Degradation of Acid Yellow 36 Azo Dye From Textile Wastewater using Vanadium-doped TiO2 Photonanocatalyst
Wanhe Yao, Chao Luo, J. F. Wu, Gongjingyi Hou
Abstract
The current research is focused on the manufacture of TiO 2 and V-doped TiO 2 nanocatalysts by sol-gel and the evaluation of photodegradation performance in the treatment of Acid Yellow 36 (AY36) dye from textile wastewater under visible light irradiation. SEM and XRD investigations revealed that TiO 2 and V-doped TiO2 nanoparticles were produced in a spherical form, with well-crystallized α-V 2 O 5 nanostructures inserted in an anatase TiO 2 structure for V-doped TiO 2 nanoparticles. The optical band gap energies of TiO 2 and V-doped TiO 2 nanoparticles were found to be 3.08 and 2.22 eV, respectively, in the study optical absorption spectra. Doping V into the TiO 2 structure reduced the optical band gap energy, meaning that V-doped TiO 2 could be used under visible illumination. Electrochemical investigations revealed that the V-doped TiO 2 nanocatalyst had a decreased charge resistance and recombination rate. The photodegradation activity for treatment of 150 ml of 5 mg/l AY36 solution revealed that remarkable photodegradation was observed under the first 10 minutes of visible light irradiation for TiO 2 (20%) and V-doped TiO 2 (40%) in the presence of TiO2 and V-doped TiO 2 nanocatalysts, respectively, and total photodegradation was obtained after 75 and 60 minutes of visible light irradiation in the presence of TiO2 and The V-doped TiO 2 was found to be effective in removing AY36 from textile wastewater sources.