Kinetic Model for pH Variation Resulted from Interaction of Aqueous Solution Contaminated with Nickel Ions and Cement Kiln Dust

Table 4

Parameters of different semianalytical models for sorption kinetic data of nickel ions-CKD interaction.

Model	Parameter	Co (mg/L)
		200	400
First order	Ξ	0.266	0.143
	Ψ	−0.137	2.345
	Q1	30.71	52.093
	Ѳ	1.800	2.638
	B	0.052	−0.089
	Φ	3.498	−20.470
	R^2	0.894	0.881
	SSE	0.114	1.65
n^th order	Ξ	1.293 ∗ 10^−6	0.143
	Ψ	−1.202	0.940
	Q1	23.546	1117.499
	Ѳ	429.145	109.981
	B	−3.350	−0.078
	Φ	4409.536	−16.058
	N	1.020	8.203
	R^2	0.894	0.834
	SSE	0.114	1.681