Nanocomposites such as AgNPs -TiO2 and AgNPs -ZnO are used widely as these metal oxides enhances the photocatalytic activity of AgNPs . These nanocomposites can significantly degrade phenolic compound and can also be effective against Azo dyes which consist of organic compounds such as 4nitrophenol which not only has the odour problems but also reduces oxygen contents and blocks the sunlight from reaching the aquatic system . However, the AgNPs tends to leach from TiO2 and ZnO over time which may cause toxicity and reduce the photocatalytic efficiency. To prevent leaching of AgNPs from metal oxide, stabilizers like silica and carbon-based materials should be used . As the bandgap of ZnO and TiO2 for visible light adsorption via SPR is wide [104,105] metal oxide should be doped with transition metal such as Fe, Cu, Co to narrow the bandgap.