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Table 3 Adsorption kinetic data for the removal of Ni(II) ions by NZVI-CNS

From: Nanoscale zero-valent iron-impregnated agricultural waste as an effective biosorbent for the removal of heavy metal ions from wastewater

Adsorption kinetic model Parameters Values (mg/L)
25 50 75 100 150
Pseudo first-order q e (mg/g) 12.41 24.39 36.13 46.06 66.66
q e, exp (mg/g) 12.47 24.49 36.14 45.95 65.99
k 1 (min−1) 0.1305 0.1221 0.1105 0.1089 0.1019
R 2 0.9941 0.9934 0.991 0.9935 0.9933
SSE 1.654 5.199 13.02 14.52 32.25
RMSE 0.3877 0.6875 1.088 1.149 1.712
Pseudo second-order q e, cal (mg/g) 13.97 27.68 41.56 53.19 77.84
k 2 (g/mg min) 0.0135 0.006159 0.00353 0.00267 0.00164
R 2 0.9912 0.9907 0.99 0.9907 0.9871
SSE 0.9014 3.86 13.63 20.74 62.02
RMSE 0.2863 0.5924 1.113 1.373 2.374
Elovich kinetic model α E mg/(g min) 1.478 2.958 0.272 0.181 0.2491
β E (g/mg) 0.5539 1.128 3.303 4.596 5.872
R 2 0.9378 0.9793 0.962 0.9608 0.9679
SSE 9.666 12.59 51.87 87.75 154.1
RMSE 0.8975 1.07 2.079 2.704 3.742