Zirconium-Doped Fungal Sorbents: Preparation, Characterization, Adsorption Isotherm, and Kinetic and Mathematical Modelling Study for Removal of Fluoride

Table 5

Isotherm parameters for the fluoride removal by zirconium-doped fungal biosorbents.

Adsorption isotherm	Penicillium camemberti SIT-CH-1 + zirconium	Aspergillus ficuum SIT-CH-2 + zirconium	Aspergillus terreus SIT-CH-3 + zirconium	Aspergillus flavipes SIT-CH-4 + zirconium
Freundlich isotherm
Slope:	1.19	0.399	1.858	1.038
Intercept:		1.583		0.331
	0.838	2.5	0.538	0.963
	0.635	4.87	0.636	1.393
	0.749	0.97	0.914	0.947
Langmuir isotherm
Slope:	0.89	0.1	0.611	0.426
Intercept:	0.005	0.06	0.036	0.023
(mg g^−1)	216.83	15.85	27.654	43.58
(L mg^−1)	0.0052	0.63	0.059	0.054
	0.659	0.015	0.203	0.156
	0.934	0.388	0.778	0.618
D-R isotherm
Slope: β
Intercept:	3.309	2.92	4.33	3.228
(mg g^−1)	27.375	18.54	76.35	25.23
(kJ mol^−1)	196.52	704.09	230.15	332.41
	0.45	0.517	0.822	0.302
Temkin isotherm
Slope: () (J/mol)	28.743	4.79	65.07	25.62
Intercept:		1.27
(dimensionless)	87.64	524.91	38.71	98.32
(L g^−1)	0.132	1.303	0.222	0.208
	0.505	0.475	0.827	0.555