Phragmites karka as a Biosorbent for the Removal of Mercury Metal Ions from Aqueous Solution: Effect of Modification

Table 1

Parameters of pseudo-first-order and pseudo-second-order kinetic models for the biosorption of mercury ions on the surface of natural P. karka and treated P. karka.

Biosorbent type	(mg/g)	Pseudo-first-order kinetics			Pseudo-second-order kinetics
		(mg/g)	(min^−1)		(mg/g)	(g mg^−1 min^−1)
Natural P. karka	0.436	0.079	−0.0308	0.502	0.453	0.65	0.994
Treated P. karka	0.454	0.013	−0.0283	0.972	0.456	7.47	0.999