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The adsorption response of eosin Y and indigo carmine acid dyes on activated carbon as a function of system temperature for a fixed concentration was investigated at various temperatures via adsorption isotherms and their thermodynamic quantities such as enthalpy, entropy, and Gibbs free energy changes. The adsorption data were exploited to develop a new adsorption isotherm. The new isotherm was developed with the spirit of solid–liquid phase equilibrium and regular solution theory. Thedoi:10.3390/molecules25246014 pmid:33353187 pmcid:PMC7766678 fatcat:5fwimbp2a5bdbh23mlh7bfp6ty