Preparation of TiO2 by Sol-gel Method and Its Photocatalytic Properties
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摘要: 二氧化钛(TiO2)作为环境友好型催化剂,在光催化中发挥着很重要的作用,是一种重要的光催化材料。以钛酸丁酯(TBT)为钛源,采用溶胶凝胶法在非搅拌状态下制得二氧化钛粉体。通过X-射线衍射(XRD)、扫描电镜(SEM)、透射电子显微镜(TEM)以及紫外-可见(UV-Vis)光谱对样品的晶体结构、形貌以及吸光度进行分析测定。试验结果表明,随着煅烧温度的升高,样品由锐钛矿相变为金红石相,形貌也发生了变化;在400℃下煅烧后的样品呈类似花生的形貌,500℃出现了不规则的形状,600℃开始出现金红石相,700℃全部为金红石相和不规则的形貌;以甲基橙为模拟污水,考察样品紫外光照射下降解甲基橙的能力,其中400℃煅烧的样品在光照80 min后甲基橙的降解率达到了91%,光催化性能最好。Abstract: As an environment-friendly catalyst,titanium dioxide(TiO2) plays an important role in photocatalysis.In this paper,TiO2 powder was prepared by sol-gel method without stirring,using butyl titanate(TBT) as the titanium source.The crystal structure,morphology and absorbance of the samples were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and ultraviolet-visible spectroscopy(UV-Vis),respectively.The results show that the phase of the samples changes from anatase to rutile with increase in calcination temperature,combined with the morphology variation.The sample roasted at 400℃ shows peanut-like morphology,and the irregular shapes appear at 500℃.The rutile phase begins to appear at 600℃.At the calcination temperature of 700℃,all the phases transfer into rutile with irregular morphology.Using methyl orange as the simulated wastewater,the degradation ability of the samples was investigated under ultraviolet irradiation.The best photocatalytic property can be obtained with the sample calcinated at 400℃,leading to 91% of degradation rate for methyl orange at 80 min of illumination.
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Key words:
- titanium dioxide /
- photocatalytic properties /
- sol-gel method /
- methyl orange /
- degradation rate
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