Table 1.

Kinetic parameters of Cu(II) ions removal on kraft lignin for the initial concentrations 25, 50, 75 and 100 mg/dm³

Parameters	Cu(II) ions concentration
	25 mg/dm3	50 mg/dm3	75 mg/dm3	100 mg/dm3
PFO
q e,exp	6.21	14.49	18.70	24.93
q 1,cal	0.11	0.09	0.06	0.05
k 1	0.023	0.019	0.014	0.013
t 1/2	0.211	0.203	0.248	0.258
R 2	0.6923	0.9829	0.9429	0.8994
PSO
q 2,cal	6.23	12.49	18.71	24.96
k 2	1.198	0.852	1.200	1.309
h	46.510	132.999	420.222	815.470
t 1/2	0.192	0.068	0.064	0.052
R 2	1.0000	1.0000	1.0000	1.0000
IPD
k i1	0.02	0.02	0.06	0.006
k i3	0.008	0.01	0.007	0.004
k i3	0.004	0.004	0.004	0.004
R i,1 2	0.9791	0.6157	0.9442	0.9213
R i,3 2	0.9508	0.9782	0.9535	0.8997
R i,3 2	1.0000	1.0000	1.0000	1.0000
Elovich
A	7.35	4.63	3.35	2.31
B	53.82	37.94	55.20	71.17
R 2	0.9992	0. 9992	0.9768	0.8692