Researchers have developed a new way to synthesize spherical nanosilica materials from agricultural wastes such as bagasse and rice husk ashes. This nanosilica material is highly effective at removing methylene blue, a toxic dye, from water. The new method is much simpler and more cost effective than traditional methods for synthesizing nanosilica. It also uses agricultural waste materials that would otherwise be discarded. The researchers believe that their new method could be used to produce large quantities of nanosilica based water filters at a low cost. This could help to improve access to clean water for people in developing countries.