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Table 3

Parameters of pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion for the removal of Cd2+ by E. in natura, E. H2O2, E. H2SO4 and E. NaOH

Models/AdsorbentsE. in naturaE. H2O2E. H2SO4E. NaOH
Pseudo-first-order 
K1 (min−1−0.0031 −0.0037 −0.0094 −0.0149 
Qeq(cal.) (mg g−10.5961 0.2209 0.2250 0.2845 
R2 0.914 0.847 0.927 0.853 
Pseudo-second-order 
K2 (g mg−1 min−10.1740 0.1877 −0.3335 0.1584 
Qeq(cal.) (mg g−11.4511 1.9170 1.3777 2.5176 
 R2 0.997 0.997 0.998 1.000 
Elovich 
a (mg g−1 h−11.0891 1.5396 1.1460 1.8762 
b (g mg−10.0596 0.0606 0.0696 0.1202 
R2 0.939 0.642 0.930 0.892 
Qeq(exp.) (mg g−11.3823 1.8133 1.4302 2.3511 
AdsorbentsIntraparticle diffusionLine ALine B
E. in natura Kid (g mg−1 min−1/20.0308   
Ci (mg g−11.0350   
R2 0.905   
E. H2O2 Kid (g mg−1 min−1/20.1069 0.0118  
Ci (mg g−11.2290 1.6776  
R2 0.937 0.735  
E. H2SO4 Kid (g mg−1 min−1/20.0223   
Ci (mg g−11.2505   
R2 0.9594   
E. NaOH Kid (g mg−1 min−1/20.0248   
Ci (mg g−12.1707   
R2 0.971   
Models/AdsorbentsE. in naturaE. H2O2E. H2SO4E. NaOH
Pseudo-first-order 
K1 (min−1−0.0031 −0.0037 −0.0094 −0.0149 
Qeq(cal.) (mg g−10.5961 0.2209 0.2250 0.2845 
R2 0.914 0.847 0.927 0.853 
Pseudo-second-order 
K2 (g mg−1 min−10.1740 0.1877 −0.3335 0.1584 
Qeq(cal.) (mg g−11.4511 1.9170 1.3777 2.5176 
 R2 0.997 0.997 0.998 1.000 
Elovich 
a (mg g−1 h−11.0891 1.5396 1.1460 1.8762 
b (g mg−10.0596 0.0606 0.0696 0.1202 
R2 0.939 0.642 0.930 0.892 
Qeq(exp.) (mg g−11.3823 1.8133 1.4302 2.3511 
AdsorbentsIntraparticle diffusionLine ALine B
E. in natura Kid (g mg−1 min−1/20.0308   
Ci (mg g−11.0350   
R2 0.905   
E. H2O2 Kid (g mg−1 min−1/20.1069 0.0118  
Ci (mg g−11.2290 1.6776  
R2 0.937 0.735  
E. H2SO4 Kid (g mg−1 min−1/20.0223   
Ci (mg g−11.2505   
R2 0.9594   
E. NaOH Kid (g mg−1 min−1/20.0248   
Ci (mg g−12.1707   
R2 0.971   
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