Preparation of nano-TiO₂ microspheres with high efficiency in photocatalytic degradation of gaseous benzene

• Main Authors: DU Jing-jing, ZHAO Jun-wei, CHENG Xiao-min, SHI Fei
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2020-05-01
• Series: Journal of Materials Engineering
• Subjects: nano-tio₂ microsphere; specific surface area; photocatalysis; gaseous benzene
• Online Access: http://jme.biam.ac.cn/CN/Y2020/V48/I5/100
• ISSN: 1001-4381; 1001-4381

The nano-TiO₂ microspheres were prepared by a hydrothermal method with urea in ethanol/water solution in the presence of sodium sulfate. The prepared samples were characterized by X-ray diffraction, transmission electron microscopy, N₂ adsorption-desorption and UV-Vis diffuse reflectance spectroscopy, the effects of hydrothermal temperature on the nano-TiO₂microspheres morphology were investigated, and the photocatalytic activities toward gaseous benzene of the samples were studied. The results indicate that the microspheres are composed of tiny nanoparticles, the TiO₂ microspheres pose high specific surface areas and uniform porous nanostructures, the optical absorption edges of the samples have "blue shift". The photocatalytic results confirm the benzene-degrading effectiveness of the TiO₂ microspheres, especially, the results show that no benzene detected after 20 min reaction with TiO₂ microspheres prepared at 180℃, however, the produced CO₂ concentration continues to increase, it indicates that TiO₂ microspheres with very high adsorptive capacity can enhance the subsequent photocatalytic reaction, and the mineralization ratio of this TiO₂ microspheres can be as high as 5.5, which is double of P25 (2.7).