. 2022 May 27;10(6):291. doi: 10.3390/toxics10060291

Table 2.

Kinetic parameters of CrO₄²⁻ and Pb²⁺ onto synthetic allophane derived from pseudo-first order model and pseudo-second order model.

Models	Parameters	Allophane-Cr	Allophane-Pb
Pseudo-first order	$k_{1}$ (h⁻¹)	0.53	70.37
	$q_{e}$ (mg/g)	0.97	174.34
	R²	0.94	0.34
Pseudo-second order	$k_{2}$ (h⁻¹)	1.09	23.24
	$q_{e}$ (mg/g)	0.62	70.38
	R²	0.98	0.65