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Table 3

Sorption kinetic parameters (ZXCG dosage: 0.2 g, pH = 4)

Conc(mg/L)qe, exp (mg/g)Pseudo-first-order kinetic model
Pseudo-second-order kinetic model
qe, cal (mg/g)K1 (min–1)R2qe, cal (mg/g)K2 (g/(mg min))R2
10 4.5 0.13 0.025 0.352 4.5 11.86 1.0 
20 9.47 0.15 0.019 0.554 9.46 1.67 1.0 
50 24.18 0.24 0.014 0.248 24.16 0.66 1.0 
100 48.72 6.93 0.013 0.483 48.69 0.0048 1.0 
200 92.2 5.52 0.0086 0.597 93.2 0.015 0.9999 
Conc(mg/L)qe, exp (mg/g)Pseudo-first-order kinetic model
Pseudo-second-order kinetic model
qe, cal (mg/g)K1 (min–1)R2qe, cal (mg/g)K2 (g/(mg min))R2
10 4.5 0.13 0.025 0.352 4.5 11.86 1.0 
20 9.47 0.15 0.019 0.554 9.46 1.67 1.0 
50 24.18 0.24 0.014 0.248 24.16 0.66 1.0 
100 48.72 6.93 0.013 0.483 48.69 0.0048 1.0 
200 92.2 5.52 0.0086 0.597 93.2 0.015 0.9999 

qe, cal represents the amount of metal ions adsorbed on the zeolite NaX by modeling calculation at equilibrium.

qe, exp represents the experimental amount of metal ions adsorbed on the zeolite NaX.

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