Biosorptive Removal of Cadmium(II) and Copper(II) Using Microwave-Assisted Thiourea-Modified Sorghum bicolor Agrowaste

Table 2

Kinetic parameters for Cu(II) and Cd(II) biosorption.

Biosorbent	Metal ions	Pseudo-first-order kinetics			qe (mg/g) (experimental)	Pseudo-second-order kinetics
		k1 (min^−1)	R^2	qe (mg/g)		k2 (min^−1)	R^2	qe (mg/g)
SB	Cu(II)	0.147	0.943	1.248	2.17	0.253	0.998	2.277
	Cd(II)	0.154	0.962	1.557	2.12	0.191	0.998	2.252
TSB	Cu(II)	0.187	0.999	0.756	5.02	0.792	0.999	5.076
	Cd(II)	0.271	0.830	4.297	5.40	0.051	0.999	5.19