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Preparation, Characterization And Photoelectrocatalytic Performance Of TiO2-based Nanotube Arrays

Posted on:2014-05-14Degree:MasterType:Thesis
Country:ChinaCandidate:T ShiFull Text:PDF
GTID:2271330452470024Subject:Environmental Science
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In this work, TiO2nanotube arrays were prepared by two-step anodization. TheTiO2nanotube arrays were characterized via FE-SEM, FE-TEM, XRD, XPS andRaman spectroscopy. The TiO2nanotube arrays were in good structure. In addition,the anatase crystalline of TiO2had reached to perfect. As the anodic oxidation timevaried from1h to4h, the nanotube length grew from6.92μm to20.84μm.Followingly, the photoelectrocatalytic activity of the TiO2were investigated bymeasuring the degradation rate of methylblue(MB) under ultraviolet light. Theoptimal activity is the TiO2nanotubes anodized for2h (MB degradation efficiency for88.71%). Furthermore, the photoelectrocatalytic reaction corresponded to first-orderkinetics model and the maximal rate constant(k=0.024min-1) was corresponding to thephotoelectrocatalytic result.Subsequently,heterostructure TiO2/SrTiO3nanotube arrays were fabricated inSr(OH)2hydrothermal solution using TiO2nanotubes as both an initial reactant and a“structure-template” after calcination. The heterostructure TiO2/SrTiO3werecharacterized via FE-SEM, FE-TEM, XRD, XPS and Raman spectroscopy. Theresults show that some TiO2in situ converted into SrTiO3on the surface of the highlyordered nanotubes, promoting the growth of anatase TiO2(004) facets. As the anodicoxidation time varied from1h to4h, the tube length grew from7.19μm to20.78μm.The photoelectrocatalytic activity of the heterostructure TiO2/SrTiO3was investigatedby measuring the degradation rate of MB under ultraviolet light. Compared with thepure TiO2nanotubes, the heterostructure TiO2/SrTiO3exhibited excellentphotoelectrocatalytic activity. The optimal activity is the heterostructure TiO2/SrTiO3anodized for2h (MB degradation efficiency for99.66%).Moreover, thephotoelectrocatalytic reaction corresponded to first-order kinetics model and themaximal rate constant (k=0.396min-1) was corresponding to the heterostructurenanotubes with2h reaction.
Keywords/Search Tags:TiO2nanotube arrays, anodization, hydrothermal method, heterostructure TiO2/SrTiO3, photoelectrocatalysis
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