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Table 7

Kinetic parameters in the adsorption of Cu2+ and Cr (VI) onto HMNZ (pH = 5, adsorbent dose = 1 g, temperature = 298 K, initial concentration of Cu2+ = 50 (mg) and initial concentration of Cr (VI) = 20 (mg))

Adsorbateqexperimental (mmol)First-order
Second-order
k1()qe (mmol)R2k2 (g)qe (mmol)H (mg)R2
Cu2+ 0.040 0.0506 0.032 0.924 0.0196 0.040 0.133 0.954 
  SE = 0.014 SE = 0.161  SE = 1.027 SE = 0.175   
Cr (VI) 0.0066 0.084 0.0062 0.847 0.178 0.0067 0.110 0.910 
  SE = 0.02 0.028  SE = 1.863 SE = 0.026   
Adsorbateqexperimental (mmol)First-order
Second-order
k1()qe (mmol)R2k2 (g)qe (mmol)H (mg)R2
Cu2+ 0.040 0.0506 0.032 0.924 0.0196 0.040 0.133 0.954 
  SE = 0.014 SE = 0.161  SE = 1.027 SE = 0.175   
Cr (VI) 0.0066 0.084 0.0062 0.847 0.178 0.0067 0.110 0.910 
  SE = 0.02 0.028  SE = 1.863 SE = 0.026   
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