Removal of Cadmium (II), Chromium (III), and Lead (II) Heavy Metal Ions from Water by Graft Copolymerization of Acrylonitrile onto Date Palm Fiber Using H₂O₂/Fe⁺⁺ as an Initiator

Table 1

Kinetic constant parameters obtained for heavy metal adsorption on polyamidoxime resin.

Metal	Pseudo-first order						Pseudo-second order			Intraparticle diffusion model
	(mg/L)	exp (mg/g)	(10^-3) (min^-1)	cal (mg/g)		(10^-2) (g/mg·min)	cal (mg/g)	(g/min)		(mg/g·min)	(mg/g)
Lead (II)	70	22.40	41.22	518.8	0.976	0.30	17.95	0.97	0.996	2.262	5.397	0.992
	50	23.90	32.7	226.01	0.976	0.40	27.03	2.91	0.992	1.733	10.521	0.990
	30	13.81	53.19	363.09	0.981	0.24	27.85	1.82	0.990	1.567	2.112	0.979
Chromium (III)	70	19.58	62.87	1659.7	0.880	0.08	32.79	0.898	0.974	2.929	1.631	0.965
	50	16.39	33.85	111.88	0.994	0.93	17.64	2.89	0.995	0.856	9.645	0.986
	30	10.72	29.48	43.58	0.974	0.31	14.47	0.64	0.970	1.259	1.08	0.988
Cadmium (II)	70	16.24	45.14	832.6	0.937	0.399	36.49	0.53	0.947	2.745	3.999	0.983
	50	15.54	53.19	19.13	0.921	1.1	16.86	3.14	0.998	0.808	9.54	0.977
	30	8.92	51.82	72.31	0.924	0.503	11.48	0.66	0.986	0.977	1.662	0.967