Table 1.

The adsorption energies of different adsorption capacity within montmorillonite layer.

Adsorption capacity (mmol g${}^{-1}$)	Adsorption energy (eV)	Adsorption capacity (mmol g${}^{-1}$)	Adsorption energy (eV)
0.68	1.27	7.53	− 5.00
1.37	1.50	8.22	− 5.44
2.05	0.67	8.90	− 5.75
2.74	− 0.93	9.59	− 6.35
3.42	− 2.06	10.27	− 6.85
4.11	− 2.45	10.96	− 7.39
4.79	− 2.85	11.64	− 7.90
5.48	− 3.11	12.33	− 8.61
6.16	− 3.60	13.01	− 8.99
6.85	− 4.40	13.70	− 9.37