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

Table 1

Kinetics parameters for Cr(VI) biosorption on Grewia spp. biopolymer.

Initial pH of the solution	First-order model				Second-order model
	qe,exp (mg/g)	k1 (min^−1)	qe,cal (mg/g)	R^2	k2 (g·mg^−1·min^−1)	qe,cal (mg/g)	R^2
2	10.268	0.1879	10.478	0.9875	0.0041	14.285	0.9963
4	11.803	0.1847	10.974	0.9941	0.0063	14.598	0.9973
6	11.159	0.1828	11.652	0.9836	0.0030	16.667	0.9107
8	9.374	0.1601	9.815	0.9813	0.0035	13.605	0.9796