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Xue J.,Nanjing Southeast University | Ma S.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | Zhang Z.,Nanjing Southeast University | Jiang P.,Xuchuan Chemical Suzhou Co.
RSC Advances | Year: 2015

A novel Ag/ZnO/C plasmonic photocatalyst was synthesized via a facile calcination and photodeposition route. Samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results indicated that Ag and ZnO nanoparticles sized 5-10 nm were uniformly dispersed on the surface of the carbonaceous layers in Ag/ZnO/C composites. The adsorption capacity and photocatalytic activity were investigated by adsorption and photocatalytic degradation of tetracycline hydrochloride (TC-HCl) in aqueous solution. The results showed that the obtained Ag/ZnO/C sample exhibited higher adsorption capacity and enhanced UV and visible light driven photocatalytic activity to TC-HCl compared to ZnO/C and pure ZnO. With the presence of Ag nanoparticles and carbonaceous layers incorporated in the structure, the Ag/ZnO/C composites can make use of not only the UV region of sunlight, but also the visible region and efficiently promote photogenerated electron separation and transportation as well as generating more active reaction sites, which synergistically facilitate the photocatalysis process. Our present work provides a simple and new pathway for the design of ZnO-based catalysts that respond to both UV and visible light and promotes their practical application in various environmental and energy issues driven by solar light. © The Royal Society of Chemistry 2015.

Wang H.,Nanjing Southeast University | Wang H.,Xuchuan Chemical Suzhou Co. | Zhou Y.,Nanjing Southeast University | He M.,Nanjing Southeast University | Dai Z.,Xuchuan Chemical Suzhou Co.
Colloid and Polymer Science | Year: 2015

To study the waterproof of coating materials, a series of waterborne polyurethanes were prepared with different kinds and molecular weight of polyols. IR spectroscopy was used to check the end of polymerization reaction and characterization of polymer. The study was carried out by increasing the waterproof of various coating agents through variations of soft segments. We introduced laser-scattering equipment, Brookfield digital viscometer, JC2000C instrument, scanning electron microscope (SEM), and atomic force microscope (AFM) to investigate the particle size, viscosity, contact angle, and morphology of the coated fabric. In short, results displayed waterproof as follows: 3146~8200 mm H2O (IPDI = 30 %) in various polyols and 5421~8748 mm H2O (R = 1.6) of different molecular weight of poly(butylene adipate) (PBA). The higher water resistance belonged to PTMG-WBPU and WBPU-1000, respectively. Experimental results indicated that water resistance may be controlled by not only the types of soft segments, but also the molecular weight. © 2014, Springer-Verlag Berlin Heidelberg.

Bu X.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | Zhang T.,Nanjing Southeast University | He M.,Nanjing Southeast University | And 3 more authors.
RSC Advances | Year: 2015

In this work, laterally-uniform Mn3O4 nanosheets with regular square-like shapes and tunable lateral dimensions are synthesized through an effective one-pot solvothermal chemical reaction. The formation pathway of the Mn3O4 nanosheets and sized-controlled methods are also investigated. © The Royal Society of Chemistry 2015.

Zhang Z.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | Zhang Y.,Nanjing Southeast University | Zhou S.,Nanjing Southeast University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2015

A facile method has been developed for the synthesis of highly active and well-defined AuPt nanoalloys supported on the surface of ellipsoidal Fe@SiO2 nanoparticles. This method involves the loading of Pt NPs on the Fe2O3@SiO2 nanocapsules via Sn2+ linkage and reduction, then in situ fabrication of Au nanoparticles by the galvanic replacement reaction between Au and Pt, and finally calcination and reduction to convert the nonmagnetic Fe2O3 to Fe core with high saturation magnetization. XRD and XPS analysis demonstrates the alloy structure of AuPt nanoparticles in the final samples. The obtained Fe@SiO2/AuPt samples exhibit a remarkably higher catalytic activity in comparison with the supported monometallic counterparts toward the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. The catalyst can be reused for several cycles with convenient magnetic separation. This journal is © The Royal Society of Chemistry 2015.

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