Effect of H2O2 on TiO2 nanotubes structure and photocatalyst properties for degradation of 2,4-dichlorophenol

In this study, highly ordered vertically aligned titanium dioxide nanotubes were fabricated for photocatalytic degradation of 2,4-dichlorophenol. For this purpose, the two-step anodization process of titanium sheet was performed in the ethylene glycol electrolyte containing ammonium fluoride and distillated water under a constant voltage of 40 V. In the photocatalytic degradation of 2,4-dichlorophenol, the presence and the absence of hydrogen peroxide (H2O2) in the pollutant solution were investigated. Effect of H2O2 on the TiO2 nanotubes structure and their photocatalytic properties were evaluated using field emission scanning electron microscope (FESEM) and uv-vis spectrophotometer. The results showed that the presence of H2O2in pollutant solution had a significant effect on the TiO2 nanotubes photocatalytic properties. H2O2presence in the pollutant solution led to the destruction of the tubular structure of TiO2 nanotubes and consequently decreased the photocatalytic performance of titanium dioxide nanotubes. Adding one ml of hydrogen peroxide to the pollutant solution caused degradation of pollutants from 50% (in the absence of H2O2) to 14%.

کلیدواژه ها:

TiO2 nanotubes ، Anodic oxidation ، Photocatalytic degradation ، Hydrogen peroxide