. 2018 May 22;8(33):18723–18733. doi: 10.1039/c8ra02055h

Intraparticle diffusion model constants and correlation coefficients (R²) for adsorption of Cu(ii), Zn(ii) and Pb(ii) onto the prepared adsorbent PEI-RCSA in single system.

Metal ion	k _p1	C ₁	(R₁)²	k _p2	C ₂	(R₂)²	k _p3	C ₃	(R₃)²
Cu(ii)	11.1663	−2.5237	0.9926	4.7420	53.3013	0.9652	0.9337	101.7898	0.5791^a
Zn(ii)	8.7976	−6.8928	0.9710	3.1432	47.7513	0.9648	0.3008	84.1116	0.7868^a
Pb(ii)	14.3430	7.7793	0.9613	4.9084	73.2949	0.9827	0.5706	134.9911	0.7361^a

These curves were not fitted with intraparticle diffusion model in a perfect way.

Intraparticle diffusion model constants and correlation coefficients (R2) for adsorption of Cu(ii), Zn(ii) and Pb(ii) onto the prepared adsorbent PEI-RCSA in single system.