. 2019 Nov 23;27(2):1870–1887. doi: 10.1007/s11356-019-06845-w

Table 2.

Pseudo-first-order, pseudo-second-order, and intraparticle diffusion model parameters of Pb(II) onto NK and KDK

Adsorbent	Pseudo-first-order model
Adsorbent	q_e(exp) (mg g⁻¹)	k₁ (min⁻¹)	q_e(cal) (mg g⁻¹)	RMSE	R²
NK	17.644	0.04285	16.83	0.5937	0.9907
KDK	39.94	0.07764	37.97	1.396	0.9866
Adsorbent	Pseudo-second-order model
Adsorbent	q_e(exp) (mg g⁻¹)	k₂ (g mg⁻¹ min⁻¹)	q_e(cal) (mg g⁻¹)	RMSE	R²
NK	17.644	0.002779	18.94	0.3954	0.996
KDK	39.94	0.002776	40.87	0.777	0.9962
Adsorbent	Intraparticle diffusion model
Adsorbent	q_e(exp) (mg g⁻¹)	k_id (mg g⁻¹ min^−1/2)	C (mg g⁻¹)	RMSE	R²
NK	17.644	0.99033	3.89881	2.27306	0.916
KDK	39.94	1.86513	14.77	6.16637	0.846