Effect of Aging on the Adsorption of Tetracycline by Humic Acid: Insight into the Morphology and Chemical Composition

Table 1

Parameters of the kinetic models for the adsorption of TC by HA and AHA samples.

Models	Parameters	HA	AHA-0.05	AHA-0.1
Pseudo-first-order
	qe,exp/mg·g^-1	2.82	2.48	2.17
	qe,cal/mg·g^-1	1.383	1.274	1.139
	K1/h^-1	0.0005	0.001	0.001
		0.852	0.827	0.831
Pseudo-second-order
	K2/g·mg^-1·h^-1	0.037	0.02	0.02
	qe,cal/mg·g^-1	2.841	2.488	2.197
		0.999	0.999	0.992
	K2q^2e,cal/mg·g^-1·h^-1	0.299	0.125	0.096
Weber and Morris intraparticle diffusion
	Kid1/mg·g^-1·h^-1/2	0.276	0.041	0.039
	I1/mg·g^-1	-0.115	1.493	1.742
		0.944	0.923	—
	Kid2/mg·g^-1·h^-1/2	0.0004	0.0085	0.0860
	I2/mg·g^-1	2.8100	2.0850	1.7830
		0.831	0.650	—
Boyd’s film-diffusion model
	Intercept	-0.702	0.906	0.845
		0.955	0.744	0.648