Removal of Indigo Carmine Dye from Aqueous Solution Using Magnesium Hydroxide as an Adsorbent

Table 5

(a) Thermodynamic parameters for adsorption of indigo carmine onto magnesium hydroxide at pH 7. (b) Thermodynamic parameters for adsorption of indigo carmine onto magnesium hydroxide at pH 13.

(a)

Adsorbent	Temperature (K)	(kJ mol^−1)
Magnesium hydroxide	298	4.5497
	313	8.0641
	323	−0.1369
	333	−0.4484

(b)

Adsorbent	Temperature (K)	(kJ mol^−1)
Magnesium hydroxide	298	3.4227
	313	1.3041
	323	1.0203
	333	−2.2029