Photocatalytic performance of Sn-doped TiO_2 nanostructured mono and double layer thin films for Malachite Green dye degradation under UV and vis-lights

摘要

Nanostructure Sn~(4+)-doped TiO_2 based mono and double layer thin films, contain 50% solid ratio of TiO_2 in coating have been prepared on glass surfaces by spin-coating technique. Their photocatalytic performances were tested for degradation of Malachite Green dye in solution under UV and vis irradiation. Sn~(4+)-doped nano-TiO_2 particle a doping ratio of about 5[Sn~(4+)/Ti(OBu~n)_4; mol/mol%] has been synthesized by hydrotermal process at 225℃. The structure, surface and optical properties of the thin films and/or the particles have been investigated by XRD, BET and UV/vis/NIR techniques. The results showed that the double layer coated glass surfaces have a very high photocatalytic performance than the other one under UV and vis lights. The results also proved that the hydrothermally synthesized nano-TiO_2 particles are fully anatase crystalline form and are easily dispersed in water. The results also reveal that the coated surfaces have hydrophilic property.