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Thermodynamics and adsorption studies of rhodamine-b dye onto organoclay

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Research Paper 01/01/2017
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Thermodynamics and adsorption studies of rhodamine-b dye onto organoclay

Hassan A. EL-Adawy, Elsayed M. Elnaggar
J. Bio. Env. Sci.10( 1), 1-10, January 2017.
Certificate: JBES 2017 [Generate Certificate]
Key: EquilibriumKineticsOrganoclayRhodamine-B adsorptionThermodynamic

Abstract

Thermodynamics and adsorption studies were conducted with a dye of Rhoda mine-B (RB) on organoclay (OC). Adsorption of the dye was investigated with an initial dye concentration at pH 7±0.3, 298, 308 and 318 K. The adsorption experiments were carried out isothermally at three different temperatures. The Langmuir and Freundlich isotherm models were used to describe the equilibrium data and the results were discussed in details. The thermodynamic parameters such as standard free energy (∆G°), entropy change (∆S°) and enthalpy (∆H°) were calculated for OC. These values showed that adsorption of RB on OC was a spontaneous and endothermic process.

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