Abstract
As a photocatalyst, TiO2 nanotubes can effectively degrade dyes; thus, they exhibit a considerable potential to mitigate the problem of river pollution by dye waste originating from the textile industry. However, with a band gap of 3.2 eV (UV light energy range), such nanotubes cannot be completely utilizing under visible light from the sun. Therefore, in this study, the TiO2 nanotubes are modified using bismuth to obtain bismuth-doped TiO2-NT (Bi–TiO2–NT), which exhibits an activity under visible light. Bi-TiO2-NT was successfully synthesized by one-step anodization with Bi(NO3)3 as the dopant source. The optimum synthesis conditions obtained were as follows: 1.0 M Bi(NO3)3 in an ethylene glycol electrolyte with anodization at 40 V for 1 h. In this study, the synthesized photocatalyst was characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), UV-Vis Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscopy–Energy Dispersive X-Ray Spectroscopy (SEM-EDS), and Linear Sweep Voltametry (LSV). The results of the photocatalytic activity tests indicated that under visible light illumination the prepared Bi–TiO2–NT was able to eliminate rhodamine B from the tested water, better then bare TiO2.
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