Nanomaterials have also been studied [8,9] for their ability to remove metal contaminants from air. Silicatitania nanocomposites can be used for elemental mercury removal from vapors such as those coming from combustion sources, with silica serving to enhance adsorption and Titania to photocatalytically oxidize elemental mercury to the less volatile mercuric oxide [7]. Other authors have demonstrated nanostructured silica can adsorb other metals generated in combustion environments, such as lead and cadmium [8,9]. Certain nanostructured sorbent processes can be used to prevent emission of nanoparticles and create byproducts that are useful nanomaterials.