Photocatalytic activity study of TiO2 films grown on different substrates

• Main Authors: Ying-Jiun Chen, 陳盈均
• Other Authors: Shu-Mei Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/k77xc7

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 102 === Titanium dioxide is a semiconductor which exhibits catalytic properties. The photo-catalytic process over a semiconductor involves the absorption, band gap excitation, separation of the photo-excited electron/hole pairs, and redox reactions on the semiconductor surface. Since titanium dioxide shows relatively high reactivity and chemical stability, it has been widely studied in environmental application as for organic vapour degradation, hydrogen production from water, deodorization and antibacterial. The commercial available photocatalyst TiO2 is the form of nano-powder which would cause inhalation and lung damage during exposure. Moreover, it also causes several post-degradation treatment problems in application, such as filtration, precipitation, etc. Therefore, it is important to develope the technique of TiO2 immobilization. In this dissertation, two non-planar substrates, glass beads and stainless steel mesh, were studied. The titanium dioxide films were coated by dip coating via nano TiO2 aqueous solution. Coating films were characterized by SEM, EDX, and XRD. The photo-catalytic efficiency of films were investigated via methylene blue aqueous solution under UV light (395nm).