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Table 4 Thermodynamic parameters for dye adsorption onto P and AP

From: Alginate-coated perlite beads for the efficient removal of methylene blue, malachite green, and methyl violet from aqueous solutions: kinetic, thermodynamic, and equilibrium studies

Adsorbent   ΔS o ΔH o ΔG o R 2
Dye    T = 298.15 K T = 308.15 K T = 318.15 K T = 328.15 K
AP MB −3.5 −18,427 −17,382 −17,347 − 17,312 − 17,277 0.997
AP MG 117 17,152 −17,844 −19,017 −20,191 −21,365 0.993
AP MV 107 12,531 −19,329 −20,397 −21,466 −22,534 0.996
P MB −74 −42,143 −20,052 −19,311 −18,570 − 17,829 0.989
P MG 164 27,277 −21,665 − 23,306 − 24,948 −26,589 0.990
P MV 116 13,788 −20,782 −21,942 −23,101 −24,261 0.949