Intra-particle diffusion model

	Single component system			Multi-component system
Metal	R²	A	k_id(mgg^-1 min^-1(1/2))	R²	a	k_id(mgg^-1 min^-1(1/2))
Lead	0.14	0.0052	87.82	0.38	0.0128	92.34
Cadmium	0.72	0.0057	86.80	0.04	0.0050	74.56
Copper	0.72	0.0159	67.87	0.51	0.0232	73.90

Table 4: Intra-particle diffusion model parameters for the adsorption of Pb (II), Cd (II) and Cu (II) on raw wheat straw in single and multi-component system.

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