Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Table 2

Kinetic parameters of Pd(II) adsorption onto PEI-CSH.

Models	Parameter	Value
PFO	(mg/g)	96.43
	(L/min)	0.0564
		0.966
PSO	(mg/g)	100.10
		0.0008
		8.65
		0.998
Elovich	(mg/g∙min)	27.1856
	(g/mg)	0.0590
		0.976
Intraparticle diffusion
First stage	(mg/g∙min^0.5)	12.0042
	(mg/g)	2.5736
		0.964
Second stage	(mg/g∙min^0.5)	1.3402
	(mg/g)	78.8017
		0.976
Third stage	(mg/g∙min^0.5)	0.1813
	(mg/g)	96.2293
		0.999