Functionalized Glutathione on Chitosan-Genipin Cross-Linked Beads Used for the Removal of Trace Metals from Water

Table 3

Kinetic parameters of the pseudo-first-order, the pseudo-second-order, and the internal diffusion models.

	Pseudo-first-order model
	k1 min^−1	qe1mg ⋅ g^−1		R^2
Fe(II)	0.085	60.95		0.976
Cu(II)	0.056	82.27		0.983
	Pseudo-second-order model
	k2 g ⋅ mg^−1 ⋅ min^−1	qe2mg ⋅ g^−1		R^2
Fe(II)	0.6 10^−3	66.67		0.997
Cu(II)	0.12 10^−3	125.00		0.994
	Intraparticle diffusion
	Kidmg ⋅ g^−1 ⋅ min^−1 0.5	Cmg ⋅ g^−1		R^2
	Kid1	Kid2
Fe(II)	4.906	1.344	3.596	0.990	0.991
Cu(II)	6.658	2.484	2.721	0.989	0.936

Experimental condition: volume 50 mL; pH = 5 for Fe(II) and 6 for Cu(II); [Fe(II), Cu(II)] = 100 mgL⁻¹; adsorbent net mass = 0.030 g; temperature = 293°K; contact time = 10 min, during 5 h; shaking rate = 150 rpm.