Effect of hydrothermal reaction time on morphology and photocatalytic activity of H2Ti3O7 nanotubes obtained via a rapid synthesis route

► The conventional method for preparing H2Ti3O7 nanotubes was modified. ► The time of forming a matured network of H2Ti3O7 nanotubes was decreased by 50%. ► The obtained multi-walled nanotubes showed large BET surface area. ► Methyl orange can be degraded effectively in the presence of H2Ti3O7 nanotubes.