Removal of Isolan Dark Blue 2SGL-01 from aqueous solutions onto calcined and uncalcined (Mg-Zn)/(Al-Fe)-(CO3)/Cl layered double hydroxides

Table 4 Langmuir and Freundlich’s parameters for IDB adsorption onto LDHs and CLDHs adsorbent

Adsorbent	q_max (exp) (mg g^− 1)	Langmuir parameters				Freundlich parameters
Adsorbent	q_max (exp) (mg g^− 1)	q_max (cal) (mg g^− 1)	R_L	b_L (L mg^− 1)	R²	k_F	1/n	R²
LDH21	75	74	0.016–0.118	0.30	0.992	32.5	0.18	0.951
LDH22	91	90	0.011–0.082	0.445	0.992	36.6	0.21	0.904
CLDH21	427	427	0.005–0.049	0.195	0.999	150.5	0.19	0.793
CLDH22	530	529	0.006–0.069	0.135	0.999	162.4	0.21	0.869

b_L is the Langmuir adsorption constant (L mg⁻¹). k_F is a roughly indicator of the adsorption capacity and 1/n is the adsorption intensity

ISSN: 2468-2039