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Table 8

Isotherm parameters for Cu2+ and Cr (VI) adsorption on HMNZ (temperature: 298 K)

Adsorption models
Cu2+ Langmuir R2 qm (mmolKL (L
0.981 0.068 SE = 0.081 0.0673 SE = 0.087 
Freundlich R2   Kf (mg)/(mg)n 
0.989 2.531 SE = 0.109 0.74 SE = 0.044 
Dubinin–Radushkevich R2 QD (mmolE (kJ
0.925 0.049 SE = 0.081 0.00001 SE = 1.374 
Cr (VI) Langmuir R2 qm (mmolKL (L
0.997 0.0093 SE = 0.032 0.106 SE = 0.457 
Freundlich R2   Kf (mg)/(mg)n 
0.998 0.679 SE = 0.035 0.123 SE = 0.679 
Dubinin–Radushkevich R2 QD (mmolE (kJ
0.912 0.0038 SE = 0.02 0.0000006 SE = 1.247 
Adsorption models
Cu2+ Langmuir R2 qm (mmolKL (L
0.981 0.068 SE = 0.081 0.0673 SE = 0.087 
Freundlich R2   Kf (mg)/(mg)n 
0.989 2.531 SE = 0.109 0.74 SE = 0.044 
Dubinin–Radushkevich R2 QD (mmolE (kJ
0.925 0.049 SE = 0.081 0.00001 SE = 1.374 
Cr (VI) Langmuir R2 qm (mmolKL (L
0.997 0.0093 SE = 0.032 0.106 SE = 0.457 
Freundlich R2   Kf (mg)/(mg)n 
0.998 0.679 SE = 0.035 0.123 SE = 0.679 
Dubinin–Radushkevich R2 QD (mmolE (kJ
0.912 0.0038 SE = 0.02 0.0000006 SE = 1.247 
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