Table 1.

Kinetic parameters for phosphate adsorption onto HNT and 1Fe-HNT.

Kinetic models	Sorbents
	Raw HNT	1Fe-HNT
qe,exp (mg.g−1)	1.32	2.10
Pseudo-first order
qe,calc (mg.g−1)	1.13	0.14
k1 (min−1)	0.0691	0.0299
R 2	0.906	0.967
Pseudo-second order
qe,calc (mg.g−1)	1.31	2.10
k2 (g.mg−1.min−1)	0.174	0.107
R 2	0.995	0.997
Intra-particle diffusion
kp (mg.g.min0.5)	0.0290
C	0.874
R 2	0.980
kp1 (mg.g.min0.5)		0.0959
C 1		1.15
R 2		0.988
kp2 (mg.g.min0.5)		0.0465
C 2		1.40
R 2		0.986