Equilibrium Isotherms, Kinetics, and Thermodynamic Mechanisms of a Novel Polyacrylamide-Strychnos potatorum Seed-Derived Activated Carbon Composite for Aqueous Hardness Removal

Table 3

Kinetic parameters of PA-ACSPC.

			Ca	Mg	Hardness
Kinetic parameters	Pseudo-first-order kinetic model	q e (mg/g)	13.680	14.825	91.897
		K1,ads (min^−1)	0.039	0.0190	0.0216
		R ^2	0.906	0.926	0.902
		SEE	0.154	0.0836	0.0948
	Pseudo-second-order kinetic model	q e (mg/g)	20.781	20.525	131.106
		K t	0.0035	0.000865	0.000249
		R ^2	0.997	0.975	0.989
		SEE	0.156	0.481	0.0483