The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Table 1

Adsorption capacity of Cr(VI) by modified clays with surfactants.

No.	Surfactant	Clay	qe (mg g^-1)	Modeling of the adsorption process	Reference
1	HDTMA	Montmorillonite	6.54	Pseudo-second-order model; Langmuir model; Exothermic adsorption	Hu and Luo [37]
2	HDTMA	Zeolite	337.77	Pseudo-second-order model; Dubinin–Radushkevich model; Endothermic adsorption	Ghasemi et al. [22]
3	HDTMA	Bentonite	270.30	Pseudo-second-order model; Freundlich model	Slimani et al. [54]
4	HDTMA	Bentonite	41.90	Langmuir model	Ramos et al. [55]
5	CPC	Montmorillonite	42.44	Pseudo-second-order model; Freundlich model; Exothermic adsorption	Zou et al. [23]
6	CPC	Montmorillonite	47.83	Pseudo-second-order model; Langmuir model; Endothermic adsorption	Liu et al. [24]
7	HDTMA	Bentonite	46.03	Pseudo-second-order model; Freundlich model; Endothermic adsorption	This study
8	CPC	Bentonite	45.55	Pseudo-second-order model; Freundlich model; Endothermic adsorption	This study