Biosorption of Pb2+, Cd2+ and Zn2+ from aqueous solutions by Agrobacterium tumefaciens S12 isolated from acid mine drainage

Table 1 Adsorption kinetic parameters of A. tumefaciens S12 for Pb²⁺, Cd²⁺ and Zn²⁺

Metal ions	C₀ (mg L⁻¹)	q_e,exp (mg g⁻¹)	Pseudo-first-order			Pseudo-second-order
Metal ions	C₀ (mg L⁻¹)	q_e,exp (mg g⁻¹)	k₁	q_e (mg g⁻¹)	r²	k₂	q_e (mg g⁻¹)	r²
Pb²⁺	25	108	0.14	106	0.9778	0.0019	114	0.9982
	50	182	0.15	175	0.9561	0.0012	188	0.9916
	100	222	0.15	213	0.9622	0.0009	230	0.9911
Cd²⁺	10	17	0.18	17	0.9671	0.0166	18	0.9910
	50	50	0.16	49	0.9675	0.0047	52	0.9932
	75	53	0.14	52	0.9676	0.0039	56	0.9948
Zn²⁺	10	13	0.11	13	0.9549	0.0106	15	0.9911
	50	40	0.16	38	0.9389	0.0059	41	0.9833
	75	46	0.17	44	0.9479	0.0054	47	0.9859

ISSN: 2468-2039