TiO2 nanotube arrays with visible light catalytic

The TiO2 nanotube arrays were prepared by anodization, and the crystal structure was changed by calcination at different temperatures. The photocatalytic performance of the samples was measured by the degradation of rhodamine B under visible light. The TiO2 nanotubes calcined at 600 & DEG;C showed higher photocatalytic activity than other samples. The prepared catalyst is characterized by a variety of techniques, including X-ray diffraction, scanning electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, Raman, photoluminescence spectroscopy and electrochemical testing. The reasons for improving the catalytic activity were studied from the aspects of crystal structure, surface morphology, and photoelectric properties, and the catalytic mechanism was studied. The results show that the TiO2 nanotubes calcined at 600 & DEG;C contain two phases of anatase and rutile. Compared with pure phase TiO2, the charge transfer resistance is reduced and the electron-hole reorganization is well suppressed. In addition, it affects the band structure and improves the absorption of visible light. At the same time, studies have found that the main active substances in the catalytic process are h+ and & BULL;OH.

Automated summary

TiO2 nanotube arrays were prepared by anodization and their crystal structure was modified through calcination at different temperatures. The photocatalytic activity of the samples was evaluated by the degradation of rhodamine B under visible light. TiO2 nanotubes calcined at 600°C exhibited superior photocatalytic performance compared to other samples. Various characterization techniques were employed to study the catalyst, including X-ray diffraction, scanning electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, Raman spectroscopy, photoluminescence spectroscopy, and electrochemical testing. The improvement in catalytic activity was attributed to changes in crystal structure, surface morphology, and photoelectric properties, with the presence of anatase and rutile phases at 600°C calcination. The enhanced absorption of visible light, reduced charge transfer resistance, and suppressed electron-hole recombination were identified as contributing factors. It was also determined that h+ and •OH played key roles in the catalytic process.