Green synthesized Ag-TiO 2 for degradation of organic dye through visible light driven photo-reactor and its kinetics

This study reports a green approach for the modification of titanium dioxide (TiO 2 ) nanoparticles with immobilization of silver nanoparticles. One of the natural sources i.e., Mangifera indica leaf extract was utilized as reducing and capping agent for the fabrication of Ag-TiO 2 nanocatalyst. Further, the surface morphology and band-gap energy of prepared Ag-TiO 2 were analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and UV–Vis spectroscopy. Also, it was characterized by X-ray Powder Diffraction (XRD) which provides the information regarding the crystallinity of the Ag-TiO 2 . Subsequently, photo activity of Ag-TiO 2 was investigated for the degradation of methylene blue (MB) dye wastewater through visible light driven photoreactor. The Ag-TiO 2 provided highest (68%) of photo-degradation efficiency within 110 min for 7.81 × 10 −5 mol/L initial MB concentration at pH 8 by using 0.19 g/L photocatalyst. Further, addition of 10 mM H 2 O 2 boost up the MB photodegradation to 74%. The kinetic study confirmed the MB degradation followed first order rate of reaction.