Table 2. Kinetic Variables for Basic Brown 1 (BB₁) and Basic Orange 2 (BO₂) Dye Adsorption on Fe₃O₄-Impregnated C. bonplandianus Biochar.

isotherm	equation	dye	parameters	value
pseudo-first-order	In(qe – qt) = In qe–k1t	BB1	k1 (min–1)	–0.0003
			qe (mg/g)	1.69443
			R2	0.64507
		BO2	k1 (min–1)	–0.00045
			qe (mg/g)	2.31989
			R2	0.56228
pseudo-second-order	t/qt = 1/k2qe + t/qe	BB1	K2 (g/mg min)	0.03915
			qe (mg/g)	7.30833
			R2	0.99378
		BO2	K2 (g/mg min)	0.030523
			qe (mg/g)	7.689941
			R2	0.98971