Figure 6.

Selected examples of adsorption-based filters. Most adsorption-based filters come in one of the three depicted forms: solid porous media,^70,71,161 filtration columns,^{69,72,74,75,79,162−164} and thin membranes.^{46,73,138,139,165,166} The schematics are artistic representations of the selected filters; they are not drawn to scale and should not be interpreted as an accurate depiction of the mentioned filters. Green circles represent viruses, and the red color represents the coating or nanoparticles that adsorb viruses.