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

Table 3 Kinetic model constants and correlation coefficients for adsorption of IDB onto LDHs and CLDHs adsorbent, C_i = 100 mg L^− 1

Adsorbent	q_exp (mg g^− 1)	Pseudo-first order			Pseudo-second order			Intraparticle diffusion rate
Adsorbent	q_exp (mg g^− 1)	k₁ (min^− 1)	q_e, (cal) (mg g^− 1)	R²	k₂ × 10⁻⁴ (g mg^− 1 min^− 1)	q_e, _cal (mg g^− 1)	R²	k_p (g mg^− 1 h^0.5)	R²
LDH21	63.5	0.010	22.7	0.595	3.435	66.7	0.996	1.43	0.767
LDH22	83.7	0.008	33.6	0.599	2.441	83.3	0.995	2.01	0.767
CLDH21	99.3	0.013	25.8	0.592	3.378	100	0.998	1.93	0.756
CLDH22	99.7	0.012	24.0	0.591	4.049	100	0.998	1.68	0.765

k₁ is the pseudo-first order adsorption rate constant (min⁻¹) and k₂ is the pseudo-second order adsorption rate constant (g mg^− 1 min^− 1)

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