Table 2.

Coefficient of determination (R²) and standard error of estimate (SEE) of kinetic models for sulfathiazole adsorption onto conocarpus tree waste derived biochar (BC), chitosan-BC beads (CBC), and magnetic chitosan-BC beads (CBC-Fe).

Adsorbent		BC	CBC	CBC-Fe
First order	R2	0.51	0.62	0.67
	SEE	0.026	0.017	0.026
Second order	R2	0.09	0.18	0.16
	SEE	3.1 × 10−3	0.114	5.8 × 10−3
Pseudo-first order	R2	0.71	0.75	0.83
	SEE	0.026	0.017	0.052
Pseudo-second order	R2	0.99	0.99	0.99
	SEE	0.029	0.003	0.015
Elovich	R2	0.98	0.90	0.98
	SEE	1.2 × 10−4	8.1 × 10−5	5.3 × 10−3
Intraparticle diffusion	R2	0.75	0.84	0.88
	SEE	4.8 × 10−4	7.3 × 10−4	1.7 × 10−3
Power function	R2	0.83	0.95	0.82
	SEE	3.2 × 10−4	7.0 × 10−4	2.5 × 10−4