Comparative Biosorption Studies of Hexavalent Chromium Ion onto Raw and Modified Palm Branches

Table 2

Langmuir, Freundlich, and Flory-Huggins constants for the uptake of Cr (VI) on the biosorbents.

Adsorbents	Langmuir			Freundlich			Florry-Huggins
	𝑞max (mg/g)	𝐾𝐿 (L/g)	𝑅^2	𝐾𝐹	𝑛	𝑅^2	𝐾FH	𝑛FH	Δ𝐺^0 (kJ/mol)	𝑅^2
PB	25	0.023	0.982	0.230	1.0	0.883	0.018	3.4	−32.2	0.969
COPB	55	0.047	0.988	10	1.3	0.912	0.139	4.0	−31.8	0.978
SOPB	41.7	0.660	0.990	6.3	3.5	0.887	0.103	2.4	−31.7	0.982