To be specific, the BET surface area and the total pore volume of mesoporous aluminosilicates have a linear relation with the D4 adsorption capacities, whereas the external surface area and the mesopore volumes are related to the D4 adsorption capacities in a parabolic way. In contrast, the micropore volume, micropore surface area, and averaged pore size (20 Å for all the materials) of mesoporous aluminosilicates are not closely related to the D4 adsorption capacities. The parabolic relationship means some textual properties, such as mesopore volumes and external surface areas, have more impact on the adsorption capacity than other properties, such as micropore volume. The larger pore size of the
adsorbents can provide larger possibility and wider pathways of adsorption (Scheme 1), especially when the pore sizes of adsorbents (20 Å) are close to the size of adsorbates (10 Å). The larger mesopore volume will allow more D4 to remain in the adsorbents.