Methods comprising mixing at least one nano-porous particle into a homogeneous solution of a polymer and a diluent at an elevated temperature to form a mixture; and cooling the mixture to solidify the polymer. Membranes comprising at least one nano-porous particle; and a polymer; wherein the at least one nano-porous particle comprises pores ranging from about 0.1 nanometers to about 10,000 nanometers in size.