Investigation of the Sn4+-distribution and photocatalytic performance of Sn4+/TiO2 hollow fiber nanomaterials

Abstract

In this work, under an optimal amount (0.03 mol%) of doped Sn⁴⁺ ions, a series of Sn⁴⁺/TiO₂ fiber nanomaterials with different distribution depths of Sn⁴⁺ ions were smartly prepared via a two-step cotton template-assisted strategy and evaluated as photocatalysts for the degradation of methyl blue. The results show that the distribution depth of Sn⁴⁺ ions in Sn⁴⁺/TiO₂ could be controllably tuned by adjusting the calcination time at 600 °C, and affects the photocatalytic activity of TiO₂ remarkably. Also, an appropriate distribution of Sn⁴⁺ ions is helpful for a high enhancement of the photocatalytic activity. The reason could be mainly ascribed to the surface/interface state and fast charge transfer and larger surface area of the photocatalyst.