pseudo first-order
pseudo second-order
Metal Ions
qe,
K1×10-2
R2
qe
K2×10-2
Cu2+
179
0.92
0.94
39.5
0.72
0.983
Pb2+
172.5
0.95
31
0.61
0.985
Table 1: Pseudo - First and second order parameters for the adsorption of Cu(II) and Pb(II) on NH2-MS
Metals
Langmuir constants (NH2-MS)
Freundlich constants (NH2-MS)
Qmax (mg/g)
KL
KF
1/n
Cu(II)
163.16
0.38
0.988
1.4
0.79
0.93
Pb(II)
147.79
0.44
0.989
1.2
0.71
Adsorbent
qm (mg/g)
Ref.
Silica-Activated Carbon
178.5
2
Metal oxide nanoparticles Fe3O4
127.4
3
Rice husk ash
39.87
4
Poly(ethyleneimine)- Functionalized Silica
36.8
21
NH2-MS
This study
Table 3: comparison of the maximum adsorption capacity of heavy metals onto different adsorbents
Tables at a glance
Figures at a glance