Electrospun dendritic ZnO nanofibers and its photocatalysis application

Abstract

A simple and efficient procedure has been developed to fabricate ZnO nanofibers with dendritic structure via electrospinning and subsequent calcination. The spinning solution is prepared by mixing polyvinylpyrrolidone (PVP) and zinc acetate into methanol. From SEM images, it can be observed that the ZnO product has a tendency of dendritic structure. The diameter of the dendritic branch is $137 nm. The structure and physicochemical property of the prepared nanofibers are elucidated by TGA, SEM, XRD, FTIR, and PL, respectively. The photoluminescene measurement of the ZnO samples exhibit a broad visible emission band concentrate on around 430-580 nm. Meanwhile, the intensity is related to the content of surface oxygen vacancies, which probably influence photocatalytic activity of ZnO samples. Whereafter, the photocatalytical activity of the ZnO nanofibers is evaluated by quantifying the degradation of methyl blue. The result indicates that ZnO nanofibers annealed at 650 C show an excellent photocatalytic activity.

Synthesis of ZnO Nanoparticles by the Sol-Gel Protein Route: A Viable and Efficient Method for Photocatalytic Degradation of Methylene Blue and Ibuprofen

“…The literature [23][24][25][26][27] also support the theory that the material structure, synthesis and preparation temperature of these materials have a great influence on their catalytic capacity.…”

Testing and Analysis of Concrete-Filled Square Hollow Section Stub Columns with Perfobond Leister Rib

“…14. As the adhesion between the concrete core and steel tube is too small, it is assumed that interfacial tension in the normal direction to the interface leads to separation between steel and concrete, whereas under compression, a contact relationship is assumed in the normal direction. This was modeled using 'cohesive contact' in ABAQUS, where the steel tube was selected as the "master" surface and the concrete was selected as the 'slave' surface [18]. The constitutive of the interface is adopted in Liu [19,20] according to a large number of interface ejection tests and push-off tests.…”

“…Perfobond Leister (PBL) was invented and applied in bridge construction in German initially [5]. Recently, composite dowel consisting of PBL with clothoid strip and concrete has been preferred in both highway and railway composite bridge in German [6,7].…”

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