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Stuy of TiO2 Powder and Films Prepared by Sol-Gel Method

Author: ZhangRui
Tutor: TianYanWen；ZhuangYanZuo
School: Northeastern University
Course: Chemical processes
Keywords: sol-gel titanium dioxide powder films
CLC: TB383.3
Type: Master's thesis
Year: 2011
Downloads: 247
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Abstract


The nano-TiO2 catalyst is used widely, it has become one of the most developed environmental-friendly catalyst because of its low-cost, non-toxic, good stability in aqueous solution, good corrosion resistance, strong anti-UV ability and good transparency so on. The nano-TiO2 thin films not only solve the problem of catalyst separation and recovery, but can also overcome the disadvantages of its low stability in suspended phase and poisoning. The study of TiO2 is the important in theoretical development and practical application.In this paper, the TiO2 powder and films were prepared using sol-gel method, where the tetrabutyl titanate, ethanol, acetic acid and high pure water were used as the raw materials. The process parameters in preparing TiO2 powders and films were carefully explored. The effect of the processing parameters on the properties of sol-gel, TiO2 powders and films the properties of the powder and films was investigated using X-ray diffraction(XRD), differential scanning calorimetry(DSC), scanning electron microscopy(SEM) and optical microscope so on. The main conclusions are as follows:(1) The influence of ratio of raw materials and reaction temperatures on gelation time has been studied. It has been found that the increasing of water content enhance the formation of gelation time, i.e. shorten the gelation time. The addition of more ethanol existing in the solution caused the longer gelation time. When the other parameters are same, the gelation time increased with increasing addition of the acetic acid, then reached a maximum value followed by a decrease. Finally, the higher reaction temperature is benefit to the formation of gel.(2) The suitable parameters of prepared TiO2 powder was obtained, that is the mass ratio of tetrabutyl titanate, water, ethanol and acetic acid is 1:4:25:1, and the reaction is 25℃..(3) The phase transformation of amorphous-TiO2 to anntase-TiO2 is a kinetic process depending on the heating rate. The phase transformation activation energy increased with increasing volume fraction of the TiO2, (4) The roasting temperature and time are the main factors to influence the transformation of TiO2 crystal structure. With the increase of roasting temperature, the TiO2 is gradually transferred from amorphous to anatase, followed by the coexisting of rutile-TiO2 and anntase-TiO2, and finally the rutile-TiO2.(5) The heating rate, ratio of raw materials, and high magnetic field have no obvious influence on the phase transformation. The influence only on the content ratio of anatase and rutile type in TiO2 powder.(6) The roasting temperature has certain effect on the particle size of the TiO2 powder. As the roasted temperature raised, TiO2 powder have larger size; But TiO2 powder have narrow particle size distribution;(7) The heating rate has certain effect on the particle size of the TiO2 powder. When the highest roasted temperature is the same. the TiO2 powder has smaller particle size with faster heating rate.(8) The ratio of raw materials has certain effect on the particle size of the TiO2 powder. When the situations of roasting are the same, raw materials with larger amount of water have smaller size of powder.(5) The optimized process parameters of prepared TiO2 films were obtained. Tetrabutyl titanate, water, ethanol, and acetic acid is 1:3:25:1, the reaction temperature is 25℃and the number of spin is two times.

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