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Fabrication and Characterization of Electrospun Samarium-Doped Titanium Dioxide/Carbon Nanofiber Photocatalyst

Author: YuJiangWei
Tutor: YuYunHua
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Electrospinning Titanium dioxide Samarium ion doping Carbon nanofibers Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 153
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Abstract


Nano- titanium dioxide (TiO2) because of its large surface area, good stability , non- toxicity and high efficiency of photocatalytic organic pollutant treatment , a great deal of attention . However, the TiO2 photocatalytic applications , there are two problems : First, pure nano-TiO2 powder photocatalytic efficiency is limited ; nano-TiO2 powder easy solution reunion loss , difficult recovery . These two factors largely limit the the TiO2 photocatalyst industrial nano- TiO2 doping modification and load can effectively solve these two problems . Electrospinning method as a simple and efficient method for preparing organic / inorganic hybrid micro - nano- fiber and has been developing rapidly . In this thesis, using the sol - gel method and electrospinning wears combine prepared the samarium ion doped titania precursor / PAN nanofibers [ Sm - TiO (OAc ) 2/PAN ] , and by the subsequent drafting pre- oxidation, ammonia treatment and the high - temperature calcination process, samarium - doped titania / carbon nanofibers (Sm-TiO2/CNFs) photocatalyst . Prepared nano - fiber morphology , crystalline structure and chemical composition characterized by degradation of methyl orange solution was investigated using TEM, FESEM, XRD, FT-IR, EDX and XPS testing means the the Sm-TiO2/CNFs photocatalytic activity . The study results showed that , the electro-spinning Sm-TiO (OAc) 2/PAN nanofibers uneven surface, a diameter of about 700nm . After 250 ° C drawn pre-oxidation , the fiber orientation degree is increased, the surface becomes smooth and due to the physical and chemical shrinkage fiber diameter is reduced to 500- 600nm . After ammoniation treatment and 600 ° C calcination , the diameter of the pre - oxidized fibers are contracted further to 250- 350nm , and about 25 wt. % Of anatase type Sm-TiO2 nano-particles uniformly distributed in the the CNFs surface or internal , Sm -TiO2 and the average grain The grain size of about 10nm . Same UV irradiation , Sm-TiO2/CNFs than TiO2/CNFs photocatalytic activity higher Sm3 doped suppress recombination of electron - hole pairs to make Sm-TiO2/CNFs surface adsorbed oxygen increased strong oxidizing free radicals , thereby generating more methyl orange molecules decomposed .

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