Mass of adsorbent/conc. of Cr (III) ions	30˚C	40˚C	50˚C	60˚C
Mass of adsorbent/conc. of Cr (III) ions	ΔG (kJ/mol)
1 g, 0.1 M	−0.806	−0.42	−0.1	0.44
1.5 g, 0.1 M	−1.23	−0.94	−0.42	0
2 g, 0.1 M	−1.56	−1.38	−0.86	−0.34
1 g, 0.2 M	−1.56	−1.38	−1.15	−0.89
1.5 g, 0.2 M	−1.84	−1.61	−1.37	−1.08
2 g, 0.2 M	−2.07	−1.85	−1.56	−1.36
1 g, 0.3 M	−2.22	−2.08	−1.93	−1.74
1.5 g, 0.3 M	−2.42	−2.21	−2.07	−1.91
2 g, 0.3 M	−2.59	−2.37	−2.2	−2.1