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Preparation of Ion-doped Nanometer TiO2 Photocatalyst and It’s Application in Degradation of NO2～-

Author: ZhangChunMei
Tutor: QiuKeHui
School: Chengdu University of Technology
Course: Materials Science
Keywords: Sol - gel Doping modification UV absorption Photocatalytic Activity Degradation rate
CLC: TB383
Type: Master's thesis
Year: 2005
Downloads: 143
Quote: 1
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Abstract


Nano TiO 2 highly active , safe , non-toxic , chemically stable ( resistant to chemical and light corrosion ) , poorly soluble, low cost , excellent prospects for its application to become a focus for researchers . Currently, it is the use of nano TiO 2 photocatalytic degradation of organic pollutants has quite a few . Photocatalytic study of inorganic pollutants can not be ignored . NO 2 - ion is a greater harm environmental pollutants , mainly from nitrogen oxides in the air present in the air and water , can be carcinogenic . Therefore, this study of NO 2 < / sub > - < / sup> ion as target degradation products , the sol - gel prepared doped Fe of 3 Ce < sup > 3 , V 5 ion nano- TiO 2 for light ions NO 2 - the catalytic degradation as the main content of the research . By X-ray diffraction ( XRD ) , transmission electron microscopy ( TEM ) , scanning electron microscopy (SEM), UV - visible spectrophotometer (UV-Vis) test analysis and photocatalytic experiments to study the synthesis process photocatalyst doped component the amount of catalyst, initial concentration of nitrite and photocatalytic activity , the following understanding : ( 1) doping components on nano TiO 2 < / sub> crystal phase transition influential . In the same preparation under the process conditions , the amount of the doping component (Fe 3 , Ce 3 , V 5 ) , less than 5% when not conducive to the nano - TiO 2 crystal phase transformation from anatase to rutile phase . (2) prepared under the same preparation conditions and the conditions of the amount of the same doping of the light is in descending order of the catalyst on the degradation rate of nitrite : the doped iron TiO 2 GT ; cerium-doped TiO 2 gt; TiO 2 gt; the doped vanadium the TiO 2 < / sub > . ( 3 ) a certain percentage of the anatase and rutile nano TiO 2 < / sub> mixed crystal phase composition than pure anatase crystalline phase of the high efficiency of photocatalytic degradation ; smaller the grain size , photocatalytic the better. The catalyst concentration of 1g / L , the degradation better the higher degradation rate of the initial concentration of the nitrite solution is lower .

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