Grewia spp. Biopolymer as Low-Cost Biosorbent for Hexavalent Chromium Removal

Table 2

Langmuir and Freundlich isotherms parameters for Cr(VI) biosorption on Grewia spp. biopolymer.

Isotherm model	pH 2	pH 4	pH 6	pH 8
Langmuir
Qmax	1.555	1.661	5.258	1.613
b	0.331	0.584	0.240	0.52
R^2	0.9919	0.9969	0.9356	0.9029
Freundlich
kF	1.516	1.441	2.409	3.649
n	2.402	2.738	1.137	0.984
R^2	0.9936	0.9871	0.9967	0.9982