Table 3.

Thermodynamic parameters for Cr(VI) adsorption.

Temperature (K)	Ke	$\mathrm{\Delta }{\mathrm{G}}^{\circ }$(kJ mol−1)		$\mathrm{\Delta }{\mathrm{H}}^{\circ }$ (KJ/mol)	$\mathrm{\Delta }{\mathrm{S}}^{\circ }$ (J/K mol)
		$\mathrm{\Delta }{\mathrm{G}}^{\circ }=-\mathrm{RT}\mathrm{Ln}{\mathrm{K}}_{\mathrm{e}}$	$\mathrm{\Delta }{\mathrm{G}}^{\circ }=\mathrm{\Delta }{\mathrm{H}}^{\circ }-\mathrm{T}\mathrm{\Delta }{\mathrm{S}}^{\circ }$
298	2.34	− 2.11	− 2.12	13.42	52.18
308	2.38	− 2.66	− 2.64
318	3.28	− 3.14	− 3.16
328	3.88	− 3.69	− 3.68