P hotocatalytic A ctivity of Modified TiO 2 for M ethyl O range R emoval

Abstract

In this study, the researcher review on the modified TiO2 preparation via wet impregnation method for dye removal application. The bare TiO2 and Ag-TiO2 that have been synthesized undergo characterizations using XRD, FESEM-EDX and UV-Vis spectroscopy. The XRD pattern showed that the synthesized TiO2 was of pure anatase phase. The crystal structure of anatase TiO2 was not disturbed upon doping with Ag. FESEM images revealed that the TiO2 constitutes of various sizes of spherical and square-like shapes. EDX mapping illustrates that dopant metals are dispersed in a uniformed manner onto the TiO2 support and appeared as metal oxide. The bare TiO2 that has been modified acts as a photocatalyst to remove MO through the batch method. The effects of initial dye concentrations (5-25 ppm), pH solutions (2–9), catalyst loadings (0.5–4) g/L,) and light sources (visible, solar, UV) were analyzed. It was discovered that photocatalytic experiment performed using Ag-TiO2 has greater efficiency of MO removal that ranges from 32% to 100% in contrast to bare TiO2 with MO removal of 12%-67% for comparable dosages of photocatalyst at initial MO concentration of 5 ppm in both alkaline and acidic conditions under UV irradiation. It was postulated that Ag-TiO2 photocatalyst is the better candidate for effective dye removal.