Photoreduction of Dye with Noble Metal Gold Permeated with Metal Oxide Titania

Photoactive degradation of textile malachite green (MG), methylene blue (MB) dyes has been permeated on metal oxide TiO(2) nanoparticles under sunlight. Semiconductor photocatalysis is a promising method for removal of toxic chemicals from wastewater produced by industry. Due to tunable bandgap, TiO(2) among various semiconductor studied mostly. Large band gap (UV active) and recombination of exciton in TiO(2) less active in photo degradation. Noble metals such as gold nanoparticles deposited on TiO(2) surface increased the optical activity and to shift optical response to visible region. Degradation detail has been carried out by characterisation such as XRD, UV-Vis, PL, TEM, and SEM for MG and MB textile dyes under sunlight irradiation. UV-visible absorption spectra and PL spectra shows that photo-response of as prepared sample is extended from UV to visible region. PL intensity decreases with increases in concentration of Au nanoparticles, decreases in intensity in optical spectra of Au-TiO(2) composites shows that charge transfer process dominates. Au-TiO(2) plays an essential role in enhancing photocatalytical activity. Decolorization optimization depends on catalyst concentration, Dye concentration, light intensity and, irradiation time.