Chemical Modifications of Cassava Peel as Adsorbent Material for Metals Ions from Wastewater

Table 7

Kinetic parameters inherent to the intraparticle diffusion model for the removal of the metals Cd(II), Pb(II), and Cr(III) by adsorbents M. H₂O₂, M. H₂SO₄, and NaOH.

Adsorbents	Intraparticle diffusion	Cd(II)		Pb(II)	Cr(III)
		Line A	Line B
M. H2O2	(g mg^−1 min^−1/2)	0.0116		−0.0041	0.0183
	(mg g^−1)	2.2346		2.5030	1.9834
		0.5552		0.6676	0.9082
M. H2SO4	(g mg^−1 min^−1/2)	0.0284	−0.0710	0.0086	0.0134
	(mg g^−1)	2.1038	2.6272	2.1815	1.7690
		0.7800	0.6781	0.7094	0.9280
M. NaOH	(g mg^−1 min^−1/2)	−0.0035		0.0049	0.0323
	(mg g^−1)	2.4865		2.2744	1.9919
		0.5127		0.6265	0.8472

: intraparticle diffusion constant; : suggesting the thickness of the boundary layer effect; : coefficient of determination.