Fabrication of graphenea€“TiO$_2$ nanocomposite with improved photocatalytic degradation for acid orange 7 dye under solar light irradiation

摘要

In this study, photodegradation of the non-biodegradable azo dye acid orange 7 (AO7) was selected as modal target in aqueous solution using graphenea€“TiO$_2$ (GRa€“TiO$_2$) hybrid nanocomposite, was well investigatedand elucidated. The crystal phase, special surface area, microscopic analysis of the GRa€“TiO$_2$ and also, chemical state of the photocatalysts were studied by powdered X-ray diffraction (PXRD), Raman spectrum, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution scanning electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauere Emmette Teller (BET) method andphotoluminescence spectroscopy (PL). During photocatalysis, the GRa€“TiO$_2$ nanocomposite improved photocatalytic performance compared with that of pure TiO$_2$ towards AO7 organic azo-dye degradation. The reusability test ofphotocatalytic activity was also examined. A conceivable reaction mechanism was suggested and nattered on the basis of tentative effects. Therefore, the GRa€“TiO$_2$ nanomaterial can be widely used as a photocatalyst for treatingthe organic dye contaminant in the field of environmental protection.