Synthesis of TiO۲-x nanoparticles via Ascorbic acid for degradation of organic dyes

This study aims to enhance the photocatalytic performance of titanium dioxide (TiO۲) by addressing its limitations, including its wide band gap and high electron-hole recombination rate. Initially, TiO۲ nanoparticles were synthesized via the sol-gel method, and their anatase structure was confirmed by X-ray diffraction (XRD) patterns. To improve visible light absorption, TiO۲ was reduced using ascorbic acid. However, the statement regarding the band gap reduction seems inconsistent; typically, the reduced sample should have a lower band gap (۲.۶ ev) than TiO۲ (۳.۲ ev). The photocatalytic activity was evaluated through methylene blue degradation, with the reduced sample achieving a ۴۵% degradation efficiency. These findings suggest that modifying the structural and chemical properties of TiO۲-x such as increasing oxygen vacancies and introducing Ti³+ ions extends its absorption spectrum into the visible region and enhances its photocatalytic performance.

کلیدواژه ها:

TiO۲-x nanoparticles ، photocatalytic performance ، organic dyes ، sol-gel method ، ascorbic acid ، band gap reduction ، X-ray diffraction ، methylene blue degradation ، oxygen vacancies ، Ti³+ ions