Adsorbent Ability of Treated Peganum harmala-L Seeds for the Removal of Ni (II) from Aqueous Solutions: Kinetic, Equilibrium and Thermodynamic Studies

Table 1

Kinetic constants for the adsorption of Ni ions on TPHS.

Kinetic model	Parameters	TPHS
Pseudo-first-order	𝑞𝑒 (cal) (mg/g)	137.783
	𝑞𝑒 (exp) (mg/g)	62.740
	𝐾1 (1/min)	0.044
	𝑅^2	0.842
Pseudo-second-order	𝑞𝑒 (cal) (mg/g)	137.783
	𝑞𝑒 (exp) (mg/g)	133.33
	𝐾2 (g/mg·min)	0.004
	𝑅^2	0.997
Intraparticle mass transfer	𝑘𝑑 (mg/g·min)	11.884
	𝐶 (mg/g)	47.402
	𝑅^2	0.683