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http://dx.doi.org/10.14478/ace.2016.1015

Adsorption Thermodynamics, Kinetics and Isosteric Heat of Adsorption of Rhodamin-B onto Granular Activated Carbon  

Lee, Jong Jib (Division of chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.27, no.2, 2016 , pp. 199-204 More about this Journal
Abstract
The adsorption of Rhodamine-B dye using granular activated carbon from aqueous solution was investigated. Adsorption experiments were carried out as a function of the adsorbent dose, pH initial concentration, contact time and temperature. The equilibrium adsorption data showed a good fit to Langmuir isotherm model. Based on the estimated Langmuir separation factor ($R_L$ = 0.0164~0.0314), our adsorption process could be employed as an effective treatment method. The kinetics of adsorption followed the pseudo first order model. Also, the negative values of Gibbs free energy (-4.51~-13.44 kJ/mol) and positive enthalpy (128.97 kJ/mol) indicated that the adsorption was spontaneous and endothermic process. The isosteric heat of adsorption increased with increase in the surface loading indicating lateral interactions between the adsorbed dye molecules.
Keywords
Rhodamine-B; dye adsorption; adsorption; adsorption kinetic; isosteric heat;
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