Preparation and characterisation of Ag modified rutile titanium dioxide and its photocatalytic activity under simulated solar light

Abstract

Generally, anatase titanium dioxide (TiO 2) exhibit better photocatalytic activity than rutile TiO 2. In the present work, Ag modified TiO 2 were prepared by a simple sol-gel method and the photocatalytic activity of pure TiO 2 was enhanced via adding Ag. Moreover, Ag modified rutile TiO 2 shows the best photocatalytic activity compared to Ag modified anatase TiO 2 and pure TiO 2 owing to the lowest recombination rate of photogenerated pairs and the most surface hydroxyl groups.

Enhanced photoelectrocatalysis in porous single crystalline rutile titanium dioxide electrodes

“…Doping metal or non-metal elements in the lattice producing local defect structures in the donor or acceptor states in the band gap can effectively extend the absorbing frequencies to the visible and infrared region. [10][11][12] Nevertheless, the rapid electron/hole recombination in the photoanode induces short charge carrier lifetimes, which are not sufficient to support surface photochemical reactions. For example, the photogenerated carrier lifetime of nano-TiO 2 crystal catalytic materials which are conventionally used in photoelectrocatalysis is as short as ∼1 ns.…”

Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light

“…Employing photocatalytic technology to degrade harmful substances is a feasible way to solve the problem of environmental pollution. Among the numerous photocatalysts, TiO 2 has attracted the most attention and has been widely studied [1][2][3][4][5]. The lack of visible light utilization and quantum efficiency of pure TiO 2 limit its photocatalytic activity [6,7].…”

“…Two characteristic peaks of Ti 2p located at 458.3 eV and 464.0 eV are attributed to Ti 2p 3/2 and Ti 2p 1/2 .The distance between the two peaks is 5.7 eV, implying that Ti element exists as Ti 4+[38,39]. The O 1s peak splits into two characteristic peaks at 529.6 eV and 531.0 eV, corresponding to lattice oxygen (O 2− ) and surface hydroxyl (OH − )[5,38]. The Sn 3d spectrum consists of two peaks at 486.1 eV and 494.6 eV, which are ascribed to Sn 3d 5/2 and Sn 3d 3/2 , indicating that Sn element exists as Sn 4+[35].…”