Table 3.

Kinetic parameters from intra-particle diffusion model for the adsorption of nickel from nickel sulfate and nickel nitrate solutions.

Ni2+ Salt	Sulfate	Nitrate
ki1 (mg·g−1·min−1/2)	1.020	0.318
Ci1 (mg·g−1)	1.036	2.634
R2	0.952	0.931
ki2 (mg·g−1·min−1/2)	0.023	0.053
Ci2 (mg·g−1)	20.726	7.896
R2	0.243	0.907