Table 1. Parameters of pseudo-first-order, pseudo-second-order & intro-particle diffusion model of adsorption kinetics of arsenic on ICS-ENF.

[NaNO3]	Pseudo-first-order			Pseudo-second-order			Particle diffusion model
	qe (mg/g)	k1 (min−1)	R2	qe (mg/g)	k2 (g/(mg min))	R2	Kp (mg/(g min0.5))	R2
0 mM	0.860	0.047	0.992	1.026	0.052	0.994	0.111	0.992
0.1 mM	0.706	0.022	0.968	0.806	0.035	0.986	0.063	0.992
0.5 mM	0.507	0.013	0.982	0.616	0.023	0.993	0.034	0.991