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Experimental Study on Fixed TiO2 Preparation & Application in Degradation of H2S in Low Concentration

Author: LiDong
Tutor: ZhangChengZhong
School: Xi'an University of Architecture and Technology
Course: Environmental Science
Keywords: Supported Catalysts Photocatalytic Oxidation H2S
CLC: X512
Type: Master's thesis
Year: 2007
Downloads: 152
Quote: 3
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Abstract


In this paper, the sol - gel prepared by the titanium sol, the use of dip - method to load on the glass fiber cloth and calcined TiO , 2 photocatalyst, homemade gas - solid light H 2 S inorganic malodorous gases on the degradation performance of the catalytic reaction device. The supported photocatalyst obtained in the present under the process conditions, detected by XRD, the average particle size is less than 10nm, the main polymorph of anatase phase and the rutile mixed-phase crystal type. This is the first of the load on the glass fiber cloth TiO 2 photocatalyst used in H 2 S degradation of malodorous gases, and achieved good results. The purpose of this study is to broaden the photocatalyst TiO 2 the range of applications, looking for an economical, efficient inorganic degradation of malodorous gases method. Study found that the impact on photocatalytic degradation and low concentrations of H 2 S gas efficiency factors can be divided into two categories: First, the catalyst preparation process, such as calcination temperature, load the number of layers and the catalyst modified ; gas environmental impact, such as relative humidity, oxygen content, and the initial concentration of H 2 S. Calcination temperature changes affect the the TiO 2 light catalyst average particle size, polymorph component constituting the photocatalyst is not too large, the photocatalyst obtained in different calcination temperature polymorphs are anatase phase and rutile phase mixed polymorphs. 500 ° C calcined supported photocatalyst particles obtained by the average size of smaller 6.7nm, and the anatase phase content of the catalyst obtained as compared with other calcining temperature is high, in the present experimental conditions, this process has been photocatalyst H highest 2 S degradation efficiency; load layers is not better, but there is a reasonable value, when the load stratum level of 3 layers, the experiment was better, also economic. The modified photocatalyst work, prepared by a silver nitrate was added during the preparation method of silver deposition supported TiO of 2 photocatalyst. The XRD results show that the silver deposition does not significantly change the crystal form and an average particle size of the photocatalyst, the results also show that a small amount of silver doped photocatalyst is no significant increase in the degradation efficiency of the the H 2 S, increase the doping amount such that the degradation efficiency. H 2 O molecules and nano-TiO 2 photocatalyst particles role in making the relative humidity on the catalyst degradation H 2 S have a greater impact when relative humidity 60% ~ 80%, preferably up to 97% degradation efficiency; degradation effect of the change of the oxygen content of the photocatalyst H 2 S, experiments show that when the oxygen content photocatalyst active site occupied 21% normal atmospheric level, the better, increase the oxygen content may cause makes the H 2 S degradation efficiency, so no additional oxygen The content can be made higher degradation efficiency, showing a good economy. In addition, under the conditions of this experimental study the TiO 2 Photocatalytic Degradation load, considered when H 2 S initial concentration to 300 mg / m 3 about the pollution load 34mgH 2 S / MgTiO of 2 around, with high degradation efficiency.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Malodorous substances
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