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Preparation and Characterization of Nano Ce-TiO2 Films on Different Supporters

Author: XiJinTao
Tutor: XuZuoJing
School: Shandong University of Technology
Course: Materials Science
Keywords: porous haydite magnesite ball Nano-TiO2 Rare-earth element doping Photocatalytic activity
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 1
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Abstract


Extensive application of TiO2 in water treatment has been expected since the discovering of its photocatalytic character, due to its nonselective degradation ability of organic pollutants. However, TiO2 can exhibit its photo-catalytic properties only when it absorbs UV region, which is only a small fraction of solar energy. Therefore, how to improve the photocatalytic activity of TiO2 and the using efficiency of solar energy for the application in water treatment has become one research hotspot of all countries.The current problems of TiOb catalysts application in water treatment are summarized, such as improvement of the visible light catalytic activity and choice appropriate carrier. The methods which can improve the photocatalytic activity are reviewed and the preparation methods of immobilized TiO2 catalysts are analyzed. Preparation technics of TiO2 films loaded porous haydites with high porosity are studied. The TiO2 catalysts can float on the water and efficiently degrade methyl orange and.The application in water treatment are expected.The porous haydites used for water treatment were prepared with fly ash as main material, kaolin, quicklime and glass powder as auxiliary materials. The effects of low-temperature rice-husk ashes and the complex water-resistance agent on the cement tile of magnesite materials were mainly studied. The experiments show that the particles size of nano rice-husk ashes prepared by self-propagating low-temperature synthesis is about 50nm, the specific area is 196m2/g, and the SiO2 content is 92.30%; addition of right amount of nano rice-husk ashes markedly increases the water-resistance without reducing the bending strength of magnesite materials for water treatment.TiO2 films are synthesized by hydrothermal-templating method. The catalysts are characterized by UV-Vis, XRD and SEM. The results show that the particle of TiO2 films are small and steady grain size, large specific surface area and high degradation rate. The sol is added tri-block copolymer P123 (EO20PO70EO20) as template to increase the surface area. The results show that the P123 can dramatically influence the specific surface area of TiO2 films. The specific surface area of TiO2 with 2.5a.t%P123 is 226m2/g.Effect of Cerium(Ce) dopants in TiO2 photocatalyst is mainly studied,. The results show that the photocatalytic activity of TiO2, which co-doped by1.5a.t% Ce is optimal. The catalyst before-mentioned can degrade 98% of methyl orange in 2h.

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