. 2018 Dec 15;27(1):9–20. doi: 10.1007/s40199-018-0232-2

Table 2.

Parameters and values of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models and free energy for the adsorption of CUR

Model	Equation	Isotherm constant	CUR
Langmuir	$\frac{C_{e}}{q_{e}} = \frac{C_{e}}{q_{m}} + \frac{1}{k q_{m}}$ (6)	q_m (mg/g)	2.0 × 10³
		k (L/mg)	0.017
		R ²	0.997
Freundlich	log q_e = log K_F + (1/n) log C_e (7)	K_F [(mg/g)/(mg/g)^1/n]	75.85
		1/n	1.88
		R ²	0.945
Temkin	q_e = BlnA + BlnC_e (8)	A (L/mg)	0.025
		B (kJ/mol)	371
		R ²	0.979
Dubinin-Radushkevich	ln q_e = ln q_s − K_ad(ε²) (9) ε = RT ln (1 + 1/C_e) (9.1)	q_s (mg/g)	910
		k_ad (mol²/kJ)	−3.704
		R ²	0.557
Free energy	$E = 1 / \sqrt{(- 2 K_{ad})}$ (10)	E (kJ/mol)	0.367