. 2016 Sep 9;6:32949. doi: 10.1038/srep32949

Table 1. Langmuir isotherm parameters for PFOA and 3-indole-acetic-acid adsorption on Na⁺-, and HDTMA-montmorillonite at pH 6.0.

Smectite clay	PFOA			IAA
Smectite clay	K_L (L mmol⁻¹)	C_max (mmol kg⁻¹)	R²	K_L (L mmol⁻¹)	C_max (mmol kg⁻¹)	R²
Na⁺-montmorillonite	0.539	8.199	0.987	4.025	4.673	0.899
HDTMA-montmorillonite	11.839	277.312	0.944	8.212	70.005	0.929

The adsorption data were fitted with Langmuir isotherm model: q_e = (K_L × C_max × C_e)/(1 + K_L × C_e); where q_e is the amount of adsorbate adsorbed on mineral surfaces in mmol kg⁻¹, C_e is the equilibrium concentration in mM, K_L is the Langmuir constant, L mmol⁻¹; C_max is sorption capacity in mmol kg⁻¹; R² is the coefficient of determination from the overall regression analysis.

Table 1. Langmuir isotherm parameters for PFOA and 3-indole-acetic-acid adsorption on Na+-, and HDTMA-montmorillonite at pH 6.0.

Table 1. Langmuir isotherm parameters for PFOA and 3-indole-acetic-acid adsorption on Na⁺-, and HDTMA-montmorillonite at pH 6.0.