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Synthesis and Study on the Photocatalytic Properties of Niobium Doped Mesoporous Titanium Deoxide

Author: YangWanXiu
Tutor: HeJie
School: Anhui University of Technology
Course: Applied Chemistry
Keywords: Mesoporous TiO2 Nb2O5-TiO2 Photocatalysis Phenol XRD
CLC: O643.3
Type: Master's thesis
Year: 2005
Downloads: 319
Quote: 4
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Abstract


In the past decade, mesoporous materials have been of great interest as catalysts because of their unique textural and structural characteristics. Mesoporous semiconductor oxides as potocatalysts to degrade organic substances have been a hotspot As the primary material of potocatalyst, titania （T1O2） has been considerably investigated and shown to be very effective for technological importance including environmental pollutant cleanup and photocatalysis applications for it’s chemical stability and close friend to environment. In recent years, It is one of major directions to modify TiO2 by mixing titania with other oxide semiconductor oxides.In this article, Mesoporous TiO2 was was synthesized via a combined sol-gel process with surfactant- assisted templating method, hexadecyltrimethylammonium bromide（CTAB） as template, Ti（OC4H9）4 as predecessor, triethanolamine as hydrolysis retarding agent and ethanol as solvent. Experiments decided on synthesis condition of Mesoporous TiO2 through investigating calcined temperature, amounts of surfactant, rate of heating, etc. Then, niobium was added the mesoporous system to synthesize mesoporous Nb2O5-TiO2, with niobium oxalate as predecessor.The resulting products were methodically characterized by TG-DTA, XRD, FT-IR,and diffuse reflectance UV-Vis spectra. The results showed that the mesoporous titania could be synthesized by calinced temperature at 400°C, and its mesoporous structure would be destroyed beyond 400°C. A suitable proportion between the surfactant and the predecessor will be essential. so did hydrolysis retarding agent and the predecessor. one of choice would be Ti/CTAB=3,TEA/Ti=3. The lattice parameter of TiO2 changed after niobium being added. At the same time, The distance between （101） crystal faces of the simples were increased and absorb edge was blue shift. With amounts of niobium increasing, the mesoporous structure stability of the composite oxides was declined.We evaluated photocatalytic activity of mesoporous TiO2 and Nb2O5-TiO2 composite oxides by using phenol as the objective degrading substance. The results showed that the initial concentration of the solution, contents of the catalyst and the process condition for mesoporous sieves’ synthesis affected the photocatalysis activity. The small amount adding of Nb2O5 hardly affected photocatalysis activity of TiO2.However, with amounts of Nb2O5 increasing, absorb edge of the simples was blue shift and ban band increased so that photocatalysis activity of the composite oxides was declined.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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