Adsorption Surface Area and Porosity

Abstract

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Microwave-Induced Degradation of Atrazine Sorbed in Mineral Micropores

“…Molecules occluded inside porous solids experience the interactions with all surrounding pore wall surfaces, and the dispersion force fields acted by various parts of the surface overlap each other when the pore dimension is small enough. 41,42 Appreciable enhancement of adsorption potentials can occur in micropores of six molecular diameters or even larger. 41,43 The enhancement of adsorption fields in the micropores of CBV-720, which can be accessed by atrazine molecules, partially explains its uniquely high atrazine sorption capacity compared to the other mineral sorbents.…”

“…41,42 Appreciable enhancement of adsorption potentials can occur in micropores of six molecular diameters or even larger. 41,43 The enhancement of adsorption fields in the micropores of CBV-720, which can be accessed by atrazine molecules, partially explains its uniquely high atrazine sorption capacity compared to the other mineral sorbents. MCM-41 is composed of amorphous silica wall but possesses a long-range ordered framework with uniform mesopores.…”

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

“…As sorbate molecules adsorbed in the pore interior interact with all the surrounding pore walls, the dispersion force fields exerted by individual part of the pore wall surfaces overlap with each other when the pore is narrow enough (Gregg and Sing 1982;Nguyen and Do 1999). Thus, the superposition of the interaction force fields from the pore walls enhances the potential energies for adsorption of molecules in the molecular dimension pores (Gregg and Sing 1982;Cheng et al 2012).…”

“…As sorbate molecules adsorbed in the pore interior interact with all the surrounding pore walls, the dispersion force fields exerted by individual part of the pore wall surfaces overlap with each other when the pore is narrow enough (Gregg and Sing 1982;Nguyen and Do 1999). Thus, the superposition of the interaction force fields from the pore walls enhances the potential energies for adsorption of molecules in the molecular dimension pores (Gregg and Sing 1982;Cheng et al 2012). Such enhancement is affected by the ratio of the pore size to the diameter of the sorbate molecules, and the adsorption potentials in pores with sizes that are three to six times of the sorbate molecules are notably enhanced (Gregg and Sing 1982;Hu et al 2012).…”

“…Thus, the superposition of the interaction force fields from the pore walls enhances the potential energies for adsorption of molecules in the molecular dimension pores (Gregg and Sing 1982;Cheng et al 2012). Such enhancement is affected by the ratio of the pore size to the diameter of the sorbate molecules, and the adsorption potentials in pores with sizes that are three to six times of the sorbate molecules are notably enhanced (Gregg and Sing 1982;Hu et al 2012). The pore size of Y zeolite ranges from 0.74 nm (channels) to 1.2 nm (cages), while the widest molecular dimensions of 2-CP, 2,4-DCP, and 2,4,6-TCP are 0.576, 0.647, and 0.647 nm, respectively.…”