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Study on the Effect of Er3+: Y3Al5O12 and Er3+: YAlO3 on Photocatalytic Activity of TiO2 and ZnO

Author: XieYingPeng
Tutor: WangJun
School: Liaoning University
Course: Inorganic Chemistry
Keywords: Er3: Y3Al5O12 Er3: YAlO3 Titanium dioxide Zinc oxide Photocatalytic Activity
CLC: O643.3
Type: Master's thesis
Year: 2009
Downloads: 100
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Abstract


More recently, the use of certain catalysts photocatalytic process to become a hot research degradation of organic matter in the wastewater. TiO 2 and ZnO, as a photocatalyst, chemically stable, cheap, non-toxic, high catalytic efficiency advantages, they have been widely used to handle a variety of wastewater. The light-catalyzed process is because the semiconductor are excited to generate an electron and a hole, which can oxidize the organic substances adsorbed on the catalyst surface. However, since the TiO 2 and the wide band gap of ZnO, the use of the excitation light is limited to ultraviolet light (λ lt; 387 nm), containing only about 3-5% of the ultraviolet sunlight light. Thus use of solar energy in the degradation process, there is still a big challenge. For a long time, a lot of research has focused on expanding the TiO 2 and ZnO catalyst absorption wavelength, that is to say, let TiO 2 and ZnO photocatalyst able to maximize the absorption sunlight. In early studies, some scholars try to change the nature of the TiO 2 and ZnO ion doped with transition metal ions to reduce light generated electron - hole pair recombination rate and improve the interfacial charge metastasis purposes. Subsequently, an inorganic non-metallic dopant closer to the valence band of the catalyst is due to its ionic state and other researchers used to enhance the photocatalytic activity of the catalyst in the visible range. All of these methods are in the expansion TiO 2 and the light absorption range of the ZnO catalyst, but the light absorption spectra of these compounds is still very narrow, and these complexes, there is a thermal instability, electron - hole recombination centers, increasing the electron - hole recombination rate, expensive ion doping equipment requirements and complex process defects. In this paper, the use of visible light Er 3 : the the Y 3 Al 5 O 12 / TiO 2 complexes, Er 3 : the YAlO 3 / TiO 2 complexes, Er 3 : YAlO 3 / TiO 2 coverings, Er 3 : a YAlO 3 / ZnO complexes, Er < sup> 3 : of a YAlO 3 / ZnO coverings and Er 3 : a YAlO 3 / ZnO / TiO complexes were prepared. Subsequently, these complexes or covering is characterized by XRD, SEM or TEM. Azo dyes is one of the applications in the printing and dyeing industry, most synthetic organic dyes, and therefore is also a common industrial pollutants. Them during the manufacturing process a large number of applications and entering the environment. In this paper, Acid Red B is selected as analog pollutants to detect Er 3 : the Y- 3 Al 5 O 12 / TiO 2 complexes, Er 3 : a YAlO 3 / TiO 2 complexes , Er 3 : YAlO 3 / TiO 2 coverings, Er 3 : a YAlO 3 < / sub> / ZnO composite Er 3 : the YAlO 3 / the the the ZnO coverings and of Er of 3 : YAlO / ZnO / TiO 2 complexes photocatalytic activity under sunlight or visible light irradiation. In addition, of Er , 3 : Y 3 Al 5 of O 12 of Er 3 : YAlO 3 concentration, processing temperature and processing time of these complexes or covering photocatalytic activity through the degradation of Acid Red B experiments detailed investigation. Also, some of the experimental parameters, such as: the initial concentration of the dye solution was added in an amount of a photocatalyst, the acidity of the solution and the illumination time is also being studied. The mechanism of improving the photocatalytic activity of the photocatalyst prepared also been proposed. Compared with the traditional method, this new class of composite photocatalyst can provide sufficient UV light to a genuine need TiO 2 and ZnO particles. In addition, raw materials easily available and the complexes readily prepared. Therefore, it makes this new method in the sunlight utilization TiO 2 and ZnO, and reduce the cost of wastewater treatment has become a possibility.

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