Table 1.

Isotherm constants Cd²⁺ adsorption by CHAp surface.

Langmuir	Qmax(mg/g)	195.711
	RL	0.008
	b (mg/L)	0.517
	R2	0.998
Freudlinch	KF(mg/g) (mg/L)−1/2	6.703
	1/n	0.624
	R2	0.981
Tempkin	αT(L/g)	0.292
	bT(J/mol)	62.378
	R2	0.959
Dubinin– Radushkevich	Q (mg/g)	98.924
	E (kJmol−1)	0.106
	ε (mol/J)2	15.550
	R2	0.921