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Preparation of TiO2/Ti Composite and its Photocatalytic Activity

Author: WangZuo
Tutor: LiuHongFang
School: Huazhong University of Science and Technology
Course: Applied Chemistry
Keywords: TiO2nanotube anodic oxidation doping photoelectrocatalytic degradation
CLC: TQ134.11
Type: Master's thesis
Year: 2012
Downloads: 36
Quote: 0
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Abstract


As an important semiconducting material, Titania has been widely used in the field ofphotocatalytic degradation of organic contaminants. In this paper, TiO2nanotubes wereprepared by anodic oxidation method，and the influence of oxidation voltage, oxidationtime and the calcination temperature on the morphology of TiO2nanotubes were studied.Combining with FSEM, XRD testing methods, the structure and morphology of TiO2nanotubes were analyzed. In the electrolyte of0.5wt%HF, at oxidation voltage of25V,oxidation time at50min, calcination temperature of500℃， the morphology andphotocatalytic character of TiO2nanotubes were best. The TiO2nanotubes were restoredby the sol and the result of FSEM showed it’s a good way to make the nanotubes perfect.The catalytic activity of TiO2nanotubes for the degradation of methyl orange wasdiscussed under different experimental conditions, the experimental results indicated thatwhen initial concentration of methyl orange at5mg/L,the solution pH of1.0, the biaspotential of0.5V, the UV photoelectrocatalytic degradation rate reached91.2%after3hlater. The repeated experiment also showed that the TiO2nanotubes prepared had excellentphotocatalytic activity and useful life. The electrochemical impedance spectra was used toinvestigate the proccess of the degradation under the conditions of dark, UV light, UVlight with a bias potential. The results showed the system impedance was minimal and thephotocatalytic efficiency of TiO2nanotubes was very high in UV light and bias potentialcondition.The Ag-doped TiO2nanotubes were prepared by sol-gel-immersion process, and thesamples were studied by FSEM, XRD and UV-VIS. It was concluded that there was Agon the surface of TiO2nanotubes indeed, the absorption of Ag-doped TiO2in the UV lightdistrict was strengthened and the band edge moved to longer wavelength obviously.RuO2-doped TiO2nanotubes were prepared by the electro-deposition method, resultsof the test showed that the catalytic activity of RuO2-doped TiO2was strengthened in thevisible light comdition.

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CLC: > Industrial Technology > Chemical Industry > Inorganic compounds, the chemical industry of the metal elements > Section IV metals elements inorganic compounds > Inorganic compounds of the element titanium vice family ( IV B family) > Inorganic compounds of titanium
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