. Author manuscript; available in PMC: 2022 Feb 1.

Published in final edited form as: Environ Sci Pollut Res Int. 2020 Oct 2;28(6):6758–6770. doi: 10.1007/s11356-020-10973-z

Table 2.

Parameters and correlation coefficients of adsorption isotherms according to Langmuir and Freundlich

Metal	Sorbents	Langmuir			Sorbents	Freundlich
		Q_max (g/kg)	K_d	r²		1/n	K_f	r²

As	MAC	0.425	4.96E4	0.86	APM	0.64	2.22	0.97

Cd	MAC	0.63	2.0E4	0.88	APM	0.76	4.24	0.98

Hg	MAC	7.97	7.28E4	0.91	APM	0.9	46.76	0.86

Pb	APM	5.98	3.69E4	0.95	MAC	1.08	119.9	0.85

Q_max, binding capacity; K_d, binding affinity; r², correlation coefficients; 1/n, degree of heterogenicity; K_f, Freundlich distribution constant