Thermodynamic parameters for adsorption equilibrium of methylene blue from aqueous solutions with low-cost adsorbents

Mohd Rafatullah, Othman Sulaiman, Rokiah Hashim, Anees Ahmad, Qasimullah Qasimullah

Abstract


The present paper deals with thermodynamic parameters published for the adsorption of methylene blue (MB) on different low-cost adsorbents. The comparison of enthalpy change (ΔH°) and entropy change (ΔS°) clearly divides the adsorbents into two groups, namely, inorganic and natural or lignocellulosic adsorbents. The former group follows the van’t Hoff equation and no compensation effect is required in the computation of enthalpy and entropy changes. On the other hand the second group requires the consideration of compensation effect which is generally overlooked by almost all of the authors.


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