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Table 6 Intra-particle diffusion model, film and pore diffusion values of Na+ ions for natural and treated zeolite material

From: Novel pre-treatment of zeolite materials for the removal of sodium ions: potential materials for coal seam gas co-produced wastewater

Zeolite form Intra-particle diffusion Film diffusion Pore diffusion
k i (mEq/100 g*min1/2) C (mEq/100 g) R 2 D f (cm2/s) D p (cm2/s)
Natural 1.262 1.40 0.99 2.96 × 10−5 5.70 × 10−5
Ca2+ 0.43 4.23 0.82 2.66 × 10−5 5.70 × 10−5
H+ 0.75 6.14 0.98 3.73 × 10−5 5.70 × 10−5
K+ 1.792 7.69 0.93 4.23 × 10−5 3.80 × 10−5
NH4 + 2.37 10.71 0.94 2.01 × 10−4 1.71 × 10−4