Metal ion
q
exp
(mmol g
-1
)
Langmuir constants
Freundlich constants
q
e
(mmol g
-1
)
K
L
(l mmol
-1
)
R
2
K
F
(mmol l
-1
)(l g
-1
)
(1/n)
n
R
2
Pb(II)
0.5405
0.5417
14.091
0.980
0.4528
2.9069
0.880
Cd(II)
0.5283
0.5327
12.068
0.998
0.4013
3.1545
0.928
Ni(II)
0.2272
0.2306
6.609
0.999
0.1586
5.1282
0.947
Cu(II)
0.2268
0.2290
20.302
0.999
0.1837
7.6923
0.932
Table 3:
Calculated Langmuir and Freundlich constants and correlation coefficients for the adsorption of Pb(II), Cd (II), Ni(II) and Cu(II) onto COSAC.
