Table 6.

Parameters study of the intraparticle diffusion.

Adsorption of A®IRC-50	[Pb(II)] (mg L−1)	Time (min)	Ki	Xi	R2
Pb(II)	20	< 60	1.98	06.86	0.55
		> 60	0.57	18.7	0.83
	40	< 60	4.10	06.43	0.88
		> 60	0.65	37.67	0.82
	060	< 60	05.70	07.62	0.87
		> 60	0.63	52.71	0.76
	100	< 60	11.90	04.10	0.99
		> 60	0.38	90.72	0.63
	200	< 60	11.52	11.19	0.92
		> 60	0.76	96.75	0.73