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. 2016 Dec 27;9(1):5. doi: 10.3390/polym9010005

Table 4.

Adsorption kinetics constants for Cu2+ adsorbed by different adsorbents.

Model Coefficient S-1 S-2 S-3 S-4
Pseudo-first K1 0.040 0.028 0.113 0.057
qe 0.57 0.72 0.97 1.31
R2 0.9985 0.9967 0.9970 0.9886
Pseudo-second K2 0.087 0.042 0.523 0.121
qe 0.62 0.81 0.98 1.34
R2 0.9970 0.9886 0.9991 0.9953