Preparation of Photoactive Tungsten-doped Anatase Nanotubes Using Hydrothermal Technique

Abstract

TITANIA (TiO2) and tungsten doped titania (W-TiO2) nanoshpheres were prepared by sol-gel method, while tungsten doped titania nanotubes was formed by hydrothermal process. The structure and the morphology of the prepared photocatalysts have been characterized using X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) techniques, respectively. XRD results of the W-TiO2 powder, prepared by the sol - gel method and hydrothermal method showed that anatase structure was formed. HRTEM images illustrate that the average diameter of the as-synthesized W-TiO2 nanosphers was about 70 nm and the nanotubes have an outer diameter ranging from 8 to 10 nm and inner diameter of 2 to 3 nm and a length of few hundreds of nanometers. The photocatalytic performance of the prepared photocatalysts was studied through the degradation of acid orange dye (AO7). Higher efficiency for degradation of AO7 was obtained using W-TiO2 NT compared with TiO2 and W-TiO2 nano-powders. The results show that the dye removal was 99.88, 95.00 and 81.00 %within 60 minutes in the case of using W-TiO2 NT, W-TiO2 nanospheres and TiO2 nanospheres, respectively and the absorption edge shifts toward visible light region for both- TiO2 nano-powders and NT.

Keywords


Volume 59, Issue 6 - Serial Number 6
December 2016
Pages 955-966
  • Receive Date: 31 October 2016
  • Revise Date: 24 December 2016
  • Accept Date: 25 December 2016
  • First Publish Date: 31 December 2016