Table 3.

R² and constant values for the different adsorption isotherm models of Zn(II), Cd(II) and Hg(II) on TLSB.

Materials	Parameters	Langmuir		Freundlich		Temkin		D–R
Zn(II)	R2	0.9956		0.9586		0.8496		0.8995
	Constants	KL	0.2130 L/mg	Kf	47.53 L/g	bt	51.02 J/mol	B	0.029 × 10–8 mol2 J2
		qmax	351.36 mg/g	1/n	0.1121	at	2.15 × 1010 L/g	ε	8.58 kJ/mol
								qmax	251.32 g/mg
Cd(II)	R2	0.9964		0.9662		0.9639		0.9096
	Constants	KL	0.1744 L/mg	Kf	20.09 L/g	bt	35.66 J/mol	B	0.102 × 10–8 mol2 J2
		qmax	465.29 mg/g	1/n	0.2306	at	1.73 × 1010 L/g	ε	10.26 kJ/mol
								qmax	308.09 g/mg
Hg(II)	R2	0.9950		0.8479		0.9089		0.4655
	Constants	KL	0.1996 L/mg	Kf	25.77 L/g	bt	39.07 J/mol	B	0.088 × 10–8 mol2 J2
		qmax	211.02 mg/g	1/n	0.1881	at	5.40 × 1010 L/g	ε	9.67 kJ/mol
								qmax	311.55 g/mg