Sorption Efficiency of a New Sorbent towards Cadmium(II): Methylphosphonic Acid Grafted Polystyrene Resin

Table 1

Models rate constants for Cd(II) sorption kinetics by the functionalized resin.

Models	Parameters	[Cd(II)]0 = 0.5 mmol·L^−1	[Cd(II)]0 = 1.0 mmol·L^−1
First-order rate	𝑞cal. (mg·g^−1)	2.20	12.43
	𝑞exp. (mg·g^−1)	9.02	17.93
	𝑘1 (min^−1)	0.050	0.020
	𝑟	0.800	0.880
Pseudo second-order rate	𝑞cal. (mg·g^−1)	9.09	20.0
	𝑞exp. (mg·g^−1)	9.02	17.93
	𝑘2 (g·mg^−1·min^−1)	1.6442	0.00262
	𝑟	0.999	0.991
Second-order rate	𝑞cal. (mg·g^−1)	0.67	14.37
	𝑞exp. (mg·g^−1)	9.02	17.93
	𝑘3 (g·mg^−1·min^−1)	0.8052	0.05599
	𝑟	0.928	0.901