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Table 1 Isotherm constants of the two-parameter and three-parameter models 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

  Parameters Values R 2
Two-parameter models    
 Langmuir model q m (mg/g) 70.05 0.9276
K L (L/mg) 0.3577
SSE 203.4
RMSE 7.131
 Freundlich model K F [(mg/g)(L/mg)(1/n))] 23.88 0.9901
n (g/L) 2.956
SSE 27.77
RMSE 2.635
Three-parameter models    
 Redlich-Peterson model K RP (L/g) 64.64 0.9613
α RP (L/mg)(1/βRP) 2.011
β RP 0.7487
SSE 108.7
RMSE 5.214
 Sips model K S (L/g)βs 21.76 0.9848
α s (L/mg)(βs) 1.798
β S 0.3806
SSE 40.31
RMSE 3.174