure transmission were also achieved by just controlling the experiment parameters. HRTEM, FESEM, XRD, UV-vis, BET and photo-stimulated surface reaction technology were used to investigate the surface structure, photo absorption property and photocatalytic performance of TiO2(B). The photocatalytic properties for H2 production were systematically tested. The results were shown that the photocatalytic activity followed the sequence: NaxH2- xTi3O7·nH2 nanowires > TiO2(B) > TiO2(anatase) > Na2Ti6O13. The obtained Ti2O(B) displayed relative excellent photocatalytic properties for H2 production. It was revealed that the morphology and crystalline structure phase played important roles in the photocatalytic reaction. In addition, a possible growth mechanism of TiO2(B) involving Na2Ti3O7 → H2Ti3O7 → H2Ti6O13 → H2Ti12O25 → TiO2(B) was proposed based on the structure examination. ©, 2015, Science Press. All right reserved. Source

Discover hidden collaborations