Pore-structured solids have the ability to adsorb particles from air or solution. existence of O-, N- or F- containing functional groups can help their micro-particles to be attracted to solid surfaces.
Dear Beniah Obinna Isiuku, they may have at the same time. For example styrene/divinylbenzene resins are functional porous structure. Porosity is introduced during synthesis with help of a porogenic solvent, after that it is Functionalized with cascade steps of chemical reactions. Another example is polurethane foams. My Regards