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Table 1

Comparison of pseudo-first-order and pseudo-second-order kinetics constants for Mo(VI) removal by S-nZVI particles (initial pH = 7.0, S/Fe molar ratio = 0.5, T = 25 °C)

Initial concentration of Mo(VI) (mg/L)
Initial concentration of S-nZVI (mg/L)
Parameter2050801002005008001,000
Pseudo-first-order reaction kinetics k1 × 10−2 (1/min) 5.95 1.10 0.69 0.430 0.23 2.02 4.440 1.26 
R2 0.970 0.828 0.908 0.90 0.881 0.952 0.898 0.775 
Pseudo-first-order adsorption kinetics k1 × 10−2 (1/min) 7.46 4.83 6.51 6.03 1.60 1.90 3.72 2.61 
qe (mg/g) 16.78 21.12 27.66 21.12 17.25 27.55 6.203 2.705 
R2 0.971 0.957 0.980 0.974 0.742 0.954 0.905 0.798 
Pseudo-second-order adsorption kinetics k2 × 10−2 (g/(mg·min)) 1.86 1.04 1.07 0.87 4.43 1.88 2.88 4.80 
qe (mg/g) 38.17 68.49 81.30 59.52 34.48 66.67 83.33 83.33 
R2 0.999 0.998 0.999 0.999 0.997 0.991 1.000 1.000 
Initial concentration of Mo(VI) (mg/L)
Initial concentration of S-nZVI (mg/L)
Parameter2050801002005008001,000
Pseudo-first-order reaction kinetics k1 × 10−2 (1/min) 5.95 1.10 0.69 0.430 0.23 2.02 4.440 1.26 
R2 0.970 0.828 0.908 0.90 0.881 0.952 0.898 0.775 
Pseudo-first-order adsorption kinetics k1 × 10−2 (1/min) 7.46 4.83 6.51 6.03 1.60 1.90 3.72 2.61 
qe (mg/g) 16.78 21.12 27.66 21.12 17.25 27.55 6.203 2.705 
R2 0.971 0.957 0.980 0.974 0.742 0.954 0.905 0.798 
Pseudo-second-order adsorption kinetics k2 × 10−2 (g/(mg·min)) 1.86 1.04 1.07 0.87 4.43 1.88 2.88 4.80 
qe (mg/g) 38.17 68.49 81.30 59.52 34.48 66.67 83.33 83.33 
R2 0.999 0.998 0.999 0.999 0.997 0.991 1.000 1.000 
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